Air conditioning apparatus

Details Air conditioning apparatus Air conditioning apparatus

1990-09-25

1992-02-18

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

417 45, 318811, F25B 100, H02P 100

Patent

active

050882970

ABSTRACT:
An air conditioning apparatus using a refrigerating cycle in which a scroll compressor is used to compress a refrigerant. The scroll compressor is driven by an induction motor. The speed of the induction motor is controlled by a PWM type inverter which produces an AC voltage of variable frequency. A carrier frequency higher than 10 KHz is used to effect pulse width modulation of the AC voltage of the inverter, whereby generation of uncomfortable noise is avoided. A control unit is provided to detect slip of the induction motor and to adjust the detached slip to a predetermined optimum value, thereby avoiding excessive lowering of the speed of the motor which may cause lack of lubricating oil for the compressor.

REFERENCES:
patent: 4636928 (1987-01-01), Deguchi et al.
patent: 4905135 (1990-02-01), Unehara et al.

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