Answered: In speed coontrol of dc motor, the…

Engineering

Mechanical Engineering

In speed coontrol of dc motor, the potentiometer is used as a control element.

Electrical Transformers and Rotating Machines

4th Edition

ISBN:9781305494817

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter19: Motor Maintenance And Troubleshooting

Section: Chapter Questions

Problem 7RQ

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Concept explainers

Electrical Motor

An electric motor can be described as an electrochemical machine that transforms electrical energy into mechanical energy. This mechanical energy is utilized to revolve the pump, fan, and impeller, operate compressors and lift bodies. The motors employed in industries operate on 70% electrical load.

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In speed coontrol of dc motor, the potentiometer is used as a control element.

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False

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In speed coontrol of dc motor, the final control element is motor. Select one: O True False
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QUESTION 8 Consider the equations of motion of an armature controlled DC motor given by Jw(t)+bw (t) Ki(t) = -Tfriction - Tload (t) di (t) + Ri (t) + Kw (t) = Vin (t), dt where vin(t) is the input voltage and Tload(t) is the input load torque. The outputs are the armature current i(t) and the motor speed w(t). The steady-state response of motors are specified by nominal voltage, stall torque, stall current, no load speed, and no load current. At steady-state operation, the motor equations satisfy bo) -Ki =-T -T. fric load Ri +Kov_- 55 55 The stall torque is the load torque required stead-state speed of the motor is zero. The stall current is the armature current when the motor speed is zero. The no load speed is the speed of motor when the load torque is zero. The no load current is the current when the load torque is zero. What is stall torque for this motor in N-m? Keep 3 significant figures, and do not include units. Use Scientific notation. The constants are given below. Nominal…
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