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permanent magnet motor.

permanent magnet motor.

Introductory Circuit Analysis (13th Edition)
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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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.
Transcribed Image Text: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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