Launching corner grinders without smooth start. How to make a smooth launch of power tools from a conventional outlet.

How to make a speed controller for a corner grinder with your own hands?

The most common surprise in work is the failure of the electric motor winding. This can happen after a few launches of a new tool. The problem is formed due to a very high speed of rotation. At the time of turning on the machine, several consecutive actions take place at once:

All this occurs in a very short period of time, which gives a huge load on each node of the corner grinder, especially to the electrical winding. As a result. it breaks off.

Many models are originally equipped with smooth starting devices and speed regulators, but they have no great popularity due to high cost. On more budgetary, it is quite realistic to assemble a revolution regulator for corner grinder with your own hand, and the smooth launch is collected on the same chip. One action is solved by two main problems of such a necessary tool.

Those who worked as a corner grinder with tiles, stone and similar materials know that the quality of the cutting and appearance of the region suffers greatly from high speeds, and the tool itself is literally “killed” from such works. The same problem with metal details: aluminum and other soft alloys must be cut at minimum speeds, and thick and solid canvas at maximum speeds. The processes of grinding and polishing surfaces at high speeds will spoil the material.

The installation of the speed regulator will significantly expand the existing functionality and will not be worried about the performance. And the prevention of breakdowns never interfered with anyone.

Smooth starting blocks with three wires

By the way, be careful, there are similar devices, but with three wiring. For example XS-12/D3.

Or other models look like krrqd.

But they are collected on a slightly different principle and they need to be installed after the start button, in the tool itself. The voltage to them should be supplied only at the time of the trigger button of the corner grinder and immediately disappear after releasing it.

The phase is made to contact “A”, zero on “C”. Further, the phase goes to the engine with the output wire of control (this is just the third wiring).

Without a button, such a device will be constantly under a voltage of 220V, which is not permissible.

This is not in the two.wire block, since it is connected to the rupture of the circuit, and the voltage (potential difference) is applied to it only at the time of start.up and operation of the tool.

Another moment is the so.called electric brake or brake winding on ends. He may not work with a 3 wired external SPP, but with a 2-wired model will be.

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.

The corner grinder sparkles

If you notice a strong sparking when turning on an angle grinding machine in the place where the collector is located, then the reasons for this trouble may be the following.

Damage to the anchor winding: a break in one or more sections of the winding, an interval circuit. With such breakdowns, increased noise appears, engine speeds fall and brushes burn.
The contact between collector plates and winding was violated.
Weakly clamping brushes. With prolonged modes of corner grinding, the springs overheat and can “eat up”, while losing the elasticity.
Balance of the engine rotor.
Violation of the cylindrical surface of the collector. This sometimes happens after rewinding, if the anchor is not pulled on a lathe, but immediately installed in the device. In this case, you can also observe that the brushes sparkle excessively.
Between the collector’s lamels, insulation is impaired. There may also be clogging of the grooves of the proxy with graphite or breakdown between the lamellas.
Bearing wear that causes the rotor bearing also leads to the fact that brushes sincle greatly.
Violation of the geometry of the rampage shaft. This usually happens with an inaccurate disassembly of the electric motor when the shaft bends.
The graphite brushes are installed in the wrong brand. Brushes are selected based on the expected revolutions and stress.
Raising one or more lamellas leads to the fact that brushes are quickly burned. This happens due to overheating of the engine during prolonged operation. As a result of the glass mass, which serves as the basis of the collector, softens, and the lamella begins to rise. Due to the fact that the lamellas are raised, the brushes are erased very quickly.

Diagnosis of the electric part angular grind

As mentioned above, most often the angular grinder refuses to work due to the breakdown of the electrical part of the unit. For the correct diagnosis of electrical circuits of the tool, the wizards for the repair of electrical equipment are used by a special device. a tester.

If you pressed the assembly button, and it does not work, then in 90% of cases the cause of the breakdown is not so serious that you cannot repair the angular grinder with your own hands.

Experts advise adhere to the basic rule of repairing power tools: move from simple to complex.

First of all, it will take a check of an electric cable and a fork at its end. If it is collapsible, then spin it and check the reliability of the contacts. Otherwise, you will have to disassemble the angular grinder (remove the casing of the device) and “call” the cable by the tester, and also make sure that the current is suitable for the “Start” button contacts. If the device shows a break, then the cable should be replaced with a new.

