This paper aims to demonstrate the three dimensions (3-D) harmonic function characteristics and modulation theory of the magnetic lead screw (MLS) transmission. The MLS enables the conversion of rotational motion into linear motion and vice versa by helical magnetic fields, thereby significantly suitable for linear motions. Due to its helical structure, the magnetic field of the MLS exhibits a 3-D distribution with both axial and circumferential components, respectively. Therefore, a novel helical detection method is proposed to analyze the 3-D magnetic field intuitively. Moreover, as the conversion capability is a key part of the MLS, the harmonic function and modulation mechanism for variable modulation MLSs are analyzed. Furthermore, a new concept of multi-harmonic MLS is proposed, and the effects of 3-D modulation and harmonics coordination characteristics are analyzed. Finally, the prototypes of different MLS topologies are manufactured and tested. The feasibility of using the 3-D magnetic transmission technology is validated by experimental results.
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Ling et al. (2024) studied this question.
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