How to call the anchor of the grinder with a tester. The chain calls by the tester

How to check the anchor of the grinder with a tester

When diagnosing and repairing the electric part of the grinder, it is most convenient to use a multifunctional tester (abbreviated name. Multimeter). If such a device is not at hand, then for some checks a screwdriver with an indicator or a bulb with two wires is suitable. During the repair process, the multimeter allows you to measure both voltage and current values, and engine winding resistance. Indicator and light bulb can only be shown the presence or absence of voltage.

Diagnosis of power breakthrough

Perhaps the most common malfunction of the electrical equipment of the grinder is a break in the power of power inside the lining of the power cable. To diagnose and repair such damage, it is enough to disassemble the rear handle of the grinder and check the voltage on the terminals before the circuit breaker. Another way is to disconnect the cable terminals and use the multimeter to check for the breaks of the resistance of each of its veins.

Stator check and rewind

To check the stator of the electric motor of the grinder, it is necessary to disconnect both of its windings from the power circuit, and then measure their resistance with a multimeter in the range of 200 Ohms. On a good winding, the device will show the resistance of about one ohom, and on a faulty (with a cliff). Dozens or hundreds of misses. If the winding is out of order as a result of a short circuit, then the cargo, as a rule, can be seen from the inside of the stator body. It is impossible to check the stator for an interval circuit with an ordinary tester. For this there are special induction devices. The only ways to repair the stator is its replacement or rewind. The second is possible only in the presence of appropriate qualifications, so most often the stator is simply changed.

Diagnosis of the anchor by the tester

Check the anchor of the grinders both on the cliff of windings and their closure on the core. In the first case, the resistance is measured in a circle between the two adjacent plates of the collector located on the Rotor shaft. All values ​​should be the same (within the same ox), and a significant difference indicates a cliff. In the second measurement is made between the radar radio pipeline and the collector plates. To search for inter.Flip circuit, as in the case of a stator, you must use a special device. If a malfunction is detected, it is necessary to decide on how to carry out repairs: rewinding the anchor or its replacement with a new. It is unrealistic to rewind the anchor windings independently without appropriate skills and equipment, and rewinding in the service will cost almost as much as a new anchor. Therefore, the best option for repair is a purchase and independent replacement of the anchor.

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Checking the start and control unit

Diagnosis of electronic components of the grinder is reduced to determining the serviceability of individual blocks, and repair (if there are no skills in radio engineering). To their complete replacement. The smooth starting device can be checked with an ammeter by comparing the current jump with it and without it. For accurate diagnosis of the unit maintenance unit under load, an oscilloscope is required. Although in order to understand whether it is in principle or not, it is enough just to observe the behavior of the grinder at different modes.

Checking coal brushes

In the process, carbon brushes are erased and when the minimum size is reached, they are subject to replacement. The first sign of problems with brushes is uneven sparking ring around the collector with flashes. Some models have round holes with screw lids to replace and check the brushes on the housing. But in most Bulgarians, in order to change them, you have to completely, as during repair, disassemble the body or rear handle.

Diagnosis of the start button and speed regulator

The most common malfunction in the electrics of the grinder is the failure of the start button, which is most often the result of the dust entering it. You can check the operability of the button using a multimeter or indicator screwdriver, freezing the voltage on its output contact. It is usually not subject to repair and is simply replaced by a new. It is even easier to determine the malfunction of the rotation speed regulator: when the wheel rotates, it or changes the number of spindle revolutions or not. If there are no skills in the repair of such devices, then it is easier to buy a new one for a few hundred rubles.

How to check the stator grinder

The introduction of a grinder in everyday life is everywhere, while due to languid operational criteria for often use, the failure failure is a frequent case. The repair of the tool in most cases is to diagnose the abroad of the nodes and their replacement or their restoration measures. If the mechanical breakdowns and the overstated gear production is simply visually located, then to check the anchor and Stator Bulgarians, we need special knowledge, skills and technical devices.

The breakdown of the operation of the electronic part of the grinder is divided into two categories:

• The mechanical breakdown of conductors, which can be found in the supply wires, the inclusion buttons and the contact places of the workplaces. To determine the absence of cliffs, the device of an electrician “multimeter” is used, working in the mode of resistance measurement or an ohmmeter mode. Separately checked what it remains to our client electronic sections: the supply to the electric motor, the connection on the contacts of the stator and rotor windings.
• Electronic breakdown of working coils, which can be found by the darkening of conductors, possibly visually hidden. In the end, check the anchor and Stator The tester will have to do the absence of short.Closed turns on the grinder, which will rarely like more effective, a special device will come in handy for a clear diagnosis.

