Design process of square column-shaped voice coil motor for magnetic levitation stage

Ahn, Dahoon; Kim, Hyun-Chang; Choi, Kyungwho; Choi, Yun‐Jaie; Lim, Jae-Yong

doi:10.3233/jae-190029

Cited by 8 publications

(9 citation statements)

References 18 publications

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“…However, a high current will cause serious heating, which usually requires additional cooling measures. For example, the Hitachi moving coil servo valve adopts a high current to ensure its dynamic characteristics, while compressed air is required to forcibly dissipate heat [12][13][14]. The proportional solenoid is widely used as an EMC for electro-hydraulic proportional valves.…”

Section: Introductionmentioning

confidence: 99%

Novel Magnetic Circuit Topology of Linear Force Motor for High Energy Utilization of Permanent Magnet: Analytical Modelling and Experiment

Meng

Liu

et al. 2021

Actuators

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The magnetic circuit of existing linear force motors does not consider the issue of energy utilization of permanent magnets, and the structure is complicated. To achieve high energy utilization and simplify the structure, this paper presents a novel magnetic circuit topology for the linear force motors of electro-hydraulic servo-proportional valves. In order to rapidly and accurately calculate the static characteristics of the force motor, an analytical model is established by using the equivalent magnetic circuit method. The model comprehensively considers the magnetic leakage effect, edge effect, and permeability nonlinearity. A prototype of the force motor is designed and manufactured, and a special experimental platform is built. The prototype force motor has a linear force-displacement characteristic and the output force increases with the increase of the excitation currents, which can reach about 41N at 2A. This indicates that it is suitable as an electro-mechanical converter for electro-hydraulic servo-proportional valves. Moreover, the analytical model is used to perform parameter optimization and calculate the magnetic flux density in the working air gap and the force-displacement characteristics under different excitation currents. The results are in good agreement with the electromagnetic field finite element simulation and experimental results. They indicate that the analytical model can rapidly and accurately predict the static characteristics of the force motor. The research work provides good reference means for the design of magnetic circuit topology with consideration of the high energy utilization of permanent magnets, and also the accurate analytical modeling of valve electro-mechanical converters.

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Section: Introductionmentioning

confidence: 99%

Novel Magnetic Circuit Topology of Linear Force Motor for High Energy Utilization of Permanent Magnet: Analytical Modelling and Experiment

Meng

Liu

et al. 2021

Actuators

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“…The former mainly includes voice coil motor, and the latter mainly includes linear force motor (LFM) and proportional solenoid. The forcedisplacement characteristic of voice coil motor has excellent linearity, [18][19][20] but the moving coil component has large volume and fragile structure, 21 and it needs large excitation current to obtain better dynamic response, which results in severe heat dissipation and additional cooling measures are required.…”

Section: Introductionmentioning

confidence: 99%

Novel modulation approach of flat force–displacement characteristic of linear electro-mechanical converter for electro-hydraulic servo-proportional valve

Meng

Heng

Sheng

2022

Proceedings of the Institution of Mechanical Engineers, Part I:

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Flat force–displacement characteristic has crucial influence on the performance of linear electro-mechanical converter of electro-hydraulic servo-proportional valves. The commercial proportional solenoids obtain such features by welding a non-magnetic separator ring, which is complicated and time-consuming. This article presents a novel modulation approach to obtain the flat force–displacement characteristic of linear electro-mechanical converter by constructing a by-pass air gap. Taking an existing linear force motor as an example, the force–displacement characteristic curves of the linear force motor with by-pass air gap and without by-pass air gap are both studied using magnetic circuit analysis and finite element method under different excitation currents. Based on the finite element method simulated data, the response surface method is used to perform the experiment design for structure parameters of linear force motor with by-pass air gap, and the quadratic fitting equations are obtained for further optimization. To balance conflicted design objectives such as linearity, mean value of output force and power-to-weight ratio, the structural parameters of the linear force motor with by-pass air gap are optimized using a multi-objective optimization algorithm based on particle swarm. Prototypes of linear force motor with by-pass air gap and without by-pass air gap are both manufactured, and a special test rig is built. The static and dynamic experimental results are consistent with the theoretical analysis. The former proves that the linear force motor with by-pass air gap can obtain a nearly flat force–displacement curve with reasonable parameter optimization and also improve output force, and the latter reveals that a linear electro-mechanical converter with flat–displacement characteristic has better working stability over common ones. The proposed modulation approach provides a new approach for the design of flat force–displacement characteristic of linear electro-mechanical converter.

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“…Furthermore, there is no connection unit, such as a guide, between the moving components and the ground, making it suitable for achieving a high degree of precision. Thus, a maglev device is the latest system, and many studies have been conducted on it in the last 30 years [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, a voice coil motor (VCM) is widely used as an actuator in a maglev device in order to implement nanometer-level precision in a short stroke [8][9][10][11][12][13][14]. Since the VCM has a very simple structure and there is no mechanical contact between the mover and the stator, it does not suffer from friction or backlash, resulting in high precision and a rapid response.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang and Meng studied a VCM composed of a double-sided magnet pair for a maglev device [11]. Choi et al [17] and Ahn et al [12] proposed a VCM with an axial symmetric rectangular structure that can produce considerable force, studied the optimal design method, and tested its mechanical and electrical characteristics. Lee et al [18] optimized the shape of the permanent magnet and yoke by considering the magnetic saturation effect in order to maximize the force of a VCM with a steel and permanent magnet.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of High Force Voice Coil Motors for Magnetic Levitation

Kim

Ahn

2020

Actuators

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A voice coil motor is a simple and linear electromagnetic actuator. Since it has a non-contact force and very low stiffness, it is widely used for precision positioning devices including magnetic levitation systems. During magnetic levitation, high force of a voice coil motor is required to compensate for the weight of the device and ensure a fast dynamic response. In this paper, two types of voice coil motors were analyzed by their volumetric change. The change of the generated force according to the volumetric change was inspected by finite element simulation models. The enhancement of force was dependent on which type of the voice coil motor is used, which component is enlarged, and which direction is the voice coil motor expands in. Based on the analysis results, two voice coil motors were optimally designed for a magnetic levitation positioning device. As a result of the design, it was confirmed that different types of voice coil motor generate different forces even if they have the same volume. For the two types of voice coil motors, the force differed by up to 40%.

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Design process of square column-shaped voice coil motor for magnetic levitation stage

Cited by 8 publications

References 18 publications

Novel Magnetic Circuit Topology of Linear Force Motor for High Energy Utilization of Permanent Magnet: Analytical Modelling and Experiment

Novel Magnetic Circuit Topology of Linear Force Motor for High Energy Utilization of Permanent Magnet: Analytical Modelling and Experiment

Novel modulation approach of flat force–displacement characteristic of linear electro-mechanical converter for electro-hydraulic servo-proportional valve

Analysis of High Force Voice Coil Motors for Magnetic Levitation

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