Power switch open circuit fault diagnosis strategy for novel fault-tolerant electric drive system based on fuzzy logic

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A novel fault-tolerant electric drive system based on dual-winding permanent magnet motor (DWPMM) has been proposed to enhance the reliability of electric drive system. The proposed electric drive system with strong fault-tolerant capability not only possesses the superiority of high reliability, but also can reduce the cost of drive system and adapt to single power supply. Due to temperature mutation, line aging, electromagnetic interference, and low hardware reliability, the intermittent open circuit fault will be caused in power switches by the failure of drive signal. The power switch intermittent open circuit fault is a fault between normal state and complete fault state, which is not a complete open circuit fault and cannot be diagnosed by the conventional fault diagnosis methods. The fuzzy logic means to imitate the way of judgment and reasoning of uncertain concepts in human brain, and reason to overcome the fuzzy information problem which is difficult to solve by regular methods. In this paper, the power switch open circuit fault diagnosis strategy for novel fault-tolerant electric drive system based on fuzzy logic is proposed and investigated. Through theoretical analysis and verification, the research results indicate that the proposed power switch open circuit fault diagnosis strategy based on fuzzy logic can detect and locate the general and intermittent open circuit fault in real time and accurately.