| 摘要 |
PURPOSE:To prevent the resonance state of the whole device from being generated by using a magnetic means, a timing generating means, a rotation information detecting means, a regulating means, and the like, and by changing an electrification timing to an exciting coil. CONSTITUTION:A main important section is composed of a microcomputer 9 for controlling the driving of a brushless motor 1, a three-phase inverter circuit 10 for electrifying the exciting coil 1a of the brushless motor 1 according to the output signal of the micro-computer 9, and the like. Output from an excess current detecting circuit 6 for detecting the excess current of the exciting coil 1a is digitize by a multiplexer 7 and an A/D converter 8, and the input to the microcomputer 9 is provided. By the micro-computer 9, an electrifying timing is changed, and the distribution of oscillatory frequency is changed, and the resonance of the whole device is prevented from being generated. |
