Design and Electromagnetic Performance Analysis of Linear Hybrid Excited Flux Switching Machine for Long Stroke Applications

Abstract

In this paper, a linear hybrid excited flux switching machine (LHEFSM) with the iron bridge in the mover core is proposed. The iron bridge between the permanent magnet (PM) and field excitation coil (FEC) avoids the leakage of flux through mover, hence the magnetic flux goes through the bridge and converts the leakage flux into flux linkage. This will increase the magnetic flux and hence the thrust force. The proposed machine has all the excitation sources housed on the mover and the secondary is completely robust, which makes it a good applicant for long stroke applications. Further, the proposed machine uses ferrite magnets in place of the expensive rare-earth PMs which reduces the overall cost of the machine. FECs are used which improves the flux linkage and hence the proposed machine offers enhanced flux regulation capability at different field currents. Parametric optimization is used to optimize the design parameters. Finally, the proposed machine is compared with a conventional machine, 18.97% higher average thrust force $(TF_{avg})$ was achieved under the same volume of PM and the whole machine.