<p>This paper presents the design, analysis, and experimental validation of a novel cylindrical linear permanent magnet Vernier hybrid machine with limited motion (CLPMVHMLM). Unlike conventional flat Vernier machines, which often suffer from asymmetric flux distribution, bulky translators, and sealing difficulties, the proposed configuration employs a vertical hollow translator enclosed by a cylindrical stator. Two stator core variants are investigated: an integrated core design and a segmented, non-integrated design. Finite element analysis (FEA) and prototype testing demonstrate that the non-integrated topology effectively suppresses unwanted rotational flux components while concentrating flux in the linear direction. Consequently, it achieves a 45.24% increase in thrust force (120.81 N vs. 83.18 N) and a 27.26% increase in back-EMF (18.11 V vs. 14.23 V) compared with the integrated version, while simultaneously reducing RMS current from 2.89 A to 1.74 A. Experimental validation shows close agreement with simulation predictions, thereby confirming both the accuracy of the analytical models and the practical feasibility of the design. The combination of cylindrical symmetry, hollow translator capability, and stator non-integrated provides distinct advantages for compact, high-force, and reliable limited motion applications. These features suggest the CLPMVHMLM as a potential alternative to conventional linear Vernier topologies, with promising potential for wave energy conversion, microparticle separation, and precision actuation systems.</p>

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A cylindrical linear permanent magnet hybrid machine for vertical hollow translator

  • Mohammad Reza Mohammadzadeh Moghaddam Rafi,
  • Hamid Yaghobi

摘要

This paper presents the design, analysis, and experimental validation of a novel cylindrical linear permanent magnet Vernier hybrid machine with limited motion (CLPMVHMLM). Unlike conventional flat Vernier machines, which often suffer from asymmetric flux distribution, bulky translators, and sealing difficulties, the proposed configuration employs a vertical hollow translator enclosed by a cylindrical stator. Two stator core variants are investigated: an integrated core design and a segmented, non-integrated design. Finite element analysis (FEA) and prototype testing demonstrate that the non-integrated topology effectively suppresses unwanted rotational flux components while concentrating flux in the linear direction. Consequently, it achieves a 45.24% increase in thrust force (120.81 N vs. 83.18 N) and a 27.26% increase in back-EMF (18.11 V vs. 14.23 V) compared with the integrated version, while simultaneously reducing RMS current from 2.89 A to 1.74 A. Experimental validation shows close agreement with simulation predictions, thereby confirming both the accuracy of the analytical models and the practical feasibility of the design. The combination of cylindrical symmetry, hollow translator capability, and stator non-integrated provides distinct advantages for compact, high-force, and reliable limited motion applications. These features suggest the CLPMVHMLM as a potential alternative to conventional linear Vernier topologies, with promising potential for wave energy conversion, microparticle separation, and precision actuation systems.