Design of linear voice coil motor with semi‐closed structure

Luo, Ciyong; Lin, Zhonglan; Sun, Jun‐Yi

doi:10.1049/iet-epa.2019.0241

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…In order to obtain the self-inductance change model of the macro-motion coil (Manh and Chen, 2020;Luo et al, 2019), the equivalent circuit of the macro-motion coil is established, as shown in Fig. 11.…”

Section: Kinetic Model Of Macro-motion Partmentioning

confidence: 99%

Nonlinear characteristics of the driving model of the coaxial integrated macro–micro composite actuator

Wang

Xiao

et al. 2022

Mech. Sci.

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Abstract. Nonlinearity is one of the important factors affecting the positioning accuracy of the macro–micro composite actuator. To improve the positioning accuracy of the driving model of the macro–micro composite actuator, this paper combines the research phenomenon of the nonlinear characteristics of the voice coil motor to model the nonlinear factors that affect the macro-moving part of the macro–micro composite actuator. Firstly, based on analyzing its structure and working principle, the variation law of the magnetic field intensity at the working air gap of the macro-motion part is analyzed by the finite element method, and the driving force model of the macro-motion part is established. Secondly, through the magnetic field simulation analysis, there is a magnetization phenomenon in the mover part, and the static friction model is established. Then, the experimental data are acquired and processed by building the experimental test platform of the actuator, and the variation model of the electromechanical time constant with the macro-motion displacement is established. Then, combined with the Stribeck model and the static friction model, the kinetic model of the macro-motion part is established. Finally, using the least square method identify the parameter model, the results are compared with the experiment. The results show that the magnetic field distribution at the working air gap of the macro-motion part of the macro–micro composite actuator is relatively uniform, but it is related to the macro-motion displacement and the macro-motion coil current. When the macro-motion part of the macro-micro composite actuator starts, the friction model can approximately reflect the change of friction force, the kinetic model of the macro-motion part can reflect the dynamic characteristics of the macro-motion part, and the matching degree is 92.97 %. The research results lay a theoretical and technical foundation for the development of a high-speed and large-stroke positioning controller of the macro-motion micro composite actuator.

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Section: Kinetic Model Of Macro-motion Partmentioning

confidence: 99%

Nonlinear characteristics of the driving model of the coaxial integrated macro–micro composite actuator

Wang

Xiao

et al. 2022

Mech. Sci.

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“…The Halbach array consists of two radially magnetised PMs which are in the opposite direction of magnetisation and three axially magnetised PMs. Luo and Lin [15] show the LVCM with Halbach array is a superior topology for its high air‐gap flux density. The Halbach permanent magnet array is mounted on a ferromagnetic support shaft, and the whole part works as a mover.…”

Section: Theoretical Analysismentioning

confidence: 99%

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

Luo

Zhao

2020

IET Electric Power Applications

Self Cite

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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.

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“…Scholars have further improved the performance of micro linear motors by using highly magnetic materials, designing Halbach arrays instead of conventional pole structures, as well as applying superconducting materials to make windings [6][7][8]. The electromagnetic linear actuators, as an important development direction of linear motors, have become a research hotspot for high-performance linear servo control due to the advantages of cogging-free torque, high linearity, simple structure, and convenient control compared to conventional permanent magnet synchronous linear motors [9,10].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Non-Singular Terminal Sliding Mode Control Method for Electromagnetic Linear Actuator

Tan

et al. 2022

Micromachines

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In this study, to further improve the dynamic performance and steady-state accuracy of the electromagnetic linear actuator (EMLA) for the direct-drive system, the adaptive non-singular terminal sliding mode controller (ANTSMC) based on an improved disturbance observer (IDOB) is proposed. Accurate modeling of the EMLA based on the LuGre friction model was obtained by identification. Aiming at the continuous disturbance of the system, a non-singular terminal sliding mode control based on improved exponential reaching law (IERL) is designed, which is combined with the advantages of fuzzy control. Adaptive adjustment of the IERL gain is achieved to ensure finite time convergence of the tracking error while suppressing system jitter. Based on the IDOB to achieve effective observation compensation under noise disturbance and further improve the system robustness. The stability of the control is analyzed based on the Lyapunov function. The results show that the proposed method suppresses the jitter and improves the tracking performance and robustness of the servo system for different desired trajectories effectively.

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Design of linear voice coil motor with semi‐closed structure

Cited by 11 publications

References 28 publications

Nonlinear characteristics of the driving model of the coaxial integrated macro–micro composite actuator

Nonlinear characteristics of the driving model of the coaxial integrated macro–micro composite actuator

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

Adaptive Non-Singular Terminal Sliding Mode Control Method for Electromagnetic Linear Actuator

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