2-1Discuss different types of DC motor, Draw equivalent circuit and Torquespeed characteristics for all.2-2A 20-hp 240-V 76-A 900 r/min series motor has a field winding of 33turns per pole. Its armature resistance is 0.09 ohm, and its field resistance is 0.06Ohm. The magnetization curve expressed in terms of magnetomotive forceversus EA at 900 r/min is given by the following table: Armature reaction isnegligible in this machine. Rotational loss is 1.5KW.E, V95150188212229243F, A turns50010001500 | 200025003000Compute the motor's torque, speed, and output power at 158 % of full-loadarmature current. (Neglect rotational losses.)

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2-1 Discuss different types of DC motor, Draw equivalent circuit and Torque speed characteristics for all.

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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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

2-1
Discuss different types of DC motor, Draw equivalent circuit and Torque
speed characteristics for all.
2-2
A 20-hp 240-V 76-A 900 r/min series motor has a field winding of 33
turns per pole. Its armature resistance is 0.09 ohm, and its field resistance is 0.06
Ohm. The magnetization curve expressed in terms of magnetomotive force
versus EA at 900 r/min is given by the following table: Armature reaction is
negligible in this machine. Rotational loss is 1.5KW.
E, V
95
150
188
212
229
243
F, A turns
500
1000
1500 | 2000
2500
3000
Compute the motor's torque, speed, and output power at 158 % of full-load
armature current. (Neglect rotational losses.)

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