How Check the stator Bulgarians with the means at hand:

• Stator It has two main breakdowns. This is a break in the conductor or the appearance of short.Closed turns. With all this, a test of a tester, working in the resistance measurement mode of up to 200 Ohms, can only show the absence of breaks with the average resistance indicators that are not required to be different between phase windings.
• The absence of cliffs in the stator windings are determined by any low.Voltage sample: a pair of wires, a battery, a light bulb. But, the presence of a short.Term closing in the chain cannot be revealed by this method, because experienced electricians are inspected experimentally: voltage is supplied to phase coils, while in the center between the poles of the windings the iron ball is laid, which will “look for” the point of electric balance during ordinary windings. The rotation of the ball indicates the absence of a short circuit in the coils, the displacement from the center is the closure in the guides on the reverse side.

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How check Stator of any tool?

Attention this method is dangerous due to the use of the highest voltage and unpredictable movement of the iron ball.

The anchor of the grinder is stronger than other nodes undergoes different electric, mechanical and temperature influences, therefore, specifically, the rotor in most cases is a prerequisite for the refusal of the tool.

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How check Anchor on a grinder with improvised tools:

• The anchor breakdown implies two options for defects: the breakthrough of the conductors on the lamp contacts, the Kutzue Intervy Clouding in one, as it is also called several windings. Tester Electrician working in the resistance measurement mode of up to 200 Ohms allows you to find cliffs and complete vicinating winding (it will demonstrate exorbitantly low resistance), in the mode of measurement of the resistance of the order of 1 MOM, the reliability of the electrical insulation of the working coils to the iron body of the rotor is checked.
• The absence of a pronounced short circuit in windings of the anchor does not disable a one hundred percent of the system, but an overstated heating of the motor appears, a decrease in its revolutions, which over the years will lead to a complete refusal of the motor. Therefore, with any repair of the tool, it is certainly necessary to call the anchor of the grinder not only by the tester, but also check a special device that reveals even insignificant short circuits.

When repairing power tools, you need to correctly be aware of how true check Anchor and stator Bulgarians:

• The tester allows you to determine the resistance of the windings and detect breaks of the conductors, therefore, even compliance with the tabular dimension certificates does not guarantee the performance of the device, but only shows gross mechanical breakdowns.
• Checking short.Closed turns in the coils is carried out by the professional as it is also called home.Made devices that measure the inductance of each working winding, t.To. KZ drops the level of EMF.
• When performing the repair of the tool, it is often that it remains to make our client the windings are intact, alas, there are short short circuits here. The operation of such a tool is dangerous, therefore the question of the rewinding of the stator, rotor, or the substitution of a “punched” detachment will be trained.
• As practice shows that restoration measures (rewinding), even in a repair workshop, does not guarantee the long.Term reliable operation of the device, therefore it is recommended not to take risks, but to install spare parts company.

Rotor malfunctions

In the case of an optimal use mode, the rotor does not wear out. Regulatory work is carried out with the replacement of brushes with their wear. But over time, with strong loads, the stator heats up and the soil is formed. The most common mechanical breakdown is wear or bias of bearings.

The grinder will work, but the plates quickly wear out, and over time the engine breaks. To avoid breakdowns, it is necessary to check the tool and maintain normal service conditions.

Moisture when it hits metal causes rust. The friction force increases, the current strength is required more for work. There is a significant heating of the contact groups, solder, a strong spark appears.

Replacing the anchor independently at home

Practice shows that if it is decided to replace the anchor of the grinder, then it is best to change it along with the supporting bearings and the impeller of engine cooling.

• New anchor Ushm. Must match your model. Intranscents with other models. Unacceptable.
• Takes, wrenches.
• Soft brush and rag to wipe the mechanism.

How to remove the anchor

Replacing the anchor begins with a disassembly of a grinder. The following steps are performed:

The brushes are removed by a screwdriver on both sides. Brushes are extracted.

How to anchor in place

To install the new anchor of the grinder in place, you should take a new part, and then assemble the tool in the reverse order. The follower is as follows:

• A fixation disk is installed on the anchor shaft.
• The bearing is installed by the method.
• A small gear is planted and fixed with a locking ring.
• The anchor is started into the gearbox body, the docking holes are combined.
• Reducer mounting bolts are twisted.
• The anchor with the gearbox is inserted into the grinder body and fixed.
• Brushes besieged to their places, closed with lids.

After performing these actions, the Bulgarian is ready for work. Replacing the anchor is made.

