Abstract
A novel doubly-fed flux reversal linear machine (DF-FRLM) is proposed in this paper, which has two sets of armature windings wound on stator and mover teeth, respectively. The proposed DF-FRLM can exhibit significantly higher thrust force than the conventional FRLM by fully utilizing the stator slot space. The configuration and operation principle of a 6/5 mover/stator-pole DF-FRLM are described. In order to obtain maximum thrust force, the major design parameters of both conventional FRLM and proposed DF-FRLM are optimized by 2D finite element (FE) method. The optimized DF-FRLM and FRLM are investigated and compared in terms of the electromagnetic performance. It is found that the average thrust force of the optimized DF-FRLM is 1.23 times that of the optimized FRLM. In addition, the optimized DF-FRLM can achieve 34.4% higher average thrust force compared to the conventional FRLM whose geometry parameters are the same as that of the optimized DF-FRLM. Furthermore, a periodic model of the DF-FRLM is used to analyze the influence of the longitudinal end effect on the machine electromagnetic performance. Finally, experimentation is carried out to verify the 2D FE simulation result.
Highlights
Permanent magnet linear machines (PMLMs) have been widely used in various applications including industrial robots, domestic appliances, long distance transportation systems due to their high power density, high thrust force density, better precision, less maintenance, etc. [1]–[6]
The analysis shows that compared to the conventional Flux reversal linear machines (FRLMs), the proposed machine reduces flux leakage
MACHINE CONFIGURATION Fig. 1 (a) shows the topology of the conventional FRLM, in which the stator is three times the length of the mover. Another set of armature winding is placed in the stator slots and the proposed 6/5-pole doubly-fed flux reversal linear machine (DF-FRLM) is obtained, which is shown in Fig. 1 (b)
Summary
Permanent magnet linear machines (PMLMs) have been widely used in various applications including industrial robots, domestic appliances, long distance transportation systems due to their high power density, high thrust force density, better precision, less maintenance, etc. [1]–[6]. In order to further improve the thrust force without increasing the difficulties of machine manufacturing significantly, another set of armature windings wound on stator teeth can be introduced to the existent structures of FRLMs. Based on the conventional FRLM structure, a novel doubly-fed (DF) FRLM (DF-FRLM) with two sets of armature windings wound on both stator and mover teeth is proposed. MACHINE CONFIGURATION Fig. 1 (a) shows the topology of the conventional FRLM, in which the stator is three times the length of the mover On this basis, another set of armature winding is placed in the stator slots and the proposed 6/5-pole DF-FRLM is obtained, which is shown in Fig. 1 (b). The three machines are compared and investigated in terms of the electromagnetic performance
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