Winding of the stator of the corner grinder at the factory. Video: replacing brushes in electric drill

Calculation of the cross.section of the wire for winding the stator of the corner grinder. “Rewind email.engines in domestic conditions “. If a smooth start does not work

There is no doubt that every electric tool will stop working sooner or later later. Most often this is due to the fact that operating conditions were not met. Not included in the list of exceptions and angular grinding. If you suddenly have such a nuisance, you can not immediately contact the workshop, but try to figure it out yourself, especially since most of the problems are easily solved.

Problems with an engine of any type can have a mechanical or electrical nature. In the first case, strong vibration and characteristic noise may indicate a malfunction, as a rule, this indicates problems with the bearing (usually in the end cover). If the malfunction is not eliminated in time, the shaft can jam, which will inevitably lead to the failure of the stator windings. In this case, the thermal protection of the circuit breaker may not have time to work.

Based on the practice, in 90%, the failure of asynchronous machines arise problems with the stator winding (cliff, inter.flip circuit, short circuit on the case). In this case, a short.closed anchor, as a rule, remains in working condition. Therefore, even with the mechanical nature of damage, it is necessary to check the electrical part.

Care and proper operation

To maintain the tools of tools and your own health, an angular grinder should be used only for the work for which it is intended. It is worth paying attention to the following rules:

• You can not use any lubricant, any spare parts, except for those recommended by the manufacturer;
• All firms warn in their instructions that it is possible to work with a corner grinder only with good well.being; Even ordinary fatigue, not to mention alcohol or drug intoxication, is a serious danger;
• It is impossible to carry out any work if the protective casing is removed;

• All the time you should control the location of the wire. it should not fall under the cutting or grinding disk;
• Checking the technical condition of the tool should be carried out both before the start of work, and after its completion; It is advisable to inspect the corner grinder also after long (from 1 hour or more) breaks;
• Regardless of the brand and model, it is necessary to disassemble the tool from time to time, cleaning all the pollution from it, updating the grease of the running parts;
• It must be remembered that the corner grinder is not intended for work and even for storage in high humidity conditions;

• It is always necessary to put it so that the tool does not fall by accident, is not subjected to the pressure of heavy objects; It is worth remembering that the cord should not hang;
• It is required to minimize the folding and twisting of the cable;
• It is strictly unacceptable to transfer the corner grinder behind the network wire or pull it up for it;
• the disk and other nozzle are selected strictly for the work that they are going to do;
• when a crack appears, or even single potholes. the circle is subject to immediate replacement; The same should be done with disks that have the wrong shape;

• When the circle is replaced, the launch of 30 seconds in trial mode is carried out; If during this time there are no unusual noise, vibrations or beats, everything is in order;
• You can not leave anything in the working area that can easily light up, talk strongly or explode;
• It should only work in good light on a stable platform (support);
• You can not hold the workpieces in your hands-they are either clamped in a vice or instructed someone to keep with divorce keys.

Important! Compliance with these simple rules avoids injuries and extend the time of use of corner grinding, removing the repair.

About how to repair a corner grinder with your own hands, watch in the next video.

Rewinding of a grinding machine stator

Rewinding the stator of the corner grinder can currently be done independently. To do this, you need to stock up only with the necessary knowledge. If the master has the necessary tools, the skills of carrying out repair work and a certain amount of knowledge in the field of electrical engineering, the question of how to eliminate the malfunction of this tool with your own hands is solved quite easily.

Causes and signs of stator breakdown

Manual grinding machines, popularly called “grips” can fail for various reasons. The most common problem is the torn of the stator turns that occur due to the overly strong load on the apparatus. Now such a malfunction can be corrected independently. correctly rewind the stator.

There are frequent cases when the cause of the breakdown becomes an failure of the electrical part of the device. Various factors lead to this:

• water gets to the surface along which the current passes;
• voltage surges;
• sharp pulling out a fork from a socket;
• high overload and, as a result, overheating.

There is an opinion that it is impossible to rewind the stator yourself. In fact, just understand the design of the device. If there is experience of such work and the necessary knowledge, the repair of a three.phase launch device can be carried out at home. Given the preparatory work, the process can take several hours.

Often the engine fails due to a breakthrough of the magnetic circuit, winding or anchor collector disturbances. With an increase in voltage, an abrupt increase in the force of sparks is noted. This is usually observed only on one brush. This phenomenon leads to the destruction of the insulation of wires on a stator coil. If when turning on, the disk accelerates very quickly and gains momentum, this indicates a vitkov short circuit of the stator.

