Abstract
This article presents a multi-disc coreless axial flux permanent magnet synchronous machine (MDC-AFPMSM) with N pole and S pole type series magnetic circuit and open-end winding for high reliability applications, such as small power actuator system. Firstly, the topology and driving modes of MDC-AFPMSM are presented in details. In this article, a multi-objective optimization function is proposed to design the machine with full consideration of various influence factors. The drive performance indexes of four-phase, five-phase and six-phase machines are analyzed and discussed. Furthermore, main parameters of the five-phase MDC-AFPMSM with open-end winding are calculated. In order to reduce the torque ripple, the air gap magnetic flux is optimized. Finally, the operation characteristics under short-circuit and open-circuit faults are fully analyzed based on the three-dimensional (3D) finite element algorithm. Comprehensive simulation results and theoretical analysis have demonstrated that the open-end winding MDC-AFPMSM has much stronger fault-tolerant ability in comparison to that of conventional machines.
Highlights
Electric actuator replaced traditional hydraulic mechanism in the intelligent equipment and its use has been considerably increased during the last decades
This article proposes a fault-tolerant open-end winding MDC-axial flux permanent magnet synchronous machine (AFPMSM) topology for the actuator, which is constrained by the structure, accuracy, reliability and cost
In this article, a multi-disc coreless axial flux permanent magnet synchronous machine (MDC-AFPMSM) with N pole and S pole type series magnetic circuit and openend winding is proposed for high reliability applications
Summary
Electric actuator replaced traditional hydraulic mechanism in the intelligent equipment and its use has been considerably increased during the last decades. X. Wang et al.: Fault-Tolerant Analysis and Design of AFPMSM With Multi-Disc Type Coreless Open-End Winding working states. In [7], authors presented one machine, in which each phase winding is excited by H-bridge power supply, separately This topology can get the electrical isolation between different windings effectively. The openend winding machine system can be modulated by two-level inverters at both ends of the stator windings to produce threelevel effect, which can further improve the machine drive performance and make the control strategy more flexible [9]. This article proposes a fault-tolerant open-end winding MDC-AFPMSM topology for the actuator, which is constrained by the structure, accuracy, reliability and cost. A multi-objective optimization function considered the performance, fault tolerance, processing cost, and drive system complexity is proposed It can determine the phase number of MDC-AFPMSM. Comprehensive simulation results based on 3D finite element algorithm and related analytical discussions are presented to study the drive performance and fault-tolerant ability of the MDC-AFPMSM
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