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Which starting method is the worst method in Induction motor?

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in Electric Drives by (99.8k points)
Which starting method is the worst method in Induction motor?

(a) Direct online starting

(b) Autotransformer starting

(c) Reactance starting

(d) Star-Delta starting

I had been asked this question during an online interview.

Enquiry is from Motors Rating and Heating topic in division Rating and Heating of Motors of Electric Drives

1 Answer

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by (65.4k points)

The worst starting method for an induction motor, in terms of current inrush and mechanical stress on the motor, is typically Direct Online (DOL) starting. This method connects the motor directly to the supply voltage, resulting in a high inrush current (up to 6-8 times the full-load current) and a sudden mechanical shock on the motor shaft.

Thus, the correct answer is (a) Direct online starting.

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