Causes of malfunction and characteristic symptoms

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In addition to the main application, the author shows a method for determining the connection points of the winding wires to the collector lamellas, in the absence of visually visible contacts.

Device
The stator of the angle grinder is a non-removable core made of sheet electrical steel. It has grooves in which the winding is twisted in a certain way , its wires are located parallel to each other, to reduce eddy currents.

The mandatory winding is covered with an insulating varnish to protect against possible short circuits between the wires. In the grooves of the cores between the coils, the insulation is made of electrical cardboard, glass tape and other similar materials . In the vast majority of grinding machine models, the stator is tightly installed inside a housing made of high-strength plastic, which protects the entire electrical part of the angle grinder.

The main factors influencing stator failure are the following:

The power supply network does not always guarantee stable voltage; voltage surges are possible;
When the power tool is operating, any liquid, such turkey telegram data as water, may enter the stator;
When processing certain materials (concrete, wood, etc.), an excessive amount of dust is generated, which is difficult to protect from getting on the stator winding;
Long-term operation of the angle grinder under overload conditions, causing overheating of the power tool;
During operation, do not stop the angle grinder by abruptly pulling the cord out of the socket.
408-105 Stator for angle grinders Hitachi G18SE3 and HAMMER.

Typical signs of stator failure:

A persistent smell of burnt insulation of the winding wires appears;
The temperature of the body parts increases significantly Angle grinder;
The angle grinder's electric drive makes a louder noise than normal;
The appearance of smoke is quite real;
The spindle begins to rotate more slowly or may even stop completely;
The opposite of the previous case is possible, the other extreme. The spindle spontaneously starts working at high speed, it turns the pedals.