Angle grinder sparks after changing brushes

7 reasons why electric motor brushes sparkle

In household electrical equipment, collector motors are widely used. Small dimensions, lightness, ease of operation have led to their presence in angle grinders, rotary hammers, circular saws, screwdrivers. The main disadvantage is increased wear of the brush-collector pair. Failure of this unit is predetermined by spark formation arising in it.

  • The device of the electric motor and the principle of operation
  • Causes
  • Wear of brushes
  • Short circuit in the armature winding
  • Malfunction in the stator winding
  • Pollution
  • Brushes incorrectly installed
  • Poor contact of the brushes with the collector
  • Mechanical disturbances
  • Conclusion

The device of the electric motor and the principle of operation

The principle of operation of an electric motor is based on the interaction of a conductor with a current in a magnetic field.

The magnetic field creates the stator.

The main element of its design for a DC motor is a permanent magnet, for an alternating current. an excitation winding. The rotor (armature) has its own winding, to which voltage is supplied with the help of a brush-collector unit. The interaction of magnetic fields makes the rotor spin.

The collector consists of a set of contacts in the form of copper plates located directly on the rotor. Micanite or mica cuffs act as insulators for each individual contact. Graphite brushes. sliding contacts pressed against the collector.

Mechanical disturbances

Mechanical reasons are caused by non-compliance with the requirements of design and technological documentation. Most of the mechanical causes are eliminated by the manifold groove on the lathe. This repair operation should be carried out by a qualified technician. Here are some types of faults that may indicate a breakdown:

  • The collector surface is uneven;
  • Shaft runout exceeds the value specified in the technical documentation;
  • Separate collector plates extend beyond the common level for all;
  • Insulation protrusion (mica);
  • The brushes in the brush holders are jammed;
  • On the contrary, the brushes are inserted into the brush holders with a large gap, which creates vibration during operation;
  • Brush holders are installed far from the manifold;
  • Uneven tension of the springs, as a result of the difference in the pressing force of the brushes.

Brushes incorrectly installed

If the brushes are positioned abnormally towards the collector surface, significantly more graphite dust is generated during operation. Displaced brushes need to be corrected.

Malfunction in the stator winding

A defect similar to the short circuit of the rotor winding occurs for the stator winding. You can check the presence by measuring the resistance of parts of its windings. If there is a strong difference, it is necessary to rewind the winding or replace.



The wear product of the brushes is graphite dust, which is an additional source of increased sparking. Dust accumulates between the plates, which creates additional conditions for the spark formation process. Preventive work on cleaning the collector with sandpaper and cleaning the dirt between the plates will keep it clean.

Poor contact of the brushes with the collector

The electric motor spends part of its operating time in overheating mode. Under these conditions, carbon deposits form on the manifold. Poor contact leads to increased sparking of brushes and even more soot.

It is necessary to clean the collector surface with fine-grain sandpaper. Use a screwdriver to increase the stripping effect. Clamp the engine rotor into the chuck and at low revs, sand the carbon off. Then you need to finally polish it on a felt circle.

Signs of a malfunctioning mechanism

In the process of using the angle grinder, it is impossible to avoid the ingress of small debris into the mechanism. This leads to short circuits and overheating in the area of ​​the copper plates. The rise in temperature causes the brushes to melt and burn. And as soon as the dimensions become close to the minimum specified by the manufacturer, the master may observe the following warning signs:

  • metal brushes on an angle grinder start to sparkle;
  • when working, the tool jerks or jerks;
  • if the brushes are heavily worn, a burning smell may appear.

Some manufacturers of angle grinder use special types of safety brushes. They are equipped with a special device that controls their length. As soon as the parameters of the parts do not meet the requirements, it blocks the operation of the mechanism until the malfunction is eliminated. This measure helps to protect the entire tool from failure.

