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US 2010/0244608 A1Published application
Permanent magnet, manufacturing method thereof, and rotor and ipm motor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKenji Nakamura, Shigeto Takeuchi, Keiu Kanada, Masafumi Suzuki, Tomonari Kogure
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Abstract
A manufacturing method for a permanent magnet includes the steps of a) producing a permanent magnet (1), b) fracturing the permanent magnet (1) to obtain two or more separate pieces (13), and c) restoring the permanent magnet (1) by fitting the fracture surfaces of adjacent separate pieces (13) together.
Claims22
A manufacturing method of a permanent magnet that is to be inserted into a slot of a rotor for an IPM motor, comprising:
- producing a permanent magnet of generally the same shape and size as the shape and size of the inside of the slot by pressure forming magnetic particles for the permanent magnet in a forming die;
- forming a small number of separate pieces by fracturing the permanent magnet;
- and
- restoring the permanent magnet by fitting fracture surfaces of adjacent separate pieces together,
- wherein the small number is predetermined and is bigger than 1.
2 more elements
Dependencies are inferred from the claim text.