| 摘要 |
PURPOSE:To position a step motor under control with a predetermined speed pattern without judging a deceleration point by comparing the predetermined cushion voltage waveform with residual signal voltage corresponding to the residual feed amount of the moving distance and selecting lower voltage. CONSTITUTION:A subtraction counter 45 and a cushion circuit 52 are operated by a start signal, and a cushion signal is produced from the circuit 52 as designated by 100 102 104 106. The subtraction counter 46 receiving set feed amount from digital switch 44 outputs the residual amount of moved distance through a D/A converter 48 to a function generator 50, which in turn produces a voltage signal indicated by 100 108 110 106. A minimum selector 54 selects lower voltage by comparing the output voltage from the cushion circuit 52 with that of the function generator 50, and a minimum clamp circuit 56 will thus produce a voltage pattern of shaded part, and a VF converter produces a pulse train voltage signal of the above pattern as a step motor drive signal. |
