Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1995-04-21
1997-06-10
Ip, Paul
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318138, 318254, 318696, H02K 1910, H02P 800
Patent
active
056379749
ABSTRACT:
A device for controlling a 4-phase 8-stator pole/6 rotor pole switched reluctance machine includes a microcontroller, a converter circuit for energizing the stator windings of the switched reluctance machine, four Hall sensors adapted to detect rotor position to a resolution of 15 mechanical degrees, a phase current sensor, and a phase voltage sensor. The controller is programmed to implement a rotor position estimator for generating an estimated rotor position signal corresponding to the position of the rotor. The estimator is implemented using an observer-based state variable motor model, and is responsive to the measured phase voltage, the measured phase current, and the transitions generated by the Hall sensors. The estimated rotor position signal is determined by running the observer model in parallel with the physical motor. The observer uses a phase current error signal, and a position error signal generated using the low resolution position transitions, to force the estimated rotor position state variable to converge. The generated estimated rotor position signal is substantially continuously-valued and is used by a commutation means programmed in the controller for controlling commutation of the machine phases.
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Ip Paul
ITT Automotive Electrical Systems Inc.
Lewis J. Gordon
Twomey Thomas N.
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