Static field modeling of a halbach rotor comsol multiphysics. Comsol requires that every type of simulation included in the package has the ability to be combined with any other. An alignment method of humanrobot collaboration based on the sixdimensional forcetorque dynamic measurement for largescale components. With more than 30 addon products to choose from, you can further expand the simulation platform with. Halbach arrays have recently been used to continuously sort micrometersized magnetic particles with a fluid channel placed over the high flux side of the array. Design optimization of a linear generator with dual. Benefits and drawbacks to using halbach arrays dura. In the picture on the left, klaus halbach in 1986 with kwanje kim discussing a model of an undulator that halbach designed. Optimal halbach permanent magnet designs for maximally. Liyan qu a linear generator for human motion energy harvesting is designed and optimized in this study. The version of lmgrd must be the same or higher than the flexnet version used by the comsol software.
Motoranalysispm free software for design and analysis of permanent magnet machines. We present an experimentally validated analytical procedure to design nested halbach cylinder arrays for magnetic cooling applications. By simulation of finite element software ansofts maxwell, the results show that improved magnet structure can effectively improve the uniformity of the magnetic field within the array comparing with oneonpole halbach magnet array composed by fanbased units. A stable film is crucial to maintain a minimum wetting rate, to circumvent the dryout condition.
Engineers, researchers, and scientists across industries use multiphysics simulation to research and develop innovative product designs and processes. Comsol multiphysics software is used to explore the impact of distributor width on the film thickness, and the resulting sensitivity of overall thermal efficiency in a plate and frame tripleeffect evaporator. As is shown in 7 a discrete halbach array can, quite easily, be made to approximate a continuous one very well. The solution for the example problem is shown below in figure 4. This is achieved by having a spatially rotating pattern of magnetisation. Find inspiration in technical papers and presentations they have presented at the comsol conference. Halbach array magnetic field distribution, halbach array magnetic analysis. This means that the comsol license server needs to be upgraded to comsol 5. The procedure aims at maximizing the magnetic flux density variation in the core of the array for a given set of design parameters, namely the inner diameter of the internal magnet, the air gap between the magnet cylinders, the number of. You will experience speedup by a factor of up to ten in software responsiveness, as well as new and improved features for solving, meshing, and the physicsbased addon modules.
Halbach array article about halbach array by the free. Popular free alternatives to comsol multiphysics for windows, linux, mac, web, gnu octave and more. The wavelengths of the magnetization are in all the three cases equal to the individual widths of the arrays. All flux is external to the magnet is concentrated on the top side of the array. A halbach array is a special arrangement of permanent magnets that augments the magnetic field on one side of the array while cancelling the field to near zero on the other side. When defining and solving these problems, the fluid is modeled as incompressible. Whenever people start talking about strong magnets, the halbach design always comes up. Mar 01, 2012 figure 3 shows a schematic of a 2dimensional halbach array sample. Magnetic circuit design comparison when to use a halbach array despite the many beneficial properties of a halbach array, it is not necessary to use a halbach array for every application where magnetic fields are needed. These results were used to decide on a 45degree offset between the magnets of the halbach array, allowing for a significant increase in magnetic.
This paper proposes an improved magnet structure of halbach array. The array was originally designed to help focus the beams in particle accelerators. The diagram 2 looks like a monopole, because there is the same direction of flux all the time. Using comsol multiphysics for the development of an arc. Cfd software for simulating fluid flow applications comsol. Warning your internet explorer is in compatibility mode and may not be displaying the website correctly. The comsol software automatically formulates the energy equation coupled to the momentum and mass balance equations for ideal gases. Two discrete with m 5andm 9, respectively and one continuous bottom halbach array. In both cases, when meshing these models, automatic mesh refinement resolves the shock pattern by refining around the regions with very high velocity and pressure gradients. The cylindrical halbach array was installed at the joint of an industrial robot and generated joint torque through a magnetic field to compensate the additional torque of the load precisely.
