| 摘要 |
PURPOSE:To miniaturize a motor and facilitate the assembly, by regenerating the drop voltage of the respective phase coils of driving coils with a voltage drop regenerating circuit, and by putting the drop voltage together with the terminal voltage of the respective phase coils or the like, to feed selective signal to a driving circuit. CONSTITUTION:A brushless motor is provided with a rotor 1 and driving coils 2, and the respective phase coils 2 are driven by respective driving circuits 9. The coils 2 are provided with voltage drop regenerating circuits 6, a combination circuit 7, and a selection processing circuit 8; the respective voltage drop regenerating circuits 6 regenerate drop voltage due to the resistance component of respective phase coils U-W, and output regenerative voltages VU-VW. Accordingly, the combination circuit combines the terminal voltage of the respective phase coils U-W with the drop voltages VU-VW, and outputs counter electromotive forces PU-PW only. As the result, from the selection processing circuit 8, selective signal is fed to the driving circuit 9, and the rotor 1 can be stably rotated. |
