Q31. A d.c. shunt motor runs at 500 r.p.m. at 220 V. A resistance of 4.5 Q is added in series with the armature for speed control. The armature resistance is 0.5 Q. The current to stall the motor is 44 A 50 A 40 A 30 A

Q31. A d.c. shunt motor runs at 500 r.p.m. at 220 V. A resistance of 4.5 Q is added in series with the armature for speed control. The armature resistance is 0.5 Q. The current to stall the motor is 44 A 50 A 40 A 30 A

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter33: Four-speed, Two-winding (consequent Pole) Motor Controllers

Section: Chapter Questions

Problem 7SQ: Why are different motor connections shown for what appears to be the same motor in the various...

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

Q31. A d.c. shunt motor runs at 500 r.p.m. at 220 V. A
resistance of 4.5 Q is added in series with the armature
for speed control. The armature resistance is 0.5 Q. The
current to stall the motor is
44 A
50 A
40 A
30 A
26
DC Motor Q&A Part 1
Tikrit University
Dr Thamir Hassan Atyia

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