Permanent magnet rotor, method for the production thereof using a magnetizing fixture
AssigneeBühler Motor GmbH
InventorsMladen Zec, Armin Suttner-Reimann, Heinz Günther
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Abstract
A permanent magnet rotor (1) with a magnetically conductive magnetic core (2), which has a plurality of magnet retainers (3, 4) for radially arranged and essentially tangentially magnetized permanent magnet parts (9), and a method for the production thereof. With a common permanent magnet rotor, the object of the present invention is to ensure a simple installation for a low number of components to be installed, very good magnetizability, high strength of the mechanical connection of the permanent magnet parts in the magnet retainers, and a compact size.
Claims21
A permanent magnet rotor comprising:
- a magnetically conductive magnetic core having a circumference, with a plurality of magnet retainers positioned about the circumference;
- radially arranged and essentially tangentially magnetized permanent magnet parts each being placed in one of the plurality of magnet retainers;
- and
- the magnetic core axially made up of at least first and second sub-cores with the permanent magnet parts extending across more than one sub-core.
A method for producing a permanent magnet rotor with a magnetically conductive magnetic core, which has a plurality of magnet retainers for radially arranged and essentially tangentially magnetized permanent magnet parts, the method comprising the steps of:
- providing multiple non-magnetized permanent magnet parts;
- magnetizing the permanent magnet parts in a conventional magnetizing fixture;
- providing at least one sub-core;
- Inserting the multiple magnetized permanent magnet parts having a subsection into every other magnet retainer of the sub-core about the periphery of the sub-core, whereby a rotor assembly is produced.
A method for producing a permanent magnet rotor with a magnetically conductive magnetic core, which has a plurality of magnet retainers for radially arranged and essentially tangentially magnetized permanent magnet parts, the method comprising the steps of:
- providing a sub-core and multiple permanent magnet parts;
- inserting the multiple non-magnetized permanent magnet parts having a subsection into every other magnet retainer of the sub-core about the periphery of the sub-core, whereby a rotor assembly is produced;
- inserting the rotor assembly into a magnetizing fixture, wherein magnetizing coils are inserted into the empty magnet retainers, not equipped with permanent magnet parts, of the sub-core of the rotor assembly and available subsections of the permanent magnet parts, which project from the sub-core, and are inserted into magnet recesses of a magnetizing element of the magnetizing fixture;
- simultaneously magnetizing both subsections of the permanent magnet parts;
- and
- ejecting the rotor assembly from the magnetizing fixture.
A device for magnetizing a permanent magnet rotor (1) having a magnetically conductive magnetic coil, which has a plurality of magnet retainers for permanent magnet parts, which are arranged radially around a rotor axis of rotation of the permanent magnet rotor and are to be essentially tangentially magnetized, the device comprising:
- a magnetizing element with 2n magnet recesses,
- n magnetizing coils, which are retained in every other magnet recess, wherein a large part of the magnetizing coils protrudes axially from the magnetizing element and with a retaining device, which is arranged between at least two magnetizing coils.
Dependencies are inferred from the claim text.