PURPOSE: To reduce jarring noises, and prevent the revolution number of a compressor from decreasing even at a low operation frequency by a method wherein a carrier frequency for a voltage type PWM method inverter, of which the operation frequency can be changed, to drive an induction motor for a compressor, is made a high carrier frequency which is at a specified value or higher by using a scroll compressor.
CONSTITUTION: A scroll compressor 5 which has an induction motor 6 inside, and performs the suction, compressor and discharge of a refrigerant by the rotation of the induction motor 6 is provided. Then, an inverter 8 which control the revolution number of the induction motor 6 in the scroll compressor 5 by utilizing a supply power source 7 is provided. Since an inverter control device performs a PWM in such a manner that the higher an operation frequency becomes, the higher a timewise mean voltage of the output to the induction motor 6 is made, and the induction motor 6 rotates at a higher revolution number when the operation frequency is higher, and a capacity control of the scroll compressor 5 becomes possible. Then, the carrier frequency for the PWM is made 10kHz or higher, and electromagnetic noises at an audible frequency are prevented from generating.
| JP2006233795 | COMPRESSOR |
| JPH08135578 | LIQUID FLOW RATE CONTROL DEVICE |
KATO TAKASHI
TANIGUCHI MASAYA
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