MOTOR DRIVING DEVICE AND REFRIGERATOR USING SAME

The starting torque and the rotation starting position of the brushless DC motor (5) are determined so that the vibration at the start of operation of the compressor (17) and the vibration caused by the reduction of the load torque cancel each other. By using this configuration, the motor drive device (30) can reduce the vibration generated from the compressor (17) to a smaller degree than when a peak value of a vibration amplitude generated at the start of operation and a peak value of a vibration amplitude generated by a sudden acceleration due to a decrease in load torque are generated separately, and can reduce the vibration generated from the compressor (17). As a result, it is possible to provide a motor drive device (30) that can be stably started while suppressing vibrations even in a compressor (17) having a large variation in torque. 本发明决定无刷DC电机(5)的启动转矩和旋转开始位置，使得压缩机(17)的运转开始时的振动和由负载转矩的减少引起的振动相互抵消。电机驱动装置(30)通过采用该结构，与分别单独产生在运转开始时产生的振动振幅的峰值和因负载转矩的减少而发生的急剧加速所产生的振动振幅的峰值的情况相比变小，能够将从压缩机(17)产生的振动抑制得较小。由此，能够