Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1994-07-15
1996-11-05
Martin, David S.
Electricity: motive power systems
Switched reluctance motor commutation control
318439, H02K 2300
Patent
active
055720978
ABSTRACT:
In a method for aligning a rotor of a polyphase dc motor in preparation for starting the motor. a first energization signal is applied to field coils of the motor in a first predetermined phase for a first predetermined time. Then, a second energization signal having a second predetermined phase displaced from the first phase by a predetermined amount is applied to the field coils for a second predetermined time period. In one embodiment, the second energization signal is applied to produce a maximum torque upon the rotor when the rotor is positioned at a location determined by the first energization signal. In the case of a three phase motor, the second energization signal is displaced by two commutations from the first energization signal. Circuitry for aligning a rotor of a polyphase dc motor in preparation for startup is also presented having circuitry for applying a first signal to selected field coils of the polyphase dc motor having a first commutative phase for a first predetermined time, and circuitry for applying a second signal to other selected field coils of the polyphase dc motor having a second commutative phase for a second predetermined time.
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Arrambide Joseph C.
Bachand Richard A.
Jorgenson Lisa K.
Martin David S.
SGS-Thomson Microelectronics Inc.
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