The situation when the current enters the button, but does not go further (when the position is turned on), indicates a malfunction of the switch. The button cannot be repaired. It must be replaced with a new one, but first march the contacts removed in order to connect them correctly in the future. When the contacts are incorrectly connected, the engine winding may burn out.

If when checking it turned out that both the cable and the start button are working, but the current does not enter the brushes, then it is necessary to clean the contact plates of the brush holders. In case of ineffectiveness of this procedure, it is recommended to replace the brushes. Further, if everything is fine with the brushes, and the current comes to them, you should check the rotor and the stator for the presence of circuits and cliffs.

Checking the anchor of the electric motor

The electric motor rotor may have the following malfunctions: inter.seal circuits and wiring at the lamella contacts. You can check the anchor of the corner grinder with a multimeter: the device is converted into the mode of change in resistance, the value of 200 Ohms is set, and the resistance between two neighboring lamellases is measured using probes. Thus, it is required to check all pairs of lamellas. If the resistance indicators are the same, then the rotor winding has no damage. Detection of other resistance values during the “rang”, as well as the identification of a chain cliff indicates a malfunction in this coil. In this case, it will require repair of the anchor of the corner grinder.

Typically, rupture rupture occurs in the joints with the winding. Inspect the places where the coils are connected to the lamellas, make sure the reliability of the contacts of the contacts.

If you do not have a measuring device, then you can check the rotor by using a 12 V light bulb for these purposes and the battery. Power should be in the range of 30-40 watts. The verification is done as follows: supply voltage 12 V from the battery to the corner grinder fork, connect the light bulb in the rupture of one wire, start rotating the corner grind. With a good winding, the light bulb will burn evenly, without blinking. With an interval circuit, the degree of intensity of a spiral of the bulb will change. In this case, the repair of the anchor of the corner grinder with your own hands will be difficult, since the winding scheme is quite complicated, and the process itself requires special equipment and knowledge. Therefore, this operation is recommended to entrust to specialists. But the best way out of the situation will be to replace the anchor on the corner grinding of a new.

If the bulb does not light up when testing the rotor, this indicates the presence of a cliff in the stature or closing in its windings, as well as problems with electrographs.

Checking the electric motor stator

To check the stator of the corner grinder, the multimeter is used, as in the previous case. Values need to be set at 20-200 Ohms and make the following. Touch one probe to the contact of the stator winding, and the second. to the part of the part. If the device shows resistance, this means that a breakdown on the case occurred. Touch the probes to the contacts of one winding, and then to the contacts of another. If the resistance is the same, then the coils are serviceable. If on one winding the device shows a chain break, then it will require a rewinding of a stator or replacing a part with a new.

Rewind the stator at home, without special knowledge, skills and equipment, it will be problematic. It is better to contact specialists professionally engaged in engine rewinds.

Signs of breakdowns in the electrical circuit and diagnosis of the cause

Excluding the mentioned malfunctions of the mechanical part of the corner grinding, an alarming signs of a malfunction of the electric circuit can be:

quick overheating of the tool;
The brushes begin to spark;
revolutions are not adjusted;
does not gain revolutions and power;
The corner grinder does not turn on at all when the start button is pressed.

It is recommended to conduct diagnostics in stages from simple to complex, so you need to start with the wire. For diagnosis, you will need a multimeter and screwdriver for parsing the case.

Power wire

For the “calling” of the supply cable, the multimeter must be turned on in ohmmeter mode. One probe is installed on the fork rod, and the second. on one of the button contacts. With a good wire, each of the two current.receiving rods will be called with the corresponding contact. In case of malfunction, the wire must be replaced.

Button

Checking the goodness of the button is performed similarly. The entrance contact is nicknamed with the contact of the exit, only at the same time it needs to be pressed. The faulty button is not subject to repair and is replaced by a new.

Revolution adjustment unit

If the revolutions of the corner grinder have ceased to be adjusted, then the reason is obvious. over, more often the failure of this block is accompanied by complete “silence” when turned on. It is not difficult to call the turnover control unit for the lack of conductivity, but to determine the blown part and fix it only to an experienced specialist.