Rules for replacing brushes in angle grinders from different manufacturers

A wise craftsman will not wait for a tool to show signs of breakage. Since the replacement of brushes is part of the maintenance of the angle grinder, it will regularly clean the manifold for contamination and inspect these parts.

It is worth remembering that manufacturers of brushes for an angle grinder always indicate the minimum size at which the product still retains its performance. This figure may differ slightly depending on the manufacturer.

Most tool models offer two options for the location of the electric brushes. In the first case, they can be inside the handle. In the second option, the brushes are placed on the body. However, regardless of the location of these parts, in order to prevent it, it is worth disassembling the tool and lubricating all its assemblies.

Before starting the parsing of the angle grinder, you need to de-energize it. Then you need to disconnect the tips, inspect the holder. After removing the brushes themselves, a thorough check is required for mechanical damage, which will indicate wear, requiring replacement of the part.

Here are examples of repair work on angle grinders from leading manufacturers:

Repair of Interskol models begins with removing the stator cover, after which it is necessary to unscrew the screws from the holder. The minimum residual length of brushes on the mechanisms of this company cannot be less than 5 mm.

On Bosch angle grinders, you just need to open the handle of the stator housing to remove the brushes. The device of this brand will not work with the length of the working brushes less than 8 mm.

When buying an angle grinder, you will find in-demand spare parts in the starter kit. From them you can decide which brushes to choose.

Angle grinder sparks after changing brushes

An angle grinder (or an angle grinder, abbreviated as an angle grinder) is an indispensable tool for construction and renovation work. The result of the loads during the operation of the device is the need to replace parts. If the repair is negligent, the entire mechanism can be damaged.

Brushes are especially often in need of replacement. Therefore, it is worth considering what is the cause of the breakdown. And how to change the brushes for an angle grinder.

Brief content of the article:

How to choose brushes for your angle grinder

New technologies involve the production of brushes by pressing carbonaceous material at high temperatures. This method increases the life of the parts due to less wear.

There are several main types of this part:

The most common are graphite brushes. For this, the main material from which the part is made is shaped. Then it is covered with a graphite layer and fired at temperatures from 2500 degrees. The result is a strong, durable connection that pays for the high cost.

Carbon brushes are considered the cheapest and most short-lived option. Low indicators of wear resistance are formed due to the lack of heat treatment.

The most reliable option is metal-graphite brushes. The composition of the coating, in addition to the carbonaceous material, includes copper with the addition of lead, tin or silver. Such parts are rarely purchased for household appliances due to the high price.

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To summarize, changing brushes is an important part of maintaining your angle grinder. Inattentiveness in this regard can lead to more serious damage, such as destruction of the armature collector plate. When replacing, it is important to properly disassemble and assemble the mechanism, along the way lubricated its main components.

When deciding which brush is best in a particular case, it is better to refer to the instructions or those passport of the device. If you have additional questions, it makes sense to seek advice from the service center.

Washing machine sparks. what to do

  • We find out the essence of the problem and its location
  • Washing machine engine sparks
  • How to replace brushes without disassembling the motor?
  • The motor sparks due to breakage of the collector lamellas
  • Heating element arcing

An automatic washing machine is a complex modern device with a large number of all kinds of components. Naturally, it can emit noises during operation, and we are not talking about noise during spinning at all. But sometimes you can hear uncharacteristic sounds, crackling, it also happens that the washing machine sparks.

It is very important! If you find that your irreplaceable assistant has begun to spark, do not waste time, immediately disconnect the household appliance. It is very dangerous to use equipment in this state. It could lead to fire.!

If the washing machine sparks, this is a 100% sign that it is broken. Do not joke with this business, do not think that the problem will disappear by itself with the next wash. It doesn’t happen.

We find out the essence of the problem and its location

A malfunction in the form of sparking can be associated with breakdown and failure of various components. Most often, sparks can be seen during the final spinning phase under the drum at the back of the washing unit. Where the engine is. Sparks are accompanied by a crackle. Sometimes you can even see “fireworks” If you sniff, you can hear the smell of burning and burning plastic.

