| 摘要 |
PROBLEM TO BE SOLVED: To uniformalize abrasion of a bearing due to difference of the loads of each compressor, by reading the operating current of each compressor with a sensor, and by inputting a longer load-up signal output width into a compressor with the low operating current to eliminate the difference of operating current when the difference between any two current values exceeds a fixed value. SOLUTION: During the operation and control of a refrigerator having a plurality of compressors, the difference between a current i1 of a No.1 compressor and a current i2 of a No.2 compressor becomes larger with the operation time since starting of the operation, and the operation is continued in this condition. When the current difference exceeds a fixed value, the load-up cycle T of the No.2 compressor whose operating current is low is not changed, and the load-up output widths t1, t2 of the No.1 and No.2 compressors are changed to meet the following equation: t2=t1×1;(i1-i2)/i2}. Thus, the difference between the operating current of the No.2 compressor and that of the No.1 compressor is eliminated, and both of operating currents i1, i2 are equalized each other.
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