| 摘要 |
PURPOSE:To minimizing damping of a rotor, by making it possible to select a new driving frequency of intermediate period of stepping drive according to conversion of number of steps. CONSTITUTION:Gate of an oscillator A is opened through a timing-and-gate circuit by a start signal generated by a revolution of a machine, a clock pulse A which was set to a frequency within a range of automatic starting frequency is put out from the oscillator A, and a stepping motor is driven by a motor driving circuit. When a value of output pulse count reading from an OR gate by a preset down counter became a set value of a digital switch D, the gate of the oscillator A is switched OFF and gate of an oscillator B become ON by a comparison circuit A, and a clock pulse B of the optimum frequency which minimized the motor damping is put out. When a value of count pulse became a set value of a digital switch E, the oscillator B is switched over to the oscillator A by the comparison circuit B. |
