Introduce the working principle of single-phase motor in detail

Classification:

Single-phase asynchronous motor is a rotating motor powered by single-phase communication power supply, and its stator winding is single-phase. When the single-phase communication power is connected, an alternating pulsating magnetic field will occur in the air gap of the stator and rotor, so the single-phase asynchronous motor cannot be started by itself. In a communicating motor, when the stator windings pass a communicating current.

The armature magnetomotive force is established, which has a great influence on the energy conversion and operation function of the motor. Therefore, the single-phase communication winding is connected to the single-phase communication to generate a pulse-induced magnetomotive force, which can be decomposed into two rotating magnetomotive force sum with equal amplitude and opposite rotating speed, thus establishing a positive and rotating magnetic field sum in the air gap.

These two rotating magnetic fields cut the rotor conductor, and induced electromotive force and induced current occur in the rotor conductor respectively. The current interacts with the magnetic field to generate positive and negative electromagnetic torque. Forward electromagnetic torque attempts to turn the rotor forward; reverse electromagnetic torque attempts to turn the rotor. These two torques are superimposed to drive the motor to rotate the resultant torque.

Whether the positive magnetic field is still rotating magnetic field, the relationship between their size and slip rate is the same as that of three-phase asynchronous motors. If the speed of the motor is n, the main characteristics of the single-phase asynchronous motor can be seen from the T-s curve of the single-phase asynchronous motor: n = 0,s = 1,T = T T- = 0, which clarifies that the single-phase asynchronous motor has no starting torque. If other methods are not adopted, the motor cannot start.

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