Given a 3 V DC permanent magnet motor. It can provide a torque of 0.03 Nm when it is rotatingat 1200 rpm with a power efficiency of 60%.Calculate the output power (in W) of the motor and the applied current (in A).Calculate the back electromotive force EB (in V) and the motor constant (K) (in V s/rad)if EB = Ko.For a DC motor, t¤ V-EB. Derive the equation for the torque of the DC motor withrespect to speed t(@) and sketch the torque-speed curve (indicate the intercept values).Mark the operating point of the motor on the curve. What is the maximum speed of themotor in rpm?Discuss how the efficiency and power of the motor change if the applied torque isincreased from 0.03 Nm.а.b.с.d.Supposed you want to increase the torque of the motor to 0.05 Nm but keeping motorspeed at 1200 rpm, discuss how you can do that without changing the inside of the motor.Calculate the resulting back electromotive force EB and efficiency of the motor after thechange. Draw on the same torque-speed curve in part (c) how the operating point ischanged.е.

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Answered: permanent magnet motor.

Engineering

Electrical Engineering

permanent magnet motor.

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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Question

Given a 3 V DC permanent magnet motor. It can provide a torque of 0.03 Nm when it is rotating
at 1200 rpm with a power efficiency of 60%.
Calculate the output power (in W) of the motor and the applied current (in A).
Calculate the back electromotive force EB (in V) and the motor constant (K) (in V s/rad)
if EB = Ko.
For a DC motor, t¤ V-EB. Derive the equation for the torque of the DC motor with
respect to speed t(@) and sketch the torque-speed curve (indicate the intercept values).
Mark the operating point of the motor on the curve. What is the maximum speed of the
motor in rpm?
Discuss how the efficiency and power of the motor change if the applied torque is
increased from 0.03 Nm.
а.
b.
с.
d.
Supposed you want to increase the torque of the motor to 0.05 Nm but keeping motor
speed at 1200 rpm, discuss how you can do that without changing the inside of the motor.
Calculate the resulting back electromotive force EB and efficiency of the motor after the
change. Draw on the same torque-speed curve in part (c) how the operating point is
changed.
е.

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