Stator resistance adaptation in sensorless PMSM drives

Electricity: motive power systems – Positional servo systems – 'reset' systems

Reexamination Certificate

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C318S632000, C318S701000

Reexamination Certificate

active

07969112

ABSTRACT:
A method of estimating stator resistance of a permanent magnet synchronous machine, when the permanent magnet synchronous machine is controlled with an inverter using a control system having an adaptive observer which is augmented with a signal injection, the adaptive observer having a stator resistance estimate ({circumflex over (R)}s) as a parameter, in which method an error signal (ε) is obtained from the signal injection, a speed correction term (ωε) is calculated from the error signal (ε), the rotor position estimate is corrected using the speed correction term (ωε) in the adaptive observer, whereby the error signal (ε) is driven to zero. The method comprises the step of correcting the value of the stator resistance estimate ({circumflex over (R)}s) in the adaptive observer when the speed correction term (ωε) differs from zero.

REFERENCES:
patent: 2005/0113052 (2005-05-01), Rabinovich et al.
Antti Piippo et al., “Analysis of an Adaptive Observer for Sensorless Control of PMSM Drives”, Industrial Electronics Society, Nov. 6, 2005, pp. 1474-1479.
Matthew J. Corley et al., “Rotor Position and Velocity Estimation for a Salient-Pole Permanent Magnet Synchronous Machine at Standstill and High Speeds”, IEEE Transaction on Industry Applications, vol. 34, No. 4, Aug. 4, 1998, pp. 784-789.
Antti Piippo et al., “Adaptive Observer Combined with HF Signal Injection for Sensorless Control of PMSM Drives”, Electric Machine and Drives, May 15, 2005, pp. 674-681.
Antti Piippo et al., “Sensorless control of PMSM drives using a combination of voltage model and HF signal injection”, Industry Applications Conference, vol. 2, Oct. 3, 2004, pp. 964-970.
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Simon D. Wilson et al., “Resistance Estimation for Temperature Determination in PMSMs through Signal Injection”, Proc. IEEE IEMDC'05, May 2005, pp. 735-740.
Kyu-Wang Lee et al., “An Online Identification Method for Both Stator Resistance and Back-EMF Coefficient of PMSMs Without Rotational Transducers”, IEEE Trans. Ind. Electron, vol. 51, No. 2, Apr. 2004, pp. 507-510.
Shinji Ichikawa et al., “Sensorless Control of Permanent-Magnet Synchronous Motors Using Online Parameter Identification Based on System Identification Theory”, IEEE Trans. Ind. Electron, vol. 53, No. 2, Apr. 2006, pp. 363-372.
European Search Report dated Oct. 15, 2007.

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