Single-phase motor is a low-power single-phase asynchronous motor, generally using single-phase AC power supply (AC220V) Power supply; Usually there are two phase windings on the stator, and the rotor is an ordinary squirrel cage type; The following is related to a simple understanding of Senli MotorSingle-phase machineHow it works.

       To make the single-phase motor can rotate automatically, we can add a starting winding in the stator, and the starting winding is different from the main winding in space90The starting winding should be connected with a suitable capacitor in series so that the current in the main winding is approximately different in phase90Degree, the so-called phase separation principle.

       So the two are different in time90The degree of current into the two differs in space90The winding will generate (two-phase) rotating magnetic field in space, under the action of this rotating magnetic field, the rotor can automatically start, after starting, when the speed rises to a certain point, with the help of a centrifugal switch or other automatic control device installed on the rotor will disconnect the starting winding, and only the main winding will work normally.

       Therefore, the starting winding can be made into a short-time operation mode. But there are many times, the starting winding is not disconnected, we call this motor as a single-phase motor, to change the direction of this motor, as long as the auxiliary winding terminals can be replaced.

       When the single-phase sinusoidal current passes through the stator winding, the motor will produce an alternating magnetic field, the strength and direction of the magnetic field change sinusoidal law at any time, but it is fixed in the spatial orientation, so it is also called the magnetic field is an alternating pulsating magnetic field.

       This alternating pulsating magnetic field can be decomposed into two rotating magnetic fields with the same speed and opposite rotation directions. When the rotor is stationary, the two rotating magnetic fields produce two equal and opposite torques in the rotor, making the resultant torque zero, so the motor cannot rotate.

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