题目内容
The rotating magnetic field is produced by the three-phase current of the statorin the actual three-phase induction motor.
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A 3 phase induction motors do not need a start winding or a Centrifugal switch as it has a RMF (rotate magnetic field). A RMF makes a 3 phase induction motor self-starting
A transformer can be used for reducing output voltage but also increasing the output voltage. But it’s only on AC. If connect a transformer to DC power supplier the transformer will be over heated
Select all electromagnetic devices you have learnt from this unit VU22496
Match the following advantageswithac, dc, and step motors
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