Electronically commutated motor for driving a compressor

Details Electronically commutated motor for driving a compressor Electronically commutated motor for driving a compressor

1995-02-14

1996-02-20

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62158, 62230, 361 22, 361 29, F25B 4902, H02H 700

Patent

active

054919789

ABSTRACT:
A system which drives a compressor of a refrigeration system at one or more speeds. The system includes a motor having a stationary assembly and a rotatable assembly. The stationary assembly includes windings adapted to be commutated in at least one preselected sequence. The rotatable assembly is in magnetic coupling relation to the stationary assembly and in driving relation to the compressor. The motor drives the compressor at a desired speed corresponding to a speed select signal representative of one of the speeds. The system further includes an application specific integrated circuit (ASIC) connected to the motor. The ASIC receives the speed select signal and is responsive to it for generating a commutation reference signal. The commutation reference signal in combination with the commutation signal generates a peak current demand signal and thereby cause the motor to operate at the desired speed. The ASIC includes a fault detector for detecting overcurrent, underspeed and/or undervoltage conditions of the motor and a protective circuit for disabling the motor when at least one of the conditions is detected. An inhibitor circuit prevents disablement of the motor during a period of time immediately following starting of the motor and a reset circuit resets the detector after another period of time to permit enablement of the motor after disablement thereof. The ASIC further includes a timer for timing the periods of time.

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