Modeling and Static Analysis of Primary Consequent-Pole Tubular Transverse-Flux Flux-Reversal Linear Machine

Abstract

Abstract:A novel primary consequent-pole tubular transverse-flux flux-reversal linear machine (TTFFRLM) is proposed in this paper. The permanent magnets (PMs) of the machine are located on the inner surface of the short teeth of the primary iron cores for reducing the amount of PM in long stroke drive systems, and the primary is easily manufactured. The structure and principle of this machine are analyzed in detail. Based on the unit machine, a no-load equivalent magnetic circuit model is established by using the magnetic circuit method. Then, the equations of the no-load back electromotive force (back-EMF) and the electromagnetic thrust force are deduced. The simulation models of the unit machine are established by equivalent 2D finite element method (FEM) for saving computation time, and the static characteristics, including the flux field, the no-load back-EMF, and the electromagnetic thrust force, are analyzed. Detailed simulation and experimental results of a three-phase 4-poles 12-slots machine are given. The results verify the correctness and effectiveness of topology, model, and analysis method of the proposed TTFFRLM. Compared with the conventional TTFFRLM, the proposed prototype has the advantages of a lower cost and smaller electromagnetic thrust force ripple.

Linear Machines for Long Stroke Applications—A Review

“…The authors also mention that due to the partitioned-primary structure, the PM immunity is also improved, as the flux from the primary coils is not directly applied to the magnets. Transverse-flux LFRPMs are also proposed in the literature in order to improve the thrust density of these machines [135], [137], [142]- [144]. A comprehensive analysis of a transverse-flux LFRPM is published in [137].…”

“…It is a known issue that transverseflux machines require 3D FEM simulations to analyse their performance. In this aspect, Dong et al [142] propose a 2D FEM equivalent model for the analysis of a transverse-flux LFRPM. The measurements obtained with a prototype show a good agreement between predicted and measured values.…”

“…Consequent-pole machines (Fig. 14 (b)) are capable of improving the thrust density of LPMSMs [129], [142], [157], [161], [162]. This is achieved because, due to their structure the flux leakage is reduced [157], [161], [162], [174].…”

A Review of Transverse Flux Machines Topologies and Design

“…TFMs, together with Vernier, flux-switching and flux-reversal machines can be seen as "flux-modulation reluctance electric machines" [2] or "magnetically-geared machines" with a "single mechanic port" [3]. Furthermore, it is possible to combine some features of different machines: for example, a Vernier TFM is proposed in [4], flux-switching TFMs are presented in [5][6][7][8][9][10] and fluxreversal TFMs are proposed in [11][12][13] .…”

Computationally Efficient Method of Co-Energy Calculation for Transverse Flux Machine Based on Poisson Equation in 2D

“…The references include papers that present different approaches to decreasing computational complexity of the numerical aided design process of the machines with permanent magnets [15,16]. in references [17][18][19][20][21]. The results of the analyses done with the two-dimensional Finite Element Method (FEM 2D) for the TFM type machines were presented and discussed.…”