Affiliations: State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
Correspondence:
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Corresponding author: Bo Zhang, State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Tel.: +86 21 34206547; Fax: +86 21 34206547; E-mail:b_zhang@sjtu.edu.cn
Abstract: In this paper, an arc-edged trapezoidal Halbach PM linear
actuator for precision engineering is proposed. In this linear actuator, the
Halbach PM array is utilized as a mover. To take into account the magnetic
field distortion caused by the finite-length of the PM array near the
boundaries, a long-period Fourier series expansion is applied to calculate
the field distribution of the PM array and the associated thrust. They are
then validated by the finite element method and physical experiments.
Finally, by a fitting-based local searching method, design optimization is
implemented to achieve a small thrust ripple as well as a large mean thrust.
Keywords: Halbach array, arc-edged trapezoidal PM, linear PM actuator, fourier series expansion, design optimization
