Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1982-06-14
1984-07-03
Witkowski, S. J.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, H02K 2902
Patent
active
044581912
ABSTRACT:
A stepping motor drive circuit having pairs of magnetically coupled phase windings (1, 3 and 2, 4), comprises current chopping control circuits (23, 24) for controlling the on/off switching of a plurality of driving transistors (5, 6, 7, 8) each coupled to a respective phase winding, and the circuits associated with each switching transistor for reducing their storage times and hence switching losses. More particularly, with reference to the switching transistor (5), the related circuit for storage time reduction comprises a series connected capacitor (25) and a diode (45). The circuit connects between one terminal of one winding (2) of the pair of phase windings which is magnetically coupled to the one winding (1) of the other pair connected to such switching transistor (5) and to the base of such transistor (5). As soon as the transistor (5) is caused to switch from ON to OFF, the circuit applies a reverse voltage pulse to the base of the transistor (5) causing a fast transition towards the cutoff region. Besides improving the stepping motor efficiency for a high chopping frequency, the arrangement makes it possible to use switching transistors that dissipate power and are less expensive.
REFERENCES:
patent: 3486096 (1969-12-01), Van Cleave
patent: 4358725 (1982-11-01), Brendemuehl
Bergmann Saul M.
Driscoll Faith F.
Honeywell Information Systems Italia
Prasinos Nicholas
Witkowski S. J.
LandOfFree
Step motor drive circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Step motor drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Step motor drive circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1632330