Inter-Phase Magnetic Coupling Effects on Sensorless SR Motor Control
Control of commutation of switched reluctance (SR)
motor has been an area of interest for researchers for sometime now
with mixed successes in addressing the inherent challenges. New
technologies, processing schemes and methods have been adopted to
make sensorless SR drive a reality. There are a number of
conceptual, offline, analytical and online solutions in literature that
have varying complexities and achieved equally varying degree of
robustness and accuracies depending on the method used to address
the challenges and the SR drive application. Magnetic coupling is
one such challenge when using active probing techniques to
determine rotor position of a SR motor from stator winding. This
paper studies the effect of back-of-core saturation on the detected
rotor position and presents results on measurement made on a 4-
phase SR motor. The results shows that even for a four phase motor
which is excited one phase at a time and using the electrically
opposite phase for active position probing, the back-of-core
saturation effects should not be ignored.
[1] Kawamura, A., "Survey of Position Sensorless Switched Reluctance
Motor Control", Proceedings of the 20th International Conference in
Industrial Electronics, Control and Instrumentation, 5th-9th Sept. 1194,
vol. 3, pp1595-1598.
[2] Fahimi B., Suresh G., Ehsanil M., "Review of Sensorless Control
Methods in Switched Reluctance Motor Drives", Proceedings of
International Conference on Industrial Applications, 10th-12th Oct. 2000,
Rome, Italy, vol. 3, pp1850-1857.
[3] Suresh G., Fahimi B., Ehsani M., "Improvement of the Accuracy and
Speed Range in Sensorless Control of Switched Reluctance Motors",
Proceedings of the 13th International Conference on Applied Electronics
and Exposition, 15th-19th Feb. 1998, Anatheim,CA, USA, vol. 2, pp771-
777.
[4] Mvungi NH, and Stephenson JM, "Accurate Sensorless Rotor Position
Detection in an SR Motor", Proceedings European Power Electronics
Conference, 1992, vol. 1, pp390-393.
[5] Acarnley PP, Hill RJ, Hooper CW, "Detection of rotor position in
stepping and switched reluctance motors by monitoring of current
waveforms," IEEE Trans. Ind. Electron., vol. 32, pp. 215-222, June
1985.
[6] Senjyu T, Muhando EB, Yona A, Urasaki N, Kinjo H, Funabashi T,
"Maximum Wind Power Capture by Sensorless Rotor Position and Wind
Velocity Estimation from Flux Linkage and Sliding Observer",
International Journal of Emerging electric Power Systems, vol. 8, Issue
2, 2007, pp 1-19.
[7] Pickup IED, "Linear and Non-linear Theoretical Representations of
Machine Flux-linkages in a Multi-stator Variable Reluctance Stepping
Motor and their Use in the Prediction of Dynamic Characteristics",
Proceedings of the 4th ASIMCSD, Urbana, Illinois, 1975, pp B-1 B-15.
[1] Kawamura, A., "Survey of Position Sensorless Switched Reluctance
Motor Control", Proceedings of the 20th International Conference in
Industrial Electronics, Control and Instrumentation, 5th-9th Sept. 1194,
vol. 3, pp1595-1598.
[2] Fahimi B., Suresh G., Ehsanil M., "Review of Sensorless Control
Methods in Switched Reluctance Motor Drives", Proceedings of
International Conference on Industrial Applications, 10th-12th Oct. 2000,
Rome, Italy, vol. 3, pp1850-1857.
[3] Suresh G., Fahimi B., Ehsani M., "Improvement of the Accuracy and
Speed Range in Sensorless Control of Switched Reluctance Motors",
Proceedings of the 13th International Conference on Applied Electronics
and Exposition, 15th-19th Feb. 1998, Anatheim,CA, USA, vol. 2, pp771-
777.
[4] Mvungi NH, and Stephenson JM, "Accurate Sensorless Rotor Position
Detection in an SR Motor", Proceedings European Power Electronics
Conference, 1992, vol. 1, pp390-393.
[5] Acarnley PP, Hill RJ, Hooper CW, "Detection of rotor position in
stepping and switched reluctance motors by monitoring of current
waveforms," IEEE Trans. Ind. Electron., vol. 32, pp. 215-222, June
1985.
[6] Senjyu T, Muhando EB, Yona A, Urasaki N, Kinjo H, Funabashi T,
"Maximum Wind Power Capture by Sensorless Rotor Position and Wind
Velocity Estimation from Flux Linkage and Sliding Observer",
International Journal of Emerging electric Power Systems, vol. 8, Issue
2, 2007, pp 1-19.
[7] Pickup IED, "Linear and Non-linear Theoretical Representations of
Machine Flux-linkages in a Multi-stator Variable Reluctance Stepping
Motor and their Use in the Prediction of Dynamic Characteristics",
Proceedings of the 4th ASIMCSD, Urbana, Illinois, 1975, pp B-1 B-15.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:63331", author = "N. H. Mvungi", title = "Inter-Phase Magnetic Coupling Effects on Sensorless SR Motor Control", abstract = "Control of commutation of switched reluctance (SR)
motor has been an area of interest for researchers for sometime now
with mixed successes in addressing the inherent challenges. New
technologies, processing schemes and methods have been adopted to
make sensorless SR drive a reality. There are a number of
conceptual, offline, analytical and online solutions in literature that
have varying complexities and achieved equally varying degree of
robustness and accuracies depending on the method used to address
the challenges and the SR drive application. Magnetic coupling is
one such challenge when using active probing techniques to
determine rotor position of a SR motor from stator winding. This
paper studies the effect of back-of-core saturation on the detected
rotor position and presents results on measurement made on a 4-
phase SR motor. The results shows that even for a four phase motor
which is excited one phase at a time and using the electrically
opposite phase for active position probing, the back-of-core
saturation effects should not be ignored.", keywords = "Sensorless, SR motor, saturation effects, detection.", volume = "1", number = "11", pages = "682-4", }