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US 2003/0222525 A1Published application
Rotor unit for an electromotor and an internal rotor electromotor
AssigneeMinebea Co., Ltd.
InventorsHarald Rapp, Oswald Kuwert, Jurgen Oelsch
Life of this patent
Estimating the term…
Abstract
A rotor assembly for an electric motor having a rotor shaft and at least one permanent magnet arranged on the rotor shaft. The rotor shaft with the permanent magnet is accommodated in a sleeve the rotor shaft being freely rotatable within the sleeve. The sleeve is closed off by a flange at a first end face. An inner-rotor electric motor having a stator and a rotor assembly of the type described above, with the stator being inserted over the sleeve of the rotor assembly.
Claims15
A rotor assembly for a brushless d.c. motor, comprising:
- a rotor shaft having at least one permanent magnet mounted thereon;
- a sleeve accommodating said rotor shaft with said permanent magnet therewithin for a free rotation of said rotor shaft, said sleeve being open at both ends;
- a flange, said flange being connected with said sleeve at a first end face of said sleeve,
- a first bearing supporting said shaft;
- and
- a second bearing supporting said shaft,
- wherein a bearing seat for said first bearing is integrated into said flange at said first end face of said sleeve, wherein a bearing seat for said second bearing is integrated into said sleeve at a second end face of said sleeve, and wherein said first and second end faces of said sleeve are enclosed by said flange and said first and second bearings.
4 more elements
An inner-rotor d.c. motor comprising:
- a rotor assembly, said rotor assembly further comprising
- a rotor shaft having at least one permanent magnet mounted thereon;
- a sleeve accommodating said rotor shaft with said permanent magnet therewithin for a free rotation of said rotor shaft, said sleeve being open at both ends;
- a flange, said flange being connected with said sleeve at a first end face of said sleeve,
- a first bearing supporting said shaft;
- and
- a second bearing supporting said shaft;
- and
- a stator,
- wherein a bearing seat for said first bearing is integrated into said flange at said first end face of said sleeve, wherein a bearing seat for said second bearing is integrated into said sleeve at a second end face of said sleeve, wherein said first and second end faces of said sleeve are enclosed by said flange and said first and second bearings, and wherein said stator is inserted over said sleeve of said rotor assembly.
7 more elements
Dependencies are inferred from the claim text.