Neodymium Halbach Array Motor Magnets Technical Specifications:
Material Neodymium Magnet
Mold No.: MPHARM-08
Size: 80mm O.D. x 30mm I.D. x 60mm length
(segment magnet length 60mm)
Pole number: 6 poles (12 magnets)
Max. work Temp.: 80 ℃
Magnet material: NdFeB N50
Housing material: steel alloy
Coating NI-CU-NI
Magnetism direction K2 assembled
Lead Time About 30 days
Sample Avaliable
Certification ISO9001
Tolerance +/- 0.05mm
MPCO Magnetics can design, produce and supply Halbach Arrays to customer requirements. We specialise more in the Halbach Array cylinders although we can assist in the supply of any Halbach Array design. n52 arc halbach array magnet
A typical Halbach Array design is the dipole (two pole) NdFeB Halbach Array cylinder where a ring of NdFeB magnets are assembled within a non-magnetic retaining ring to create a high magnetic field within the central air gap – the field lines being uniformly ditributed (homogenous) across the diameter of the air gap.
An example is a Dipole Halbach Array of Magnet Inner Diameter 30mm, Magnet Outer Diameter 80mm and Magnet Axial Length 30mm made using high strength NdFeB magnets (12 arc segments, each with a specific Direction of Magnetisation to pull magnetism around the ring shape of the magnetic assembly) which offers around 1T (10000 Gauss) right in the centre which drops to 0.6T (6000 Gauss) at the axial ends. Longer axial length units give slightly higher magnetic field output with increasing central axial section of more uniform high field output (the field will still drop towards the ends). Lengths of 60mm are possible in this example without the need to split the assembly into two or more axial sections. Higher homogeneity of field (uniformity of cross the diameter) is possible by using more arc segments.
The magnitude of magnetic field within the air gap can be modelled using our 3D Magnetic FEA software although the field can be crudely estimated since it is proportional to the natural logarithm of outer to inner diameter ratio times the Br of the magnetic material.
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