Magnetic assembly DXHM-2000

A Halbach array magnet is a configured arrangement of permanent magnet elements with a spatially rotating magnetization that amplifies the magnetic field on one side while cancelling it on the other. This geometry produces strong one-sided flux with reduced stray fields, enabling compact magnetic circuits.

Product applications

• Flexible refrigerator magnets (one-sided flux to enhance holding power)
• Magnetic levitation systems (Maglev / Inductrack)
• Halbach wigglers for synchrotrons and free-electron lasers (FELs)
• 0.7 T Halbach ion source (example)
• Halbach thruster assemblies (case use)
• Electron-beam Halbach assemblies (case use)
• Small 96-pole Halbach arrays
• Face 4-pole Halbach arrays
• High linear Halbach arrays
• Small Halbach rotors (e.g. 27 mm rotor)

Advantages

• Concentrates magnetic flux on one side while minimizing stray field on the opposite side
• More efficient use of magnetic material to produce strong directional fields
• Applicable to both circular and planar geometries

Disadvantages / limitations

• Assembly difficulty due to strong repulsive forces between adjacent magnet elements
• Mutual demagnetizing effects between neighboring magnets; risk increases at elevated operating temperatures

Configurations and design notes

• Can be implemented as circular or planar arrays; "bucking-magnet" geometries and the presence of an air gap can improve circuit efficiency
• An air gap is often used in designs to significantly improve Halbach magnetic circuit efficiency
• High-coercivity materials, careful mechanical assembly and magnetic simulation are typically required for robust arrays

Technical characteristics / specifications

• Type: Halbach array (magnetic assembly)
• Key property: one-sided flux concentration — boosted field on one side, cancelled field on the other
• Typical uses: refrigerator magnets (thin flexible magnets), magnetic levitation (Inductrack/Maglev), ion sources, thrusters, electron-beam systems, synchrotron/FEL wigglers
• Design considerations: assembly challenges due to repulsion between elements; demagnetization risk at high temperature; use of an air gap can improve performance
• Manufacturer: Xiamen Dexing Magnet Tech. Co., Ltd.