| 摘要 |
PURPOSE:To reduce a difference between the compression torque of a compressor and the electromagnetic torque of a motor by detecting the angular velocity of rotation of a main shaft and controlling electromagnetic torque so that a difference with reference angular velocity obtained from the number of revolution substantially reaches zero within each dividing rotation angle range. CONSTITUTION:A gear 19 turned integrally with the main shaft of a motor 2 is mounted, and the revolution of the gear 19 is detected by an electromagnetic pickup 20. An output from the electromagnetic pickup 20 is inputted to an arithmetic memory circuit 22 through a waveform shaping circuit 21. The arithmetic memory circuit 22 detects the angular velocity of rotation within each dividing rotation angle range of the main shaft, and acquires differences among the detecting values and reference angular velocity obtained from the number of revolution. A torque control circuit 25 forms chopper signals on the basis of the difference signals, and transmits them to a base driver 24. |
