How to check the anchor of a chain saw. If there is no ohmmeter?

Checking the anchor for an interval circuit

Electric machines consist of a rotor and stator. The stator is fixed windings laid in the case. An anchor is a mobile part, therefore, as a rule, particles of dirt and lubrication fall on it and an oxidized plaque forms under the influence of temperature. It can cause faulty operation or failure of the Rotor of an electric machine. It is found by a visual inspection. Narar can cause an interval circuit in anchor. As such, the rotor of the electric motor under normal operating conditions does not wear out. Over time, only the current.cooping brushes are subject to replacement if their length does not correspond to the permissible size. However, long loads cause the heating of the stator windings, which as a result contributes to the formation of soot. Interpretation of the anchor can happen with mechanical damage. The presence of chips, dents, scratches and cracks is unacceptable on the rubbing surfaces. The closure between the turns of the anchor windings occurs in the case of leaving the bearing nodes. Then the anchor is overwhelmed, which leads to damage to the lamellas. Another reason for the closure is the effect of moisture. When water drops hits on metal surfaces, the corrosion process begins. The rust makes it difficult to rotate the anchor, the current loads are growing, the percentage can be excluded as a result, which in turn can lead to interval circuit during prolonged operation.

It is possible to diagnose this malfunction at home. Carry out this procedure using an inductance coil called a throttle.

Using this device, you will be able to find out the direction of reset, as well as the order in which the coils of the winding are connected to the collector lamellas.

Thus, the anchor is checked for the interval circuit.

It is not at all difficult to make such a device with your own hands, it’s enough to get acquainted with our instructions.

Allocating roles from the admin panel

For assembly of the device. It will require P. figurative transformer iron. It can be removed from a vibrational pump like baby.

We disassemble the structure and remove P. figurative transformer iron.For this, the lower is the lower part of the pump. so that the polymer, which floods the coil, melted.

Next, using the improvised tool, cut the edges on the transformer gland, as shown in the photo. When processing, remember that the iron is puff, so all operations must be carried out carefully so that the bully does not form. After on the sandpaper, we remove all the sharp edges on the product. This is necessary to maintain the integrity of the enamel supply.

It is not necessary to observe the strict size of the angles, the main thing is that the anchors of different sizes are easily located in the prepared place.

The next action will be the manufacture of coils. To win the size of the device and the throttle did not turn out to be too bulky, we will make not one, but two coils that will be placed on both sides of the P-shaped iron. For this you will need:

We measure all sizes of the P-shaped transformer iron in their maximum values. Next, we transfer them to cardboard and draw a scan of the body of the future coil. In this case, it is necessary to take into account the size of the groove of the core. Next, the stupid end of the scissors is drawn along all lines of excess. This will help to bend cardboard without problems. Cut the scan. In the same way we make a pattern to the other side. Now we need to prepare lids for coils. There are 8 of them. We mark the blanks for the covers on the cardboard. We cut out the outer circuit with scissors, inner with a sharp knife.

Next, glue the covers with prepared scanes and get two skeletons of future coils.

Now you need to wind the wire to the coils. To do this, we will use the calculation of the transformer. First, we determine the area of ​​the cross.section of the core by changing its length and width. In our case, the area was 3.7 cm x 2.2 cm = 8.14 cm 2. Next, divide 13200/8.14 = 1621 round. We round this amount to 1700 turns and equally distribute between the two coils, it turns out 850 turns. This amount can be wound without problems manually. At the same time, an error of 20-40 turns will not affect the result. But it’s still better to make a mistake towards the increase. Before winding, it is necessary to make holes into which the ends of the wire will exit. A heat.assembly cambric is put on the free end of the wire. The end of the wire is inserted into the hole and then the winding process is ongoing. At its end, we solder the wiring with Cambrick to the other end and insert it into another hole. Just so wound the second coil.

After. How both coils are ready. We put them on P. a figurative core. In this case, the outputs of the wires should be located below on one side. Important. so that the coils are wound identical. The turns are directed the same. and their endings are bred in one direction. This is followed by the connection of induction coils and the supply of network voltage (220V) to their ends.

Checking the inter.seal circuit using analog tester

However, you can check the anchor for an interval circuit with a multipher. In this case, it will only be possible to find out there is a cliff in the anchor windings or not. An analog tester will be a more accurate device. With it, we measure the resistance between each two lamellas. It must be identical. After installing the device for 200 kOhm, one probe is closed to the mass. and we apply the other to each lamella. If the anchor does not call the mass, then it is most likely serviceable or it must be checked using a throttle.