Sparks arising during the work of the collector signal the occurrence of violations in the balancing of the anchor. Checking the work of the collector can be carried out in this way: when turned on, the sound should be intensified gradually with an increase in voltage. There should not be vibrations. If a resonance is observed, the electric motor of the corner grinder requires repair.

Manual grinding machine device

The grinding tool consists of three important components:

The anchor is a rotating element with the winding and creates the torque of the electric motor. There is the same winding at the stature, divided into sectors. The current through the coal brush passes through the winding, goes to the anchor. Then the current passes to other brushes until all parts of the stator are involved. When an electric current passes through the winding, a magnetic field constantly interacting with the stator arises. Thus, the electric motor is driven. There are several characteristic breakdowns of the starting device for the “corner grinding”::

Circuit of eccentric orbital grinding machine.

You can rewind the winding with your own hands, without contacting a specialist. You just need to first disassemble the device. But if there is no complete self.confidence, then contacting a specialized workshop will be the most reasonable step. First of all, the casing is shifted. To do this, the screw is unscrewed. After that, it will be possible to see all the parts of the corner grinder, with the exception of the gearbox hidden under the metal cap. Screws are unscrewed, with which a metal plate is fixed. Now all mechanical details are clearly visible. Only after that you can proceed to rewind the stator.

It can only be the correct operation in which there will not be a breakdown of a better repair of a well.performed repair. In order for the “corner grinder” to work longer, the following simple rules must be observed:

• In no case do not need to exceed the amount of lubrication and the terms for its addition or replacement.
• After the tool worked at low speeds, it is strictly forbidden to immediately turn it off. If you leave it to work at least 1 minute, you can avoid overheating.
• Do not allow long.term operation of the tool at low speeds under load.

A repaired stator will allow a grinding machine to work normally for a long time.

For rewinding the stator you will need special tools:

• hammers: wooden, metal;
• roundbones and pliers;
• steel brush;
• calipers;
• Megommeter;
• electric drill;
• ruler;
• varnish.

The first and most important stage is to clean the stator from pollution. The old winding is removed from the grooves. All this can be done using a steel brush. Cleaning is carried out manually using steel brushes, electric drifts. It is also necessary to remove the old insulation. To facilitate the task, you can use transformer oil. It must be a little warm and lower the starting device into it. Such a measure will soften the damaged isolation and simplify its removal. For cleaning, a weak caust solution (temperature is 80ºС) mixed with compressed air is also used.

After processing, the stator must be washed well with water and dried. The state of the stator and steel packages must be checked well. Then tighten the hair core, the grooves are cleaned from the burrs. Insulation resistance is measured using a megammeter. Parts of the core, pressure washers and grooves are covered with varnish. Wars and grooves must be isolated.

The accompanying note can facilitate further work, where the main data is displayed:

• phase connection scheme and their number;
• resistance of the coil and phase;
• the number of grooves and their size;
• cross.section of the winding, a step of coils in the grooves;
• The method of insulation of the groove, the number of interlayed gaskets and their dimensions.

Next, the remaining frontal winding is removed and a new. There is a special template for the manufacture of the winding. It is fixed on the axis holding 2 large.sized plate made of metal.

When working, it is important to obtain a strictly defined number of turns. it should be identical to the number of turns of the old winding. The wire must be wound so that the seal is maximum. Coils are placed in the stator. From the same material from which the winding for the coils is made, conclusions are drawn. Their tips need to be isolated by cambrices. tubes made of plastic.

Electric circuit

Knowledge of the appointment of the main parts will not give a 100% positive result in repair. It is also necessary to figure out and understand how the electrical circuit of the corner grinder is arranged and how the electric motor works. Two windings are involved in the diagram, which are sequentially connected through the power wire to the network with a voltage of 220 V and are not interconnected in the electrical circuit. The mechanically installed circuit breaker binds to the power button and disconnecting the grinder. Each of the windings is connected through contacts with graphite brushes. Through brushes, the windings are connected to the rotor collector. It is also very important that the anchor has many windings, however, only two windings are connected to graphite brushes, and the failure most often occurs due to a rupture of the electric circuit. Diagnosis of the electrocope of the device is carried out by a special device. tester. A portable measuring device is used not only in the repair of corner grinders, but also to check other electrical tools and devices.

