Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1997-05-15
1999-05-11
Martin, David
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318722, 318723, 318724, H02P1/46
Patent
active
059031298
ABSTRACT:
A permanent magnet synchronous motor having multiple-phase armature windings and a rotor is subjected to sensor-less control. Phase voltages are generated in response to voltage command values. The generated phase voltages are applied to the armature windings. Phase currents through the armature windings are detected. The detected phase currents depend on the voltage command values. An angular position and an angular velocity of the rotor are calculated from the detected phase currents. The voltage command values are adjusted in response to the calculated angular position and the calculated angular velocity of the rotor to implement feedback control of the motor. An angular velocity of the rotor is estimated from a time-domain variation in the calculated angular position of the rotor. A determination is made as to whether or not the calculated angular velocity of the rotor and the estimated angular velocity of the rotor are substantially equal to each other. The calculated angular position of the rotor is changed by a predetermined phase value and is thereby corrected when it is determined that the calculated angular velocity of the rotor and the estimated angular velocity of the rotor are not substantially equal to each other.
REFERENCES:
patent: 5057759 (1991-10-01), Ueda et al.
patent: 5225759 (1993-07-01), Endo et al.
patent: 5231338 (1993-07-01), Bulgarelli et al.
patent: 5726549 (1998-03-01), Okuno et al.
Watanabe, et al: A Sensorless Detecting Strategy of Rotor Position and Speed on Permanent Magnet Synchronous Motor, T. IEE Japan,. vol. 110-D, No. 11, 1990, pp. 1193-1200.
Obayashi Kazuyoshi
Okuno Tomoya
Sakakibara Hiroyuki
Tsuji Hiroya
Denso Corporation
Martin David
Nippon Soken Inc.
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