The basic principle and the classification of single-phase AC motor

Principle of single phase AC motor

Illustrated with single phase capacitor motor: single phase motor with two windings,namely the starting winding and the running winding. Two windings in the spacedifference of 90 degrees. The starting winding is connected in series on a capacitor is larger, when the running winding and the starting winding through the single-phasealternating current, because of the effects of capacitor make the starting current in the winding in time than the current running winding ahead of the 90 degree angle,first reached the maximum value. The same two pulse magnetic field is formed in thetime and space, so that a rotating magnetic field generating air gap between the stator and the rotor, in the effect of rotary magnetic field, induced current in a rotorrotating magnetic field interaction, current and electromagnetic field generated torque,make the motor rotate.

220V AC single phase motor starting way about one of several:

First, starting winding is not involved in the operation, and the motor to run thewinding coil to action.

Second, motor static centrifugal switch is connected to the electric starting capacitorparticipation, after starting work, when the rotor speed reaches the rated value of 70%to 80% when the centrifugal switch will automatically trip, starting capacitor to complete the task, and is disconnected. A capacitor connected in series to participate in operation and operation work starting winding. Connection method generally used in air compressor, this cutting machine, woodworking machine tool with large load andunstable place.

Third, split phase starting type, is composed of auxiliary winding to auxiliary starting,the starting torque is small. Operation rate remained approximately constant value.Mainly used in electric fans, air-conditioning fan motor, washing machine motor.

Motor with centrifugal switch, if the motor can not start successfully in a very short time, so the windings will soon be destroyed.

The capacitance value: two value capacitor motor starting capacitor capacity, large capacity, small running capacitor, voltage is larger than 400V.