Ancient Sufi wisdom says: “The person who is able to get out with dignity from a difficult situation is Smart. But wise is one who does not fall into such a situation.»Following the rules of operation of household appliances, avoiding overheating of the motor, you can avoid breakdowns and troubles in the operation of the grinder. The content and storage of the tool in cleanliness and dryness will prevent its mechanisms from pollution and oxidation. Timely maintenance of the tool is guaranteed to relieve unpleasant surprises during operation.

How to call the serviceability of the anchor electrode at home

Bulgarian. A power tool that is often used in the household. Sometimes people face situations when even high.Quality models of these devices fail. Most often, this happens due to an anchor breakdown as a result of improper operation. To make sure that it is broken, you need to know how to check the anchor of the grinder with a multimeter.

Bulgarian. A tool that has almost everyone in the house

How to check the stator of the grinder. Causes of a malfunction, devices for verification

The stator is the motionless part of the electric motor designed to create an electromagnetic field in which the rotor rotates (the moving part of the motor). The number of possible causes of the malfunction of the angular grinding machine. The “grinder”. Includes a break or short circuit of the stator winding turns (coil).

Possible reasons

Factors causing the stator failure:

Signs by which you can understand that the stator is faulty:

• The smell of burning insulation appears.
• The case overheats.
• Smoke appears.
• The rotation of the shaft slows down or stops.
• The shaft spontaneously spontaneously spaces, the tool is dramatically gaining maximum speed.

The wires of the winding are covered with a protective layer of insulating varnish. When overheating, it burns out and destroys. This causes a short circuit of the turns. The varnish at the same time makes a specific smell. The closure of only one of the wires completely disables the grinder.

Rules that will help to avoid overheating of the Ushm engine:

• Turn off the device after working at low speeds not immediately, but after about one minute.
• When working under load at low speeds, make frequent breaks.

Often you can avoid replacing a faulty stator by rewinding its winding. The rewinding of the spoiled coil of the stator of the grinder can be done with your own hands, but it is recommended to entrust this work to a specialist.

Dismantling the grinder

How to check the stator angular grinding machine (grinder)? You need to start with disassembling the device. You will need a screwdriver to do the work.

• Remove from the surface on which a disassembly of the grinder will be made, all extra details.
• Remove the working disk.
• Unscrew the screw.
• Unscrew the screws.
• Paste the casing towards the cord.

The stator is located on the outer side of the engine, on top of the rotor. To get the stator first you have to remove the brushes, then remove the gearbox and then stretch the anchor from the grinder after that. The rotor from the stator before checking you need to remove.

Inspection is recommended to be carried out in bright light. First of all, you need to carefully examine the winding and make sure that there are no visible breaks on it.

If the inspection has not revealed the cause of the stator malfunction, then you will need a special device for verification.

Short circuit indicator check

You can detect a shutters of the winding or short circuit in it using an indicator of short.Closed turns (IR). Other names are an interval indicator or indicator of defects in windings of electric machines.

• Power supply;
• Housings with LCD display, nests for connecting accessories;
• Connecting wires;
• Large induction sensor;
• Small induction sensor.

The principle of operation of the indicator is based on inducing an impulse electric motor in the verified winding. In the presence of short.Closed turns, a magnetic field is recorded from a short circuit current flowing on them.

The procedure for checking the stator of the grinder with the Ivvy device:

• Inspect the Interpreter indicator. Make sure that there are no external damage, integrity of the connecting wires and sensors.
• Connect the power supply.
• Press the power button and make sure the device is about.
• If the indicator of the winding defects has been in the cold for a long time, then it needs to be kept at room temperature at least 2 hours.
• Disable Ushm power supply.
• Select from two sensors large or small, depending on the size of the stator.
• If the passport of the corner grinding machine does not indicate the nominal voltage attached to one round of the winding, then it must be determined by the formula: the nominal voltage of the entire coil is divided into the number of turns.
• Turn on the device.
• Install on the indicator the closest to the amplitude of the pulse test voltage that is obtained in the calculation.
• Pressing the sensor to the surface of the winding, sequentially check all the grooves, waiting 3-4 s. If a short circuit is detected, the device will make a sound signal, and an appropriate inscription will appear on the display.
• If short.Closed turns were not detected, then install the following (larger in value) amplitude on the device and make sure that the reserve of insulation of the winding is available.
• Turn off the device.

The indicator of the winding defects can check the state of insulation between the coils of the stator and the rotor, as well as between the stator winding and the grinder body. If there is no way to buy a ready.Made device, then you can make a simpler indicator of short.Closed turns yourself.

Checking a multimeter

You can make sure that the stator can be used using the device. Multimeter. This is a universal measuring device. They can measure several electrical values: voltage, current strength, resistance.

