| 摘要 |
PURPOSE:To obtain uniform generating force without irregularity by partly modulating the power which is supplied to a coil, thereby cancelling the variation in the place of a field magnetic flux. CONSTITUTION:A current converter 9 compares the instruction signal 17 with the voltage value of a voltage power source 18 and outputs a current which corresponds to the difference. A similar current generator 10 responses to the output current of a current converter 19 and outputs a current which is determined at the relative ratio. A modulator 22 outputs an output signal which is modulated from the similar current in response to the modulation signal which is produced by a modulation signal generator 21. The similar current and the modulated current are synthesized by a synthesizer 23, and the current which corresponds to the output signal of the synthesizer is supplied to the coils 14-16 through a power supply unit 24. |
