Abstract
This paper pertains to a technique of a sensorless indirect stator field-oriented induction motor control, which prevents the accumulative errors incurred by the integrator and the problem relating to the stability of the control system caused by the stator resistance susceptible to temperature variations while conducting the flux estimation directly and computing the synchronous rotary speed. The research adds an adaptive flux observer to estimate the speed of the rotor and uses the fixed trace algorithm (FTA) to execute an online estimation of the slip difference, thereby improving the system of stability under the low rotary speed at regenerating mode and the influence of the rotor resistance on the slip angle. Finally, the paper conducts simulations by Simulink of MATLAB and practices to verify the correctness of the result the paper presents.
Highlights
Induction motors are broadly applied to industrial machines due to their simple configuration and easy maintenance
To save the space and maintain and decrease the influence of promiscuous signals of the speed sensor on the reliability and the antinoise capability of the control system of the induction motor, researches on sensorless speed controller have been claimed incessantly [4,5,6,7]. It can be classified into the flux estimation mode and the model reference adaptive mode [4]
The former conducts the estimation by using an open-loop method, so it is susceptible to variations of motor parameters. The latter adopts the structure of the model adaptive mode in order to obtain a preferable system response and accuracy of estimation [1, 8]
Summary
Induction motors are broadly applied to industrial machines due to their simple configuration and easy maintenance. To save the space and maintain and decrease the influence of promiscuous signals of the speed sensor on the reliability and the antinoise capability of the control system of the induction motor, researches on sensorless speed controller have been claimed incessantly [4,5,6,7] It can be classified into the flux estimation mode and the model reference adaptive mode [4]. The former conducts the estimation by using an open-loop method, so it is susceptible to variations of motor parameters The latter adopts the structure of the model adaptive mode in order to obtain a preferable system response and accuracy of estimation [1, 8]. The subject research adopts the rotor observer by the fixed trace algorithm (FTA) to estimate the rotor resistance [2, 9]
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