Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1997-12-22
1999-01-12
Sircus, Brian
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, H02P 146
Patent
active
058595180
ABSTRACT:
A controller for a switched reluctance motor that does not utilize a sensor for detecting the rotational position of the rotor. The inductance of each field winding changes according to the rotational position of the rotor. The rotational position of the rotor of the motor is determined by measuring the inductance of each phase during periods when a minimum level of inductance for the phase is expected to occur. A series of voltage pulses are applied to the appropriate field winding during the appropriate period while the current produced in response to the voltage pulses is measured. The relationship between applied voltage, measured current, and time, is utilized to determine the inductance value as it decreases and then increases between positions of rotor alignment. Commutation to a next phase is performed based upon the measured inductance values. More particularly, a first voltage pulse is applied to an appropriate field winding after a commutation and a level of current induced by the voltage pulse is stored across a capacitor. Then, subsequent current levels produced by subsequent voltage pulses are compared to a predetermined threshold. The predetermined threshold ensures that the rotor is not stationary during the measurements. Once a current level exceeds the predetermined threshold, subsequent current levels are compared to the stored level. Upon a subsequent measured value which does not exceed the stored value, commutation to a next phase is performed. The number of degrees of rotation between removing the excitation voltage from a phase and alignment of the rotor with the corresponding phase is the phase advance. The phase advance is adjusted by controlling an offset value utilized for comparing the current levels to the stored value.
REFERENCES:
patent: 3501664 (1970-03-01), Veillette
patent: 3649845 (1972-03-01), Foch
patent: 3715920 (1973-02-01), Groberman et al.
patent: 3743906 (1973-07-01), Torok
patent: 3757183 (1973-09-01), Nola
patent: 4008421 (1977-02-01), Bird
patent: 4101821 (1978-07-01), Kirby
patent: 4110672 (1978-08-01), Deplante et al.
patent: 4162435 (1979-07-01), Wright
patent: 4223261 (1980-09-01), White
patent: 4482961 (1984-11-01), Kilner et al.
patent: 4520302 (1985-05-01), Hill et al.
patent: 4611157 (1986-09-01), Miller et al.
patent: 4618787 (1986-10-01), Jacksier et al.
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4739240 (1988-04-01), MacMinn et al.
patent: 4772839 (1988-09-01), MacMinn et al.
patent: 4777419 (1988-10-01), Obradovic
patent: 4806880 (1989-02-01), Laws
patent: 4825132 (1989-04-01), Gritter
patent: 4841251 (1989-06-01), Hartmann et al.
patent: 4866397 (1989-09-01), Kimyacioglu
patent: 4868478 (1989-09-01), Hedlund et al.
patent: 4896088 (1990-01-01), Jahns
patent: 4896089 (1990-01-01), Kliman et al.
patent: 4928043 (1990-05-01), Plunkett
patent: 4949364 (1990-08-01), Yukawa
patent: 4961038 (1990-10-01), MacMinn
patent: 4962339 (1990-10-01), Schauder
patent: 4962344 (1990-10-01), Bohrer
patent: 5023527 (1991-06-01), Erdman et al.
patent: 5032771 (1991-07-01), Kerkman et al.
patent: 5051680 (1991-09-01), Belanger
patent: 5066899 (1991-11-01), Nashiki
patent: 5072166 (1991-12-01), Ehsani
patent: 5097190 (1992-03-01), Lyons et al.
patent: 5107195 (1992-04-01), Lyons et al.
patent: 5111085 (1992-05-01), Stewart
patent: 5111150 (1992-05-01), Casey
patent: 5132599 (1992-07-01), Kono et al.
patent: 5172036 (1992-12-01), Cameron
patent: 5206543 (1993-04-01), Takita et al.
patent: 5218283 (1993-06-01), Wills et al.
patent: 5231339 (1993-07-01), Kishimoto et al.
patent: 5247237 (1993-09-01), Koyama et al.
patent: 5252905 (1993-10-01), Wills et al.
patent: 5278486 (1994-01-01), Kim
patent: 5304911 (1994-04-01), Anderson
patent: 5334923 (1994-08-01), Lorenz et al.
patent: 5345160 (1994-09-01), Corniere
patent: 5376866 (1994-12-01), Erdman
patent: 5410188 (1995-04-01), Segaram
patent: 5428285 (1995-06-01), Koyama et al.
patent: 5451832 (1995-09-01), Cameron et al.
patent: 5689167 (1997-11-01), Vitunic
Gottlieb, I. M., "Electric Motors & Control Techniques", 2nd Ed., pp. 147-149, 235-247, TAB Books, 1994.
TJE Miller, "Switched Reluctance Motors and Their Control", pp. 85-113, Magna Physics Publishing and Clarendon Press, Oxford, 1993.
Micro Linear Corporation
Sircus Brian
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