Open AccessDesign of linear voice coil motor with semi‐closed structure
Author(s) -
Luo Ciyong,
Lin Zhonglan,
Sun Jun
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2019.0241
Subject(s) - yoke (aeronautics) , magnet , air gap (plumbing) , thrust , electromagnetic coil , magnetic circuit , topology (electrical circuits) , halbach array , magnetic reluctance , magnetic flux , magnetic field , mechanical engineering , finite element method , flux linkage , torque density , electrical engineering , engineering , physics , materials science , induction motor , structural engineering , direct torque control , quantum mechanics , composite material , control system , voltage , fly by wire
A Halbach permanent magnet (PM) tubular linear voice coil motor (LVCM) with a semi‐closed structure is developed to enhance the thrust density in this study. Generally, the end of conventional LVCM is open and suffers from the considerable end reluctance. The usage of Halbach array in LVCM makes this problem more prominent although it improves the air‐gap flux density greatly. The flux at the end of LVCM can be guided to improve the air‐gap flux density. Therefore, this study aims to constrain and direct the magnetic field at the end of a Halbach PM LVCM by using a ferromagnetic auxiliary yoke to construct a semi‐closed structure. Magnetic equivalent circuit method is utilised to analyse the effect of the auxiliary yoke on air‐gap flux density. Besides, finite element analysis is used to analyse the magnetic circuit and design the parameters of LVCM. The semi‐closed tubular LVCM topology is manufactured and the effectiveness of this topology is validated by experimental measurements. Results show that the thrust density of LVCM is improved effectively by using an auxiliary yoke at the end.