Engine

If all the previous parts of the chain are working, then the breakdown is hidden in the engine. The serious causes of the malfunction can be an inter.seal circuit or a breakdown on the case. With such malfunctions, the corner grinder does not necessarily stop working immediately, they also indicate overheating, loss of speed and power speed. Fortunately, malfunctions of this nature rarely happen, but the exploring of the brushes will sooner or later inevitable.

Brushes

When working corner grinders, graphite brushes are gradually erased. Their life on average is designed for 2-2.5 years, so many manufacturers include spare tools. The wear of the brushes is evidenced by the appearance of sparking, which is evident through the grate of engine ventilation on the housing. If there are no other signs of a malfunction, then it is quite simple to replace them without spending time on the rest of the diagnosis.

Stator

To determine the serviceability of the stator, it is necessary to measure the resistance of its windings. To do this, the ohmmeter range is set to 200 Ohms and measured, attaching the probes first to the ends of one winding, then the other. If the multimeter readings are good for both windings should be the same. You should also make sure that there is no breakdown for “iron” and call the windings with the stator body.

Anchor

An anchor is called a collector engine rotor, on which several windings are made. The ends of the windings are soldered to the collector lamella, through which you need to measure. Measuring the resistance of each winding, you need to attach the probes to the lamellas in pairs. Here also the indications of the resistance of all windings of the anchor should not differ.

If any of the windings of the anchor is not at all nicknamed, then the reason may be the lack of contact with the lamella. You can determine this visually and fix the problem, taking the soldering iron in your hands.

Engine rewinding

Having revealed the difference in the resistance of the windings in the stature or in the rotor, you can confidently diagnose the inter.seal circuit. In this case, the engine needs rewinding. You will also have to rewind if the stator winding is pierced on the case.

It will not work to perform the winding on your own at home, since, in addition to experience, you will need a special tool and adaptations. In addition, the new winding needs subsequent processing with special varnish and exposure in the furnace at a certain temperature. This allows you to exclude the vibration of the turns during operation and avoid the premature failure of the engine. The best option would be to hand over the engine for rewinding to a certified service center.

How to independently carry out repair of corner grinders

How to make adjustment for angular grinder at home, home.made options

Relatively simple adjustment scheme on semiconductor devices, some users who have the skill of working with electrical technologies can do it on their own. However, it will not be able to effectively adjust the current strength with a decrease in speed, and the value of torque on the working shaft may be insufficient. This will not be a big obstacle to polishing work, cutting fine metal or processing soft materials (plastic and like it).

If the manufacture of the scheme with your own hands causes difficulties or the nature of work with a corner grinding, for example, with a stone or ceramics, requires the use of a more complex system with a microcircuit, it is possible to purchase a finished block and install it on an angular grinder.

The standard dimmer for changing the brightness of lighting found the use of corner grinder in the operation in the next video.

Important: the power of the dimmer should be at least at least the power of the corner grinder. The quality of polishing work and a smaller amount of dust secreted during their conduct determine the feasibility of finalizing the electrical part of the corner grinder using a standard dimmer

This design requires a reasonable dosage of the manual load during work, since the engine overheating is not excluded and there is a risk of failure.

Control of the speed of some electrical tools can be carried out not only by hand using a rotary wheel. It is more convenient to control some devices using pedals. In the next video, the author demonstrates this control method. Here, the revolutions of the revolutions made in the form of a pedal from the sewing machine are taken and adapted to control an electric jigsaw. Nothing interferes with making this option of controlling a corner grinder, however, the need for this should be justified by the nature of the work ongoing.

Without loss of power

A regulator that changes speed without losing power, it is almost impossible to make it independently. Such devices with feedback on tracking the speed and adjustment based on their current strength are produced only by manufacturers of the Bulgarians. Only regulators on semiconductor circuits can be manufactured or installed independently, which do not guarantee 100% conservation of power when changing the rotation frequency of the coat of corner grind.

How to reduce/increase the speed of disk rotation

Ready.made Chinese.inexpensive, the fee can be mounted, as the author of the next video made, in a separate plastic case connected to a cable with a fork and an outlet installed on it. By connecting the fork to the electric network, and the corner grinder to it through the outlet, you can change the value of the variable resistance by the adjusting wheel, install the required speed on the angular grind. The surface polishing with such a power tool will be made much better.

