In our daily lives, we constantly encounter various electrical devices that greatly facilitate our activities. Almost all of them have in their design an engine powered by electricity to perform a certain job. Sometimes, for various reasons, malfunctions arise in it. It is necessary to determine its performance, to identify and repair damage.

Immediately make a reservation that we will not resort to complex technical descriptions and formulas, but try to use simplified schemes and terminology. We also take into account that working with electric motors in electrical installations is dangerous. They are allowed trained, trained personnel. By mechanical design, any electric motor can be imaginedconsisting of only two parts: stationary fixed, which is called a statorand attached to the machine body...

Single-phase motors are electric machines of low power. In the magnetic circuit of single-phase motors there is a two-phase winding, consisting of the main and starting windings.

Two windings are needed in order to cause the rotation of the rotor of a single-phase motor. The most common motors of this type can be divided into two groups: single-phase motors with a starting winding and motors with a working capacitor.

For engines of the first type, the starting winding is switched on through the capacitor only at the time of starting and after the engine has developed a normal rotation speed, it is disconnected from the network. The engine continues to work with one working winding. The value of the capacitor is usually indicated on the nameplate of the motor and depends on its design. Single-phase AC induction motors with a working capacitor have an auxiliary winding ...