Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1998-02-05
2000-03-07
Ip, Paul
Electricity: motive power systems
Switched reluctance motor commutation control
318439, 318138, H02P 506
Patent
active
060344938
ABSTRACT:
An electronically commutated brushless DC motor primarily for fractional horsepower applications of the type where at any instant one motor winding is unpowered and used to detect back EMF zero-crossings which information is used to initiate winding commutations. The duration of the pulse produced in this winding due to dissipation of stored energy by free-wheel diodes in parallel with the commutation devices after supply of current has been removed from this winding is used to provide a measure of motor current. This allows for simplified commutation device current limiting circuits and is available for control purposes which are a function of motor torque. There is also disclosed a method for maximizing useful power output by reducing the phase angle between the motor current and the back EMF. This is accomplished by introducing a delay in commutating the motor windings beyond the occurrence of each back EMF zero-crossing, with the delay being a function of the time between commutations.
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Boyd John H.
Duncan Gerald
Perry Michael Thomas George
Fisher & Paykel Limited
Ip Paul
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