Electromagnetic Performance Analysis of Linear Hybrid Excited Flux Switching Machine with Ferrite Magnets

Due to its high thrust density, low cost and high reliability, the Hybrid Excited Linear Flux Switching Machine (HELFSM) are among the most recent candidates for long-stroke applications. Permanent magnet flux switching machines (PMFSM) use rare earth magnets, such as neodymium, which are inherently expensive and obsolete. HELFSM is proposed by reducing the volume of the permanent interest (PM) of the traditional linear PMFSM and instituting a set of field windings in the space saved. The effects of various significant design parameters, like split ratio, AC winding slot area, DC lower winding slot area, DC upper winding slot area, secondary tip width, and pole height, are investigated using finite element analysis to maximise thrust density and reduce thrust ripple under load conditions. Under the same volume constraints and electrical load, the proposed model can achieve higher maximum thrust than the optimized traditional model with magnets located at the bottom.

I. Introduction

Due to the need for a complex gear system to convert rotational torque into linear thrust, the rotating machinery used for translational motion is low in efficiency and high in cost. Linear motors (LM) can produce direct linear thrust. Due to the reduced mechanical conversion system, it is reliable, has a fast dynamic response, and has excellent overload capacity. The Linear Flux Switching Machine (LFSM) combines the characteristics of LPMSM and LSRM with the following advantages: High power density [1], bipolar flux linkage, rugged secondary (stator) construction, suitable for rugged and fast applications [2], reduced manufacturing costs [3], and for extreme environmental conditions, it has improved temperature control [4].