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Analysis and Control of Short-Circuit Fault in a Fault-Tolerant Permanent Magnet Motor Drive with Redundancy |
Zhu Jingwei, Diao Liang, Ren Baozhu, Shao Pingbo |
Dalian Maritime University Dalian 116026 China |
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Abstract In order to increase the reliability, a three-phase fault-tolerant permanent magnet (FTPM) motor drive with redundancy was proposed. In order to study the effect of winding and switch short-circuit faults on output torque feature of this motor drive, the mathematical models of short-circuit and drag torque were built based on the analysis of the equivalent circuits in two faulty conditions. The conclusion that the switch short-circuit fault in inverters has more negative effect on output torque feature than the winding short-circuit fault was revealed through simulation. Then the realization method to transfer the switch short-circuit fault into winding short-circuit fault was provided. Since the average output torque was reduced and the torque ripple was increased due to the short-circuit fault, an optimal current fault control strategy based on the steady mathematical models was proposed. Both simulation and experimental results validate the effectiveness of the proposed fault control strategy.
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Received: 10 September 2012
Published: 25 March 2014
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