Sometimes the upper part of the case, in the area of ​​the control panel, can also sparkle, but this happens much less often. Usually, after such arcing, the equipment does not turn on or turns on, but does not respond to commands.

They ask us: “What to do: they called the service center, and the masters laughed and said that everything is in order, can it be so?”

Can. Sparking is the norm in two cases. It so happens that your old and kind washing machine has recently changed the brushes in the engine, or the engine itself. The machine can also spark if you recently bought it. New equipment just goes into operation.

In the two cases described, the engine brushes sparkle, which rub in. When assembling or repairing a unit, they are installed correctly, but the collector and brushes should still rub against each other. To make this happen as quickly as possible, try not to overload the drum at first, or even better load it by a quarter or half, set the average spin speed, it is not necessary, if your machine is spinning at 1600 rpm, set that much. And in general, such a spin speed is more of a marketing ploy. 1000 rpm is usually enough to spin the laundry.

If the sparks did not appear after replacing the brushes, you are faced with a malfunction. Let’s look for a reason!

If you are experiencing sparking, it is most likely due to the engine, but not always. Let’s figure out why it sparks!

Stock up on screwdrivers, pliers, and wrenches. We will need these tools in order to gain access to the internal components of the unit.

Remove the back cover and take a close look at the motor, control board, and wires that go in different directions. Indeed, sometimes there is a short circuit to the case or damage to the insulation of the wiring. If the source of the spark cannot be found immediately, start the wash and carefully inspect the components. The following elements may sparkle during washing:

  • Heating element,
  • control module,
  • sparkle brushes,
  • there was a breakdown of the lamellas in the motor manifold.

How to replace brushes without disassembling the motor?

Older motors are designed with the brushes and mounts inside the motor. In this case, the body will have to be unscrewed, the brushes replaced, and then collected in the reverse order.

Remember to assemble correctly. To do this, mark with a marker, put all the bolts and fasteners in one place, you can take a photo of the location of the elements before, so as not to puzzle over how to assemble it correctly and how it was. Everyone has smartphones with a camera, so this is the most affordable method. If you don’t have a camera at hand, you can sketch using a sheet of paper and a pencil.

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New motors do not need to disassemble anything to replace the brushes. The brush holder is also visible from the outside. In this case, the brushes are simply unscrewed with a screwdriver and the fasteners are pushed off with a flat screwdriver.

Washing machine engine sparks

If the washer sparks at the bottom, it is most likely the motor driving the drum. There are two types of motors: inverter and collector. An inverter motor is a modern version, and in machines of the past years of production there are motors with brushes. Brushes wear out over time. Don’t be upset. This problem occurs sooner or later. Earlier. if you like to wash often and at the maximum spin speed, later. if you spare your equipment and follow all the manufacturer’s recommendations regarding use. Average service life of brushes. up to 7 years.

Why do you need brushes? These elements transmit an electrical impulse to the rotating collector. Brushes can be carbon or graphite. High drum speed leads to wear on the brushes. Because of this, contact with the collector lamellas worsens, sparks and an unpleasant odor appear. The more wear and tear, the more these elements begin to spark.

The solution to the problem is very simple. To do this, it is enough to replace the brushes. The motor can then continue to run.

How to replace brushes?

  • Unscrew the back cover.
  • Remove the drive belt from the pulley.
  • Disconnect the power terminals.
  • Unscrew the engine mounts.
  • Pull out the engine carefully. At this stage, the washing machine tank, to which the motor is attached, can interfere with us. Have patience, you need quick wits. and the motor will be solemnly removed.

After the engine is pulled out of the washer, the problem can be solved in two ways: with disassembling the motor, without disassembling the motor.

The motor sparks due to breakage of the collector lamellas

If the machine sparks at the bottom, breakage of the engine lamellas is another possible cause. Additionally, you can hear a strong crackling and extraneous sound. The noise increases during the spinning stage and becomes simply unbearable when the tank is loaded with a large load and washing at maximum speed.

