Shaded-pole motors have the advantages of simple structure, convenient manufacture, reliable operation, convenient maintenance, low cost, and low noise. Although its power factor and efficiency are low, its starting torque is small and the slip rate is large, so it is widely used in places with low performance requirements such as motors and small capacity when starting with no load or light load, such as instrument fans, fan etc.

So when you find that the motor starts slowly and the speed decreases, you can check whether the following faults occur:

1. The voltage of the electric source is too low, and the adjustment voltage should be checked.

2. The wiring of the main and auxiliary windings is wrong, and the wiring should be carefully checked and corrected.

3. The short-circuit winding of the motor is desoldered and should be re-soldered.

4. The capacitance of the capacitor running motor is insufficient, and sufficient capacity should be provided according to the regulations.

5. The bearing lubrication is dry, it should be cleaned regularly and new grease should be added.

6. The motor has been put on hold for a long time and is damp, and it is shown as an insulation performance test before running. After running, the short circuit between the turns of the motor causes the speed to decrease, and the coil should be re-wound.

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