Fault-Tolerant Analysis and Design of AFPMSM With Multi-Disc Type Coreless Open-End Winding

Abstract

This paper 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 detail. In this paper, 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, the 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. INDEX TERMS Axial flux magnet synchronous machine, coreless, fault-tolerance, multi-objective optimization, open-end winding.

A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 1: General Overview Considering Multiple Fault Types

“…Switched reluctance and similar machines are excluded because of their very specific characteristics, as performed in other surveys about multiphase drives [2]. Some other particular machine types found in the existing literature about fault-tolerant multiphase drives are also included here, such as outer-rotor [27,102,117,119,229,250,257,264,361,363], dual-rotor [174,249,272,289,375], axialflux [174,268,289,297,306,347,375], hybrid-excitation (hybrid of IM and PMSM) [94,178], and wound-field synchronous machines (WFSMs) [416].…”

“…Wang et al [268] propose an axial-flux coreless PMSM with single-layer FSCW, fed by independent H-bridges. The machine structure consists of multiple stator and rotor discs alternated along the axial direction.…”

“…A multi-objective optimization procedure is presented as well. It is shown that under turn SC faults the air-gap flux is barely affected, not only due to the FSCW, but also because of the high magnetic resistance associated with the absence of core [268] (at the cost of greater magnet volume for given flux linkage [500]).…”

“…A lot of research has also been performed recently about a nine-phase three-sector PMaSynRM with overlapping windings [97,98,129,167,224,[235][236][237][238][242][243][244][245]270], although this one has only been employed by a single research group in the literature so far. Based on the preceding survey, it can also be pointed out that innovative machine structures and winding layouts are still being designed nowadays for multiphase drives with tolerance to stator SCs with excellent unprecedented features (see, e.g., [209,244,249,267,268,272]).…”

Design Optimization of a Low Speed Small Scale Modular Axial Flux Permanent Magnet Synchronous Generator for Urban Wind Turbine Application

“…Since this type of machine has a small axial length, it can be used in an axially modular structure to reach higher output powers [2][3][4][5][6][7][8]. Numerous studies have been conducted in this area [9][10][11].…”