Nonlinear Performance Characteristics of Flux-Switching PM Motors

Abstract

Nonlinear performance characteristics of 3-phase �ux-switching permanent magnet motors (FSPM) are overviewed. ese machines show advantages of a robust rotor structure and a high energy density. Research on the FSPM is predominated by topics such as modeling and machine comparison, with little emphasis given on its performance and limits. Performance characteristics include phase �ux linkage, phase tor�ue, and phase inductance. In the paper, this analysis is done by a crosscorrelation of rotor position and armature current. Due to the high amount of processed data, which cannot be handled analytically within an acceptable time period, a multistatic 2D �nite element model (FEM) is used. For generalization, the most commonly discussed FSPM topology, 12/10 FSPM, is chosen. Limitations on the motor performance due to the saturation are discussed on each characteristic. Additionally, a focused overview is given on energy conversion loops and dq-axes identi�cation for the FSPM.

Finite Element Analysis of Flux-Switching PM Machine Considering Oversaturation and Irreversible Demagnetization

“…3 shows the back-EMFs waveforms calculated with the B-H curves got with combination of (1) and (2), showing a small difference even when different n is used. When n =3, the calculated back-EMFs with (2) and that without (2) are also close. But it can be seen from Fig.2 (b) that the M-H curve will decrease at high magnetic field when n =3 and the B-H curve is extrapolated without (2), which is clearly unreasonable.…”

“…2 (a). It can be seen that the 3 rd order polynomial with (2) gives the most reasonable extrapolation curve because it has the smoothest transition with (2). When the 4 th order polynomial is used, there is no intersection between (1) and (2).…”

“…B=u 0 H+2.03 (2) Reasonable B-H curve is deduced with the combination of (1) and (2). In calculation, n is first assumed and (1) and (2) iteratively gets the intersection point.…”

“…INTRODUCTION LUX-switching permanent magnet (FSPM) machine has the merits of robust rotor structure and high power density [1][2]. However, the local flux density in stator and rotor teeth may reach 2.5T or even higher [3], making the accurate analysis of the magnetic characteristics a great challenge.…”