AC Motor Won't Turn Without a Helping Hand

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om_tech_support_JT
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AC Motor Won't Turn Without a Helping Hand

Postby om_tech_support_JT » Fri Aug 13, 2010 3:56 pm

Q: We wired the induction motor according to the wiring diagram, but it does not move. When we turned the shaft by hand, it started to move in the direction we turned it. What could be the cause of this?

A: In order to turn a single-phase induction motor, it is necessary to use a capacitor to create two power supplies with different phases to obtain the rotating magnetic field. Therefore, if the capacitor is not properly connected, the phenomenon described occurs. Check for a cut line or contact defect in the capacitor section. The way to check is to measure the voltage across the capacitor terminals and check whether or not it is at least 1.5 times the power supply voltage. If not, the capacitor may not be working properly.

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