volume | PIER Journals

Abstract

A hybrid excitation linear machine with all excitations on the primary has the advantage of low cost in long-stroke applications and flexible flux regulation. The permanent magnet and field winding concurrently contribute to the effective thrust force, that is, the permanent magnet excitation thrust force and electrical excitation thrust force. However, the insufficient utilization of the two magnetic fields limits the thrust force enhancement. To enhance the thrust force, this study proposes a flux-modulated hybrid excitation linear machine with improved concurrent utilization of air-gap magnetic fields from permanent magnets and field windings. First, the topology and operating principle of the machine are interpreted. An analytical model was built to analyze the air-gap magnetic field harmonics and flux linkage from the permanent magnet and field winding. In addition, the electromagnetic performance, including the flux regulation capability and thrust force, was investigated using finite element analysis. It was found that its average thrust force and flux regulation capability were significantly improved compared with the counterpart.

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Dr. Liang Xu

Dr. Lei Zhao

Dr. Tingting Jiang