H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/50
H02P 23/10 (2006.01) H02H 7/085 (2006.01)
Patent
CA 1202673
ABSTRACT OF THE DISCLOSURE A variable speed drive for an AC motor has features to reduce the speed of the motor if excess temperature is encountered in the variable speed drive system. The system has a rectifier that converts AC supply voltage into DC voltage on the positive and negative rails. Frequency switches switch the DC voltage to power conductors in a sequence and at a rate to determine the selected frequency. The frequency switches are controlled by a DC demand voltage. A temperature sensor provides an electrical response corresponding to the temperature in the system. The temperature response is compared to a reference voltage, and if it exceeds the reference voltage, the comparator provides an output that draws down the demand voltage by a value corresponding to the difference. Lowering the demand voltage lowers the speed of the motor to allow the system to cool under reduced load conditions.
433761
Gowling Lafleur Henderson Llp
Hughes Tool Company
LandOfFree
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