Lamellas are a malfunction also associated with the engine. This part is the contact surface of the collector, which rubs against the brushes. As the drum rotates, the lamellas heat up and lose their smoothness over time. If the machine is not allowed to rest, run several washing cycles in a row, overload the drum, the lamellas overheat and the process of their destruction begins.

Some of the plates may even wear off, others will form carbon deposits. Because of this, poor contact with the brushes occurs and, as in the previous case, sparks, crackling, and also the sound of brushes on the contact surfaces appear.

This failure can be diagnosed by turning the drive shaft by hand. With strong wear of the lamellas, you will hear clicks and sounds that a serviceable motor never makes.

If the lamellas are slightly damaged, it is enough to clean the carbon deposits and polish them with felt. It can restore the smoothness and uniformity of the contact pad.

Heavily worn lamellas cannot be restored. In this case, you will have to change the engine, since manufacturers do not produce a separate collector and other engine parts.

Heating element arcing

So, if the washing machine sparks while the engine is running, then it is in this unit: in the brushes or in the lamellas. But sometimes the engine has nothing to do with it. For example, in a washing machine, a tubular heater can easily sparkle. In some models of washing machines, such sparks can be seen even through glass.

angle, grinder, sparks, changing, brushes

If you saw that the heating element sparked. try to de-energize the equipment as soon as possible and do not touch the body with your hands so as not to get an electric shock.

Then remove the back cover of the washing machine. Armed with a multimeter, find the contacts of the heating element. There are only 3 of them. The one in the middle is grounding. Put the meter in buzzer mode. Next, you need to attach one probe of the multimeter to the extreme contact, and the other to the middle one (or to the case). In a normal state, the device will not beep, if you hear a squeak, then a breakdown has occurred.

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The broken heating element must be replaced. This item is not repairable.

The control module can also spark due to power surges. In this case, you will see sparking from above, not below. The fact that the control unit has burned out, you will be notified by an error code. Usually, after such a malfunction, a module replacement will be required.

So, now you know for what reasons sparks appear in the washer. We recommend that you follow the operating rules, do not overload the drum, do not wash at maximum speed, and also use a surge protector and RCD.

Minor breakdowns and their elimination

In cases where the angle grinder refuses to turn on when the start button is pressed, the reason may be insignificant and, most likely, the repair can be done by yourself without the help of a specialist. In this case, you need to be guided by the main rule. start with the simplest nodes and move to more complex ones. In this case, the cause of the breakdown of the angle grinder may be a break in the wiring in the section of the power wire and brushes.

First of all, it is necessary to disconnect the angle grinder from the mains, and then inspect the cable for damage. After that, you need to disassemble the case and check the connection of the power button and brushes. If the wire is damaged, it can be replaced with a new one, and the broken electrical circuit can be restored. If, after checking the cable and electrical circuit, the current flows to the mechanism, but the start is not performed, then the problem may be in the start button itself.

Check the button and, if a fault is found, eliminate it or replace the button. The button must be carefully disassembled, while it is advisable to mark the terminals and wires. When reconnecting, it is important to correctly connect the contacts, since incorrect installation can cause the winding to burn out and the armature to jam.

After checking the operation of the power cable and the button, you need to check the speed regulator, which is available in some models of the angle grinder. If no faults are found, then you need to pay attention to the brushes and, if necessary, replace them, as well as clean all the contacts.

Electrical diagram

Knowing the purpose of the main parts will not give a 100% positive result in the repair. It is also necessary to understand and understand how the electrical circuit of the angle grinder is arranged and how the electric motor works. The circuit uses two windings, which are sequentially connected through a power wire to a network with a voltage of 220 V and are not interconnected in an electrical circuit. A mechanically installed switch is associated with the on and off button of the grinder. Each of the windings is connected via contacts with graphite brushes. Through the brushes, the windings are connected to the rotor collector.

