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Description
The surface-mounted permanent magnet linear motor (PMLM) is a good candidate for the application of urban transit due to its merits of high-power density and efficiency. However, this kind of machine needs a lot of permanent magnets (PMs) on the long stator structure, which is costly. To solve this problem, a novel PMLM has been proposed in this paper. The stator of novel PMLM has the consequent poles structure and the mover of novel PMLM has two iron cores, which sandwiches a PM. Firstly, the structure and operation principle of the PMLM have been investigated. Then, the key parameters, including the structure parameters, the back electromotive force, the efficiency, the force ripples are fully analyzed. Finally, for a fair comparison, the proposed motor is designed and built based on an existing PMLM with the similar electromagnetic and geometrical parameters. The performances of the novel PMLM are estimated and compared with the conventional surface-mounted PMLM, which indicates that the proposed PMLM can keep the same performances with the exciting PMLM. Moreover, it has the simple structure and can save about 50% of PMs, which can help reduce costs.
