What is the function of the shaded pole motor

The Shaded Pole Motor is a common single-phase AC motor whose working principle is based on the unique design of the shadow pole.
In the Shaded Pole Motor, the shadow pole is achieved by setting a copper or aluminum ring on the armature to generate a shadow area. When current passes through the armature coil, the main magnetic pole forms a rotating magnetic field on the armature, and the presence of the shadow pole will produce a shadow area on the armature, making the magnetic field uneven. This uneven magnetic field distribution will cause a rotational torque on the armature, thereby driving the motor to rotate.
The design of the shadow pole enables the motor to generate a rotational torque when it is running, which is the key to the Shaded Pole Motor's ability to rotate. The uneven magnetic field generated by the shadow pole causes the induced current on the armature to generate a rotational torque, which causes the motor to start rotating. Therefore, the presence of the shadow pole is an important factor in the Shaded Pole Motor's ability to self-start and rotate.
Since the Shaded Pole Motor is a single-phase induction motor, its starting performance is poor. However, the presence of the shadow pole can provide additional rotational torque to help the motor start. During the motor startup phase, the shadow pole acts like a booster, which can help the motor overcome inertia and inertia and achieve rapid start. In addition, during operation, the shaded pole can also provide additional rotational torque to keep the motor running stably.
The existence of the shaded pole can enable the Shaded Pole Motor to provide sufficient rotational torque at low speed, thereby improving the efficiency and output power of the motor. Compared with other types of single-phase induction motors, the Shaded Pole Motor can maintain a higher efficiency at low speed due to the effect of the shaded pole, and is suitable for some low-power and low-speed applications.