Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1991-08-30
1992-12-01
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318809, 318701, H02P 540
Patent
active
051682028
ABSTRACT:
Method and apparatus for closed-loop microprocessor control of an electric motor having one or more phase windings and commutation of the phases by rotor/stator position sensors to provide improved efficiency in motor operation wherein the conduction angle of a phase energization of the motor at a given speed of operation is measured, the phase advance adjusted in a positive or negative direction to obtain a subsequent conduction angle, and the two sequential conduction angles compared. Based on the comparison, further phase advance and comparison of sequentially measured conduction angles is carried out, in positive or negative directions of phase advance, to maintain a minimum conduction angle and improve operating efficiency of the motor.
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IEE Power Electronics & Variable-Speed Drives Conference, London, Jul. 1988; paper entitled "Four-Quadrant Brushless Reluctance Motor Drive," T. J. E. Miller, et al. published Jul. 1988 (4 pages).
IEE Power Electronics & Variable-Speed Drives Conference, London, Jul. 1990; paper entitled "A New Control IC For Switched Reluctance Motor Drives," T. J. E. Miller, et al. published Jul. 1990 (5 pages).
Bradshaw Scott G.
Frye Jesse C.
Cabeca John W.
Platt Saco Lowell Corporation
Shoop Jr. William M.
Wilburn, Jr. Luke J.
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