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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
This paper addresses the sensorless speed and position control of induction motors using high frequency injection at zero and low frequencies. A novel algorithm is presented which allows the rejection of saturation and nonlinear inverter effects without the need for an off-line pre-commissioning process. The method is based on a set of synchronous filters to identify the disturbance waveforms, and...
The author discusses the control of an induction motor. The proposed approach is based on decoupling the stator current vector into both colinear and orthogonal components to the rotor flux vector. These components are the scalar and vector products of some parameters and rotor flux vector. The control problem where new parameters are control inputs is considered. The problems of designing the torque,...
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