The device consists of a case on which there are a display, a switch and a nest, and two cords with probes (plus and minus).

The minus probe is always connected to the lower nest, and the plus to the middle or upper, depending on the current strength in the test device.

If the device shows a different resistance at some points, then the winding has a short circuit or a break in one of the turns. On the same principle, the stator is checked by an ohmmeter.

Its difference from the multimeter is that this device can only measure the resistance.

Device for checking the anchors and stators of electric machines

Another device with which you can believe the stator of the grinder is a device for verification of anchors and stators of electrical machines PUNS 5. The device has light and sound alarms, allows you to detect an interval closing of windings, break, measure the insulation resistance of the coils.

How to repair anchor at home

A third of the screwdriver of the screwdriver occurs due to the anchor. With everyday intensive mode of operation, malfunctions can occur already in the first six months, for example, with untimely replacement of brushes. With sparing use, the screwdriver will last a year or more.

The anchor can be saved if the balancing is not broken. If during operation of the device an intermittent hum is heard and there is a strong vibration, then this is a violation of balancing. Such an anchor should be replaced. And you can repair the winding and the collector. Small short circuits are eliminated. If a significant part of the winding is damaged, it can be rewound. Worn and severely damaged lamellas to pave, build up or solder. In addition, you should not take on the repair of the anchor if you are uncertain in your capabilities. It is better to replace it or take it to the workshop.

Collector groove

Over time, the collector is formed from the brushes. To get rid of it, you need:

• Protect the collector using incisor cutting incisors, that is, passing incisors. Passing direct cutter
• We also need a reverse cone for centering in the bearing. Make a hole in it up to 8 mm.

Do not forget to clean the rotor from the chips so that there is no closure.

How to rewind the anchor

Before disassemble the anchor, write down or draw the direction of the winding. It can be left or right. To determine it correctly, look at the end of the anchor from the collector. Pour gloves, take sharp nippers or hacksaw for metal. Remove the front parts of the winding. The collector needs to be cleaned, and it is optional to remove. Neatly, without damaging the groove insulators, knock out the rods of the remaining parts of the winding with a hammer and a metal chisel.

Nadfil, without damaging the filler filler, remove the residues of the impregnation. Count the guides in the groove. Calculate the number of turns in the section and measure the diameter of the wire. Draw a diagram. Cut the sleeve from cardboard for insulation and insert them into the grooves.

After winding, weld the conclusions of sections with collector cocks. Now check the winding by the tester and the short circuit indicator. Get the impregnation.

Instructions for impregnation (taking into account the regulator of the number of revolutions)

• After making sure there are no problems, send anchor to the electrical admission to heated for better epoxy resin.
• After warming up, put an anchor on the table under an angle for better spreading on the wires. Drip with resin on the frontal part and slowly twist the anchor. Drip before the adhesive on the opposite frontal part.

At the end of the process, slightly set the collector. Balanced the anchor using dynamic balancing and grinder. Now put it finally on the bearing. It is necessary to clean the grooves between the lamellas and polish the collector. Make a final check for cliffs and closing.

How to change the old gearbox for a new

Bulgarians differ in size, power, manufacturers, but the principle of componing components is the same. The new anchor of the grinder engine is selected strictly in accordance with the model of your tool.

After unscrewing all the mounting bolts of the casing, case and gearbox, we take out the gearbox with an anchor from the case. Usually the gearbox and anchor are firmly attached to each other. To disconnect them, it is necessary to disassemble the gearbox.

Put the new bearing in the gearbox from the rotor side. Screw the plate due to which the impeller was broken. Insert the gear inside the case and make a nut so that it enters the gear grooves. Put on the impeller into the new anchor, insert anchor into the gearbox body. Twist the nut.

How to check the stator of the grinder. Causes of a malfunction, devices for verification

The secret unit testing tools no one ever told you about. Dror Helper

The stator is the motionless part of the electric motor designed to create an electromagnetic field in which the rotor rotates (the moving part of the motor). The number of possible causes of the malfunction of the angular grinding machine. The “grinder”. Includes a break or short circuit of the stator winding turns (coil).

Possible reasons

Factors causing the stator failure:

Signs by which you can understand that the stator is faulty:

• The smell of burning insulation appears.
• The case overheats.
• Smoke appears.
• The rotation of the shaft slows down or stops.
• The shaft spontaneously spontaneously spaces, the tool is dramatically gaining maximum speed.

The wires of the winding are covered with a protective layer of insulating varnish. When overheating, it burns out and destroys. This causes a short circuit of the turns. The varnish at the same time makes a specific smell. The closure of only one of the wires completely disables the grinder.

