How to check the rotor of an angle grinder The use of an angle grinder in everyday life is everywhere, and due to the harsh operating conditions of frequent use, the failure of the device is not uncommon. Tool repair most often consists in diagnosing failing units and replacing them or carrying out recovery measures. If mechanical breakdowns and increased output of the gear train are easy visually
Checking the performance of the anchor angle grinder
The angle grinder anchor is more strongly exposed to various electromagnetic, mechanical and temperature influences than other units, therefore it is the rotor that is most often the reason for the failure of the tool.
How to check an anchor on an angle grinder with improvised tools:
- A breakdown of the armature assumes two variants of malfunctions: breakage of current conductors on the lamella contacts, short interturn circuit in one or more windings. An electrician’s tester in the resistance measurement mode up to 200 Ohm makes it possible to detect breaks and complete short-circuiting of the winding (it will show an immensely low resistance), and in the resistance measurement mode of the order of 1 MΩ, the reliability of the electrical insulation of the windings of the working coils to the metal body of the rotor is checked.
- The absence of a pronounced short circuit in the armature windings does not completely disable the tool, but there is an increased heating of the engine, a decrease in its speed, which will eventually lead to a complete failure of the engine. Therefore, with any repair of the tool, it is imperative to ring the anchor of the angle grinder not only with a tester, but also check it with a specialized device that detects even minor short circuits.
How to check the rotor of an angle grinder
The use of an angle grinder in everyday life is ubiquitous, and due to the difficult operating conditions of frequent use, the failure of the device is not uncommon. Tool repair most often consists in diagnosing failing units and replacing them or carrying out recovery measures. If mechanical breakdowns and increased output of the gear train are easily detected visually, then in order to check the armature and stator of the angle grinder, specialized knowledge, skills and technical devices are required.
Checking the functionality of the stator
How to check the stator of an angle grinder with improvised means:
- The stator can have two main breakdowns – a wire breakage or the occurrence of short-circuited turns. At the same time, checking with a tester in the resistance measurement mode up to 200 Ohms is able to show only the absence of breaks with averaged resistance values, which should not differ between the phase windings.
- The absence of breaks in the stator windings can be determined with any low-voltage probe: a pair of wires, a battery, a light bulb. But, the presence of a short circuit in the circuit cannot be detected in this way, therefore, experienced electricians check experimentally: voltage is applied to the phase coils, while a metal ball is placed in the center between the poles of the windings, which, with normal windings, will look for the point of electromagnetic balance. The rotation of the ball indicates the absence of a short circuit in the coils, an offset from the center is a short circuit in the conductors on the opposite side.
- The stator of an angle grinder can be checked safely and accurately only with a professional device.
How to check an anchor on an angle grinder with a multimeter
Even if a man is not a professional craftsman, but simply as a good owner repairs everything in the house himself, he cannot do without a quality tool.
A large selection of grinders, screwdrivers and other tools is available on the site http://m-online.Kiev.Ua/category/158-bolgarki.Aspx.
Checking the anchor with a multimeter
In order to carry out such a check, you must disassemble the angle grinder and gain access to the anchor. The multimeter must be set in the 200 Ohm range, and touch two adjacent lamellas with the probes of the device.
We carry out measurements on all turns of the winding, if all the readings are the same, then the anchor is in good order. If on some loop the resistance values differ, then there is a malfunction. You should also check the body of the armature winding.
Visual inspection of breakage
Any, even the highest quality tool is prone to breakage. Especially if it is heavily exploited. In the event of a breakdown of the angle grinder, you are unlikely to be able to repair the tool yourself. However, a preliminary examination can be carried out without special skills.
Most often, the anchor breaks down in Bulgarians. The breakage can be mechanical. A visual inspection will show uneven wear of the brushes, as well as their burning. In addition, if the armature is faulty, the angle grinder will vibrate and heat up.
There are electrical breakdowns. These include:
- Damage to the armature winding;
- The presence of a short circuit in the turns;
- Broken resistance between the core and the winding.
Such malfunctions can be identified using special measuring instruments, for example, a multimeter.
Visual inspection of breakage
Any, even the highest quality tool is prone to breakage. Especially if it is heavily exploited. In the event of a breakdown of the angle grinder, you are unlikely to be able to repair the tool yourself. However, a preliminary examination can be carried out without special skills.
Most often, the anchor breaks down in Bulgarians. The breakage can be mechanical. A visual inspection will show uneven wear of the brushes, as well as their burning. In addition, if the armature is faulty, the angle grinder will vibrate and heat up.
There are electrical breakdowns. These include:
- Damage to the armature winding;
- The presence of a short circuit in the turns;
- Broken resistance between the core and the winding.
Such malfunctions can be identified using special measuring instruments, for example, a multimeter.
