Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1997-01-31
1999-05-11
Ro, Bentsu
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318439, H02P6/16
Patent
active
059031280
ABSTRACT:
If the magnitude of a voltage command vector to a motor driver is smaller than a preset value in a control period, in each of a predetermined number of subsequent control periods (a compensation period), a pulse voltage vector is added to the voltage command vector so as to make substantially zero the average value of the added pulse voltage vectors during the compensation periods, and the compensated voltage command vector is used for the subsequent calculation. Also, two direction data for each phase winding are stored at the center of each of the two dead times following the edges of a voltage command pulse in each control period. An estimated phase voltage is calculated from the last voltage command pulse width, a phase voltage fluctuation during the two dead time of each control period and the stored direction data. The rotor position angle is precisely calculated from the estimated phase voltage.
REFERENCES:
patent: 5504404 (1996-04-01), Tamaki et al.
patent: 5598081 (1997-01-01), Okamura et al.
patent: 5656911 (1997-08-01), Nakayama et al.
"A Sensorless Detecting Strategy of Rotor Position and Speed on Permanent Magnet Synchronous Motor" by H. Watanabe et al; T.IEE Japan, vol. 110-D, No. 11, 1990; pp., 1193-1200 (w/English abstract).
Obayashi Kazuyoshi
Okuno Tomoya
Sakakibara Hiroyuki
Tsuji Hiroya
Denso Corporation
Nippon Soken Inc.
Ro Bentsu
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