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Using backstepping, which is a recursive nonlinear design method, a novel approach to control of induction motors is developed. The resulting scheme leads to a nonlinear controller for the torque and the amplitude of the field. A combination of nonlinear damping and observer back-stepping with a simple flux observer is used in the design. Assuming known motor parameters the design achieves stability...
This paper addresses the subject of interturn short circuit estimation in the stator of a delta-connected induction motor. In this paper, an adaptive observer scheme is proposed. The proposed observer is capable of simultaneously estimating the speed of the motor, the amount turns involved in the short circuit, and an expression of the current in the short circuit. Moreover, the states of the motor...
This paper addresses the subject of inter-turn short circuit estimation in the stator of a delta-connected induction motor. In the paper an adaptive observer scheme is proposed. The proposed observer is capable of simultaneously estimating the speed of the motor, the amount turns involved in the short circuit and an expression of the current in the short circuit. Moreover the states of the motor are...
The paper presents a position sensing method for IPM motors based on an observer referring to the estimated frame of reference, eliminating problems with position dependent inductances. Convergence of the estimation error to zero is proofed, under the assumption that the mechanical time constant is much larger than the electrical one. The observer can be used right from startup to rated speed, so...
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