It is also very important that the armature has many windings, however, only two windings are connected to the graphite brushes, and failure most often occurs due to a break in the electrical circuit. Diagnostics of the electrical circuit of the device is carried out with a special device. a tester. The portable measuring device is used not only for repairing an angle grinder, but also for checking other electrical tools and devices.

Correct check should be done from the input power cable with the transition to the series connected elements. When testing conductivity, the multimeter switch is set to minimum voltage.

Malfunctions of the electric circuit of the collector motor

Most often, breakdowns in the electrical circuit of an angle grinder occur for the following reasons:

  • Collector wear;
  • Breakage of the start button;
  • Wear on carbon or graphite brushes;
  • Overheating and short circuit in the stator winding;
  • Overheating and burning of the rotor winding;
  • Damage to the power cable.

Such malfunctions are the most frequent, but there are other breakdowns associated with an open circuit.

Dismantling and repair of the gearbox

The hardest part when repairing a gearbox is removing the gears and removing the thrust bearing. For disassembly, it is necessary to remove the cover and disconnect the stator housing from the rotor. Next, you need to unscrew the drive gear nut, if provided by the design. There is a bearing in the gear cover, which is pulled out after removing the circlip. The large driven gear is attached with a retaining ring, and it can be removed with the help of available tools. The gear is pressed onto the spindle and secured with a key.

In some types of angle grinder, the gear can be fastened with a screw connection. Repair of gears consists in replacing them. A locking latch is required for the convenience of flange mounting of the working disc. The retainer is a rod with a spring and, if necessary, by pressing on it, prevents the rotation of the working shaft. Such a retainer is almost impossible to repair, it must be replaced.

Collector inspection and repair

To inspect the collector, it is necessary to remove the rotor, while disassembling the housing and the gearbox. When grooves are found on the manifold, it is turned on a lathe, and minor damage is repaired by grinding. For grinding the surface of the collector, the rotor shaft is fixed in the drill chuck, and grinding is done with glass paper. When carrying out grinding and turning work, beating and displacement of the center of the workpiece are not allowed, and before work it is necessary to remove the bearings from the rotor shaft.

After work, you need to clean the surface with a soft cloth and remove burrs on the lamellas.

Replacing the gearbox bearing

Bearings are very important parts of a power tool. After a bearing breakdown, it must be replaced immediately, as its failure can lead to other mechanical failures and damage to the stator and rotor. Bearings can be adversely affected by:

angle, grinder, sparks, changing, brushes
  • Long-term operation of the angle grinder with high load;
  • Lack of lubricant;
  • Ingress of foreign particles;
  • Increased rotation speed.

Unpleasant abnormal noise occurs after bearing wear or destruction. You can check the condition of the bearing after disassembling the angle grinder and checking the bearing play on the shaft. When swinging the bearing in different directions, the backlash should be absent or minimal. After detecting bearing malfunctions, it must be changed using a puller, and the collar of the destroyed bearing can be removed using a tap screwed into the cage. You can also remove the bearing according to the folk method, using two open-end wrenches, a vice and a hammer.

Grinder rotor repair

In most cases, repairs are made after improper use. This can be constant overheating, excessive loads, untimely replacement of brushes and the ingress of foreign particles on the collector plates. It is possible to determine the malfunction of the rotor of the DWT 180 angle grinder by increasing the spark on the collector lamellas, the appearance of a smell of burning and smoke. Such consequences can be caused by a gearbox malfunction, accompanied by a knock and hum as a result of destroyed teeth.

To prevent damage to the rotor, prevent overheating of the angle grinder, clogging of the ventilation ducts and the ingress of dust and other particles into them. It is necessary to change brushes, lubricant in time and use circles of the diameter provided by the instruction manual.