Rules that will help to avoid overheating of the Ushm engine:

• Turn off the device after working at low speeds not immediately, but after about one minute.
• When working under load at low speeds, make frequent breaks.

Often you can avoid replacing a faulty stator by rewinding its winding. The rewinding of the spoiled coil of the stator of the grinder can be done with your own hands, but it is recommended to entrust this work to a specialist.

Short circuit indicator check

You can detect a shutters of the winding or short circuit in it using an indicator of short.Closed turns (IR). Other names are an interval indicator or indicator of defects in windings of electric machines.

• Power supply;
• Housings with LCD display, nests for connecting accessories;
• Connecting wires;
• Large induction sensor;
• Small induction sensor.

The principle of operation of the indicator is based on inducing an impulse electric motor in the verified winding. In the presence of short.Closed turns, a magnetic field is recorded from a short circuit current flowing on them.

The procedure for checking the stator of the grinder with the Ivvy device:

• Inspect the Interpreter indicator. Make sure that there are no external damage, integrity of the connecting wires and sensors.
• Connect the power supply.
• Press the power button and make sure the device is about.
• If the indicator of the winding defects has been in the cold for a long time, then it needs to be kept at room temperature at least 2 hours.
• Disable Ushm power supply.
• Select from two sensors large or small, depending on the size of the stator.
• If the passport of the corner grinding machine does not indicate the nominal voltage attached to one round of the winding, then it must be determined by the formula: the nominal voltage of the entire coil is divided into the number of turns.
• Turn on the device.
• Install on the indicator the closest to the amplitude of the pulse test voltage that is obtained in the calculation.
• Pressing the sensor to the surface of the winding, sequentially check all the grooves, waiting 3-4 s. If a short circuit is detected, the device will make a sound signal, and an appropriate inscription will appear on the display.
• If short.Closed turns were not detected, then install the following (larger in value) amplitude on the device and make sure that the reserve of insulation of the winding is available.
• Turn off the device.

The indicator of the winding defects can check the state of insulation between the coils of the stator and the rotor, as well as between the stator winding and the grinder body. If there is no way to buy a ready.Made device, then you can make a simpler indicator of short.Closed turns yourself.

Checking a multimeter

You can make sure that the stator can be used using the device. Multimeter. This is a universal measuring device. They can measure several electrical values: voltage, current strength, resistance.

The device consists of a case on which there are a display, a switch and a nest, and two cords with probes (plus and minus).

The minus probe is always connected to the lower nest, and the plus to the middle or upper, depending on the current strength in the test device.

To check the stator Ushm (Bulfur), it is necessary to set the resistance value from 20 to 200 Ohms on the multimeter and alternately bring the probes of the measuring device to the windings. If the resistance is the same everywhere, then the coil is working.

If the device shows a different resistance at some points, then the winding has a short circuit or a break in one of the turns. On the same principle, the stator is checked by an ohmmeter.

Its difference from the multimeter is that this device can only measure the resistance.

Device for checking the anchors and stators of electric machines

Another device with which you can believe the stator of the grinder is a device for verification of anchors and stators of electrical machines PUNS 5. The device has light and sound alarms, allows you to detect an interval closing of windings, break, measure the insulation resistance of the coils.

The device operates in two modes. “Anchor” and “Stator”. Change of mode occurs using a switch. The device is equipped with a convenient device for installing and fixing the engine checked. It consists of two paws attached to the shaft.

The legs move freely along the shaft, which allows you to change the distance between them and check engines of different sizes. Verification is carried out using two probes. For a cliff or short circuit, special red LEDs and sound signal indicate on the stator winding.

Read more the check procedure is described in the instructions for the device.

Conclusion

Carefully check the stator of the angular grinding machine is relatively simple. But you can do this only using special devices. Therefore, if a visual inspection confirmed that the cause of the malfunction of the grinder is a spoiled stature, it is better to carry out further verification and repair in a specialized workshop.

How to check the engine anchor with a multimeter

The anchor of the engine of the grinder is a conductive winding and a magnetic circuit in which the rotation shaft is pressed. He has a lead gear at one end, on the other a collector with lamellas. The magnetic circuit consists of grooves and soft plates covered with varnish for isolation from each other.

In the grooves, according to a special scheme, two anchor winding guides are laid. Each conductor makes up a half of the turns, the ends of which are paired on the lamella. The beginning of the first round and the end of the latter are in one groove, so they are closed to one lamel.

