Sensorless rotor position monitoring in reluctance machines

Details Sensorless rotor position monitoring in reluctance machines Sensorless rotor position monitoring in reluctance machines

1996-12-19

1998-08-11

Strecker, Gerard R.

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

H02P 705

Patent

active

057931798

ABSTRACT:
A method of and apparatus for monitoring rotor position in a reluctance machine includes determining the rate of change of current at a particular point at which current in the winding is arranged to freewheel. Preferably the point coincides with alignment of a rotor and a stator pole such that the rate of change of current is predicted to be zero. The magnitude and polarity of any variation from the predicted rate of change indicates a rotor position removed from the actual rotor position and whether it is in advance of, or retreated from, the predicted position.

REFERENCES:
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patent: 5530333 (1996-06-01), Turner
patent: 5537019 (1996-07-01), Van Sistine et al.
patent: 5627445 (1997-05-01), Webster
J.P. Lyons, et al., "Flux/Current Methods For SRM Rotor Position Estimation," Institute of Electrical and Electronics Engineers, vol. 1, Jan. 1, 1991, pp. 482-487.
C. Pollock, et al., "Acoustic Noise Cancellation Techniques for Switched Reluctance Drives," Institute of Electrical and Electronics Engineers, vol. 1, Oct. 8, 1995, pp. 448-455.
Stephenson, Dr. J.M. "The Characteristics, Design and Applications of Switched Reluctance Motors and Drives." PCIM '93 Conference & Exhibition, Nurnberg, Germany, Jun. 21-24, 1993.
Ray, W.F., et al. "Sensorless Methods for Determining the Rotor Position of Switched Reluctance Motors." EPE Brighton, 1993.
Mvungi, N.M., et al. "Accurate Sensorless Rotor Position Detection in an SR Motor." EPE Firenze, 1991.

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