Design, modelling and fault analysis of induction motor drive system using ANSYS
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Date
2018-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Induction motors have wide applications in industries by virtue of its reliability, efficiency, robustness, self-starting capability and low cost. With rapid developments in power electronics over the past few years, the 3-ɸ induction motor has acquired a unique place in the variable speed application drives. The PWM-VSI fed 3-ɸ induction motor drives have pioneered in industrial applications for variable speed operations such as traction, robotics, aeronautics and railway. The fast switching, high efficiency, simple gate signal commutations control and ability to manage high short-circuit current of power switches like IGBT have created wide applications of VSIs for the drives. However, these IM drives are prone to different types of faults like IGBT switch short-circuit and open circuit fault. On an approx. nearly 53% failures occur in the control circuit while 38% failures are majorly associated with the power components of variable speed drives. Thus, it becomes crucial to investigate the complete design, modelling and fault analysis of the IM drive system. This thesis presents a comprehensive performance analysis of PWM-VSI fed IM drive system under normal and fault operation. This work is an attempt to encompass various aspects of design, modelling, simulation and analysis of the IM drive circuit. Typical cases of IGBT open-circuit and short-circuit faults have been analysed in the proposed work. The 7.5 kW prototype of SCIM has been designed in RMxprt and Maxwell 2D design tools for finite element analysis. While the SPWM controlled inverter circuit has been designed in the Simplorer design tool. The Maxwell 2D motor model and Simplorer circuit design are then co-simulated in order to investigate the performance of the open-loop drive system and analysis of the open-circuit and short-circuit faults in inverter IGBT.
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