A permanent magnet motor equipped with cobalt-samarium magnets loses 3% of its magnetism per 100°C increase in tempera- ture. The motor runs at a no-load speed of 2500 r/min when connected to a 150 V source in an ambient temperature of 22°C. Estimate the speed if the motor is placed in a room where the ambient temperature is 40°C

A permanent magnet motor equipped with cobalt-samarium magnets loses 3% of its magnetism per 100°C increase in tempera- ture. The motor runs at a no-load speed of 2500 r/min when connected to a 150 V source in an ambient temperature of 22°C. Estimate the speed if the motor is placed in a room where the ambient temperature is 40°C

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter51: Electric And Electronic Braking

Section: Chapter Questions

Problem 2SQ: Differentiate between the AC and DC magnetic fields applied to an induction motor stator.

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Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

19 A permanent magnet motor equipped with
cobalt-samarium magnets loses 3% of its
magnetism per 100°C increase in tempera-
ture. The motor runs at a no-load speed of
2500 r/min when connected to a 150 V source
in an ambient temperature of 22°C. Estimate
the speed if the motor is placed in a room
where the ambient temperature is 40°C.

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