How to put, connect

Bulgarian users came up with many different ways to lay the revolutions and corner grinding control regulator, for which it is intended. It can be as an autonomous element outside the corner of the corner grinder, and integrate inside. Below are a video with such options.

As an external control device in the next video, the author uses a carrier with a power button. Just instead of this button, the finished Chinese board on semiconductors is inserted. Electrical work technology is performed at a good technical level. It will be conveniently used to use such a carrier while performing a corner grinding of work requiring the use of low speeds.

Placing additional devices inside the corner grinder body is a rather complicated problem. Non.trivial decisions are often required, as, for example, in the next video. Here, in order to place a fee with revolutions and a smooth start, I had to change the buttons involved in the operation of the turning on/off lever. In the liberated space, it was possible to place a simistor with a radiator of cooling the revolutions and a fee with a smooth launch of a corner grinder.

How to disable, remove voltage sensor

In the next video, the author at one of the models of a corner grinder failed the speed regulator. Attempts to repair it were unsuccessful. The author describes how to remove the broken regulator and assemble the electrical circuit without it (just connect the stator windings directly through the switch). The corner grinder will function, only at the maximum speed alone.

Operating principle

The device of the smooth start into the corner grinder of the factory design is located inside the corner of the corner grinder and is connected by contacts with the inclusion button and the windows of the electric drive stator. A certain time is required for the release of the angular grinder for the nominal mode and the electromagnetic field, created by uniformly increasing current power and voltage through the stator windings, forces the anchor of the drive of the corner grinder smoothly recruit.

For Bulgarians, where the manufacturer does not provide for such a device, usually in very rare cases it is possible to hide it under the corner of the corner grinder. Most often, it is performed in the form of a separate block, equipped in the rupture of the power cable chain. However, the principle of action does not change from this.

How to connect a regulator to a corner grinder

To connect a home.made power regulator does not require special knowledge, and any home master will cope with this task. The module is installed in the rupture of one wire, through which there is a power to a corner grinder. That is, one wire remains intact, and the regulator is soldered into the rupture of the second.

In the same way, you can also connect a factory power regulator worth about 150, which is often purchased by masters in China.

If there are very small places in the corner grinder, then the regulator can be placed outside the tool, as shown in the next photo.

The regulator can also be placed in a socket and use it to reduce the momentum not only in corner grinders, but also in other electrical appliances (drills, sharpener, milling or turning machine for wood, etc.D.). This is done as follows.

Buy a camshaft at the electrical goods store (suitable with dimensions of 65x65x50 mm).
You should also buy an outer outer outlet of small sizes and a network cable with an electric fork.
In the side wall of the camshaft, drill a hole for inserting a variable resistor regulator into it.
Factory regulator or a home.made device is located inside the camshaft. All protruding parts in the box that interfere with the installation can be cut.
The outlet should be fixed on the lid of the camshaft, previously stretched out the wires inside the last.
In the figure above, you can see that the wires of the network cable relate to the radiator, which heats up during operation. Therefore, a pipe from PVC is dressed on it. But it is better if you drill a hole in another place for a network cable to exclude its contact with the radiator.

Makita Angle Grinders with Non Removable Guard

The regulator is connected as described above. on the break of one of the wires of the supply cable.

The following photos show how a ready.made socket will look like a built.in angular grinding speed controller, which can be used for other electrical appliances.

Instead of a camshaft, you can use any plastic case of a suitable size. Also, the box can be made independently by gluing pieces of plastic with an adhesive gun.

Ways to connect the regulator into the corner grinder body

The speed regulator block is a very compact device that is easily placed inside the corner of the corner grinder. On the Internet, you can easily find schemes and guidelines for the manufacture of such regulators. But how advisable it is to do it himself-everyone decides for himself, because in online stores the finished unit can be purchased for only 300-500 in the photo below the electronic speed controller for a voltage of up to 250 V and a nominal current 12 A with a standard step-by-step adjustment on the grilles Six positions. It depending on the seller.

