Microstepping of an unipolar stepping motor

Details Microstepping of an unipolar stepping motor Microstepping of an unipolar stepping motor

1988-02-18

1989-08-08

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 360 7813, H02P 800

Patent

active

048556602

ABSTRACT:
High resolution microstepping of an unipolar stepping motor is accomplished by applying from a look-up table the values of the SINE and COSINE of a given angle to the control circuit of a unipolar stepping motor. The difference between the present position and the desired position is calculated and depending upon the magnitude of the difference, the degree of microstepping is determined from four steps per ninety electrical degrees of motor rotation to thirty-two steps. By such selection, the positioning of the output shaft of the motor is smoothly and accurately accomplished.

REFERENCES:
patent: 4518907 (1985-05-01), Giguere
patent: 4731680 (1988-03-01), Moriyama et al.
patent: 4734847 (1988-03-01), Hunter

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