Motor short circuit

The most unpleasant thing that can happen to a vacuum cleaner motor is an inter-turn circuit in the winding. As a rule, sparking in this case occurs in a circle, engine speed drops, pops are possible, collector plates have significant blackening. In this situation, you are in danger of replacing the entire motor, because the cost of an armature can be 70-80% of the cost of the entire electric motor, and rewinding in domestic conditions is not an easy task.

Eliminate pollution

The surface of the collector must be clean at the point of contact with the brushes. Coal or metal dust generated by rubbing the brushes against the rings or the collector can have a detrimental effect on the contact. Contamination of the latter causes sparking, from which carbon deposits are formed. Self-repair of the vacuum cleaner in this case involves routine cleaning. If the surface has traces of contamination, it is necessary to get rid of them with a fine sandpaper, and then degrease by wiping with alcohol or gasoline. You should also pay attention to the space between the contacts on the rotor. If they are clogged with dirt or graphite dust, they should also be cleaned and degreased.

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The principle of operation of the collector motor

The main elements of the device are located in rotation bearings, which, in turn, are enclosed in a static frame. Both the motor and the stator have individual windings from insulated conductors. armatures. An electric current flows through the latter, and, as a result, magnetic fields are formed with the north and south poles (N and S).

Due to their interaction, the dynamic part of the motor, the rotor shaft, rotates. A collector with a brush mechanism and anchors is just needed in order to supply the necessary voltage to the windings, due to which the shaft rotates.

Why sparkle brushes in a vacuum cleaner

Slight arcing between the brushes and the collector is normal. It is quite another matter if the former directly “spew” sparks. Increased sparking of the brushes in the electric motor of the vacuum cleaner indicates a malfunction that can significantly reduce the life of the device. The phenomenon may be accompanied by a loss of engine power, uneven operation, overheating and other malfunctions. About why the brushes of the vacuum cleaner sparkle. and what can be done, we will tell in this publication.

Eliminating bad contact

Often brushes spark when poor contact with the collector. This happens if you have installed new ones. For a more snug fit of the brushes to the collector, you can use a “skin” zero, or just let the vacuum cleaner run at medium speed for about 20 minutes. It is imperative to check the condition of the bearings, as their wear can cause runout and uneven rotation of the rotor. Insulation protrusions between the collector plates, scratches on the surface, and various irregularities manifest themselves in the same way. Use abrasive paper for polishing.

The device of the collector motor of the vacuum cleaner

The brushes should not dangle in the brush holder, but have free travel, which is provided by a spring, the state of which also plays an important role.

If you decide to replace the brushes, be sure to pay attention to how tightly the spring presses them against the manifold. Sometimes, in order for the brushes to press harder, it is enough to stretch the spring a little.

Engine diagram

For a more visual understanding of the principle of operation of a brushed motor, there are two visual types of presentation. simplified and detailed. The first format (Fig. Below) is a conventional diagram that focuses on connecting the windings to the network.

complex designs (fig. Below) have additional taps on the rotor and stator. For example, for powering automation or speed control. The presence of thermal protection allows you to minimize the likelihood of overheating of the upper layer of the winding of the unit. This element removes the voltage when the relay is activated, stopping the operation of the shaft.

The tachogenerator reflects the engine speed. Alternatively, some models are fitted with a Hall sensor. The device receives signals through the contacts of the manifold panels.

Replacing brushes

The simplest and most obvious cause of sparks is brush wear. Despite the fact that the collector motors are equipped with special spark-suppressing capacitors, which, in addition to increasing the service life of these elements, also reduce radio interference, over time the brushes wear out and must be replaced.

To replace the brushes, you first need to get to the electric motor. To do this, you will have to disassemble the vacuum cleaner. In most cases, it is quite easy to do this with a screwdriver, but remember to unplug the appliance. Having disassembled the vacuum cleaner and providing convenient access to the engine, we find the brush holders. Depending on the design, to remove the brushes from the brush holder, you usually need to pull back the latches, for this you may need a screwdriver.

