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How Does AC Motors Work I


The AC NanYang Motor is an electric motor that is power […]

The AC NanYang Motor is an electric motor that is powered by an alternating current. The main types are: single-phase asynchronous motors and single-phase series motors.

(1) Single-phase asynchronous AC motor. Single-phase asynchronous motors are a more common type of AC motor, with single-phase AC power as the power source. The working characteristic of such a motor is that the rotational speed of the rotor is slightly lower than the rotational speed of the rotating magnetic field of the stator. Since the rotating magnetic field of the stator is not synchronized with the rotation of the rotor, it is called an asynchronous motor. The current passing through the rotor winding of the motor is not directly supplied from the power source, but is induced by the rotating magnetic field of the stator, so that the rotor induced current always lags behind the rotating magnetic field of the stator. Therefore, the two cannot be synchronized. According to the way the stator generates a rotating magnetic field, single-phase asynchronous motors are divided into three types:

1) Covered pole motor. The shaded pole motor is a relatively simple one of the single phase asynchronous motors. Its structural feature is to cover a part of the magnetic poles in the stator with a short-circuit coil or a short-circuited copper ring (or called a pole coil). The cover pole coil is used to change the distribution of the magnetic field to form a rotating magnetic field, thereby realizing the starting operation of the motor. Figure 2.1.4 shows the structure of a salient pole shaded motor. A field winding is wound around the protruding stator pole, and a small slot is inserted in the pole 1/2 to 1/3 of the pole pole of the stator pole to embed the short-circuit copper ring to cover the magnetic pole. Since the induced current generated in the short-circuit ring (shield coil) always prevents the magnetic flux change that is covered by the magnetic pole, when the alternating current changes in a sinusoidal manner, the magnetic flux density distribution on the stator magnetic pole changes accordingly.