| 摘要 |
PURPOSE:To change torque generated in a motor smoothly by switching- operating the common signals of each phase and the drive signal of phase. CONSTITUTION:A timer LSI12 measuring time and a CPU11 controlling phase are mounted. When the A phase of a steeping motor is driven, currents suddenly intend to rise from the asymptotic line of a sine wave when the common signal SPCOM13 of A phase is turned ON, but the ON-OFF time is programmed previously to the timer 12 so that the common signal SPCOM13 is turned ON again when the common signal is turned OFF so that a current value is formed along the asymptotic line of the sine wave and the current value is made smaller than the asymptotic line. Accordingly, the common signal wave, and a phase signal SPDRV11 is switched and controlled up to torque of '0' from the peak value. |