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The reasons for the breakdown

Ushm. Rotor anchor is a detail that is subjected to the greatest loads: temperature, mechanical and electromagnetic. Violations of the operating rules prescribed by the manufacturer leads to a quick failure of this unit. Some factors of such violations are:

• Going beyond the permissible time of continuous work;
• Lack of protection against aggressive media. Dust, sand, dirt, moisture;
• Exceeding the load parameters;
• Mechanical damage;
• Work at the time of voltage drops.

These reasons can lead to the occurrence of the following fault failures:

• Melting insulation (insulating varnish) of contacts or winding as a result of overheating;
• Mechanical damage: scratches, chips, cracks, from contact with foreign particles that fell into the compartment with mobile details;
• A breakdown at the weak points of the winding caused by overload;
• Curvature or violation of the balance of anchor shaft;
• Short circuit or the occurrence of soot on the lamella.

Check the anchor with a multimeter

In order to conduct such a check, you should disassemble the grinder and gain access to the anchor. The multimeter must be put in the range of 200 Ohms, and the probes of the device touch two adjacent lamberries.

We measure measurements on all turns of the winding, if all the readings are the same, then the anchor is serviceable. If the resistance values ​​differ on some round, then there is a malfunction. You should also check the anchor winding body.

Preparing the tool for testing

If during clicking on the start button the grinder does not turn on, and the electric motor does not rotate, then the rotor and the electrostator are checked.

To do this, prepare the workplace, disassemble the grinder, clean it from pollution and perform a visual inspection. After that, you can start calling.

Visual inspection of the breakdown

Any, even the highest quality tool, is subject to breakdown. Especially if it is intensively exploited. In the case of a breakdown of a grinder, you are unlikely to get a tool on your own. However, a preliminary inspection can be carried out without special skills.

The most commonly anchor fails. Damage can be mechanical. During visual examination, uneven wear of the brushes, as well as their burning, will be visible. In addition, with a faulty anchor, the grinder will vibrate and heat.

There are electric breakdowns. These include:

Such malfunctions can be identified using special measuring devices, for example, multimeter.

Dismantling Ushm

In order to test the anchor or stator by a multimeter, the grinder will need to be disassembled. Before starting work, you need to study the factory assembly scheme of Ushm. It is important not to spoil the design of the grinder due to improper actions, and you also need to choose the correct configuration of the screwdriver to unscrew the screws, otherwise they will have to be dispersed.

In different modifications of the grinder, fasteners are used of different lengths, so you need to fix the locations of the screws. It is better to make a photo of a showdown on a smartphone.

The anchor is made of winding and magnetic circuit. A slotting gear is located at one end, and on the other. A collector. The magnetic circuit is made of soft plates with grooves protected by a special insulating layer.

There are 2 rotor windings in the grooves, each represents half the turns, the edges of which are united in pairs in the lamella. In the 1st border is: the beginning of the 1st and the end of the last, closing on one lamel.

How to check the serviceability and perform repair of the anchor of the grinder with your own hands, step.By.Step instructions, video

As Shakespeare said: “Nothing forever under the moon”. Household appliances, alas, is not an exception. It happens that even the most reliable mechanism fails. And one must be ready to meet this fact without panic, with firm confidence that there are no hopeless situations.

How a grinder is arranged, what malfunctions can be, how to check the anchor of the electric motor, determine the cause of the breakdown and eliminate the problems? Knowing the device of the main components of the power tool will allow the master with their own hands to diagnose and repair the angular grinding machine.

Features of the asynchronous engine of the Bulgarian

In almost all electrical appliances used in everyday life, an asynchronous electric engine is used. An important advantage of this type of motor is that when the load on it changes, the speed does not change.

This means that if, for example, for a long and without stopping, cut a stone with a household grinder, no external signs of engine overload will be noticeably. The speed of the disk rotation will be constant, the sound is plain.

Only the temperature will change, but this can not be noticed if the hands are dressed in gloves.

The collector of the asynchronous engine is sensitive to overheating

With an inattentive attitude, the advantage may turn into a lack. Asynchronous engines are very sensitive to overheating, a significant excess of operating temperature entails melting insulation on the winding windings.

Initially, the motor will work with interruptions, and then. When an interval short circuit will occur. The engine will stop completely. It is worthwhile several times to overheat the engine of the grinder and, most likely, the anchor will melt.

In addition, contacts connecting the wires of the primary winding with the collector are soldered from high temperature, which leads to an interruption of electric current supply.

How to determine the malfunction of the armor of the grinder

Signs of breakdown of the anchor of the grinder are: increased sparking of brushes on the motor collector, vibration of the motor at low speeds, rotation of the working shaft in different directions. If such symptoms are present, the work should be stopped by the tool. This is dangerous. Suspicions are easy to check with simple tests.

