This paper presents a novel parallel magnetic path hybrid excitation linear eddy current brake. The brake using scheme with the presence of PMs, whose flux lines in primary are oppositely directed respect to by windings, has effect mitigating saturation iron teeth primary. allows be fed more intense currents improving braking force. structure and working principle introduced. analytical model was found equivalent circuit method layer theory approach. design studied finite element method....

This study introduces a novel methodology based on the idea of double Fourier series and coil segmentation, performed governing equations, with harmonic magnetic field analysis double-sided air-cored superconducting linear synchronous motor for electrodynamic suspension train. method can solve generated by arbitrarily shaped coils. First, rectangular-shaped coils race-track-shaped as examples, process calculating using proposed is introduced comprehensively, influence end effect also...

This article presents the modeling and optimization design of a large load magnetic levitation gravity compensator. The proposed compensator comprises three layers 2-D permanent magnet (PM) arrays. middle mover layer can generate passive force to compensate for loads in some systems, such as measurement framework lithography machines or space optical equipment be tested on ground. To accurately predict force, an improved charge model is proposed, which actual working points each PM are...

Magnetic levitation positioning systems (MLPSs) are of great interest in high-precision applications vacuum. In this paper, a linear magnetic bearing with rhombus magnet array (RMA-LMB) for MLPS is proposed. With the RMA, proposed RMA-LMB possesses advantages excellent force uniformity, high density, and good manufacturability. First, basic structure operating principle presented. Second, expressions field, static torque, dynamic torque obtained by an equivalent current model. Third, 3-D...

A voice coil motor is a type of permanent magnet linear motor, which based on the Ampere force theorem. It has following advantages: simple structure, small size, no cogging force, and fast response time. In this study, was designed to provide x-directional thrust in magnetically levitated cable table lithography machine. The study Halbach array, adopted single-sided, coreless, flat-type structure. First, magnetic field distribution analyzed charge method obtain an expression for thrust....

Different from conventional switched reluctance motor(SRM), bearingless SRM not only provides torque but also supplies levitation force for free-friction of rotor. In order to make sure that can steadily levitates in static and dynamic rotating operation, it is necessary analyze suspending force. Therefore, performance an improved with permanent magnets stator yoke comprehensively investigated this paper. Basic structure operation principle are introduced firstly. Furthermore, mathematical...

Linear voice coil motors (VCMs) are widely used in some high precision or dynamic applications, such as lithography, digital cameras, and microscopes. In this article, a thrust linear VCM is analyzed designed, which for the position loop stiffness test of motor servo system. To guarantee structural strength frame provide space cooling channels, two layers’ arrangement adopted. Based on 2-D finite element method (FEM), ripple performance analyzed. Moreover, reasonable structure integrated...

Magnetic levitation vibration isolation platform are essential for testing space telescopes. This paper presents the design of a Large Air-Gap Voice Coil Motor (LAG-VCM) specifically use in such platforms. The electromagnetic voice coil motor begins with Equivalent Circuit Method, followed by analysis and optimization using Finite Element Analysis (FEA). Subsequently, prototype was constructed tested. test results confirm that meets specifications requirements.

With the advancement of manufacturing, precision requirements for various high-precision processing equipment and instruments have further increased. Due to its noncontact nature, simple structure, controllable performance, electromagnetic levitation has broad application prospects in ultra-precision ground testing aerospace equipment. Research on vibration isolation technology using is imperative. This paper reviews latest research achievements three types passive isolators five active...

Magnetic springs, which can be used to replace traditional mechanical have many advantages, such as necessitating no physical contact, generating friction, vibration or noise, and having a long lifespan. Nevertheless, their strong nonlinearity limits widespread application. In this study, we developed novel permanent magnet spring address issue: Halbach magnetic spring, with large levitation force an approximately linear characteristic curve. First, introduce the structure parameters of...

Linear voice coil motor (VCM) has the advantages of high precision and dynamic response, which fulfills requirements linear loading platform. In this article, a thrust double layer series magnetic circuit is analyzed designed. Based on 2-D FEM, ripple are optimized. Moreover, damping force support plate reduced by optimization material structure. Finally, VCM prototype with rating 2000 N manufactured tested, results have good consistency FEM results.

A large-load magnetic levitation gravity compensator is proposed in this paper, which can be used as the passive support scheme for large optical facilities to achieve ground testing. The composed of three layers 2D PM array, middle mover. analytical model built based on charge model. Furthermore, an improved considering actual working point presented and verified by 3D finite element simulation. Finally, influence analysis main parameters such pole pitch, pole-arc coefficient, thickness air...

In this paper a novel series magnetic path hybrid excitation linear eddy current brake was presented. The using the scheme has many advantages, such as controllability, energy saving, and large force density. structure working principle were introduced. analytical model found equivalent circuit method layer theory approach. braking characteristics predicted derived model. A two-dimensional finite element analysis employed to confirm validity of Finally, relationship among design parameters...

Magnetic levitation vibration isolators have attracted more and attention in the field of high-precision measuring machining equipment. In this paper, we describe a tubular horizontal-gap passive magnetic isolator. Four typical topologies isolator are proposed. The analytical expression force is derived. relationship between force, density, ripple major structural parameters analysed by finite element method, which conductive to design optimization characteristics different compared...

Linear voice coil motor (VCM) has the advantages of high precision and dynamic response, which fulfills requirements linear loading platform. In this article, a thrust double layer series magnetic circuit is analyzed designed. Based on 2-D FEM, ripple are optimized. Moreover, damping force support plate reduced by optimization material structure. Finally, VCM prototype manufactured tested, results have good consistency with FEM results.