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US 7,030,530 B2Granted
Permanent magnet element and electric machine
AssigneeABB AB
InventorJukka Malmberg
Life of this patent
Estimating the term…
Abstract
A permanent magnet element intended especially for electrotechnical devices and an electric machine, the element (1) comprising at least one permanent magnet piece (10). The permanent magnet element (1) also comprises a protective cover (11) that is arranged to partly surround the permanent magnet pieces (10) arranged in the element, and the permanent magnet element (1) also comprises one or more fastening elements (13; 21).
Claims19
A permanent magnet element for attachment to an outer surface of an electrotechnical device, comprising;
- at least one permanent magnet piece having a surface portion and being mountable with respect to the surface portion of the electrotechnical device for magnetically interacting therewith,
- a protective cover formed with at least one open side, said cover being arranged to partly surround the permanent magnet piece or pieces, said cover having inner surface portions for engaging the outer surface of the electrotechnical device-in confronting relationship, said cover for supporting the magnetic piece or pieces such that the surface portion of each magnetic piece or pieces is in alignment with the surface portion of the cover and likewise disposed in close proximity to the surface portion of the electrotechnical device, said cover having end portions, each end portion being formed with a circumferential flange having inner and outer surface portions, said flange extending laterally of the cover, the inner surface portions thereof for engaging the outer surface portions of the electrotechnical device in confronting relationship, and
- one or more fastening elements for radially engaging the outer surface portions of the flanges externally of each flange and securing the cover to the surface of the electrotechnical device.
An electric machine comprising:
- a rotor having an outer surface portion;
- and
- a permanent magnet element for at least partly magnetizing the rotor, said permanent magnet element comprising:
- one or more permanent magnet pieces each having a surface portion for engaging the outer surface of the rotor;
- and
- a protective cover formed with inner and outer surface portions and at least one open side formed in the inner surface portion, said cover being arranged to partly surround the permanent magnetic piece or pieces, the inner surface portions of the cover for engaging the outer surface of the rotor in confronting relationship, said cover for supporting the magnetic piece or pieces such that the surface portion of each magnetic piece or pieces is in alignment with the inner surface portions of the cover and likewise disposed in close proximity to the surface of the rotor, said cover having end portions, each end portion being formed with a circumferential flange having inner and outer surface portions, and the inner surface portion of the flange engaging the outer surface of the rotor, one or more fastening elements for engaging the outer surface portion of flanges and securing the cover in confronting relationship to the surface of the rotor.
3 more elements
Dependencies are inferred from the claim text.