Question

Choose the correct in the case of V/F control.

(a) Ns-Nr=constant

(b) Ns*Nr=constant

(c) Ns%Nr=constant

(d) Ns+Nr=constant

I have been asked this question in quiz.

My enquiry is from Induction Motors in division Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

Right option is (a) Ns-Nr=constant

The best I can explain: In variable frequency control Ns-Nr remains constant. V/f control is part of the synchronous speed changing technique. It is the most used technique in controlling the induction motor.