The counter-emf of a motor is alwaysslightly less than the applied armature volt-age. Explain.Name two methods that are used to varythe speed of a de motor.Explain why the armature current of a shuntmotor decreases as the motor accelerates.

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Answered: The counter-emf of a motor is always…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

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A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.
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Draw the circuit please.
A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mQ and a total field-circuit resistance of 55 0. Draw a schematic of the motor in the space below showing all known quantities (resistances, currents, voltages and load). Show only symbols for unknowns.

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The counter-emf of a motor is always slightly less than the applied armature volt- age. Explain. Name two methods that are used to vary the speed of a de motor. Explain why the armature current of a shunt motor decreases as the motor accelerates.