To detect an inter.flood closing of the anchor, you can use a simple indicator that can be assembled according to the scheme below.

In order to solder such an elementary indicator, you will need a little money, free time and your hands.

We purchase 5 transistors, 8 resistors, 4 capacitors, 2 LEDs and battery. In addition, we independently wrap two coils.

Prepare a printed circuit board and collect the device. It is very convenient to check the interval circuit using such an indicator. A weighty argument in favor of the device is that it can be without problems by finding an interval circuit and on the strata as indicated below in the video.

Briefly about the device of corner grinders

corner grinder or angular grinder (angular grinder). is used in construction operations when it is required to carry out the processing of solid building materials: stone, metal, wood and others.

The main part of the corner grinder is the electric engine that can function both from the domestic source of alternating current 220 V, and from the battery. The electric motor consists of 2 elements: electrostator and rotor. The latter rotates when operating the engine, therefore it is also called an anchor. In order to correct the corner grinder, you will need to check the stator and rotor separately.

Preparing the tool for testing

If, while pressing the trigger button, the angular grinder does not turn on, and the electric motor does not rotate, then the rotor and the electric engine are checked.

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

Visual inspection

Quite often, the corner grinder still starts, but its characteristics are no longer consistent. In almost half of cases, this is due to a burnt rotor. It is possible to identify this visually without opening the body when:

  • During operation, sparking was found on the collector.
  • During the launch, the corner grinder may occur stressing voltage in the house network.
  • Engine operation is accompanied by jerks.
  • The smell of burning wires is released from the engine body.
  • The tool does not develop speed, and works with low power.

Important! Similar signs are manifested with wear of brushes. After their replacement, these malfunctions in the work are damaged. If this is not the case, then the anchor is still the fault of the failure.

When the anchor is not operational, the engine is overheating. The insulating coating of wires begins to melt, which ultimately leads to a short circuit between them. Then the process of soldering electrical contacts begins, which connect the rotary windings and plates. The current is not supplied to the electric motor, and the corner grinder becomes inoperative. The stator of the corner grinder is often the reason for its failure.

Dismantling corner grinding

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

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

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

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

Methods of verification

Each rotor malfunction is revealed by the corresponding verification method.

Visual inspection

A method of verification with which you need to start diagnostics. Check the anchor collector for the presence of mechanical damage. Scratches, bullying and chips should be absent. Inspect the lamellas for burnout. If one of them is darker or fluttered, there is a short circuit between the plate and the winding tire.

12-volt light bulb

Connect two wires to the lamp contacts. In one of them make a gap. Connect the wires to the power source, put the edges of the “torn” wire on the lamellas so that they do not come into contact with each other. Rotate anchor. If there are no holes in the winding, then the light will burn continuously.


Put this device into the resistance measurement mode. One of the probes (polarity does not matter) put on one of the plates. Another probe is alternately applied to the rest of the lamellas. The sound signal, depending on the multimeter model, will notify that there is a breakdown between the “winding tracks”.


Indicator of short.closed turns. Used in the diagnosis of closed anchors. This type of rotor is characterized by the lack of access to the location of the winding with the lamellas. The tester has two LEDs. red and green. Rotating the anchor connected to the tester, you can determine the presence of a breakdown in the winding on the tanned red LED.

How to eliminate the malfunction?

Visual inspection and conduct of tests will help determine the nature of the malfunction and understand whether replacement or repair is possible at home. Failures of the rotor of the corner grinder are divided into two types: amenable and not amenable. The first type includes malfunctions associated with violation of the insulation of the winding, damage to the collector and the iron base. The second type of breakdowns. factors of deterioration in the balance of the anchor in general and its shaft. It is almost impossible to restore the rotor in this case.

Collector repair

If structural damage to the collector lamella is detected, they must be proceeded. You can do this on a lathe or using improvised means. The groove should be carried out evenly. Otherwise, balancing will be violated, which will entail the destruction of graphite brushes during operation and failure of other components of the corner grinder.