The combination of comsol products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. However, especially for the case of surfacemount permanent magnet motors, a magnetization direction that varies throughout the volume is desired. The linear generator can be used to convert human motion energy to. This might be a question better suited for the software recommendations side of s. It allows conventional physicsbased user interfaces and coupled systems of partial differential equations pdes.
Comsol multiphysics is an engineering, design, and finite element analysis software environment for the modeling and simulation of any physicsbased system. Hi i do not have the feeling it has changed from 3. With comsol multiphysics, you will be able to account for coupled or multiphysics phenomena. The simulations of superconducting halbach array were carried out using hformulation based on bdependent critical current density and bulk approximation, with. On the optimization of halbach arrays as energy storage media. Comsol provides an ide and unified workflow for electrical, mechanical, fluid, acoustics and chemical applications. This is directly relevant for optimizing magnetic injection forces to deliver therapy into the inner ear, which is at a.
If the magnetic field contributions of each magnet are added, then the maximum magnetic flux density, b max, of the nhc is observed at the core of the inner. The acdc module was used to evaluate and optimize the magnetic flux densities of multiple different halbach array configurations, allowing for rapid prototyping of the rotor. In his keynote talk at the comsol conference 2018 lausanne, andri bezzola of. In 2017, boisclair of laval university in canada studied a method combining of gravity compensation and the sixdimensional forcetorque ft sensor with a cylindrical halbach array. The effect of halbach array is simply to push the closed magnetic field line on one side, hence the resulting magnetic field was enhanced on one side. Forum halbach array mandhala polar define magnetization directions. Apr 17, 2011 this paper proposes an improved magnet structure of halbach array. The simulations of superconducting halbach array were carried out using hformulation based on bdependent critical current density and bulk approximation, with the fem platform comsol multiphysics. Research and simulation of an improved halbach arrays ieee. The site is made by ola and markus in sweden, with a lot of help from our friends and colleagues in italy, finland, usa, colombia, philippines, france and contributors from all over the world. Comsol multiphysics is a generalpurpose software platform, based on advanced numerical methods, for modeling and simulating physicsbased problems.
Shapiroa,b,c a fischell department of bioengineering, college park, md, usa b institute for systems research, usa c university of maryland at college park, usa d h. Any arrangement of a dipole magnet would not result in any monopole. We also offer over 30 addon products that are designed to fit your specific simulation needs, including tools for modeling mechanical, chemical. The procedure aims at maximizing the magnetic flux density variation in the core of the array for a given set of design parameters, namely the inner diameter of the internal magnet, the air gap between the magnet cylinders, the number of segments of each. This final piece in our four part series on halbach arrays discusses the benefits and drawbacks to using these arrays. Research and simulation of an improved halbach arrays. But once you connect to c you can connect to fortran, pascal and other traditional numericalmethod software, which will give you great performance that you cant get connecting to high level software like excel, for instance. This model presents the static field modeling of an outward flux focusing magnetic rotor using permanent magnets. If each individual magnet contains no magnetic monopole, i.
This magnetic rotor is also often called a halbach rotor. Motoranalysispm free software for design and analysis of permanent magnet machines duration. A halbach array is the special arrangement of permanent magnets with alternating polarization designed to make the magnetic field on one side much higher than the field on the other side. On the high flux side, the magnetic force in 1 is maximal, due to saturated large values of m on the particles and the large field gradient. With more than 30 addon products to choose from, you can further expand the simulation platform with dedicated. Comsol multiphysics alternatives and similar software. No, the halbach array is not related to the monopole at all. As illustrated, the goal is to choose the optimal magnetization directions indicated by the blue arrows to maximize the pull or push magnetic force at x 0,y 0. By simulation of finite element softwareansofts maxwell, the results show that improved magnet structure can effectively improve the uniformity of the magnetic field within the array comparing with oneonpole halbach magnet array composed by fanbased units. If the magnetic field contributions of each magnet are added, then the maximum magnetic flux density, b max, of the nhc is observed at the core of the inner magnet, as. Halbach magnetization example conclusions this example has shown how magnetization direction can be defined as a function rather than as a constant value. Alternativeto is a free service that helps you find better alternatives to the products you love and hate.
