Randomized trial analyzes force density and ripple in a novel linear machine, suggesting improvements in design efficiency.
A novel tubular staggered-tooth transverse-flux permanent magnet linear synchronous machine is proposed. The machine is characterized by simple structure and low flux leakage. First, the structure and the operational principle are introduced. Second, the 3-D equivalent magnetic circuit model of the machine is built, and the analytical expression of the electromagnetic force is derived. Last, the force density and the force ripple are optimized with respect to three key dimensional ratios by the 3-D finite-element method. An optimized scheme with the high force density of <tex-math notation="LaTeX">2.697 × 10⁵ </tex-math> N/ <tex-math notation="LaTeX">m³ </tex-math> and the low force ripple of 2.78% is achieved. In addition, the characteristics of the proposed machine are compared with other topologies of linear machines.
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Zheng et al. (2015) studied this question.
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