Stepping motor drive system and method capable of stopping the r

Details Stepping motor drive system and method capable of stopping the r Stepping motor drive system and method capable of stopping the r

1986-02-13

1987-09-29

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

046971297

ABSTRACT:
In a stepping motor of the type having one or more sets of four phase windings on respective stator poles, with the four phase windings being excited sequentially to cause the rotation of a rotor having magnetic poles, a drive method and system are disclosed for stopping the rotor in exact angular positions required. Since the stator can less magnetically control the rotor when the latter is positioned with its magnetic poles in axact alignment with the stator poles, the stator windings are sequentially excited in such a manner that upon termination of the sequential excitation, the rotor comes to a stop in a position angularly displaced to a predetermined degree in a predetermined direction from a position of exact alignment with the stator poles. Basically, for stopping the rotor in such angular positions, at least two of the four phase windings are excited at a time with currents of predetermined different magnitudes.

REFERENCES:
patent: 3678481 (1972-07-01), Dalziel et al.
patent: 3748566 (1973-07-01), Brembs
patent: 4496892 (1986-01-01), Bugatto, Jr.

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