Speed estimation and sensorless control of AC drives

The operation of speed controlled AC drives without mechanical speed or position sensors requires the estimation of internal state variables of the machine. The assessment is based exclusively on measured terminal voltages and currents. Low cost, medium performance sensorless drives can be designed using simple algebraic speed estimators. High-performance systems rely on dynamic models for the estimation of the magnitude and spatial orientation of magnetic flux waves in the stator or in the rotor. Open loop and closed loop observers differ with respect to accuracy, robustness, and limits of applicability. The overview in this paper uses signal flow graphs of complex space vector quantities to give an description of the physical and mathematical systems used in sensorless control.<<ETX>>

[1]  C. Schauder,et al.  Adaptive speed identification for vector control of induction motors without rotational transducers , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[2]  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.

[3]  T. Ohtani,et al.  Vector control of induction motor without shaft encoder , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[4]  Robert Joetten,et al.  Control Methods for Good Dynamic Performance Induction Motor Drives Based on Current and Voltage as Measured Quantities , 1983, IEEE Transactions on Industry Applications.

[5]  Thomas A. Lipo,et al.  A direct field oriented controller for induction motor drives using tapped stator windings , 1988 .

[6]  Shinji Doki,et al.  Adaptive sliding observers for direct field-oriented control of induction motor , 1990, [Proceedings] IECON '90: 16th Annual Conference of IEEE Industrial Electronics Society.

[7]  X. Xu,et al.  A stator flux oriented induction machine drive , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.

[8]  Joachim Holtz,et al.  Vector-controlled induction motor drive with a self-commissioning scheme , 1991 .

[9]  H. Tajima,et al.  Speed sensorless field orientation control of the induction machine , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.