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In case of DC servomotor the back-emf is equivalent to an “electric friction” which tends to :

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In case of DC servomotor the back-emf is equivalent to an “electric friction” which tends to :

(a) Improve stability of the motor

(b) Slowly decrease stability of the motor

(c) Vary rapidly decrease stability of the motor

(d) Have no effect on stability

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

My doubt is from State Models for Linear Continuous-Time Systems in section State Variable Analysis and Design of Control Systems

1 Answer

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Correct choice is (a) Improve stability of the motor

For explanation I would say: Back emf is the voltage that is generated in absence of the input and in case of DC servomotor tends to improve the stability of the motor.

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