Visual examination outside

The search for a malfunction should start with a visual inspection of the grinder:

• Carry out a general inspection of the instrument.
• Pay attention to the integrity of the network cord, the presence of voltage in the outlet.
• Using the voltage indicator, make sure that the current enters the engine collector and start button.

The indicator check the integrity of the electrical circuit

Inspection from the inside

If everything is in order with food, but the grinder does not work, you have to open the body to access the motor. As a rule, disassembly is not difficult. But it is necessary to adhere to simple rules that will avoid trouble during the reverse assembly:

• Be sure to turn off the device from the network before disassembly.
• Remove a working disk and a protective casing from a spindle.
• Open the case in a well.Lit place, on the clean surface of the table.
• Remember the location of all parts and nodes before disassembly. It is recommended to draw or photograph the internal device of the device.
• Screws and fastening screws fold in a separate place so that they do not get lost.

It is best to inspect the motor under bright lighting, so that all small details are clearly distinguishable. The anchor should rotate around its axis freely, the correctly working bearings should not make a sound when working.

There should be no traces of the melted wiring on the anchor, the winding of the circuit should be whole, without breaks. You can smell the rotor. With inter.Flip circuit, insulating varnish burns out and issues a stable specific smell.

But for such a diagnosis, a certain experience is needed.

The chain calls by the tester

If the visual inspection has not given obvious results, it is recommended to continue the examination using a multimeter.

Having set the switching switch of the modes to the Ommeter position (200 Ohms range), it is necessary to “call” two neighboring lamellas of anchors with two probes. If the resistance on all turns is the same, this means that the windings are working.

If on some pairs a tester shows another resistance or a chain break, a malfunction in this coil.

A multimeter in the mode of resistance measurement mode check the integrity of the coils

Gap of wiring can occur between the winding and the core. Carefully examine the places of connection of the coils with the collector lamps in the bottom of the anchor, visually check the contact rations.

Checking contacts with a light bulb

If there is no tester, you can get out of the position using a simple 12 volt light bulb. Power can be any, optimally 30–40 watts.

The voltage from the battery of 12 volts must be supplied to the fork of the grinder, inserting a light bulb into a rupture of one wire. With good anchor, if you rotate the spindle with your hand, the light should burn, without changing brightness.

If the intensity changes, this is a sure sign of interitral short circuit.

If the light does not burn, then this may indicate the following:

• It is possible to freeze the brushes in a non.Working position. A retaining spring worked.
• There was a breakup of the supply circuit.
• There was a short circuit or rupture in the stator winding.

There are other diagnostic methods, but they require more complex equipment that is usually not used at home. An experienced master will determine a breakdown with a high degree of accuracy using a “punch” or a simple transformer with a cut.Cut thoroidal core and one primary winding.

In what cases can you save the anchor and restore it with your own hands

If damage to the anchor is established with guaranteed accuracy, the part must be removed from the electric motor. The disassembly of the motor must be done with special accuracy, having previously removed the brushes and disconnecting the power terminals. The rotor is removed along with the supporting bearings and the impeller of the engine cooling, they make up a single whole with it.

Checking, calling the anchor of the grinder with your own hands

Rotor for Ushm-2300M intercol, Hammer. Photo 220 volts

When failing, the grinder is performed Diagnostics to identify causes. One of them can be Achor breakdown (rotor) electric drive. Perform a check of service/malfunction of this rotating node You can independently. It is necessary to have only in the arsenal Simple vocation devices electric circuit.

Device

For competent diagnosis of anchor failure It is important to know the device and the principle of its operation. The main elements of the anchor are Round core, consisting of a set of plates of electrical steel and a winding hung in its grooves in a certain way. In each of the grooves, according to a special scheme, they are laid Two anchor windings. The first and last round of one of the windings are in one groove and close to one lamel.

Rotor for Ushm Makita 9069 Max. Photo 220 volts

Core Put on the rotor, rotating under the influence of forces arising in an electromagnetic field formed by the windings of the anchor and working with it in a pair of stator coils. In the grinder, an anchor is a assembly node, with a drive gear located at one end of the shaft, on the opposite. A collector knot.

Causes of malfunctions

The reasons for the rotor can be Incorrect operation power tool, which represented by the following factors:

• The permissible time of continuous operation has been exceeded, which is one of the main reasons for the failure of household Bulgarians;
• Carrying out work in conditions of aggressive environments with the presence of sand, moisture, abrasive dust and other similar materials;
• Work in conditions exceeding the permissible load;
• Some mechanical malfunctions affect the imbalance of a rotating rotor, which ultimately affects the normal functioning of the rotor electrical circuit;
• Network voltage instability during operation by the electric tool.