The correct check should be made from the input power cable with the transition to the sequential elements. When checking conductivity, the multimeter switch is set to the minimum voltage.

Malfunction of the electocepe of the collector motor

Most often, the breakdown in the electrical circuit of the corner grinder occurs for the following reasons:

• Collector wear;
• Breakdown button;
• Wear of coal or graphite brushes;
• Overheating and short circuit in the stator winding;
• Overheating and burning of the rotor winding;
• Damage to the power wire.

Such malfunctions are the most frequent, but there are other breakdowns associated with the break in the electric circuit.

Manual grinding machine device

The grinding tool consists of three important components:

The anchor is a rotating element with the winding and creates the torque of the electric motor. There is the same winding at the stature, divided into sectors. The current through the coal brush passes through the winding, goes to the anchor. Then the current passes to other brushes until all parts of the stator are involved. When an electric current passes through the winding, a magnetic field constantly interacting with the stator arises. Thus, the electric motor is driven. There are several characteristic breakdowns of the starting device for the “corner grinding”::

Circuit of eccentric orbital grinding machine.

You can rewind the winding with your own hands, without contacting a specialist. You just need to first disassemble the device. But if there is no complete self.confidence, then contacting a specialized workshop will be the most reasonable step. First of all, the casing is shifted. To do this, the screw is unscrewed. After that, it will be possible to see all the parts of the corner grinder, with the exception of the gearbox hidden under the metal cap. Screws are unscrewed, with which a metal plate is fixed. Now all mechanical details are clearly visible. Only after that you can proceed to rewind the stator.

It can only be the correct operation in which there will not be a breakdown of a better repair of a well.performed repair. In order for the “corner grinder” to work longer, the following simple rules must be observed:

• In no case do not need to exceed the amount of lubrication and the terms for its addition or replacement.
• After the tool worked at low speeds, it is strictly forbidden to immediately turn it off. If you leave it to work at least 1 minute, you can avoid overheating.
• Do not allow long.term operation of the tool at low speeds under load.

A repaired stator will allow a grinding machine to work normally for a long time.

Preparation for the repair and the necessary tools

For rewinding the stator you will need special tools:

• hammers: wooden, metal;
• roundbones and pliers;
• steel brush;
• calipers;
• Megommeter;
• electric drill;
• ruler;
• varnish.

The first and most important stage is to clean the stator from pollution. The old winding is removed from the grooves. All this can be done using a steel brush. Cleaning is carried out manually using steel brushes, electric drifts. It is also necessary to remove the old insulation. To facilitate the task, you can use transformer oil. It must be a little warm and lower the starting device into it. Such a measure will soften the damaged isolation and simplify its removal. For cleaning, a weak caust solution (temperature is 80ºС) mixed with compressed air is also used.

After processing, the stator must be washed well with water and dried. The state of the stator and steel packages must be checked well. Then tighten the hair core, the grooves are cleaned from the burrs. Insulation resistance is measured using a megammeter. Parts of the core, pressure washers and grooves are covered with varnish. Wars and grooves must be isolated.

The accompanying note can facilitate further work, where the main data is displayed:

• phase connection scheme and their number;
• resistance of the coil and phase;
• the number of grooves and their size;
• cross.section of the winding, a step of coils in the grooves;
• The method of insulation of the groove, the number of interlayed gaskets and their dimensions.

Next, the remaining frontal winding is removed and a new. There is a special template for the manufacture of the winding. It is fixed on the axis holding 2 large.sized plate made of metal.

Winding scheme, how to choose the thickness of the wire

Bulgarian stators have a very similar design and differ in the size of the details in which the magnetic flux is formed, the number of turns into the windings and the diameter of the wire. The standard connection diagram of the Bulgarians is shown in the following figure.

Here L1 and L2 indicate the coils of the stator.

The burned winding is removed, while it is necessary to collect information about the old coils: determine the number of turns, the diameter of the wire, the beginning, end of the winding and the required direction during diverse work. The number of turns is determined by the direct account of the delays after cutting out the coils of the coils.

The diameter of the wire should correspond to the replaced windings as close as possible. Therefore, as a measuring tool, the most suitable is a micrometer with an accuracy of measurement up to 0.01 mm. The measurement is carried out on the surface of the wire of the burned coil on the surface of the surface of the wire.

