Control method and device for stepping motor and motor driver for stepping motor

摘要

Judgment, such as whether if the present rotation is normal, or whether if there is a risk of synchronicity loss, could be performed, and further, a most suitable control could be performed by detecting a change in drive current of a stepping motor, judging a load, and generating a signal.;A control device is comprised of: a driver 21 for generating a drive signal based on a command pulse given to a stepping motor 1 from a control portion 3; a electric current detection portion 22 for detecting drive current; a pulse signal transformation portion 23 for transforming the electric current detected at the electric current detection portion 22 into pulse signal; a control portion 3 for memorizing beforehand a control program in correspondence with information of a pulse width corresponding to the torque of the stepping motor, and the pulse width, measuring the width of the pulse signal transformed at the pulse signal transformation portion and comparing such width with the memorized pulse width, and generating a control signal corresponding to the pulse width.