1.Shaded pole motor is a single-phase motor.
2.Strictly speaking,the magnetic field generated by the main winding of a single-phase motor is a pulsating magnetic field instead of a rotating magnetic field,and there is no starting torque;that is, the motor will not rotate by itself after being energized.However,an external force in a certain direction can be applied to make it start,and it’s rotation direction is consistent with the direction of the external force.
3.In order to obtain the starting torque,in addition to the essential main winding,many single-phase motors also add a one-phase auxiliary winding,which has become a "two-phase" motor in a practical sense.
4.There is a certain phase difference between the magnetic field generated by the secondary winding and the magnetic field of the main winding.After the two interacts,a circular or elliptical rotating magnetic field is formed,which generates a starting torque to drive the motor to rotate.
5.The secondary winding of a shaded pole motor is a shaded pole ring(also called a short-circuit ring or a copper ring);it generates another shaded pole magnetic field with a phase difference with the main magnetic field by covering a small part of the main pole magnetic field;two magnetic fields After the interaction,an elliptical rotating magnetic field is formed.The "shaded pole" motor got its name from this.
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