Necessary tools

Locabulary whole.hand hammer 500 g. Inforce. Photos all tools.RU

• Various hammers: metal, wooden, several sizes.
• For manipulations with coils, pliers, round.liners, pliers are used.
• Stripping the surface surfaces from pollution and isolation is performed using a metal brush.
• The required cleanliness of the surface of the stator can be obtained using an electric drill with appropriate nozzles.
• In addition to a micrometer, a caliper and a ruler are used for less critical measurements.
• Control the electrical parameters of the coils after rewinding can be by multimeter.
• Cambrows, insulating cardboard, bicopic tape special varnish for impregnation. auxiliary materials for repair technology.

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.

If most of the wiring is damaged in the anchor and the balancing is disturbed as a result of overheating, it is better to replace it entirely. Increasing the balancing is indicated by increased vibration and uneven hum when operating the mechanism.

How to rewind the anchor. step.by.step instructions

If the balancing of the anchor is not broken, and the problem is only in spoiled windings, then such an anchor can be restored independently by rewinding the coils. Ringing the rotor at home requires great patience and accuracy.

For independent rewinding of the anchor, you will need:

• New winding wire. Copper core with diameter, exactly corresponding to the old conductor is used;
• dielectric paper for isolation of the winding from the core;
• varnish for pouring coils;
• soldering iron with tin-blue solder and rosin.

Before rewinding, it is important to count the number of turns of the wire in the winding and wind the same amount of new conductor on the coils. The rewinding process consists of the following steps:

The rewinding process consists of the following steps:

• Dismantling of old windings. They must be carefully removed without damaging the metal hull of the anchor. If any burrs or damage were found on the case, they must be made up with a file or sanded. Sometimes, for complete cleaning the body from toxins, the masters prefer to burn it with a burner.
• Preparation of a collector for connecting a new wire. To remove the collector there is no need. Lameli should be examined and measured with a megammeter or multimeter of the resistance of contacts in relation to the body. It should be no more than 0.25 MOM.
• Removing the old wiring on the collector. Thoroughly remove the remains of the wires, cut the grooves in terms of contacts. In the future, the ends of the coil wires will be inserted into the grooves.
• Installation of sleeve for anchor. Sleeves are made of dielectric material 0.3 mm thick, for example, electrical cardboard. Cut a certain amount of sleeves and insert into the grooves of the purified anchor.
• Rewinding coils. The end of the new conductor is soldered to the end of the lamella and wound with successive circular movements, counterclockwise. Such styling is called “laying to the right”. Repeat the winding for all coils. Near the collector, pull the wires with a thick thread from the x/b fabric (it is forbidden to use kapron, as it melts when heated).
• Checking the quality of the winding. At the end of laying all the windings, check the absence of inter.flip circuits and possible breaks with a multimeter.
• Finish processing. The finished coil is treated with varnish or epoxy resin for fastening the winding. In factory conditions, impregnation is dried in special furnaces. At home, this can be done in the oven. As an option. to use rapidly dry varnishes for impregnation, applying a coating in several layers.

Rewinding of the anchor

The process of replacing the collector engine winding is somewhat similar with the exception of small nuances associated with a feature of execution. For example, anchor, not a case, is sent to rewind, provided that the problem did not arise with the coils of excitement. In addition, there are the following differences:

• For winding, a special machine is used, more complex configuration.
• A groove is necessary, balancing the anchor (in the final part of the process), as well as its cleaning and grinding.
• Using a special milling machine, a collector is cut.

For the listed processes, special equipment requires, without it rewinding electric motors. a waste of time.

The causes of breakdowns

408-105 Stator for angular grinder Hitachi G18SE3 and Hammer. Photo 220 volts

The most common reason for the failure of the stator of the corner grinder is a violation of operating conditions. Asynchronous engines have the ability to maintain speed, regardless of the value of the active load. This is both a dignity and a disadvantage.

The ability to perform work at high loads is accompanied by overheating of the tool, which contributes to prolonged operation to the occurrence of malfunctions in the winding and stator windings. Under the influence of high temperature, the protective layer of the insulating coating is burned out, which leads to the failure of electric nodes.

Device for checking the anchors and stators of electronic machines

The next device, of course, believe the stator of the corner grinder is a device for verifying the anchors and stators of electronic machines PUNS 5. The device has light and sound alarms, allows you to find an interval closing of windings, a break, measure the insulation resistance of the coils.

