Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1987-02-17
1988-08-09
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
H02P 602
Patent
active
047633476
ABSTRACT:
Control system for an electronically commutated motor having a stationary assembly with a plurality of winding stages and further having a rotatable assembly. The control system is adapted to be supplied with an externally derived first pulse width modulated series of pulses having a first duty cycle which is subject to sudden changes which would cause a substantial inrush current to the motor if used directly for control purposes. The control system includes circuitry for generating a second series of pulses and modulating their width in response to the first series of pulses to produce a second pulse width modulated series of pulses that has a second duty cycle which varies less rapidly over time than the first duty cycle varies when the first duty cycle changes suddenly. Further included is circuitry for applying a voltage to one or more of the winding stages at a tine in accordance with the second pulse width modulated series of pulses and commutating the winding stages in a preselected sequence to rotate the rotatable assembly. In this way, inrush current to the motor is substantially reduced when the first duty cycle changes suddenly. Further control circuitry, electronically commutated motor systems, blower apparatus and methods are also disclosed.
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SCR Manual, GE 1979, pp. 259, 262, 263, Sixth Ed.
General Electric Company
Krisher, Jr. Ralph E.
Ro Bentsu
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