In the grip part (rear handle) of the corner grinder to install the regulator with such dimensions of the place more than enough. In the low.power, the corner grinder is usually closer to its end, and in more powerful ones. between the handle and the engine or in the handle itself (see. photo below). Special skills for installing such a regulator are not required, t. to. It just needs to be included in the rupture of the power circuit of the angular grinder of the corner grinder.

The video below shows the resuscitation of an old corner grinder with equipping its rotation speed regulator. Interesting button control number of revolutions with a value after turning off the supply voltage.

Connection of a smooth start

The electronic speed controller is mainly needed by domestic masters to expand the capabilities of corner grinder in terms of grinding and processing soft materials. Professionals, as a rule, use a specialized tool for certain types of work and use an angular grinder only for its intended purpose. With a smooth start device, the situation is different. For a household purpose tool that has a slight power, this option is useful, but optional. But for professional Bulgarians with drives over 1000 watts, it is vital. In addition to the above improvements of operational characteristics, smooth start is extremely important for the safety of the operator. Corner grinder with a circle of Ø230 and a capacity of 2000 W weighs 5 ÷ 6 kg, and in order to keep it during a starting jerk, certain efforts and a stable position are required.

The smooth starting unit can be purchased in retail chains and self.control over the case any corner grinder inside the case. The video below shows its installation on a new powerful corner grinder acquired by the author for food. This video is also interesting in that its author, using a switch device, demonstrates the value of the current jump when the corner grinder is turned on first without smooth start, and then with this device.

The most advanced control device for corner grinding is the system for maintaining revolutions under load, which also performs the functions of the rotation speed regulator and provides a smooth start. On the Internet you can find a scheme for manufacturing such a device on the U2010b chip, but it is quite complicated even for those who have the initial skills of amateur radio. Is it possible to purchase a ready.made unit maintaining speed and how much it costs? If someone can answer this question, please share information in the Комментарии и мнения владельцев.

How to choose a end saw

In the scope of use, end saws are divided into:

household. have low strength, accuracy of cut, are not able to cope with high loads. Often have a little weight and modest technical characteristics.
Professional. intended for prolonged continuous work, have increased strength, and all the constituent elements are tightly fitted to perform a cut of high accuracy

Characteristics

Power. 1.1 kW.
Rotation speed. 4800 rpm.
Saunch parameters: height. 50 mm, width. 110 mm.
Disc parameters: diameter. 190 mm, landing hole. 30 mm.
Work angles: tilt. up to 45 °, turn. up to 46 °.
Mass. 8 kg.

Elitech PT 1825K

According to the main characteristics from the previous end saw, this model is characterized by the frequency of rotation of the circle, but the difference is not so significant, so it is able to process the same materials. thin aluminum, wood, plastic. With its help, you can process blanks up to 305 mm wide. The use of the laser pointer provides increased accuracy.

Long blanks are fixed using an extension bracket. For processing various materials, the use of disks up to 2.8 mm thick is provided, while their diameter should not exceed 255 mm. Protection is provided by the casing, which does not allow mechanically exposure and dust to get to the disk.

The angle of inclination and turn is 45 degrees.
Long network cable for connecting to the mains.
Complete disk with 60 teeth.
Function of smooth start/braking.
Adjustable depth of cut.

The paw glides along the glossy surface, so it is difficult to firmly fix the rotation angle.

Bosch PCM 8 S

An excellent end saw with a length and a strong aluminum building, resistant to deformation. Light and compact device provides the accuracy of the sawdust, it is used even for large products. Stillness is due to the use of a special clamp. Also, in the process of cutting, table expanders, lasers, depth limiter are used.

To work with wide blanks, there is a function of the broach. The laser pointer provides maximum accuracy when sawing, it is not clogged with sawdust, so the fishing line for the trimmer and the direction remain noticeable under any conditions.

The grooves are sawn using a depth limiter.
Vacuumber in the kit.
Compact dimensions, low weight and handle for simplicity of carrying.
Spindle fixer for replacing disk.
Saw Cool Disk included.

Zubrov ZPT-255-1800 pl

A good ending saw with a length designed for accurate cutting sawing. It is made by the company, so finding details on it is very simple. The trouble.free service life is at least 5 years, and with proper care, it will be several decades. This is a reliable, strong installation that can be used to work with metal, wood, plastic. A saw with many teeth has a large thickness, which allows you to expand the scope.

