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In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will ___________

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In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will ___________

(a) Increase

(b) Decrease

(c) Remain unchanged

(d) First increases then decrease

I had been asked this question in an interview for job.

This interesting question is from Induction Motors Speed Control topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right option is (a) Increase

The explanation is: In the rotor injection method, when an external voltage is in phase with the main voltage net voltage increases and the value of slip decreases and the value of rotor speed increases.

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