Abstract
This chapter proposes a novel sine with optimal third harmonic injected shaping mover to improve the thrust force and efficiency without deteriorating the thrust ripple in permanent magnet linear synchronous machine (PMLSM). The optimal value of third harmonic injected into the sinusoidal permanent magnet (PM) shape for maximizing thrust force is analytically derived and confirmed by finite element (FE) analysis. Further, to maximize thrust force and efficiency, and minimize thrust triple, the PM edge thickness and pole arc coefficient are optimized by non-linear programing method. It is found that the optimal third harmonic is 1/6 fundamental one, and the optimal PM edge thickness and pole arc coefficient are 0 mm and 0.85, respectively. For the PMLSM with sine and third harmonic (SIN+3rd) shaping mover, sine (SIN) shaping mover and conventional (without shaping) shaping mover, the electromagnetic performances are compared. The results demonstrate that the average thrust force and efficiency of the PMLSM with SIN+3rd shaping mover are improved significantly, while the thrust ripple is not deteriorated, compared with that of the PMSLM with SIN shaping mover.
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