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Electromagnetic torque can be used to form a model reference adaptive system (MRAS) to achieve online identification of rotor time constant in an induction motor drive. The steady-state torque error caused by rotor time constant error is established in this paper. Based on the steady-state analysis, the converging relationship in the MRAS is found out to be lost for some operating points. Then the...
Depending on the functional candidates, such as rotor flux, stator voltage, electromagnetic torque, and reactive power, various schemes based on a model reference adaptive system (MRAS) have been proposed to update rotor time constant. In this paper, a unified model for rotor time constant identification based on MRAS in an induction motor drive with indirect field-oriented control is developed. It...
An induction motor is the most widely used electric machine in high performance drive applications. This paper presents performance analysis of rotor speed estimation method using model reference adaptive control (MRAC) concept along with online estimation of machine parameters mainly stator resistance information requires especially at low speeds and online tuning of rotor time constant for high...
To improve the performance of a sensorless indirect field oriented control of induction drive a speed estimation method insensitive to machines parameters using model reference adaptive system (MRAS) along with online identification of rotor time constant is proposed. Proposed speed identification method uses reactive power as tuning signal for estimating the speed. In conventional MRAS methods, reference...
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