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Industrial Power Engineering Handbook by KC Agrawal

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4

Starting of Squirrel Cage Induction Motors

An induction motor can be regarded as a transformer with a small air gap in the magnetic circuit. When at rest, having no induced back e.m.f., it can be regarded as a transformer with a short-circuited secondary. A squirrel cage induction motor therefore draws a very high starting current, as noted in Section 1.2.1. However, it reduces substantially in a slip-ring motor due to the high impedance of the rotor circuit.

The starting of an induction motor does not ...

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