Health monitoring method and system for a permanent magnet...

Details Health monitoring method and system for a permanent magnet... Health monitoring method and system for a permanent magnet...

2007-11-20

2007-11-20

Lee, Benjamin C. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S679000, C318S434000, C318S565000, C361S023000

Reexamination Certificate

active

10831873

ABSTRACT:
A method and system for monitoring the performance of a permanent magnet device, such as a motor or generator, and providing early detection of motor performance deterioration. The back electromotive force (EMF) of the motor is measured at selected conditions when the motor is in a normal healthy condition to obtain a reference signature response. A measured signature is then obtained periodically during the life of the motor at the same conditions as the reference signature to check the current back EMF characteristic of the motor. If the measured signature deviates from the reference signature by a predetermined threshold, it indicates that the motor performance has degraded to a condition requiring attention.

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Search Report EP 05 25 2596.

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