Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1984-09-13
1986-03-18
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
361146, H02P 528, H01H 4700
Patent
active
045771430
ABSTRACT:
To eliminate the effect of hysteresis when electrical energy is supplied to an electromagnetic positioning element, for example to an electromagnetic valve, upon change in sign of the electrical energy which is provided from a previously occurring change, additional electrical energy is supplied if the change in energy is counter the direction of the magnetization curve. The extent of the additional energy may be at least as great as the gap between the ascending and descending branches of the hysteresis curves (H1, H2), or may be a quantity obtained by experience or measurement if the gap between the hysteresis curves is known or determinable. If the electromagnetic energy applied is in excess of that for reversal of magnetization, it may be applied for a period of time which is just long enough to permit remagnetization of a magnetic portion of the electromagnetic apparatus (11) but not long enough to cause change in a mechanical output thereof.
REFERENCES:
patent: 2441984 (1948-05-01), Armstrong
patent: 2963643 (1960-12-01), Brown
patent: 3683239 (1972-08-01), Sturman
patent: 4221163 (1980-09-01), Anderson
patent: 4306207 (1981-12-01), Tada
patent: 4359765 (1982-11-01), Mimura
patent: 4383234 (1983-05-01), Yatsushiro
Eschrich Gerhard
Juhasz Josef
Schwab Manfred
Keane Patrick C.
Robert & Bosch GmbH
Shoop Jr. William M.
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