1. The resistance of the armature of a 25 hp 250 volt series motor is 0.12 ohm and the series field resistance is 0.10 ohm. When the motor takes 85 A, the speed is 600 rpm. Determine speed when the current is 100 A.

1. The resistance of the armature of a 25 hp 250 volt series motor is 0.12 ohm and the series field resistance is 0.10 ohm. When the motor takes 85 A, the speed is 600 rpm. Determine speed when the current is 100 A.

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

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

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1. The resistance of the armature of a 25 hp 250 volt series motor is 0.12 ohm and the
series field resistance is 0.10 ohm. When the motor takes 85 A, the speed is 600 rpm.
Determine speed when the current is 100 A.

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