Machine groove

The rotor of the corner grinder is installed in the lathe. Since the collector consists of copper plates, and copper is a viscous metal, it is necessary to choose the optimal rotation speed in the range from 600 to 1200. The cutting of the cutter is carried out half the division. At the time of touching the “knife” of the collector, a longitudinal passage is made with the removal of a thin layer of metal. To achieve the best effect, you can make 2-3 passes. Their larger number can lead to damage to the structural integrity of the collector. Between the aisles you need to take breaks, giving copper to cool. Otherwise, varnish isolation between the lamellas may melt.

For grooves with the help of improvised means you will need a vice, drill and several types of sandpaper. The anchor of the corner grinder is extracted from the case, while one part of it remains connected to the gearbox angular grind. The gearbox body is fixed in a vice, the other end of the rotor shaft is clamped in a drill cartridge. The “lips” of the vice and the drill should be on the same line with the axis of the anchor shaft.

Turn on the drill with fixing the start button in the mode of constant operation. Wipe the collector without pressure. Use at least 3 types of granularity. from larger to smaller. The final should be the sandpaper of zero granularity.

At the end of the groove, it is important to remove all the chips and dust from the collector, this will prevent the occurrence of a short circuit between the plates.

Remove the bearing

The edge that is fixed in the drill cartridge is initially installed in the bearing. Before the groove, it is necessary to remove it. In order to remove the bearing without a puller, you can use a vice, hammer and chisel. Fix the shaft with the bearing in the vice so that only the bearing is squeezed. Install the sharp end of the chisel in the end of the shaft and remove the shaft from the bearing with the light beats of the hammer.

Winding repair

Rewinding of the anchor of the corner grinder. work requiring the presence of appropriate skills and special accuracy. To achieve the best final result, you should contact the relevant specialist.

Non.standard check

The most accurate way is to check the stator using a metal ball and a lowering current transformer. The stator is connected to the conclusions of three phases from the transformer. Having checked the correctness of the connection, we turn on our circuit with a reduced voltage to the network.

We throw the ball into the stator and observe its behavior. If he “stuck” to one of the windings. this means that an interval circuit has occurred on it. The ball is spinning in a circle. the stator is working. Quite an unscientific, but effective method of detecting interval circuits at the status.

How to Diagnose a Bad Cord or Power Switch

Rotor malfunctions

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

The corner grinder will work, but the plates quickly wear out, and over time the engine breaks. To avoid breakdowns, it is necessary to check the tool and maintain normal service conditions. Moisture when it hits metal causes rust. The friction force increases, the current strength is required more for work. There is a significant heating of the contact groups, solder, a strong spark appears.

How a malfunction diagnosis is carried out?

Checking the anchor of the electric motor begins with the determination of the malfunction itself. A complete breakdown of this node occurs due to the scattered brushes of the collector, the destruction of the dielectric layer between the plates, in addition due to the short circuit in the electronic circuit. If the sparking passage of the snuts of the device decides to wear out on a different damage to the current collectors.

Sparkling of brushes begins due to the occurrence of a gap at the point of contact with the collector. This is preceded by the fall of the device, the highest load on the shaft during jamming, also violation of the integrity of the solder on the conclusions of the windings.

The malfunction on the working electric motor is manifested by the usual states:

  • Coming the main sign of malfunction.
  • Rock and friction when rotating the anchor.
  • Tangible vibration during operation.
  • Changing the direction of rotation when the anchor of the movement line passes the least turnover.
  • The occurrence of the aroma of melting plastic or severe heating.

What to do when the listed deviations appear in the work?

The speed of the anchor of the electric motor is supported by the constant. At idle, the malfunction may not manifest itself. Under the load, friction is compensated by an increase in the current flowing through the windings. If the differences in the work of corner grinders, drills, starter are noted, then it is necessary to remove the voltage supply.

The upcoming operation of devices leads to a fire differently to the defeat of a person with electronic current. The most important thing is recommended to look at the case of the product, evaluate the wiring at the integrity, the absence of melted parts and damage to the insulation. For touch, inspect the temperature of all parts of the device. They try to twist the anchor with his hand, it must move simply, without jamming. If the mechanical parts are intact and there are no pollutions run for disassembly.

check, anchor, chain, there

How to check the anchor of the corner grinder for serviceability

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.

check, anchor, chain, there

How to check the anchor if there are no special tools

If there is no way to use special devices, you can check the contacts with a 12-volt bulb. It is inserted into the gap, after which the voltage from the battery is supplied. If everything is in order with the anchor, it will light up and will not go to bed.

In cases where the light does not shine, you will have to look for a rupture of the contour or a short circuit in the stature.

