| 摘要 |
PURPOSE:To provide constant optimal timing control for energizing a motor irrespective of motor speed by generating a power switching signal for a driving coil in response to the detected voltage of the motor driving coil. CONSTITUTION:The voltages EU, EV, and EW induced by motor driving coils 2a, 2b and 2c are compared with the source voltage Vcc by comparators 11a, 11b and 11c which, in turn, produce reference phase pulses PUO, PVO and PWO. These reference phase pulses are sent to a power switching pulse generator means 7, and converted to power switching pulses PU, PV and PW having a delay time set by delay means 5. The power switching pulses PU, PV and PW are sent to a power switching circuit 8, which produces OUTU, OUTV and OUTW. The power switching pulses are supplied to the bases of a drive transistors 1a, 1b and 1c to sequentially switch the state of energization for the motor driving coils. Therefore, the motor continues running efficiently. |
