Technical
Magnetisation directions
Sintered NdFeB is anisotropic: the easy-axis orientation is fixed during pressing and cannot be changed afterwards. Magnetisation and polarity are applied later along this orientation. Both must be on the drawing.
Axial (through thickness) — common for discs and through-thickness blocks; arrow along the specified axis.
Diametral — across the diameter of a disc or ring.
Radial (segment) — for arc segments in rotors; orientation follows the radius, so each segment is pressed in a dedicated die.
Multi-pole ring — several poles on one ring; requires a magnetising fixture; specify pole count and skew.
Halbach arrangements — a sequence of orientations across a set; specify per position.
Whether magnets are delivered magnetised or unmagnetised (magnetised after assembly) changes handling, shipping class and fixture cost. State which you need.
Technical references
Updated
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