Overtemperature speed control for a variable speed drive

Details Overtemperature speed control for a variable speed drive Overtemperature speed control for a variable speed drive

1982-12-20

1985-09-17

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 361 25, H02P 540

Patent

active

045423245

ABSTRACT:
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.

REFERENCES:
patent: 3568949 (1971-06-01), Spear
patent: 3748556 (1973-07-01), Gillett
patent: 4152632 (1979-05-01), Peterson
patent: 4284943 (1981-08-01), Rowe

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