Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1982-08-24
1985-10-08
Shoop, William M.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318341, 318439, H02K 2300, H02P 118
Patent
active
045462933
ABSTRACT:
This invention relates to a motor control system for a brushless DC motor having an inverter responsively coupled to the motor control system and in power transmitting relationship to the motor. The motor control system includes a motor rotor speed detecting unit that provides a pulsed waveform signal proportional to rotor speed. This pulsed waveform signal is delivered to the inverter to thereby cause an inverter fundamental current waveform output to the motor to be switched at a rate proportional to said rotor speed. In addition, the fundamental current waveform is also pulse width modulated at a rate proportional to the rotor speed.
A fundamental current waveform phase advance circuit is controllingly coupled to the inverter. The phase advance circuit is coupled to receive the pulsed waveform signal from the motor rotor speed detecting unit and phase advance the pulsed waveform signal as a predetermined function of motor speed to thereby cause the fundamental current waveform to be advanced and thereby compensate for fundamental current waveform lag due to motor winding reactance which allows the motor to operate at higher speeds than the motor is rated while providing optimal torque and therefore increased efficiency.
REFERENCES:
patent: 3908130 (1975-09-01), Lafuze
patent: 4048554 (1977-09-01), Stich
patent: 4249116 (1981-02-01), Hieda
patent: 4295085 (1981-10-01), Lafuze
patent: 4338558 (1982-07-01), Okamatsu
Faulkner Dennis T.
Peterson William J.
Keane Patrick C.
Killingsworth Ted E.
Shoop William M.
Sundstrand Corporation
Wanner James A.
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