A 220 V, DC separately excited motor drives a constant torque load at 828.11 rpm speed.The armature and field resistances are 0.4 and 135 N, respectively. The motor draws a linecurrent of 8 A at the given load. If rotational losse is equal to Prot = 0.1 Pin, answer thefollowing questions.1- Calculate the armature voltage toreduce the speed by 90%.VVМ12- Calculate the armature voltage toVtU1Vfoperate the motor at the holdingcondition.T= 20EaV3- Calculate the efficiency of themotor at rated condition.%4- Calculate the efficiency of the motor for part 1.%

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A 220 V, DC separately excited motor drives a constant torque load at 828.11 rpm speed. The armature and field resistances are 0.4 N and 135 N, respectively. The motor draws a line current of 8 A at the given load. If rotational losse is equal to Prot = 0.1 Pin, answer the following questions.

A 220 V, DC separately excited motor drives a constant torque load at 828.11 rpm speed. The armature and field resistances are 0.4 N and 135 N, respectively. The motor draws a line current of 8 A at the given load. If rotational losse is equal to Prot = 0.1 Pin, answer the following questions.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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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.

Question

A 220 V, DC separately excited motor drives a constant torque load at 828.11 rpm speed.
The armature and field resistances are 0.4 and 135 N, respectively. The motor draws a line
current of 8 A at the given load. If rotational losse is equal to Prot = 0.1 Pin, answer the
following questions.
1- Calculate the armature voltage to
reduce the speed by 90%.
V
V
М1
2- Calculate the armature voltage to
Vt
U1
Vf
operate the motor at the holding
condition.
T= 20
Ea
V
3- Calculate the efficiency of the
motor at rated condition.
%
4- Calculate the efficiency of the motor for part 1.
%

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