Position sensorless synchronous reluctance motor drive using the stator phase voltage third harmonic

A direct field orientation controller for synchronous reluctance motors based on determination of the spiral position of the air gap flux from the third harmonic component of the stator phase voltages is presented. The control utilizes the spatial saturation harmonic components rotating at synchronous frequency that are generated in the air gap flux when the machine operates in a saturated condition. When the machine is wye connected, the sum of three-phase voltages results in a signal dominated by the third harmonic component. Using this signal, a completely sensorless drive is implemented which can successfully synchronously start the reluctance motor from zero speed. Extensive experimental results showing the effect of different estimation schemes and practical problems of detecting the flux position from the harmonic voltage signal are presented.<<ETX>>

[1]  Alfredo Vagati,et al.  A reluctance motor drive for high dynamic performance application , 1987 .

[2]  Thomas A. Lipo,et al.  A New Approach to Flux and Torque-Sensing in Induction Machines , 1986, IEEE Transactions on Industry Applications.

[3]  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.

[4]  Jeffrey H. Lang,et al.  State observers for variable-reluctance motors , 1990 .

[5]  F. Villata,et al.  Control of high performance interior permanent magnet synchronous drives , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[6]  T.A. Lipo,et al.  A simple and robust adaptive controller for detuning correction in field oriented induction machines , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[7]  T.A. Lipo,et al.  Modelling of saturated AC machines including air gap flux harmonic components , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[8]  R.D. Lorenz,et al.  High resolution velocity estimation for all digital, AC servo drives , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[9]  R.E. Betz,et al.  Control of synchronous reluctance machines , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[10]  Thomas A. Lipo,et al.  Direct field orientation controller using the stator phase voltage third harmonic , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[11]  T.A. Lipo,et al.  A new method for rotor time constant tuning in indirect field oriented control , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.