| 摘要 |
PURPOSE:To accurately perform a rotary position command even by a command voltage 0V by comparing a position command signal with an addition signal offset from a position detection signal. CONSTITUTION:Adding means adds a position detection signal representing the rotary position of a step motor and an offset signal having the prescribed offset amount, and outputs an addition signal. Comparing means compares the addition signal with a position command signal, and outputs a comparison signal. Signal processing means outputs a rotary command signal and a rotating direction command signal to step motor drive control means in response to the comparison signal to control a step motor. Thus, even if the position command signal is 0V or near 0V, an accurate rotary position control can be performed in response to the position command voltage, and unnecessary vibration does not arise even when the motor is stopped. |