The device operates in 2 modes-“anchor” and “stator“. Change of mode occurs using a switch. The device is equipped with a comfortable device for installing and fixing the checked motor. It consists of 2 paws attached to the shaft. The paws move freely along the shaft, which allows you to change the distance from them and inspect the engines of various sizes. Check is carried out using 2 probes. For the presence of a cliff or closure on the stator winding indicate special reddish LEDs and sound signal. Read more the check procedure is described in the annotation to the device.

Checking the engine windings

Rotor electronic tester is a standard digital multimeter. Before proceeding to testing the closure, you should check the multimeter and its readiness to work. The switch is set to measure the resistance and touch each other’s probes. The device must show zeros. Set the maximum measurement value and conduct a check:

• First you should check the rotor for a chain break. Touching a black probe to the contact ring, red should be rolled red. The arrow of the device went off scale, which means that the winding has a break in the circuit of the boots. The rotor should be given to rewind;
• We measure the resistance to determine the possibility of short circuit on the case. We fasten the black probe on the contact ring, the red roller should be reinforced with red. In the case of a low indication of the resistance and sound signal, such an anchor must be given for repairs;
• Carrying for a dialing for interval circuits of rotor turns. Reinforce the probes on the contact rings of the anchor. With a value on the scale of the device, from 1.5 Ohms to 6 ohms, we checked a working device. All other values ​​on the scale mean a multimeter malfunction.

On this, the rotor check is completed. Once again, the main stages of determining the malfunction should be reminded. Before checking, an angular grinder or any other device should be de.energized. Before measurements, you should visually inspect the housings, isolation and lack of soils at the stature and rotor.

It is necessary to clean the surfaces of contacts from blockages with dust and dirt. Pollution leads to an increase in current when engine power loss.

When disassembling the tool for the first time, write down all your steps. This will allow you to have a hint next time, avoid the appearance of unnecessary details during assembly. When the brush exit by the edge of the brush holder is less than 5 mm, such brushes should be replaced. You can check the inter.seal circuit by an electronic tester, that is, a multimeter.

The anchor of the corner grinder is most subjected to temperature, mechanical and electromagnetic loads. Therefore, it is a common cause of refusal to work the tool, and as a result, often needs to be repaired. How to check the anchor for performance and fix the element with your own hands. in our article.

The anchor of the angular grinder engine 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.

Read also: Manometer for Block with Propane

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.

• The breakdown of isolation to the mass is the closure of the winding on the metal case of the rotor. Occurs due to the destruction of isolation.
• Slopics of collector conclusions.
• Uneven wear of the collector.

If the anchor is faulty, the engine overheating occurs, the insulation of the winding is melted, the turns are shortened shortly. Contacts connecting the anchor winding to the collector plates are soldered. The current supply stops and the engine stops working.

Before you take the diagnostic device, inspect the anchor. It may be damaged. If the wiring is melted, the burnt insulation varnish will leave black traces or a specific smell. You can see bent and crumpled turns or conductive particles, for example, the remnants of the solder. These particles are the cause of a short circuit between turns. Lamels have bent edges called cocks to connect with the winding.

Due to violation of these contacts, the lamella is burned out.

Other damage to the collector: raised, worn or burnt plates. Graphite from brushes can accumulate between the lamels, which also indicates a short circuit.

• Place the resistance of 200 Ohms. Combine the probes of the device with two neighboring lamellas. If the resistance is the same between all neighboring plates, then the winding is serviceable. If the resistance is less than 1 Ohm and very close to zero, there is a short circuit between the turns. If the resistance is higher than average in two or more times, then there is a break in the windings of the winding. Иногда при обрыве сопротивление настолько велико, что прибор зашкаливает. On the analog multimeter, the arrow will go to the right to the right. But it will not show anything on the digital.

Diagnosis of an anchor winding multimeter

If you do not have a tester, use a 12.volt bulb with a voltage of up to 40 watts.

• Take two wires and connect them to the lamp.
• On a minus wire, make a gap.
• Serve voltage on wires. Apply the ends of the gap to the collector’s plates and scroll it. If the light bulbs burns without changing brightness, then there is no short circuit.
• Make a testing test for iron. Connect one wire with lamellas, and the other with the rotor iron. Then with a shaft. If the light bulb is burning, then there is a breakdown on the mass. The winding closes the rotor or shaft.

