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In order to control the speed and/or position of permanent magnet (PM) motors, they require position sensors. Basically, the auto-commutation needs 3 sensors for a 3-phase motor. In micro-motors, as there is no space for the sensors, self-sensing must be used. In any case, suppression of the sensors enhances the overall reliability. The motor becomes a sensor itself and electromagnetic phenomena are...
A method is proposed to estimate the rotor time constant TR of an induction motor without measurements of the rotor speed/position. The method consists of solving for the roots of a polynomial equation in TR whose coefficients depend only on the stator currents, stator voltages, and their derivatives. Experimental results are presented
A new type observer for a motion control system is developed and applied to the self-sensing control of an AC-servo motor by estimating the rotor position with the observer. The proposed observer does not need any dividing operation by using the structure similar to the quasi-sliding mode observer and is suitable for DSP applications. Furthermore, since it uses the projection scheme to estimate the...
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