Stepper-motor control method

Details Stepper-motor control method Stepper-motor control method

1997-10-20

1998-11-17

Masih, Karen

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318798815-, 318254, 318138, 318439, 318432434-, 318609, 318610, 388906, 388930, G05B 1940

Patent

active

058381325

ABSTRACT:
A device for outputting a suitable rotation torque relative to a load torque or actual torque exerted on a stepper-motor when the stepper-motor is used as a drive of an image processing device. The output torque of the stepper-motor depends on a supply current to the stepper-motor. CPU determines a suitable supply current using a table in ROM so that the stepper-motor is able to rotate at an optimum rotation torque. To this end, CPU sends a particular signal to the motor driver so that an appropriate supply current is supplied to the excitation phases A/B of the stepper-motor. The CPU determines the load torque based on an integrated current fed to the stepper-motor during a particular period. The CPU calculates difference between the load torque and rotation torque and determines the signal to be applied to the motor driver based on the torque difference.

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