The laser pointer provides the accuracy of the sawing, allows you to draw a flat, clear fishing line for a trimmer. The incision is carried out at any angle, for this, a table rotation is provided, the possibility of fixing in an arbitrary position. The workpiece is attached by means of clamp.

Automatic protective casing.
Maintaining the cleanliness of the workplace by connecting the vacuum cleaner.
Warranty 5 years.
Good build quality, materials.

Homemade options

The simplest scheme

UPP with the regulation of revolutions on the thyristor KU 202 has been widely used due to a very simple execution scheme (Scheme 1). Its connection does not require special skills. Radio elements for him to get it very simple. This model of the regulator is made of a diode bridge, a variable resistor (acts as a regulator U) and the tiristor setup circuit (feed U to a 6.3.volt number control exit) of a domestic manufacturer.

The basic principle of operation is to adjust the revolutions of the instrument electric motor due to restriction of power in manual mode. This circuit allows the use of power tools with a capacity of up to 1.5 kW. To increase this indicator, it is necessary to replace the thyristor with a more powerful one (information about this can be found on the Internet or a directory). In addition, it is necessary to take into account the fact that the thyristor control scheme will differ from the original. KU 202 is an excellent thyristor, but its significant drawback is to set it up (a selection of parts for the control scheme). To make a smooth start in automatic mode, scheme 2 (SCP on the microcircuit) is used).

Smooth launch on the microcircuit

The best option for the manufacture of SCP is the SCP scheme on one simistor and microcircuit, which controls the smooth opening of the transition P-N type. The device from the 220 V network is powered and it is easy to assemble it yourself. A very simple and universal scheme of smooth starting the electric motor also allows you to adjust the speed (Scheme 2). Simistor can be replaced with similar or with characteristics exceeding the initial ones, according to the reference book of the semiconductor.type radio elements.

Scheme 2. Scheme of smooth launch of power tools

When starting the electric motor, the UD on KR118PM1 and the smooth growth of the capacitor C2 occur. The thyristor opens gradually with a delay depending on the capacity of the control capacitor C2. With a capacity of C2 = 47 μF, a delay occurs when it is launched about 2 seconds. It depends directly in proportion to the capacitor capacity (with a larger capacity, the launch time increases). When disconnected, the angular grinder capacitor C2 is discharged using the resistor R2, the resistance of which is 68 K, and the discharge time is about 4 seconds.

To regulate revolutions, you need to replace R1 with a variable resistor. When the parameter of the variable resistor changes, the power of the electric motor occurs. R2 changes the value of the current flowing through the input of the systemist. The simistor needs cooling and, therefore, a fan can be built into the module case.

Thus, to launch electric motors of various tools, it is necessary to use the UPP of the factory manufacturing or homemade. SCP are used to increase the life of the tool. When the engine is launched, there is a sharp increase in the consumption current by 7 times. Because of this, it is possible to burn stator windings and wear of the mechanical part. SCP allow significantly reducing the starting current. In the manufacture of SCP, you need to comply with the safety rules when working with electricity.

Making a smooth start socket

The most important requirement for such a socket is its mobility. Therefore, you will need a carrying.

With it, it will be possible to smoothly start the tool anywhere. in the garage, in the country, during the construction of your house in different areas of construction site.

First of all, the carrier needs to be disassembled.

The main food wires in it can be either soldered or connected on screw clamps.

Depending on this, your additional outlet will also be connected. This should be an additional socket near the carrying, in order to be able to simultaneously connect the tool in different modes.

By the way, if you mistakenly turn on the corner grinder or circular, having a factory built.in smooth start in a socket, also equipped with such UPP, then everything will work surprisingly. The only moment is that you get a delay in the launch of a saw or a disk revolution for a couple of seconds, which is not very convenient in work and can puzzle without a habit.

Here are the real trials of such a connection conducted by one master from YouTube Barmaglot777. His commentary after such tests on the Dremel type engrave, Bosch drill, Makita milling cutter, Interskol circular saw:

Next, for assembling the outlet, take a multi.core copper wire with a section of 2.5mm2 and clean its ends.

After that, it is necessary to carry the contact site on the carrying where this wire will be soldered.

Reliably solder the cable veins to these sites.

Carefully lay the wires and close the extension cord.