How to check the rotor of the corner grind

  • 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.

This procedure is similar to a multimeter diagnosis.

Asynchronous engines

Asynchronous electric motors are widely used not only in industry (on machines, compressors, pumps), but also in everyday life (in refrigerators, washing machines of some models). With their malfunction, a visual inspection should begin with the stator windings playing the role of an anchor.

Before the anchor of the electric motor, it is necessary to check other nodes and parts (since the cause may be damaged). connection cables, magnetic starters, thermal relay, capacitor, and also check the presence of voltage. If everything is in order, make sure that there is no power supply and disassemble the engine.

The reasons why the stator windings cease to work are most often as follows:

If the problem is not detected during the inspection, further diagnosis is carried out using a multimeter. In the units of 380 V, which are connected by a “triangle” or “star”, each winding is checked separately. Deviation of the resistance value on them should be no more than 5%. Then the windings are nicknamed the case and with each other. Resistance should strive for infinity, other indications indicate that there is a breakdown of windings between themselves or on the case. This problem is solved by complete rewind.

In 220 V electric motors, it is enough to call the working and launch windings enough. The first resistance should be one and a half times lower than that of the second.

The most difficult stage of the check is the search for inter.flip circuit, since it is not possible to identify it with a visual examination. You need to use the special meter of inductance. If the value on all windings is the same. there are no problems. The lowest value on any of the windings indicates its damage.

The insulation resistance of the windings is checked by a 1000 V megammeter, which is connected to a separate power source. One wire is connected to the unit case in a place that is not painted, the other to each conclusion of the winding alternately. The value should be more than 0.5 MOM, a smaller indicator suggests that the engine must be dried. When conducting measurements, try not to touch the wires and be extremely careful. In order to avoid accidents, de.energize the engine and strictly observe all precautions.

Now you know how to check the anchor of the electric motor by the tester, and you can, without involving a specialist, identify the cause of the problems and eliminate it by saving money and time.

How to call the electric motor multimeter

The most common electrical device in the household is the multimeter. With its help, you can call the integrity of the winding and the lack of breakdown on the body.

It is necessary to call the launch and work windings. over, the start.up resistance will be 1.5 times more than working. In some electric motors, the starting and working winding will have a total third conclusion. Read more about this here.

For example, the engine from the old washing machine has three conclusions. The largest resistance will be between two points, which includes 2 windings, for example 50 Ohms. If you take the remaining third end, then this will be the general end. If you measure between it and the 2nd end of the starting winding, get about 30-35 Ohms, and if between it and 2 ends of the worker is about 15 Ohms.

In the engines for 380 volts connected according to the scheme of a star or triangle, it will be necessary to disassemble the circuit and call each of the three windings separately. Their resistance should be the same from 2 to 15 Ohms with deviations of not more than 5 percent.

It is necessary to call all the windings among themselves and to the case. If the resistance is not great to infinity, then there is a breakdown of windings between themselves or on the case. Such engines must be handed over to the rewinding of windings.

How to check the insulation resistance of the electric motor windings

Unfortunately, the multimeter does not check the value of the insulation resistance of the electric motor windings for this, you need a 1000 volt meter with a separate power source. The device is expensive, but every electrician has it at work, who has to connect or repair electric motors.

When measuring, one wire from a megammeter is attached to the case in an unpainted place, and the second in turn to each conclusion of the winding. After that, measure the insulation resistance between all windings. At a size of less than 0.5 megoma- the engine must be dried.

How to find an interval closure

The most difficult is the search for an interval circuit, in which only part of the turns of the same winding closes with each other. It is not always revealed during external examination, therefore, for these purposes, it is used for engines for 380 voltages of inductance. All three windings should have the same value. With an interval circuit in a damaged winding, the inductance will be minimal.

Checking the electric part of the engine

Checking brushes

This applies to collector.type models. The fact that they are in place does not yet talk about the serviceability of the electric motor. These interchangeable contacts have a certain limit of wear, and its real value is visually simple to evaluate by their length. As a rule, permissible production. if the “height” of the brush is at least 10 mm. Although for a specific product should be clarified. But in any case, with suspicions of increased wear, it is better to replace them immediately.

Checking contact groups

There are lamellas on the rotor. Not only damage to any of them or detachment, but even a deep scratch is a sign of a malfunction. Perhaps the electric motor will work for some time, but how much and how is effective-a big question.

