The large starting torque of deep slot and double cage asynchronous motors is due to the high rotor electromotive force and current frequency during startup, which results in an increase in rotor resistance due to the skin effect.
Normal operation, the skin effect is not significant, the rotor resistance is reduced to normal values. Therefore, the efficiency of the operation is still high.
The stator is the non-rotating part of the motor, the main task is to produce a rotating magnetic field. The rotating magnetic field is not realized mechanically. Instead, alternating current is passed through several pairs of electromagnets, so that the magnetic poles of the nature of the cycle change, so it is equivalent to a rotating magnetic field.
This kind of motor is not like the DC motor brush or collector ring, according to the type of alternating current used in single-phase motors and three-phase motors, single-phase motors are used in, such as washing machines, electric fans, etc.; three-phase motors are used as power equipment in factories.
Extended information:
Single-phase asynchronous motors are commonly used in household appliances and medical equipment. And three-phase asynchronous motors in agriculture and industry?
In recent years, with the power electronics technology? Microprocessor and coordinate transformation vector control theory in the application and development of asynchronous motors, so that the asynchronous motor speed performance is more and more close to or even more than the DC motor, more and more by the DC motor composed of DC speed control system by asynchronous motors and other components of the AC speed control system replaced.
Therefore, the asynchronous motor is a quite important electromechanical energy conversion device and actuator in the power drag system.