When buying new brushes, you need to pay attention to their size and material.

Why brushes sparkle

Brushes can be called the weakest element of a collector motor: at the time of operation of the unit, they are subjected to constant friction, which leads to their wear. This moment is especially noticeable on copper surfaces, where a layer of coal dust accumulates during the operation of the brushes.

Dust in contacts

With regular work, even at low speeds, the brushes of the screwdriver are erased. As a result, graphite dust is formed. It accumulates on the contacts of the electric motor. And since graphite dust has its own resistance, an uneven distribution of current occurs, sparks appear, a characteristic smell. a complete feeling that the brushes are burning at the screwdriver.

If the brushes are installed correctly, they will wear out very slowly and do not lead to such problems. Take apart your instrument and see what happens there. Consider:

  • parts of the mechanism must fit tightly, without backlash;
  • if a replacement was made, a brush of an inappropriate size may have been installed;
  • foreign objects, dust, building chips could get into the grooves.

Gently remove dust from the brushes, from the grooves using a pointed tool. To prevent further sparking, replace or firmly reinstall all necessary parts.

For replacement, buy original parts from the manufacturer. In the end, it will save money and nerves.

Possible reasons

The main reason sparks appear even on a new engine is the mechanical interaction of the collector and brushes. Moving during tool operation from one collector contact to another, the brushes alternately create and break contact with each of them.

angle, grinder, sparks, changing, brushes

To make it easier to understand the principle, remember the situation when you pull out the plug of an electrical appliance from the outlet. When the circuit breaks, a spark is generated between the outlet and the plug. So it is in this case. Slight arcing is normal.

But if the sparks fly in a sheaf, this situation may be due to the following reasons:

  • collector contacts in carbon;
  • graphite dust from the brushes got between the contacts;
  • a short circuit occurred in the armature winding.

Collector contamination

The mechanics of collector contacts contamination are as follows: the electric motor overheats, carbon deposits settle on the collector, which creates additional friction. As a result, the engine overheats again, even when running at low rpm, the amount of carbon deposits increases, friction increases. and so on until the engine burns out at all.

The solution to the problem is obvious and consists in cleaning up contacts. Do it with the finest (zero) sandpaper:

  • Remove the manifold with an anchor.
  • Lightly sandpaper the contacts.
  • Reinsert the module.

It is best to clean with a lathe to avoid disturbing the geometry of the part. But in practice, you can get by with manual work.

Anchor closure

If you cleaned the collector contacts, checked the condition and tightness of the brushes, and the arcing of the electric motor continues, most likely the problem is in the armature winding.

A special device for creating an alternating magnetic field helps to detect it. If you place an anchor in it, it will start to rattle, since induced currents appear in it.

If a problem is found in this module, rewinding the winding or complete replacement of the armature will help.

Whatever the reasons for the appearance of sparks in the power tool. contamination of contacts, a short circuit in the armature or clogged brushes. they cannot be ignored. Otherwise, you can wait for the final failure of the screwdriver.

Why do the brushes sparkle at the screwdriver and what to do about it?

If the screwdriver sparks with rare and small sparks, this does not necessarily indicate a malfunction. A newly purchased tool can behave this way in the first 10-15 minutes of work, while the brushes are rubbing in. If enough time has passed, and the sparking does not stop, it is better to return the screwdriver.

But what to do if the problem manifests itself after years of operation of the power tool, and the warranty period has long expired?


To prevent or at least minimize the risk of all these problems, follow a few simple rules:

  • after work, wipe the tool and screwdriver bits you used with a damp cloth. This will prevent dust from getting inside, on the collector contacts;
  • if the resource of the screwdriver is not enough for your tasks, do not lean on it and do not press it into the surface. Purchase a tool with the appropriate power and number of revolutions;
  • use original spare parts to replace broken ones. This will protect the tool from premature global breakdown.

Preventing a problem is always easier than looking for a solution later.