Logic control system for inverter-driven motor

Details Logic control system for inverter-driven motor Logic control system for inverter-driven motor

1979-09-12

1981-04-07

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62228, 318334, 318806, 318808, G05B 500, H02P 528, F25B 100

Patent

active

042598451

ABSTRACT:
The logic control system of the invention regulates the frequency of operation of an inverter which drives an electric motor, and also regulates the level of the d-c bus voltage supplied to the inverter. This is accomplished by sensing the level of the bus voltage and the level of the current supplied to the motor, and comparing the sensed values to a reference or set point signal. The motor drives a compressor, and a capacity control system cooperates with the logic control system in the regulation of the compressor. The capacity control system provides signals, such as start/stop and inverter set point, to the logic control system to assist in regulating operation of the inverter which drives the compressor. In particular the logic control system includes a reference conductor on which a basic reference control signal is developed for use in controlling both the amplitude and the frequency of the a-c energy supplied by the inverter to the motor.

REFERENCES:
patent: 3355906 (1967-12-01), Newton
patent: 4048554 (1977-09-01), Stich
patent: 4151725 (1979-05-01), Kountz et al.

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