Magnetic Field Modulation Mechanism and Speed Regulation Performance of Permanent Magnet Adjustable-speed Drivers

doi:10.3901/JME.260242

Abstract

Abstract: The magnetic field modulated permanent magnet adjustable-speed driver (MFM-PMASD) is a novel dual-rotor magnetic transmission system that combines the topological configurations of permanent magnet synchronous machines and magnetic gears. It enables wide-range continuously variable speed regulation through frequency conversion control. In this study, the MFM-PMASD is designed, and the physical mechanism of magnetic field modulation is analytically derived, establishing the relationships among the pole-pair numbers and rotational speeds of the stator winding, modulator ring rotor, and permanent magnet rotor. Analytical solutions for the air-gap flux density and the torque of the inner/outer rotors are obtained using the equivalent magnetic circuit method. Finite element simulations in ANSYS Maxwell are employed to analyze the air-gap flux density distribution, harmonic components, and speed regulation characteristics under various operating conditions. Four critical structural parameters affecting torque transmission performance are investigated. Simulation results demonstrate that selecting permanent magnet rotors and stator windings with opposite parity in pole numbers significantly reduces torque ripple. To achieve high torque output with minimal torque pulsation, the optimal pole arc coefficient of the permanent magnets is determined to be 0.75-0.8. Furthermore, the torque transmission performance is optimized when the width ratio of the modulator’s permeable segments is 0.5 and the ratio of permanent magnet thickness to physical air gap is 2. A prototype is manufactured, and experimental results validate the accuracy of the theoretical model while confirming the advantages of the MFM-PMASD in wide speed regulation range and high control precision. This work provides theoretical guidance for optimizing the design of MFM-PMASDs and achieving precise speed regulation under variable load conditions.

Key words: magnetic transmission system, magnetic field modulation, permanent magnet adjustable-speed driver, speed regulation performance

CLC Number:

TH113

ZHANG Chunlin, XIAO Yunlü, QIN Yi, LUO Jun, YUAN Shujin, HAO Yaodong, WU Fei. Magnetic Field Modulation Mechanism and Speed Regulation Performance of Permanent Magnet Adjustable-speed Drivers[J]. Journal of Mechanical Engineering, 2026, 62(5): 253-262.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260242

http://www.cjmenet.com.cn/EN/Y2026/V62/I5/253

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