Sensorless Control of a Six-Phase Induction Motors Drive Using FOC in Stator Flux Reference Frame

In this paper, a direct torque control - space vector modulation (DTC-SVM) scheme is presented for a six-phase speed and voltage sensorless induction motor (IM) drive. The decoupled torque and stator flux control is achieved based on IM stator flux field orientation. The rotor speed is detected by on-line estimating of the rotor angular slip speed and stator vector flux speed. In addition, a simple method is introduced to estimate the stator resistance. Moreover in this control scheme the voltage sensors are eliminated and actual motor phase voltages are approximated by using PWM inverter switching times and the dc link voltage. Finally, some simulation and experimental results are presented to verify the effectiveness and capability of the proposed control scheme.

Authors:

• G. R. Arab Markadeh
• J. Soltani
• N. R. Abjadi
• M. Hajian

Keywords:

• Stator FOC
• Multiphase motors
• sensorless.

References:

[1] E. Levi, S. N. Vukosavic and M. Jones, "Vector control schemes for series-connected six-phase two-motor drive systems", IEE Proc.-Electr. Power Appl., Vol. 152, No. 2, March 2005.
[2] M. Jones, S. N. Vukosavic, E. Levi and A. Iqbal, "A Six-Phase Series-
Connected Two-Motor Drive With Decoupled Dynamic Control", IEEE
Trans. on Ind. Appl., Vol. 41, No. 4, July/August 2005.
[3] R. H. Nelson and P. C. Krause, "Induction machine analysis for arbitrary displacement between multiple winding sets," IEEE Trans. Power App. Syst., vol. PAS-93, no. 3, pp. 841-848, may/Jun. 1974.
[4] Y. Zhao and T. A. Lipo, "Space Vector PWM Control of Dual Threephase
Induction Machine Using Vector Space Decomposition", IEEE
Trans. on Ind. Appl., Vol. 31, No. 5, Sep./Oct. 1995, pp. 1100-1109.
[5] R. Bojoi, M. Lazzari, F. Profumo and A. Tenconi, "Digital field oriented
control for dual three-phase induction motor drives," in Proc. IEEE-IAS
Annu. Meeting, Pittsburgh, PA, 2002, CD-ROM, Paper 22P1.
[6] R. Bojoi, M. Lazzari, F. Profumo and A. Tenconi, "Digital Field-Oriented Control for Dual Three-Phase Induction Motor Drives", IEEE
Trans. On INDUSTRY Appl., Vol. 39, No. 3, May/June 2003, pp. 752-760.
[7] R. Krishnan and F.C. Doran, "Study of Parameter Sensitivity in
High Performance Invereter-Fed Induction Motor Drive
System". IEEE Trans. Ind. Application, vol. 23, no. 4, 1987, pp. 623-635.
[8] Radu Bojoi, Member, IEEE, Paolo Guglielmi, Member, IEEE, and
Gian-Mario Pellegrino, "Sensorless Direct Field-Oriented Control of
Three-Phase Induction Motor Drives for Low-Cost Applications", IEEE
Trans. on Ind. Appl., Vol. 44, No. 2, March/April 2008, pp. 475-481.
[9] H. Jun, B. R. Duggal, M. Vilathgamuwa, "A MRAS-based speed sensorless field oriented control of induction motor with on-line stator
resistance tuning", International Conference on Power Electronics and
Energy Systems for Industrial Growth, Perth, Australia, December 1998,
Vol.1, pp. 38-43.
[10] M. Ghanes, J. De Leon, A. Glumineau, "Cascade and high-gain observers comparison for sensorless closed-loop induction motor
control", IET Control Theory Appl., 2008, Vol. 2, No. 2, pp. 133-150.
[11] M. Arkan, "Sensorless speed estimation in induction motor drives by
using the space vector angular fluctuation signal", IET Electr. Power
Appl., 2008, Vol. 2, No. 2, pp. 113-120.
[12] Koichiro Nagata, Toshiaki Okuyama, Haruo Nemoto, and Toshio
Katayama, "A Simple Robust Voltage Control of High Power Sensorless Induction Motor Drives With High Start Torque Demand", IEEE Trans.
on Ind. Appl., Vol. 44, No. 2, March/April 2008, pp. 604-611.
[13] Dramane Traoré, Franck Plestan, Alain Glumineau, and Jesus de Leon,
"Sensorless Induction Motor: High-Order Sliding-Mode Controller and Adaptive Interconnected Observer", IEEE Trans. on Ind. Electr., Vol. 55, No. 11, Nov. 2008, pp. 3818-3827.
[14] Hassan K. Khalil, Elias G. Strangas, and Sinisa Jurkovic, "Speed
Observer and Reduced Nonlinear Model for Sensorless Control of
Induction Motors", IEEE Trans. on Control Systems Tech., Vol. 17, No.
2, March 2009, pp. 327-339.
[15] S. Doki, Y. Kinpara, S. Okuma, "Unified interpretation of indirect and direct vector control", PCC-Yokohama '93, 1993, pp. 297-302.