Method and circuit for driving a stepping motor

Details Method and circuit for driving a stepping motor Method and circuit for driving a stepping motor

1986-12-08

1988-04-12

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 307271, H02P 800

Patent

active

047377003

ABSTRACT:
A method and circuit for driving a stepping motor which is driven by a motor clock output having a time variable frequency. So as to generate the time varying frequency, the constant frequency of a basic clock output is divided by constant first factor and is multiplied by a time variable second factor which is in the range between zero and the first factor. A transfer clock sequence is derived from the basic clock output by a division factor. The second factor is changed by a prescribed increment with the frequency of the transfer clock output at the respective clock times and this prescribed increment determines the frequency change of the motor clock output per clock interval. In this manner, the unavoidable frequency discontinuities can be maintained small and constant over the full frequency range of the motor clock output even by when the frequency of the basic clock output is not high whereby a reliable run-up and a reliable braking of the stepping motor are assured without stepping errors.

REFERENCES:
patent: 4084246 (1978-04-01), Schwartz
patent: 4234830 (1980-11-01), Cannon
patent: 4241301 (1980-12-01), Pohlig
patent: 4271384 (1981-06-01), Beling et al.
patent: 4555653 (1985-11-01), Nawata et al.
Electronik Vo. 31, No. 16, Aug. 1982, pp. 35-38, Munich, W. Kuntz, "Mehrachsige, schnelle Schrittmotorsteuerung min beliebigem Frequencz-Zeit-Profil".

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