| 摘要 |
PURPOSE:To reduce various vibrations by variably setting at least any one of rising, falling characteristics and amplitude of a pulse for driving a motor in response to the detection level of a vibration detector. CONSTITUTION:A controller 20 compares a vibration measurement level from a vibration sensor 21 with a standard level. When the vibration input level is larger than the standard level, the controller 20 instructs, to minimize the input level, to lower a voltage to a predetermined voltage level to a constant- voltage controller 19 so that a supply current to a coil 5 becomes smoothly rising characteristic. Then, the controller 20 compares it with the standard level of the input level. When the vibration level does not drop, the controller 20 sets to vary a conduction instruction signal generating time to a high frequency switching transistor 15 to shape the pulse waveform so that the switching duty is reduced to smooth the falling characteristic. |
