Question4 A 120-V series motor runs at 2000 rpm at full load and takes a current of 12A. The armature resistance is 0.3 ohms and the series field resistance is 0.2 ohms. A diverter resistance of 0.2 ohms is connected across the series field, and the load on the motor is adjusted. If the motor now takes 20A, what is the new speed of the motor, determine the torque developed in each case.

Question4 A 120-V series motor runs at 2000 rpm at full load and takes a current of 12A. The armature resistance is 0.3 ohms and the series field resistance is 0.2 ohms. A diverter resistance of 0.2 ohms is connected across the series field, and the load on the motor is adjusted. If the motor now takes 20A, what is the new speed of the motor, determine the torque developed in each case.

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

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.

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A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is the horsepower output of the motor?