Air conditioning apparatus
First Claim
1. An air conditioning apparatus, comprising:
- a scroll compressor for compressing a refrigerant to effect a refrigerating cycle;
an induction motor for driving said scroll compressor; and
an inverter for feeding an AC voltage of variable operating frequency to said induction motor, said inverter including a voltage pulse-width modulating circuit for pulse-width modulating the AC voltage by a carrier frequency higher than 10 KHz, and control means for detecting the slip of said induction motor and correcting the detected slip to a predetermined optimum value.
1 Assignment
0 Petitions
Accused Products
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.
117 Citations
2 Claims
-
1. An air conditioning apparatus, comprising:
-
a scroll compressor for compressing a refrigerant to effect a refrigerating cycle; an induction motor for driving said scroll compressor; and an inverter for feeding an AC voltage of variable operating frequency to said induction motor, said inverter including a voltage pulse-width modulating circuit for pulse-width modulating the AC voltage by a carrier frequency higher than 10 KHz, and control means for detecting the slip of said induction motor and correcting the detected slip to a predetermined optimum value. - View Dependent Claims (2)
-
Specification