A 220 V shunt motor has an armature resistance of 0.2 N and a field resistance of 110 N. The motor draws 5 A at 1500 r.p.m at no load. (a) What is the field current, at rated voltage? (b) What is the back e.m.f, at rated voltage? (c) If, at a given load, the motor draws a current of 52 A at rated voltage, what is the speed of the motor? (d) What is the field current, at rated voltage? (e) What is the back e.m.f, at rated voltage? (f) If, at a given load, the motor draws a current of 52 A at rated voltage, what is the speed of the motor?

A 220 V shunt motor has an armature resistance of 0.2 N and a field resistance of 110 N. The motor draws 5 A at 1500 r.p.m at no load. (a) What is the field current, at rated voltage? (b) What is the back e.m.f, at rated voltage? (c) If, at a given load, the motor draws a current of 52 A at rated voltage, what is the speed of the motor? (d) What is the field current, at rated voltage? (e) What is the back e.m.f, at rated voltage? (f) If, at a given load, the motor draws a current of 52 A at rated voltage, what is the speed of the motor?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...

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Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

A 220 V shunt motor has an armature resistance of 0.2 N and a field resistance of 110
N. The motor draws 5 A at 1500 r.p.m at no load.
(a) What is the field current, at rated voltage?
(b) What is the back e.m.f, at rated voltage?
(c) If, at a given load, the motor draws a current of 52 A at rated voltage, what is the
speed of the motor?
(d) What is the field current, at rated voltage?
(e) What is the back e.m.f, at rated voltage?
(f) If, at a given load, the motor draws a current of 52 A at rated voltage, what is the
speed of the motor?

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