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Cascade and high-gain observers based on interconnected form to estimate the mechanical and magnetic states of sensorless induction motor drives are considered. Furthermore, a flux and speed sliding-mode controller is proposed and combined with the observers to achieve the tracking of rotor flux and mechanical speed for induction motor without the need of flux, speed and load torque measurements....
Two observers to estimate the mechanical and magnetic states of sensorless induction motor drives are considered in the paper. The methods, based on interconnected form, are compared in terms of their speed tracking capability and their sensitivity to parameter variations on low frequencies benchmark particularly where the motor state is unobservable
The design of two interconnected observers for induction motor drive in sensorless application is adressed in this paper. The first one is dedicated to angular speed and load torque estimation while the second estimates fluxes. Stability of both observers is discussed. Moreover due to the complexity of observation at low frequencies, a part of the contribution of this paper is that the observers are...
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