Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1997-02-27
1998-12-29
Ro, Bentsu
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318254, H02P 616
Patent
active
058545484
ABSTRACT:
An electrical angle detecting device for detecting the electrical angle of a synchronous motor utilizes differences in inductance between phases with the angle of a rotor 50 to determine electrical angle. Voltage is applied across predetermined phases, the currents Iu, Iv, Iw flowing through U, V, W phases as a function of the differing inductance with angle of the rotor 50 are simultaneously detected, and the electrical angle is determined from relationships among the three currents stored in memory beforehand. In a first stage, the electrical angle is determined in the 0-.pi. range or the .pi.-2.pi. range by an approximation calculation and in a second stage the asymmetry of the maximum currents produced by the voltage applied across the phases is utilized to ascertain the range in which the electrical angle falls. the electrical angle can thus be unambiguously ascertained to enable sensorless detection of rotor position (electrical angle) even when the rotor is at rest or is rotating slowly.
REFERENCES:
patent: 5051680 (1991-09-01), Belanger et al.
patent: 5254914 (1993-10-01), Dunfield et al.
patent: 5448149 (1995-09-01), Ehsani et al.
patent: 5565752 (1996-10-01), Jansen et al.
patent: 5569994 (1996-10-01), Taylor et al.
patent: 5608300 (1997-03-01), Kawabata et al.
The Semiconductor Power Conversion (SPC) Meeting, 1990, Japan. SPC 90-21, pp. 87-94, with English Abstract.
N.M. Mvungi, et al., European Power Electronics and Applications, vol. 4, pp. 390-393, "Sensorless Rotor Position Detection in an SR Motor", 1991.
Kawabata Yasutomo
Taga, deceased Yoshiaki
Taga, heir Shigeo
Taga, heiress Takiko
Taga, heiress Tomoyo
Ro Bentsu
Toyota Jidosha & Kabushiki Kaisha
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