抄録
Recently, in refrigerator, reduction of power consumption is very important technology. Under such circumstances, the inverter control technology of a compressor contributed to reduction of power consumption greatly.
Now, as for inverter control of a refrigerator, the rectangle wave drive is mainly used. However, one of the disadvantages of this control is that the limit of an operating area is low. Consequently, when the efficient motor that increased the number of motor winding is driven, the maximum speed will be controlled further. Then we developed the method of extending the operation area of the motor under a rectangle wave drive. Consequently, operating without reducing the maximum speed of an efficient motor was realized.