Take a square outer outlet for installation on the outer surface of the walls, and in its case try on a smooth start unit. Since it has compact rectangular dimensions, it should fit there without any problems.

Mount and fix the gourder of the outlet on the same site with an extension cord.

PP unit connect to the rupture of any wire, phase or zero. Do not confuse, the phase and zero are not supplied to it at the same time.e. 220v.

It is installed on one of the wires.

Also for this BPP, there is no difference from which side to make the entrance, and with what exit. Twisters plow and isolated by thermal shrinkage.

After that, all the inside of the sockets are going to the case and it remains to close the entire structure with a lid.

This is where the whole alteration of the carrying and manufacturing of the outlet can be considered completed. In time it will take you no more than 15 minutes.

How to connect, installation

For users of the Bulgarians who do not have skills of electrical work, you can purchase a separately sold unit unit unit. It will only be necessary to install it correctly. I exist two options for placing a starting device. inside the body of the corner grinder and, in case of impossibility, outside.

In the next video, the author is one of the purchased blocks using a short refinement of the corner grinder body. Two wires of the starting unit are connected according to the following scheme: one wire to the circuit breaker contact, the other to the winding of the electric drive stator.

Feeling extension

There are many options for finalizing the extension cord. If we need the maximum load, then the BPP can be performed in a separate case, as which you can take the same socket, shaking the filling from it. If the household tool and the radiator are not needed, then it is quite possible to place such a module directly in the outer outlet.

Without a radiator, the module fits perfectly in a socket

Healthy! It is convenient to place this modified outlet on one site along with sockets included directly on the network. This makes the extension cord universal. One socket with a smooth start, the remaining usual for 220 in. The one that is smooth, just wrap it from ordinary.

Extension cord with voltage adjustment

If maximum speeds are optimal for working with corner grinder, then some other power tools are more convenient to use in different modes. If such tools are not equipped with its own regulator or the latter fails, then you can use the extension cord with voltage adjustment. To do this, it is enough to collect a simple scheme:

Here, the BTA16 system is used as a control element, designed for current 16 A. If it is installed on the radiator, then the regulator can be used with a power tool with a capacity of up to 3 kW. If there is no radiator, then the load power should not exceed 600 W.

Instead of a symmetrical db3 dinistor, you can use HT-32, STB120NF10T4, STB80NF10T4, BAT54. Revolutions are adjusted using a variable resistor with a resistance of 500 kOhm preferably with a linear characteristic.

Such a block with a radiator and a variable resistor, of course, will not fit in the outlet, so it will need its body. The photo below shows one of the options. the diagram is placed in the case of the failed wall.patch dimmer.

Option option for the speed regulator

As we are convinced, it is not difficult to equip the extension cord with a smooth start circuit. everyone who is familiar with the basics of electrical engineering will cope with this. Yes, you have to tinker for half an hour, but now the tool will be alive and the hands are intact.

How to connect, installation

Homemade options

There are many schemes for the modernization of power tools using SCP. Among all varieties, devices on Simistors are widely used. Simistor is a semiconductor element that allows you to smoothly adjust the power parameters. There are simple and complex schemes that differ among themselves options for execution, as well as the supported power, connected power tools. The constructive design is internal, allowing you to integrate inside the body, and external, made in the form of a separate module, which acts as a speed limiter and starting current during direct starting angular grind.

The simplest scheme

Scheme 1. The electrical circuit of the internal unit with speed adjustment and a smooth start (electrical circuit circuit)

Due to the size and number of parts, the regulator of this type can be built into the power tool case. In addition, the handle of a variable resistor should be removed and the revolution regulator itself can be finalized by integrating the button in front of the diode bridge. The basic principle of operation is to adjust the revolutions of the instrument electric motor due to restriction of power in manual mode. This circuit allows the use of power tools with a capacity of up to 1.5 kW. To increase this indicator, it is necessary to replace the thyristor with a more powerful one (information about this can be found on the Internet or a directory). In addition, it is necessary to take into account the fact that the thyristor control scheme will differ from the original. KU 202 is an excellent thyristor, but its significant drawback is to set it up (a selection of parts for the control scheme). To make a smooth start in automatic mode, scheme 2 (SCP on the microcircuit) is used).

