| 摘要 |
PURPOSE:To obtain a driving apparatus which drives a motor with high accuracy, stably and at low costs by a method wherein the output current value of a current source which supplies a current to a charge-and-discharge circuit is controlled according to the magnitude of the output signal of the charge-and- discharge circuit. CONSTITUTION:A voltage waveform is waveform-shaped by a counter electromotive-force detector 10, and U1, V1 and W1 are outputted so as to be inputted to a trapezoidal-wave-current composition device 11. The trapezoidal- wave-current composition device 11 outputs current outputs IPL1 to IPL3, IPU1 to IPU3 so as to be inputted to a current distribution circuit 13. Then, the current distribution circuit 13 sequentially supplies a driving current to driving coils 1 to 3 according to the current outputs IPU1 to IPU3, IPL1 to IPL3. Consequently, a motor can be driven with high accuracy, stably and at low costs without especially over the capacitance value of a capacitor and the to of a charging current with reference to the number of revolutions of the motor in a wide range. |
