In this paper, a short-circuit fault-tolerant operation control strategy of dual-winding permanent-magnet motor (DWPMM) under the four-quadrant condition for electrical flight surface actuator application is proposed and investigated. By the comparative analysis of the current fault-tolerant permanent-magnet motor drive system, it can be concluded that the DWPMM drive system is suitable for electrical flight surface actuator application. However, the current DWPMM drive system lacks the research on short-circuit fault-tolerant operation under the four-quadrant condition. Then, the electrical flight surface actuator system based on the DWPMM and short-circuit fault-tolerant operation control strategy under the four-quadrant condition is proposed and investigated. The experimental results show that the electrical flight surface actuator system based on the DWPMM can achieve the high performance of the four-quadrant fault-tolerant control with short-circuit fault under the four-quadrant operational condition.

In order to adapt to the single power supply system of the aircraft, this paper proposes and investigates a novel dual-winding fault-tolerant (DF) motor drive system based on the redundancy bridge arm for aerospace applications. The proposed DF motor offers the advantages of magnetic isolation, physics isolation, thermal isolation, small cogging torque ripple, inhibiting the short circuit current and high fault tolerance. The proposed DF motor drive can adapt to the single power supply system of the aircraft, reduce the drive cost, and reduce the number of independent power sources and power switches. In addition, it can improve power density, the reliability and the utilization rate of the drive. At the same time, the drive system has stronger fault-tolerant ability and it can achieve the fault tolerant control for one phase winding fault or multiphase windings fault. To realize the short-circuit fault diagnosis performance, the short-circuit fault diagnosis and processing method has been investigated. Then, to realize the fault-tolerant performance, a novel SVPWM fault-tolerant control strategy is proposed. Finally, the DF motor drive performances have been verified by experiments. The research results verify the reliability and effectiveness of the proposed DF motor drive system and SVPWM fault-tolerant control strategy.

A novel 24/17-pole 3-phase stator wound field flux switching (SWFFS) machine with the combination of overlapping armature winding (OAW) and asymmetric stator poles (ASP) is proposed for higher torque density in this article. First, the air-gap modulation principle of the 24/17-pole OAW-SWFFS machine is analyzed to better understand its torque production mechanism. Second, since the torque capacity will be greatly restricted by the serious magnetic saturation which is introduced by the OAW configuration, two effective measures are proposed from two perspectives in this article to solve this problem. The first measure is to reduce the magnetic saturation directly by optimizing the area ratio of armature slot and excitation slot, and thus, the torque density can be improved effectively. The second measure is to further enhance the open circuit flux linkages, back electromotive force (EMF), and thus, the torque density by adopting the proposed ASP structure. Furthermore, the accurate ASP distances which are corresponding to the largest back EMF can be obtained effectively based on the air-gap field modulation theory. Finally, the proposed design is validated experimentally by a prototype machine. The simulated and experimental results show that about 25.7% higher torque density can be obtained when compared with 24/14-pole SWFFS machine.

To diagnose different types of open-circuit (OC) faults in novel dual-winding fault-tolerant permanent magnet motor (DFPMM) drive, a fault diagnosis strategy based on fuzzy logic is proposed and investigated. The proposed DFPMM drive requires less independent power supply and power switches, its reliability, utilization, and power density are improved compared with some existing multiphase fault-tolerant drives. To locate power switch intermittent OC fault that is difficult to be diagnosed by traditional strategies, the fuzzy logic theory is used in the proposed strategy, the membership functions and fuzzy rules in the proposed fuzzy logic system are specially designed and optimized to meet the requirements of fault diagnosis. The proposed fault diagnosis strategy has strong robustness, due to the optimized dynamic average calculation cycle and normalization, its diagnosis results are not affected by speed or load mutation; Additionally, an error-proof processor is added to the system as a part of the proposed strategy, which prevents misdiagnosis by improving the shape of phase current waveform when DFPMM operates at no-load or light-load state. The proposed strategy can quickly and accurately locate winding OC, power switch OC, and power switch intermittent OC faults in DFPMM drive, furthermore, it can quantify the fault level of intermittent OC fault for staff to take different remedial measures according to different situations. Simulation and experimental results verify the correctness and efficiency of the proposed strategy.

To adapt to the single power supply system of the aircraft, this study proposes and investigates a novel fault‐tolerant drive system based on the redundancy bridge arm for aerospace applications. The proposed fault‐tolerant drive system adopts a dual‐winding fault‐tolerant (DF) motor; the DF motor offers the advantages of magnetic isolation, physical isolation, thermal isolation, small cogging torque ripple, inhibiting the short‐circuit current and high fault tolerance. The proposed fault‐tolerant drive can adapt to the single power supply system of the aircraft, reduce the drive cost, and cut down the number of independent power sources and power switches. In addition, it can improve the power density, reliability, and the utilisation rate of the drive system. To realise the open‐circuit fault diagnosis performance, the diagnosis and processing method of the open‐circuit fault has been investigated. Then, to realise the fault‐tolerant performance, a novel space‐vector pulse‐width modulation (SVPWM) fault‐tolerant control strategy is proposed. Finally, the performances of the fault‐tolerant drive have been verified by simulations and experiments. The research results verify the reliability and effectiveness of the proposed fault‐tolerant drive system based on the redundancy bridge arm and SVPWM fault‐tolerant control strategy.

High-performance and reliable electric drive systems are playing an increasingly important role in improving the reliability and operational performance of electric gun control systems and adapting to complex and ever-changing battlefield environments. In order to improve the reliability of electric gun control system, this article proposes a common bus dual-inverter drive system of dual-winding fault-tolerant permanent magnet motor (DFPMM), which achieves fault-tolerant control in the event of single or multiple windings open-circuit faults and improves the system's fault-tolerant ability. In addition, this article analyzes and designs the control strategy based on the two working modes of fast-tracking target and stable following target in the gun control system, and proposes a dual-mode control strategy based on the DFPMM driving system. Through simulation and experiments, it has been verified that the proposed DFPMM drive system achieves fault-tolerant operation in the presence of windings open-circuit faults, thus forming a highly reliable and fault-tolerant system. The proposed dual-mode control strategy aims to reduce the time required to aim at the target, improve the stability of the gun barrel during tank operation, and thereby improve the operational performance of the electric gun control system.