Checking windings

For this, they are excluded from the scheme. The technique depends on the type of email/engine. Conclusions can be soldered or “thrown away” by promoting fixing nuts. Otherwise it is impossible to test them for integrity. The windows of the electric motor are connected in a common circuit (“star” or “triangle”), and their testing in the original state is pointless. they will all “call”. Even with a break in case of short circuit.

On the integrity of the windings

In fact, each of them is a wire laid accordingly. All of them are connected to the diagram. Therefore, there should be only one “pair” from the conclusions. So you need to take any of them (having previously removed all the jumpers) and alternately, using the multimeter, “nickname” with the rest. If, when checking a specific output, the device shows icles all the time (when measuring resistance), then in this stator winding. an internal cliff. Definitely. for repair.

On the short circuit

The technique is identical, and there is no point in repeating the test. This is evaluated immediately, in parallel. It is only necessary to take into account that if some conclusion “calls” with more than one wire, then this means that between windings is a short circuit. The same. only in the workshop.

On a breakdown

In principle, similarly. The only difference is that when checking the insulation of the conductors, one probe probe is constantly on the electric motor body (preliminarily, a small “patch” from the paint should be cleaned), and the second is consistently attached to all conclusions alternately. If at least once the device shows zero resistance, then this conductor “shorts”. And in this case, you can’t do without repair.

Council of sometimes voltage of a multimeter battery is not enough. For such tests, an ohmmeter is more suitable. But for this, you need, firstly, to cheat with the passport data of the electric motor (according to the permissible voltage of insulation verification), and secondly, choose the device of the corresponding class. Blindly follow the recommendations for conducting such diagnostics for serviceability, otherwise it is easy to ruin the windings.

Diagnosis of the internal parts

The winding of the anchor of the electric motor should not have a carbon fiber, dark spots similar to the consequences of overheating. The surface of the contact parts and the gap should not be zosomeni. Small particles reduce engine power and increase current. Do not disassemble devices with a fork included in the network for the safety of work.

It is recommended to shoot the disassembly process to exclude difficulties in the reverse process. Or you can record every step of your actions on a sheet. Some wear of the brushes, lamellas is allowed. But if scratches are detected, it is necessary to find out the reason for their origin. Perhaps this was contributed to a crack in the case, which can be seen only at the load.

check, anchor, chain, there

Ommeter work

Sincere could occur due to the loss of electrical contact in one of the lamellas. To measure resistance, it is recommended to put probes from the current current. Rotating the engine shaft, observe the indications of the dial. There should be zero values ​​on the screen. If the numbers are slipping even in a few ohms, then this indicates a halter. When an infinite value appears, they judge the cliff in the chain.

Regardless of the results, then you should check the resistance between each neighboring lamellas. It should be the same for each measurement. In case of deviations, you need to inspect all the joints of the coils and the surface of the fit of the brushes. The brushes themselves must have uniform wear. With chips and cracks, they are subject to replacement.

The coils are connected to the core of the wiring, which could exfoliate. Solder often does not withstand blows from falls. At the starter, the current through contacts can reach 50A, which leads to the burning of low.quality connections. External inspection determines the places of damage. If they have not found a malfunction, then the resistance between the lamella and the coil itself is measured.

Interpreter close to the transformer

Transformers have a common malfunction. the closure of the turns among themselves. A multimeter is not always possible to identify this defect. It is necessary to carefully examine the transformer. The wire of the windings has lacquer isolation, with its breakdown between the turns of the winding there is resistance, which is not equal to zero. It leads to heating the winding.

When examining the transformer, there should not be a burning paper, bloating, bloating, blankets, blankets. If the type and brand of the transformer is known, you can find out what the resistance of the windings should be. The multimeter is switched to resistance mode. Compare the measured resistance to reference data. If the difference is more than 50%, then the windings are faulty. If the resistance data could not be found in the directory, then the number of turns, type and cross section of the wire, can be known, can calculate the resistance by formulas.

To check the transformer of the power supply with the release of low voltage, we connect a voltage of 220 V to the primary winding. If smoke, smell appear, then immediately turn off, the winding is faulty. If there are no such signs, then we measure the voltage by the tester in the secondary winding. With a 20% voltage, there is a risk of failure of the secondary winding.

If there is a second working transformer, then by comparing the resistances they find out the serviceability of the windings. To check in more detail, use an oscilloscope and generator.

Interpretation of the stator

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

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

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

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