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access icon free Analysis and restraining of eddy current damping effect in linear voice coil motor

  • Author(s): Ciyong Luo 1  and  Rui Zhao 1
    • View affiliations
  • Source: Volume 14, Issue 5, May 2020, p. 837 – 842
    DOI:  10.1049/iet-epa.2019.0696 , Print ISSN 1751-8660, Online ISSN 1751-8679
© The Institution of Engineering and Technology
Received 17/08/2019, Accepted 19/12/2019, Revised 14/11/2019, Published 19/12/2019

In the case of designing linear voice coil motors (LVCMs), the aluminium tube is usually used to support and fix the windings. Due to the high-speed linear reciprocating motion, the eddy-current damping force in aluminium tube has a large effect on the dynamic characteristic of LVCMs and weakens the resultant force. In this study, an LVCM with forward winding is studied. The cause of eddy current damping force in the original structure of the aluminium tube is analysed, and the corresponding mathematic model is established which is verified by finite element method. To restrain the damping effect, three restraining measurements have been discussed. Then a novel structure of aluminium tube with axial slits and ribbed stiffeners is proposed according to the simulation analysis. During the experimentation process, the mover resultant force is replaced with its acceleration. Results show that the mover acceleration of LVCM with stiffened aluminium tube is bigger than that of the initial one. Hence the resultant force of the proposed structure is improved effectively and the new structure has a good inhibition effect on eddy-current damping effect.

Inspec keywords: damping; linear motors; servomechanisms; eddy currents; finite element analysis; aluminium

Other keywords: winding; stiffened aluminium tube; inhibition effect; eddy-current damping effect; restraining measurements; linear voice coil motor; mover resultant force; eddy current damping force; LVCM

Subjects: Numerical analysis; Finite element analysis; Linear machines; Vibrations and shock waves (mechanical engineering); Mechanical components

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