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This paper presents, a rotor speed and stator resistance estimation under very low speed operating region using parallel rotor speed and stator resistance estimation scheme. This scheme is an extension of rotor flux based model reference adaptive system (MRAS) scheme. In this scheme the rotor speed and parameter variation is estimated using MRAS technique. The estimated speed is incorporated as a...
In an inverter, the number of legs can be increased to any number. So, any number of phase voltages can be generated with proper firing pulses. In this work, a five phase machine is modeled and simulated in MATLAB / Simulink. The space vector modulation (SVM) technique is applied to the proposed model for its torque control. The torque control characteristic obtained using SVM based DTC is compared...
In this research study, a new speed control scheme is proposed for direct torque and flux control (DTFC) of induction motor drive (IMD) to replace the conventional constant gain PI-speed controller (PISC). The conventional PISC offers poor dynamic response of stator current, torque and motor speed under sudden change in speed or load torque disturbances. In order to improve the dynamic as well as...
In this paper, a rotor-flux model reference adaptive system (MRAS) based speed sensorless direct torque and flux control (DTFC) of induction motor drive (IMD) using sliding-mode control (SMC) and fuzzy logic control (FLC) based adaptation mechanism schemes are implemented to replace the conventional constant gain PI-controller (PIC). The SMC is considered to minimize the error dynamics under different...
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