A 500-Volt shunt motor running at 720 rpm takes an armature current of 50A. The effective armature resistance is 0.4 ohms. What resistance must be placed in series with the armature to reduce the speed to 600 rpm? The torque remains constant.

A 500-Volt shunt motor running at 720 rpm takes an armature current of 50A. The effective armature resistance is 0.4 ohms. What resistance must be placed in series with the armature to reduce the speed to 600 rpm? The torque remains constant.

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 19RQ: Why is the starting torque per A of starting current of a wound-rotor motor higher than that of a...

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Concept explainers

Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

A 500-Volt shunt motor running at 720 rpm takes an armature current of 50A. The
effective armature resistance is 0.4 ohms. What resistance must be placed in series
with the armature to reduce the speed to 600 rpm? The torque remains constant.

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