Visual examination of the anchor before checking

• The winding of the anchor of the electric motor. We are looking for cliffs or visible traces of combustion of the wire.

• Contacts. The entire winding is soldered to the collector lamella. These points must be checked for integrity.

If the collector is too deep, the anchor must be replaced. Gari traces on windings or contacts indicate that the detail is faulty. You can rewind, of course, but this is ungrateful, and requires special skills. It’s easier to buy a new one.

Device and electrical circuit of corner grinders

Over the long years of the existence of such an instrument as an angular grinder, its appearance, as well as the internal device have practically not changed. To repair the corner grinder with your own hands, you need to know the device of its mechanical part, as well as an electrical.

If you look at the picture below, you can see what parts the angular grinder consists of.

• A wheel to adjust the spindle of the unit.
• An electric engine consisting of a rotor and stator.
• Start button. Sometimes a smooth start system is connected to it.
• Shock.resistant plastic.
• Spindle fixation button (used to change the tool).
• Surprising coupling. Protects the engine from overload, when jaming the tool.
• Protective casing. Closes the tool and protects the user from flying particles of the processed material, and also prevents human injury when the tool is destroyed, for example, an abrasive disk.
• Clamping. Unscrewed using a special key that comes with the power tool. There are also quick.sound nuts that can be unscrewed without a key.
• Gearbox and gearbox itself. Consists of the gears block that transmit rotational movements from the rotor to the spindle with a tool.

The figure below shows the electrical circuit of the angular grinder.

The electric part of the corner grinder has the following elements:

• electric cable with a fork for connecting to the mains;
• start button;
• stator;
• electric brushes (coal or graphite);
• collector;
• Anchor (rotor).

The following figure shows the connection diagram of the corner grinder, namely its engine.

All components of the electric motor perform certain functions.

• The rotor is a shaft on which coils and a collector are placed. The rotor, rotating in the magnetic field of the stator, transfers rotational movement to the gearbox angular grinder.
• Collector. It is a part of the rotor to which all control cables are summed up. Electric signals from the control unit to the engine pass through the collector. It is to the collector that the electrics are connected.
• Electric power plants. Their main task is the transmission of electric current from the power cable to the collector.
• Stator. Is a coil with a certain number of turns. The task of the stator is to create a magnetic field, which, interacting with the anchor, sets the latter in motion.

The main malfunctions of the corner grinder and their causes

According to statistics, most cases of failure of the corner grinder are associated with the electric part of the device. Some breakdowns can be insignificant, which allows you to repair corner grinding grounds with your own hands. But, for example, when the engine windings are blocked, the repair of an angular grinding machine can only be carried out by a specialist.

Corner grinder does not turn on

The reasons that the corner grinder does not turn on can be as follows:

• an electric fork is faulty;
• faulty electric cable;
• The launch button broke;
• the contact between the power cable and the button is disturbed;
• cliff of the contact wire of the electric shock;
• severe wear of electric grinding;
• The failure of the rotor or stator windings.

Corner grinder does not develop momentum

The reasons that the corner grinder is not gaining momentum can be different.

• Damage of the revolutionary control unit. To check this version, you need to connect the machine engine directly, bypassing the regulator and check the operation of the device.
• Electric cable malfunction due to constant overcurrents or mechanical damage. Because of this, the damaged wire begins to warm up under load, and the engine speed is falling.
• Dust pollution by dust. It is necessary to remove pollution with alcohol.
• Problems with brushes. They can be worn out or have a short contact wire, as shown in the next photo.

The brush, although half.wiped, is quite efficient. In this case, a short contact wire prevents the spring with press the electrode to the collector. This situation can also be the reason why the corner grinder stopped working in normal mode.

The electric motor heats up

The reasons that the angular grinder is heated may be the following.

• Incorrect operating mode of the device. As a result of overloads, the electric motor can be very hot, which often leads to blocking the windings.
• Destruction of bearings located on anchor. As a result, the rotor clings to the stator, the engine operation is difficult, and the windings overheat. The problem is solved by the replacement of bearings.
• Clogging of the ventilation ducts through which the air enters the engine cooling. It is necessary to clean the ventilation holes from dust.
• Damage to the impeller, which serves to cool the engine. It is installed on the rotor, on the opposite to the collector side. If the impeller is broken, it must be replaced with a new.
• Interpreter short circuits of the stator and rotor windings. Rewinding the coils or replacing these parts with new.

