Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1984-03-12
1985-05-28
Witkowski, S. J.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, H02K 2904
Patent
active
045203024
ABSTRACT:
In a stepping motor having phase windings A, B, etc. the current through the phase windings is switched by a drive circuit including switching transistors T1.sub.A, T1.sub.B etc. in series with each individual phase winding. The transistors are controlled by a phase sequence logic circuit 14. A current flow characteristic is indicative of rotor position and is measured and used to operate the phase sequence logic circuit. The drive circuit may incorporate a chopper-type control operated through further transistors T2.sub.A, T2.sub.B etc. also in series with each phase winding. The current flow characteristic that is measured may be current rise time, current decay time or chopping frequency. The current characteristic being monitored may be the characteristic in an energized winding or else in an unenergized winding at low current level. The drive circuit may alternatively provide a constant voltage power supply to the phase windings in sequence with current being repeatedly switched at a low level to an unenergized winding to monitor rotor position.
REFERENCES:
patent: 4065708 (1977-12-01), Ulland et al.
patent: 4072888 (1978-02-01), Bechtle et al.
patent: 4303871 (1981-12-01), Berry
Acarnley Paul P.
Hill Roland J.
Bergmann Saul M.
National Research Development Corporation
Witkowski S. J.
LandOfFree
Stepping motors and drive circuits therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stepping motors and drive circuits therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stepping motors and drive circuits therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-870833