Innovation of Flux Switching Machine: Design Variation Review

Abstract

Flux Switching Machine (FSM) have been gaining interest over the last few decades due to their numerous advantages such as high torque density, high-speed capability, ease of control, low vibration and low acoustic noise compared to conventional competing machines. In addition, the structure itself provides favourable thermal management due to the location of PMs on the stator as well as the passive and hence robust rotor structure which is suitable for high-speed applications. However, it has been discovered that this machine tends to generate significant cogging torque, exhibit high leakage current, and possess a complex design for flux weakening capability. Numerous research efforts are dedicated to addressing these limitations, but there is a lack of comprehensive reviews specifically focused on the design variations of this type of machines. This paper attempts to review the latest design variation in conventional Permanent Magnet Flux Switching Machine (PMFSM), Field Excitation Flux Switching Machine (FEFSM) as well as Hybrid Excitation Flux Switching Machine (HEFSM), which is the combination of both permanent magnet and field excitation. The review includes various stator structure, rotor structure and special structure with different approach to reduce drawback in conventional FSM. The motivation of this review is to identify the potential research areas and gaps that the FSM could be more focused on, especially for industrial applications as well as transportation. Besides, design possibility in employing several structures to another structure to increase performances of the FSM is also emphasized. In conclusion, based on the literature review, is focusing on approximately 71% of PMFSM while FEFSM and HEFSM of 14% each.

Keywords

• Electromagnetics
• Flux switching machine
• Permanent magnet
• Field excitation
• Finite element

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