Ringing the stator of the corner grinder with your own hands

408-317 Stator for Bosch GWS7-125/GWS7-115 Hammer. Photo 220 volts

As an electric drive, an asynchronous collector engine is used in grinders. One of the main nodes of its design is the stator, which always works paired with the rotor and creates a magnetic field with which it rotates.

In case of a malfunction of the stator, the corner grinder fails and is subject to repair. You can repair the stator in the main two ways. either replace a defective stator with a new one, or using rewinding the burned winding changes to a new one.

Such repair with independent execution requires certain knowledge and skills

Corner grinder and stator device

Stationary asynchronous electric motors usually have a special case where the stator and rotor are securely attached.

In the grinder, the role of the supporting element for the main units of the electric drive is played by the actual case of the power tool itself. It is usually made of high.strength plastic, into which the stator is tightly inserted.

This design significantly reduces the weight and overall characteristics of the corner grinder, which is important for manual household devices.

The causes of breakdowns

408-105 Stator for angular grinder Hitachi G18SE3 and Hammer. Photo 220 volts

The most common reason for the failure of the stator of the corner grinder is a violation of operating conditions. Asynchronous engines have the ability to maintain speed, regardless of the value of the active load. This is both a dignity and a disadvantage.

The ability to perform work at high loads is accompanied by overheating of the tool, which contributes to prolonged operation to the occurrence of malfunctions in the winding and stator windings. Under the influence of high temperature, the protective layer of the insulating coating is burned out, which leads to the failure of electric nodes.

The main malfunctions

The main malfunctions of the stator are the following:

How to call

For high.quality diagnosis of an angular grinder stator, a complete disassembly of the power tool should be performed in order to eliminate all other structural elements, including the rotor to ensure free access to all its parts. At the initial stage, it is necessary to perform a visual inspection. For a more complete picture, it is necessary to check the presence of defects using electrical devices. What devices and how to call the stator of the corner grinder is described in detail at the link “How to call the stator of the corner grinder”.

Winding scheme, how to choose the thickness of the wire

Bulgarian stators have a very similar design and differ in the size of the details in which the magnetic flux is formed, the number of turns into the windings and the diameter of the wire. The standard connection diagram of the Bulgarians is shown in the following figure.

Here L1 and L2 indicate the coils of the stator.

Important: the coils after rewind should be installed according to the above scheme, where the beginning and ends of the windings are diagonally, as shown in the figure:

The burned winding is removed, while it is necessary to collect information about the old coils: determine the number of turns, the diameter of the wire, the beginning, end of the winding and the required direction during diverse work. The number of turns is determined by the direct account of the delays after cutting out the coils of the coils.

The diameter of the wire should correspond to the replaced windings as close as possible. Therefore, as a measuring tool, the most suitable is a micrometer with an accuracy of measurement up to 0.01 mm. The measurement is carried out on the surface of the wire of the burned coil on the surface of the surface of the wire.

Necessary tools

Locabulary whole.hand hammer 500 g. Inforce. Photos all tools.RU

• Various hammers: metal, wooden, several sizes.
• For manipulations with coils, pliers, round.liners, pliers are used.
• Stripping the surface surfaces from pollution and isolation is performed using a metal brush.
• The required cleanliness of the surface of the stator can be obtained using an electric drill with appropriate nozzles.
• In addition to a micrometer, a caliper and a ruler are used for less critical measurements.
• Control the electrical parameters of the coils after rewinding can be by multimeter.
• Cambrows, insulating cardboard, bicopic tape special varnish for impregnation. auxiliary materials for repair technology.

How to rewind at home, stages of work

Repair begins with the removal of the failed old winding. With the help of pliers (pliers, round.liners) from the old winding, the grooves of the stator are freed.

How to rewind the stator of the corner grind

408-317 Stator for Bosch GWS7-125/GWS7-115 Hammer. Photo 220 volts

As an electric drive, an asynchronous collector engine is used in grinders. One of the main nodes of its design is the stator. which always works paired with a rotor and creates a magnetic field with which it rotates. In case of a malfunction of the stator, the corner grinder fails and is subject to repair.

You can repair the stator in the main two ways. either replace a defective stator with a new one, or using rewinding the burned winding changes to a new one. Such repair with independent execution requires certain knowledge and skills. The article describes tips for those who want to learn how to make it on their own.

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 angular grinder (angular grinder), 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.