Observer using low-frequency injection for sensorless induction motor Control-parameter sensitivity analysis
Leppanen, V.-M.; Luomi, J.
Industrial Electronics, IEEE Transactions on
Volume 53, Issue 1, Feb. 2006 Page(s): 216 - 224
Digital Object Identifier   10.1109/TIE.2005.862293
Summary: The zero-frequency vector control of an induction motor without a speed sensor has proven to be a very difficult task. Uncertainty and variation in the electrical parameters of the motor deteriorate the performance of fundamental-wave flux observers as the frequency approaches zero, and observers based on high-frequency signal injection rely on motor-specific phenomena. A new method has recently been proposed, where a low-frequency current signal is injected in the estimated rotor flux direction. If there is an error in the orientation, the signal gives rise to a torque oscillation and affects the back electromotive force (EMF) through the mechanical system. The phenomenon makes it possible to reach sensorless zero-frequency operation. This paper shows that the method is insensitive to the variation of the motor parameters. Experiments confirm the result.

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