Analysis of a Discrete Stator Hybrid Excited Flux Switching Linear Machine

Basharat Ullah,Faisal Khan,Ahmad H Milyani

doi:10.1109/access.2022.3143794

Abstract

A discrete stator hybrid excited flux switching linear machine (DSHEFSLM) is proposed in this paper. The proposed DSHEFSLM uses a discrete stator to reduce the iron loss and overall cost of the machine. Assistant teeth are used at both ends of the mover to overcome the unbalance in the three phases, which is a global issue in linear machines. Field excitation (FE) is used, which adds field regulation capability to the proposed machine and makes it suitable for a wide speed operation range. A magnetic equivalent circuit model is used to find the suitable coil combination and no-load flux linkage. The multiobjective genetic global optimization is used to optimize the design parameters of the whole machine while keeping the slot area, electric and magnetic loadings constant. A correlation table is drawn to show the impact of different design parameters on average thrust force. The optimization has increased the peak-to-peak flux linkage by 11%, average thrust force by 34.60%, thrust force density by 34.60%, decreased thrust force ripples, and detent force by 21.05% and 8.58% respectively. The proposed machine has reduced the volume of the permanent magnet by 39.18% and offers 28.09% higher average thrust force and thrust force density compared to the flux switching permanent magnet machine proposed in the literature.

Highlights

Linear machines are in high demand in various applications, ranging from domestic applications to industrialization
PM flux switching linear (PMFSL) machine combines the characteristics of permanent magnet (PM) synchronous linear machines (PMSLM) and switched reluctance linear machines (SRLM)
This paper proposes a series hybridized discrete stator hybrid excited flux switching linear machine (DSHEFSLM), which is based on the PMFSL machine proposed in [26]

Summary

INTRODUCTION

Linear machines are in high demand in various applications, ranging from domestic applications to industrialization. In [25], a slot PM machine is proposed with concentrated field and armature winding low copper losses and good efficiency, but it has problems of magnetic saturation, flux leakage, and rare earth magnets are used in substantial volume Another HEFSL machine is proposed in [17] in which the PM is sandwiched between two DC excitation sources and is converted into dual mover topology in [19]. The working principle of the proposed design is based on a no-load flux linkage obtained by a magnetic equivalent model (MEM) and verified by 2D FEA. MAGNETIC EQUIVALENT MODEL To reduce the computational complexity and drive storage, MEM is used to find initial performance and suitable coil combinations for the proposed design.

GENETIC OPTIMIZATION

LOAD ANALYSIS

Findings

CONCLUSION