| 摘要 |
PURPOSE:To control a speed according to a desired deceleration pattern by controlling a drive means based on a difference between a speed command and a rotation number detection signal. CONSTITUTION:A deviation amplifier 13 outputs a deviation i5 between a speed command 12 and a rotation number detection signal i4 to an absolute value amplifier circuit 16 and a zero-cross comparator 20. A PWM comparator 18 compares the output of the amplifier 16 with a triangular wave 17, and outputs a PWM control signal i7 to a switching circuit 19. A rotating direction correcting circuit 21 outputs a signal i13 for correcting the rotating direction of a motor to the circuit 19 by a signal i8 from the comparator 20, a rotating direction command signal i9 and a rotating direction signal i12 from a rotating direction discriminator 23. Thus, its speed can be controlled according to a desired deceleration pattern. |