Wonderful rotor for Bosch Ushm GWS6-100/GWS 850 Max. Photo 220 volts

The operation of the power tool associated with the action of these factors leads to the occurrence of the following faults:

• Cliff of coil conductors;
• Short circuit between turns due to burnt insulation;
• Isolation loses its properties, which can cause a break in the winding to the core body;
• Violation of collector contacts;
• Parts of charred insulating varnish or melted solder that have fallen into the gaps that come into contact with a rotating rotor, can cause mechanical damage to the elements of the grinder: cracks, carcasses, deep scratches.
• The collector’s lamellas wear out unevenly, a short.Circuit is formed on them.

This is mainly happening With prolonged work collector engine of a grinder without a break to rest. The insulation of the winding from heating loses its characteristics, is melted, which leads to a short circuit of the turns. The contacts connecting the anchor winding with the collector lamps can be soldered, the electric current is interrupted and the electric drive stops.

How to check the serviceability, call the Ushm rotor at home, video

In domestic conditions, the following methods for diagnosing the anchor exist:

• Visual inspection;
• Using a multimeter;
• A light bulb and two wiring connected to it;
• Instruments specially created for checks of the integrity of the windings (an indicator of short circuit, an anchor test and others).

Details about the types of diagnostics in the following information where there is a video.

Visual inspection

Even if there is a complete arsenal of devices to check the electric chain of anchor, never Do not neglect visual inspection. The obligatory first step of the entire diagnostic process. A careful look will find signs by which the user who knows the design and principles of the rotor will determine the nature of the malfunctions.

Charred traces and the presence of a specific smell are the cause of burned isolation and ultimately damage to the wires of the winding. Attention should be paid on crumpled or swollen rounds, what can authorize the presence of cliffs in this place. On the windings can be located Particles from solder, which are source of short circuit.

Violations of contacts of windings with the collector can be detected On burnt lamella. Visually diagnosed damage to the collector itself. Raised, worn or charred plates.

Tester, multimeter

Device Multimeter or its other name tester To measure electrical parameters: current strength, voltage, resistance. Can be used to search for cliffs of wires of windings or breakdown on the core body.

In the next video, the author offers a diagnostic option from simple to complex. With the help of the multimeter, the stator is primarily nicknamed. It is much easier to perform a check than the rotor. If there are no cliffs and breaks on the body on the status, then we can conclude about the anchor malfunction. Further, its diagnosis should be carried out in more detail with the determination of the exact type of defect and determining the method of elimination. A multimeter is carried out in the “Resistance Verification” mode with the installed minimum measurement scale (up to 200 Ohms).

This video, as in the other, shows the process of determining cliffs of windings, which is really quite laborious, since measurements are carried out between each pair of lamellas along the entire contour of the collector. At the same time, on the anchor that does not have cliffs, all the multimeter readings should not differ from each other within 0.1 ohms. The breakdown of the windings on the case is much easier to check with one probe on the core body, and the other on the collector plates. The multimeter scale should not respond with any testimony.

How to call the anchor multimeter?

To complete this procedure, you will need the measuring electrical appliance and tools to disassemble the device. How to call the anchor with a multimeter. Instructions:

• Prepare the work surface. There should be enough space to arrange the necessary tools and parts removed from the device.
• Carry out disassembling the grinder and take out anchor.
• Clean the part of dirt and dust.
• Using the recommendations in the video presented, you can independently call the anchor with a multimeter.

At the initial stage of diagnosis, the value of the measuring device is set at the mark of 200 kOhm. If your multimeter does not have such a scale, then you can limit yourself to 20 kOhm. To call the anchor, one probe of the measuring device is applied to the mass, and the second touch each of the plates. If any indicators do not appear on the scale of the analog multimeter or the digital screen, most likely there is an interval circuit in the anchor winding. You can accurately diagnose the problem with the help of a special device, which is available to professional locksmiths.

Interpretation of the stator

Often on a faulty engine there is an interval circuit. First check the stator winding for resistance. This is an unreliable method, since the multimeter can not always accurately show the result of measurement. It also depends on the technology of engine rewinding, on old age.

Ticks can also measure resistance and current. Sometimes they check by the sound of a working motor, provided that the bearings are serviceable, lubricated, the drive gearbox is working. They also check the interval circuit with an oscilloscope, but they have a greater cost, not everyone has this device.

Externally inspect the engine. There should not be traces of oil, subtexts, smell. The current.Measured current should be the same. A good tester check the resistance windings. With a difference in measurements of more than 10%, there is a probability of closing the turns of the windings.

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