Novel model of synchronous reluctance motors including magnetic saturation and its sensorless control

In this paper, we discuss a mathematical model that accounts for magnetic saturation in synchronous reluctance motors and we derive a novel mathematical model called extended EMF. In synchronous reluctance motors, since large currents cause magnetic saturation, it is necessary for a precise sensorless control to give it every consideration. We propose here the extended EMF model, which accounts for magnetic saturation, and we apply it to an estimation position method. We also discuss the d-axis directions of a motor model and determine an appropriate d-axis direction for the sensorless control. The experimental results verified that position estimations differ because of differences between the two d-axis directions. The results also demonstrate the success of the proposed sensor-less control based on the extended EMF model.

[1]  Mehrdad Ehsani,et al.  Review of sensorless methods for brushless DC , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[2]  Thomas A. Lipo,et al.  Rotor position detection scheme for synchronous reluctance motor based on current measurements , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[3]  R. S. Ramshaw,et al.  Nonlinear Model of Synchronous Machines with Saliency , 1986, IEEE Transactions on Energy Conversion.

[4]  R.E. Betz,et al.  Aspects of the control of synchronous reluctance machines including saturation and iron losses , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[5]  Michele Pastorelli,et al.  Flux-observer-based high-performance control of synchronous reluctance motors by including cross saturation , 1999 .

[6]  M. Schroedl,et al.  Sensorless control of reluctance machines at arbitrary operating conditions including standstill , 1994 .

[7]  Shigeru Okuma,et al.  Sensorless control of an interior permanent magnet synchronous motor on the rotating coordinate using an extended electromotive force , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).

[8]  X. Xu,et al.  Vector control of a synchronous reluctance motor including saturation and iron loss , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[9]  Robert D. Lorenz,et al.  Transducerless position and velocity estimation in induction and salient AC machines , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[10]  Shinji Shinnaka.  Mirror-Phase Characteristics of Synchronous Reluctance Motor and Salient-Pole Orientation Methods for Sensorless Vector Controls , 2001 .

[11]  R.E. Betz,et al.  Sensorless vector controller for a synchronous reluctance motor , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[12]  A. Consoli,et al.  Low and zero speed sensorless control of synchronous reluctance motors , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[13]  Tomonobu Senjyu,et al.  Sensorless vector control of synchronous reluctance motors with disturbance torque observer , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[14]  Paolo Guglielmi,et al.  Position-sensorless control of the transverse-laminated synchronous reluctance motor , 2001 .

[15]  Ion Boldea,et al.  Sensorless control of the synchronous reluctance motor , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[16]  Thomas M. Jahns,et al.  A saturating lumped-parameter model for an interior PM synchronous machine , 2002 .

[17]  M. S. Arefeen,et al.  Sensorless position measurement in synchronous reluctance motor , 1994 .