Linear machines with high thrust force and low thrust ripple are essential for linear direct-drive applications. The transverse flux machines gain the advantage of high force density by decoupling of electric and magnetic loadings. However, there exists high thrust ripple defecting its performance. This paper investigates thrust ripple of a dual-PM transverse flux linear machine (TFLM) with permanent magnets on both primary and secondary sides. The causes resulting in the thrust ripple is presented and analyzed, including the detent force, the reluctance force and the harmonic force. The 3-D finite element method is employed to evaluate the electromagnetic performance. Furthermore, the suppression technologies of both pole shifting and skewing of secondary side are estimated to reduce the thrust ripple of the dual-PM TFLM.
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