How to set up and run a simulation with comsol multiphysics a proper introduction on how to set up and run a model in comsol multiphysics is essential when learning how to use the software. Halbach arrays, both planar and circular, produce a magnetic field similar to what a powered solenoid electromagnet would create, but without the extra size, cost, and maintenance. Modeling circular halbach array comsol multiphysics. The modeling of this superconducting halbach array magnet has been executed by comsol multiphysics. Planar halbach arrays contain the magnetic field to one side of the array, while a circular halbach array concentrates the magnetic field on the id or od. Supermagnetman fundamentals of halbach arrays youtube. Milton stewart school of industrial and systems engineering isye, georgia institute. This abstract describes a comsol app that has been created to perform thermal.
Wikipedia has a good section on the basics but i wanted to help people understand. Design optimization of a linear generator with dual halbach array for human motion energy harvesting wenjia zhao, m. The software was used to simulate our halbach arrays with their magnet pole configurations and to determine the forces obtained as well as the heat generated, magnetic field strength and. Radial magnetization introduction in most cases, permanent magnet regions are defined with a constant magnetization direction for the entire region, as described in the permanent magnet example. Design of a weightedrotor energy harvester based on. All the field lines go out have to come back at the next nearest neighbor.
All of the features listed below are implemented through associated physics interfaces. The rotating pattern of permanent magnets on the front face. Comsol webinar modeling coils and electric devices duration. The cylindrical halbach array was installed at the joint of an industrial robot and generated joint torque through a magnetic field to compensate the additional torque of the load precisely 19. Cfd software for simulating fluid flow applications. When a wreh is designed with a suitable characteristic length, the rotors natural frequency changes according to the wheel rotation speed and the. The halbach array is named for its inventor klaus halbach, a berkley labs physicist in the engineering division. Certain characteristics of comsol become apparent with use. This discussion is about an older version of the comsol multiphysics software. Design of nested halbach cylinder arrays for magnetic. To help the learning process, there is a streamlined.
This paper proposes the design of a weightedrotor energy harvester wreh in which the oscillation is caused by the periodic change of the tangential component of gravity, to harvest kinetic energy from a rotating wheel. Deep reach can be optimized by maximizing the pull or push forces at a x 0,y 0 location far from the halbach array. Glenn research center has a wealth of experience in halbach array technology through the fundamental aeronautics program. Nested halbach cylinders nhc were used recently in amr apparatuses. The goals of the program include improving aircraft. Particular functionality may be common to several products. Optimal halbach permanent magnet designs for maximally pulling and pushing nanoparticles a. Hformulation together with bdependent critical current density and bulk approximation are used. This is a very powerful, 3dprinted brushless dc electric motor. Jun 16, 2016 comsol webinar modeling coils and electric devices duration. Comsol multiphysics is a crossplatform finite element analysis, solver and multiphysics simulation software. Thats right, all the lists of alternatives are crowdsourced, and thats what makes the.
As of update 2, the new rotordynamics module is available as an optional addon to the structural mechanics module. Comsol multiphysics was used to aid the strathclyde hyperloop university team in designing our pod, specifically the propulsion and levitation systems. I am looking for a free not only as in freedom alternative to comsol multiphysics. Kanade explained that, comsol connects to other software like matlab and excel. It has 600 watts, and performs with more than 80% efficiency. Gallo national aeronautics and space administration glenn research center cleveland, ohio 445 abstract the nasa john h. Browse over 3,000 papers and posters on multiphysics simulation that were presented at the comsol conference worldwide. Comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the technical support team.
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