| 摘要 |
PURPOSE:To enable to shorten the decelerating time with a simple configuration by enabling to switch at more than two steps during the deceleration period the changing curve of the voltage for determining the drive pulse frequency and slowly forming the decelerating curve in high speed range and acutely forming it in low speed range. CONSTITUTION:A voltage controlled oscillator 8 of a voltage/frequency converter generates a signal of the frequency responsive to the input voltage signal B and supplies a pulse via a distributor 14 and a driver 15 to a pulse motor. A microprocessor 1 produces a start or stop command by the signal A. When a stop command is delivered during the operation at the high speed constant speed and the signal A is set to ''1'', a counter 10 starts counting the pulse signal C. At this time, the output E of the FF circuit 12 is ''0'', and the signal voltage B will drop along the slow time constant curve determined by the time constant of the resistor 5, and the capacitor 7. After the predetermined time from the start of deceleration, the output E of the FF circuit 12 becomes ''1'' by the counted output, the capacitor 7 is discharged via the resistors 4, 5 and the signal voltage will abruptly drop. |
