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.
Highlights
Permanent magnet linear machine (PMLM), which has the advantages of the high thrust density, high positioning accuracy, high response speed, low noise, low maintenance, and simple structure, is widely used in direct drive systems [1,2,3,4,5,6]
According to different mounting positions of permanent magnets (PM), the PMLM can be divided into the primary PM type and the secondary PM type
For the secondary PM type, the PMs have a disadvantage of heat dissipation due to the presence of induced eddy current
Summary
Permanent magnet linear machine (PMLM), which has the advantages of the high thrust density, high positioning accuracy, high response speed, low noise, low maintenance, and simple structure, is widely used in direct drive systems [1,2,3,4,5,6]. According to different mounting positions of permanent magnets (PM), the PMLM can be divided into the primary PM type and the secondary PM type. The machine used in the long stroke drive systems has a problem of high cost, engineering applications and popularization are limited [7]. For the primary PM type PMLM, armature winding and PMs are both located in the primary, and the secondary is only composed of magnetic iron cores. The above shortages can be overcame [8,9,10]
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