Checking the anchor with a multimeter
In order to carry out such a check, you must disassemble the angle grinder and gain access to the anchor. The multimeter must be set in the 200 Ohm range, and touch two adjacent lamellas with the probes of the device.
We carry out measurements on all turns of the winding, if all the readings are the same, then the anchor is in good order. If on some loop the resistance values differ, then there is a malfunction. You should also check the body of the armature winding.
How to check an anchor on an angle grinder with a multimeter
Even if a man is not a professional craftsman, but simply as a good owner repairs everything in the house himself, he cannot do without a quality tool.
A large selection of grinders, screwdrivers and other tools is available on the site http://m-online.Kiev.Ua/category/158-bolgarki.Aspx.
How to check the stator winding of an angle grinder at home in different ways
There are a large number of different electrical devices with which you can diagnose the stator. However, a limited number of technical means are used at home. Some are presented in the following.
Makita, without instruments
In one of the Makita models in the next while working smoke went, which is correct a sign of a burnt rotor or stator. To determine the reasons, the author completed a complete disassembly of the angle grinder, making it possible to perform a good external examination of the units suspected of malfunctioning the angle grinder. If no signs of smoke consequences were found on the rotor, then on the stator several places of burnt electrical insulating varnish clearly visible.
How to ring a stator angle grinder
408-317 Stator for BOSCH GWS7-125 / GWS7-115 HAMMER. Photo 220V
Stator as an element of the electric drive angle grinder participates in the creation of an electromagnetic field, in which the rotor rotates, creating a torque on the spindle shaft. During operation for a number of reasons, it fails. Execute damage diagnosis and stator repair user can independently.
- Device
- Causes of malfunction and characteristic symptoms
- Visual inspection for malfunction
- How to check the stator winding of an angle grinder at home in different ways
- Checking the armature / rotor and stator with a multimeter / tester
- On turn-to-turn closure, indicator
- Makita, without instruments
- Automatic multimeter: quickly and efficiently performs measurements
Checking the stator and rotor of power tools for interturn short circuit
It does not take much time to check the stator and rotor for turn-to-turn circuit with a multimeter. It will take longer to disassemble the engine. Angle grinder, drill, hammer drill, each tool can be repaired by identifying a malfunction. It is better to break the check into several main stages, and consistently slowly perform the actions.
Custom check
The most accurate way is to check the stator with a metal ball and a step-down current transformer. The stator is connected to the terminals of the three phases from the transformer. After checking the correctness of the connection, we turn on our low-voltage circuit into the network.
We throw a ball inside the stator and observe its behavior. If it stuck to one of the windings, this means that an inter-turn short circuit has occurred on it. The ball is spinning in a circle, the stator is working. A rather unscientific, but effective method for detecting an interturn short circuit on the stator.
Disassembly angle grinder
To check the short circuit on the stator and rotor, you need to disassemble the household tool motor. Consider performing this operation to troubleshoot an angle grinder.
- Remove the protective cover by unscrewing one screw on the clamp;
- Unscrew 4 screws and disconnect the gearbox with the motor from the handle of the angle grinder;
- Then, from the side of the gearbox, unscrew 4 bolts and disconnect the gearbox, together with the engine rotor;
- The stator remained in the case connected to the power and power button.
Having disassembled and disconnected the parts necessary for checking, we proceed to their external inspection, checking for turn-to-turn closure.
How to ring an anchor with a multimeter?
To complete this procedure, you will need the measuring instrument itself and tools to disassemble the device. How to ring an anchor with a multimeter instruction:
- Prepare your work surface. There should be enough space to place the necessary tools and parts removed from the device.
- Disassemble the angle grinder and remove the anchor.
- Clean the part from dirt and dust.
- Using the recommendations presented, you can independently ring the anchor with a multimeter.
At the initial stage of diagnostics, the value of the measuring device is set at 200 kΩ. If your multimeter does not have such a scale, then you can limit yourself to 20 kΩ. To ring the armature, one probe of the measuring device is applied to the ground, and the second is touched to each of the plates. If no indicators appear on the scale of an analog multimeter or a digital screen, most likely there is an interturn short circuit in the armature winding. You can accurately diagnose the problem using a special device that is available from professional locksmiths.
Checking the anchor angle grinder with a tester Possible diagnostic results
Among the most common causes of equipment failure, the most common inter-turn closure of the armature of an angle grinder. It can be detected by ringing with a tester. A multimeter is an electrical measuring device that includes the functions of an ammeter, voltmeter and ohmmeter. They can not only check the presence of a turn-to-turn circuit in the winding of the angle grinder, but also measure the resistance between the lamellas. A simpler device is a tester. By checking with it the armature of the angle grinder, you can detect malfunctions caused by a short circuit.