Stepping motor control method including varying the number of sp

Details Stepping motor control method including varying the number of sp Stepping motor control method including varying the number of sp

1994-12-23

1996-11-05

Cabeca, John W.

Electricity: motive power systems

Open-loop stepping motor control systems

318599, 318603, G05B 1940

Patent

active

055721052

ABSTRACT:
A device for controlling the power supplied to windings of a stepping motor includes a pulse generator for splitting one step drive period of the motor into a plurality of sections, the number of sections and increasing or decreasing depending upon the drive frequency. The pulse generator, also sets the duty cycle of a pulse applied to the motor. The device also includes a stepping motor drive circuit for exciting each phase of the motor with a current determined by the duty cycle of pulse, and a duty changing device for changing the duty cycle for each of plural sections in one excitation phase of the stepping motor, wherein a current wave input into the motor can be maintained as a sinusoidal wave from low-speed rotation to high-speed rotation of the motor by changing the number of sections in excitation depending upon serial drive operations, thereby achieving motor control with less rotation inconsistencies and less noise.

REFERENCES:
patent: 3992657 (1976-11-01), Akamatsu
patent: 4326278 (1982-04-01), Shida et al.
patent: 4625667 (1986-12-01), Hammermann
patent: 5111349 (1992-05-01), Moon
patent: 5150030 (1992-09-01), Ito et al.
patent: 5327063 (1994-07-01), Miyakawa

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