Benefits of Using a Linear Halbach

  1. The main application for linear Halbach arrays is holding or pull force, however these can be used in other applications, ranging from medical, research, and sensors.
  2. Like circular Halbach arrays, a Linear Halbach is self-shunting. The magnetic field on one side of the Halbach array is very strong while the opposite side is almost zero. The magnetic field on the bottom proves very strong in simulations, while the top side shows almost no magnetic field. SM Magnetics offers FEA and simulations for specific designs.
  3. A Linear Halbach can be designed to project the field further or keep it closer to the surface. However, there is a point of diminishing returns and a linear Halbach is not the correct choice for applications requiring extended field throw. Since these arrays focus magnetic field at the surface, they have limited usefulness when the air gap between surface and target is too large.
  4. The array can be “tuned” to a specific air gap. As long as the air gap is appropriate, the array can be tuned so that the application utilizes the correct amount of magnetic field within the required distance.
FEA magnetic field profile of linear Halbach with directional arrows

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Other Considerations of Using a Linear Halbach

  1. The magnetic materials used to make a Linear Halbach should have a higher coercivity. Magnets risk demagnetization when exposed to high magnetic fields. Since Halbach arrays require magnets assembled with opposing fields pushed toward each other, linear versions need materials that can withstand this demagnetizing force.
  2. Assembly of a Linear Halbach is more difficult than multi-pole assemblies. The magnets will want to push apart during assembly, typically requiring a one-time jig or fixturing charge.
  3. Linear Halbachs are generally more expensive. This stems mainly from the need for higher coercivity materials and added labor time for assembly and manufacturing.

Speaking with a magnetics consultant helps determine if a Linear Halbach suits your application and what array design you need.

About SM Magnetics

SM Magnetics is a privately owned company providing assistance with magnets, magnetic circuit design, engineering support, and production. For more information, visit www.smmagnetics.com or call 205-621-8841.