A separately excited DC motor delivers 10 HP at 1,500 rpm, while producing an induced armature voltage of 110 Volts. The motor's armature circuit is powered by a DC source VT = 220 V. The field windings are powered from a separate DC source VF = 100 V, and the total field resistance RF = 100 2. You may assume that the rotational losses of this motor are negligable. Calculate the motor's overall efficiency in percent.

A separately excited DC motor delivers 10 HP at 1,500 rpm, while producing an induced armature voltage of 110 Volts. The motor's armature circuit is powered by a DC source VT = 220 V. The field windings are powered from a separate DC source VF = 100 V, and the total field resistance RF = 100 2. You may assume that the rotational losses of this motor are negligable. Calculate the motor's overall efficiency in percent.

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 6RQ: Name three factors that determine the torque produced by an induction motor.

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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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Step 1: Introduction

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Step 2: Calculating the Output Power and the Armature Current

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Step 3: Calculating the Input Power to the Armature and Calculating the Field Current

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Step 4: Calculating the Input Power to the Field Windings and Calculating the Total Power Input

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Step 5: Calculating the Efficiency

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