Smooth launch on the microcircuit

The best option for the manufacture of SCP is the SCP scheme on one simistor and microcircuit, which controls the smooth opening of the transition P-N type. The device from the 220 V network is powered and it is easy to assemble it yourself. A very simple and universal scheme of smooth starting the electric motor also allows you to adjust the speed (Scheme 2). Simistor can be replaced with similar or with characteristics exceeding the initial ones, according to the reference book of the semiconductor.type radio elements.

Scheme 2. Scheme of smooth launch of power tools

The device is implemented on the basis of the KR118PM1 chip and the Simistor. Thanks to the universality of the device, it can be used for any tool. It does not require tuning and is installed in the rupture of the power cable.

The main function of capacitors C1 and C3 is the protection and management of the microcircuit. The Simistor should be selected, guided by the following characteristics: Direct U should be 400.500 V and direct current should be at least 25 A. With such values of radio elements, it is possible to connect a tool with a capacity of 2 kW to 5 kW to the UPP.

DEWALT Product Guides. Grinder Basics

Advantages of UPP

The inclusion of SCP in the electric drive gives the following advantages:

The ability to use powerful engines for low.power electric networks. The restriction of current throws avoids the operation of protective electrical appliances, overheating of transformer windings that feed live lines, overloads and stops of generators, as well as reducing voltage in the network, which negatively affects other electric receivers. The use of SCP allows you to install industrial equipment with heavy and especially difficult starting conditions when limiting the power of the power supply, when the use of other electrical equipment to reduce the starting current is impossible.
Reducing wear of electric motors. Starting currents cause overheating of windings, aging their insulation, overheating and corrosion of contact groups, as well as to premature wear of switching devices. An increase in torque at direct start leads to an increase in the load on the bearings and other mechanical elements of the electric motor. Smooth start allows you to extend the life of the engines and increase the intervals between TO (maintenance) and repairs of electric machines.
Reducing wear of industrial equipment. The use of SCP provides smooth acceleration. This will reduce shock loads on the gear reducers, belt drives and other mechanisms.
Ensuring the safety of technological processes. Many inventive installations cannot be sharply stopped and launched. For example, quick launch of pumping units leads to hydraulic boards and emergency situations. The use of SCP reduces the likelihood of accidents.
The ability to abandon mechanical devices for braking, as well as electrical devices to limit current. The device of smooth starting is replaced by brake couplings, reactors, as well as other equipment.
Low cost. The average cost of SCP below the price of frequency regulators. In some cases, the installation of SCP is enough for the correct operation of the drive.
The presence of protection against abnormal and emergency operating modes. Some models of UPP protect against the disappearance of phases, asymmetric load and other abnormal modes.
The ability to embed in automation systems. SCP with microprocessor control devices support communication protocols with remote PC. Control and management of drives with such UPP can be carried out in automatic mode.
Reducing electromagnetic interference. When regulating the start of all three phases, the intensity of the magnetic field is reduced, which is created by the engine during launch. When using SCP, there is no need to install additional filters on low.current lines sensitive to the aims.

Installation of UPP gives a good economic effect. It is achieved by a decrease in the costs of that and repair of electric motors and technological equipment, electricity saving, expenses for the purchase of more powerful switching electrical devices, additional protection.

Sources:

https://delta-instrument.ru/dreli-i-pily/dimmer-dlya-bolgarki.html
https://avtotop.info/kak-otkljuchit-reguljator-oborotov-na-bolgarke/
https://domdetaley.ru/kak-podklucit-bolgarku-napramuu-bez-regulatora-oborotov/
https://italy-expert.ru/tehnologii/shema-plavnogo-puska-elektroinstrumenta.html
https://wikimetall.ru/oborudovanie/plavnyj-pusk-svoimi-rukami.html
https://101benzopila.ru/kak-sdelat-plavnyj-pusk-na-torcovku/
https://eibitechno.ru/stanki/shema-plavnogo-puska-bolgarki-svoimi-rukami.html
https://metrologiya-kazan.ru/stanki/plavnyj-pusk-dlya-bolgarki-shema.html
https://saturn-electro.ru/osveshchenie/plavnyj-pusk-shema-svoimi-rukami.html

Articles corner, grinders, make, smooth, start