Permanent magnet rotor with distributed permanent magnets
AssigneeBühler Motor GmbH
InventorsMatthias Ahrens, Olaf Richter, Georg Bernreuther, Nikolaus Dietrich, Arnold Scheer
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Abstract
A permanent magnet rotor of an electric motor, consisting of a return body and a number of sintered permanent magnets distributed on the case of the return body at intervals, connected to a plastic mass filled with hard magnetic material. The objective of the present invention is to ensure that a generic permanent magnet rotor can be simply and economically produced, along with allowing a great degree of freedom regarding the design of the pole faces, wherein high rigidity and security of the mechanical connection between the permanent magnets and the return body are guaranteed.
Claims10
A permanent magnet rotor of an electric motor, the rotor comprising:
- a return body;
- a number of sintered permanent magnets distributed around the return body at intervals;
- and
- a plastic mass filled with hard magnetic material connected to the permanent magnets;
- wherein the permanent magnets are plate-shaped block magnets, and the hard magnetic material in the plastic mass is oriented towards magnetic field lines of the permanent magnets due to the force of the permanent magnets.
A method for the production of a permanent magnet rotor, the method comprising the steps of:
- a) providing a return body;
- b) positioning pre-magnetized permanent magnets on the return body;
- and
- c) insert-molding of the return body and the permanent magnets with a plastic mass filled with magnetic particles, wherein the magnetic particles are oriented to the magnetic fields of the pre-magnetized permanent magnets.
Dependencies are inferred from the claim text.