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Halbach Array Magnet
A Halbach array is a specific arrangement of a series of permanent magnets. The array has a spatially rotating pattern of magnetism which cancels the field on one side but boosts it on the other. The major advantages of Halbach Arrays are that they can produce strong magnetic fields on one side whilst creating a very small stray field on the opposite side. This effect is best understood by observing the magnetic flux distribution.
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Halbach Array Magnet
A Halbach array is a specific arrangement of a series of permanent magnets. The array has a spatially rotating pattern of magnetism which cancels the field on one side but boosts it on the other. The major advantages of Halbach Array Magnet are that they can produce strong magnetic fields on one side whilst creating a very small stray field on the opposite side. This effect is best understood by observing the magnetic flux distribution.
Applications
• One-sided flux is useful in many applications – data security – transportation – motor design
• Halbach Array Magnet are inherently weight-efficient.
• Arrays provide higher fluxes than monolithic magnets of the same size.
Halbach Array Magnet now have many applications and are used in a range of systems of varying complexity. One of the simplest applications of Halbach Array Magnet is in refrigerator magnets. In this case, the one-sided flux properties are exploited in order to boost the holding power of the magnet. Variable arrays of rod magnets can also be combined to create simple locking systems. If the magnetizations of the rods are arranged so the field is maximized above the plane and minimized below it, the flux confinement can be flipped by rotating each rod magnet 90°.
A more advanced example of a Halbach Array in action is in a Maglev train track or Inductrack, where magnetic levitation is used to support the carriage. The magnetic arrays lift the train a small distance above the track and can support a weight of up to 50 times that of the magnet. The operation is based on the principle of induction; as the array is passed over the metallic track coils, the variations in the magnetic field induces a voltage in the track. The track then creates its own magnetic field and, similarly to when you attempt to push the two like poles of neodymium bar magnets together when this field aligns with the field produced by the Halbach Array, repulsion causes the train to levitate.
Halbach Array Magnet are also used in advanced scientific experiments such as synchrotrons and free-electron lasers, where they are known as Halbach ‘wigglers’. FELs have a very wide and highly tunable frequency range and are used in many applications ranging from medical to military.
• Halbach Array Magnet are inherently weight-efficient.
• Arrays provide higher fluxes than monolithic magnets of the same size.
Halbach Array Magnet now have many applications and are used in a range of systems of varying complexity. One of the simplest applications of Halbach Array Magnet is in refrigerator magnets. In this case, the one-sided flux properties are exploited in order to boost the holding power of the magnet. Variable arrays of rod magnets can also be combined to create simple locking systems. If the magnetizations of the rods are arranged so the field is maximized above the plane and minimized below it, the flux confinement can be flipped by rotating each rod magnet 90°.
A more advanced example of a Halbach Array in action is in a Maglev train track or Inductrack, where magnetic levitation is used to support the carriage. The magnetic arrays lift the train a small distance above the track and can support a weight of up to 50 times that of the magnet. The operation is based on the principle of induction; as the array is passed over the metallic track coils, the variations in the magnetic field induces a voltage in the track. The track then creates its own magnetic field and, similarly to when you attempt to push the two like poles of neodymium bar magnets together when this field aligns with the field produced by the Halbach Array, repulsion causes the train to levitate.
Halbach Array Magnet are also used in advanced scientific experiments such as synchrotrons and free-electron lasers, where they are known as Halbach ‘wigglers’. FELs have a very wide and highly tunable frequency range and are used in many applications ranging from medical to military.
Hot Tags: Halbach, Magnet, Array
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