The motor is energized and does not rotate, there are two parts to find the fault.
One, the mechanical part, look at the motor to drag the equipment is not stuck, and then there is the motor's own rotation of the shaft, bearings, is not stuck;
Second, the electrical part, look at the motor is not the coil (windings) have the possibility of disconnecting, look at the power supply, air open, contactor, thermal protection, phase protector, wiring, and so on, is not a lack of phase, the possibility of phase, with an electrician meter to detect. Electrical instrumentation test. Single-phase motor, start capacitor is not bad, and so on.
Expanded Information:
Single-phase motors generally refer to low-power single-phase asynchronous motors powered by a single-phase alternating current supply (AC220V). These motors usually have two-phase windings on the stator and an ordinary squirrel-cage rotor. The distribution of the two-phase windings on the stator and the difference in power supply can produce different starting and operating characteristics.
Single-phase motor, refers to the 220V AC single-phase power supply and operation of asynchronous motors. Because 220V power supply is very convenient and economical, and family life with electricity are 220V, so single-phase motor not only in the production of a large amount, but also with people's daily life, closely related, especially with the people's living standards are increasingly improving, household electrical equipment, single-phase motor usage, but also more and more.
Applied in the production of micro-pumps, grinders, threshing machines, pulverizers, woodworking machinery, medical equipment, etc., in terms of life, there are fans, hair dryers, exhaust fans, washing machines, refrigerators, etc., a wider variety of types, but the power is smaller.
Baidu Encyclopedia: single-phase motor