Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1989-07-26
1990-12-18
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318432, 318481, 236DIG9, G05D 2900
Patent
active
049788965
ABSTRACT:
Apparatus and method for controlling a motor having a stationary assembly with a plurality of winding stages for carrying motor current and further having a rotatable assembly in driving relation with a blower in an air handling system. The apparatus provides control of the blower speed over a range of static pressure variations to maintain relatively constant preselected rate of air flow in the system. The apparatus receives a preselected flow rate signal representing the preselected air flow rate. A microprocessor, responsive to both the preselected flow rate signal and a speed signal, generates a desired torque signal which is a function of both the preselected flow rate signal and the speed signal. The desired torque signal is compared to a signal representing motor torque and a comparison signal representing the comparison is generated. An IC control applies a motor voltage to one or more of the winding stages at a time in accordance with the comparison signal and commutates the winding stages in a preselected sequence to rotate the rotatable assembly. As a result, the blower is driven by varying the motor torque according to motor speed to maintain substantially constant air flow in the system at the preselected rate substantially independent of variations in the static pressure.
REFERENCES:
patent: 4504881 (1985-03-01), Wada et al.
patent: 4648551 (1987-03-01), Thompson et al.
patent: 4806833 (1989-02-01), Young
patent: 4818924 (1989-04-01), Burney
patent: 4858676 (1989-08-01), Bolfik et al.
patent: 4860231 (1989-08-01), Ballard et al.
General Electric Company
Krisher, Jr. Ralph E.
Ro Bentsu
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