The prony brake test of an elevator door drive shunt motor, the ammeter and voltmeter measuring the input read 60A and 240V. The speed of the motor is found to be 1200rpm and the balance on a 2.3ft brake arm read 28.4 lbs. The tare weight of the arm is found to be 2.275 lbs. What is the BHp (in Hp) of the motor at this load?

The prony brake test of an elevator door drive shunt motor, the ammeter and voltmeter measuring the input read 60A and 240V. The speed of the motor is found to be 1200rpm and the balance on a 2.3ft brake arm read 28.4 lbs. The tare weight of the arm is found to be 2.275 lbs. What is the BHp (in Hp) of the motor at this load?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 19RQ: A motor is operating a load that requires a torque of 750 lb-in. and is turning at a speed of 1575...

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