Electric motor with thin rotor-damping layer
AssigneeU.S. Philips Corporation
InventorJan M. van de Griend
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Abstract
An electric motor has a rotor body elastically mounted on the shaft, the elastic mounting being relatively rigid in the axial direction. The shaft has an annular projection fitting in a circumferential recess in the bore of the rotor body. An elastic layer having a thickness which is small compared to the height of the annular projection is arranged at least between the circumferential surfaces of the annular projection and recess, and at least one radially extending face of the projection and recess.
Claims9
An electric motor, comprising a stator, a motor shaft, and a rotor mounted on the motor shaft,
- said rotor comprising a rotor body having a central bore, said shaft extending through said bore, and an elastic layer which connects the rotor body to said shaft,
- characterized in that said rotor body has a circumferential recess formed in said bore, said recess having a circumferential surface and a generally radially extending surface,
- said shaft comprises a circumferential annular projection disposed within said recess and a given radial height, said projection having a circumferential surface facing said recess circumferential surface, and a generally radially extending surface facing said recess generally radially extending surface, the radial distance between said circumferential surfaces and the axial distance between said facing generally radially extending surfaces each being less than said radial height, and
- said elastic layer is disposed at least between said circumferential surfaces and said generally radially extending surfaces, said elastic layer having a thickness which is small relative to the height of the circumferential projection.
An electric motor, comprising a stator, a motor shaft, and a rotor mounted on the motor shaft,
- said rotor comprising a rotor body having a central bore, said shaft extending through said bore, and an elastic layer which connects the rotor body to said shaft,
- characterized in that said rotor body has a circumferential recess formed in said bore, said recess having a circumferential surface and two generally radially extending surfaces,
- said shaft comprises a circumferential annular projection disposed within said recess and a given radial height, said projection having a circumferential surface facing said recess circumferential surface, and two generally radially extending surfaces respectively facing said recess generally radially extending surfaces, the radial distance between said circumferential surfaces and the axial distances between respective facing generally radially extending surfaces each being less than said radial height,
- said rotor body further comprising a respective edge portion disposed axially to each side of said recess, spaced from said shaft a radial distance less than the radial distance between said circumferential surfaces, and
- said elastic layer is disposed between said circumferential surfaces, said facing generally radially extending surfaces, and said rotor body edge portions and said shaft;
- and said elastic layer has a thickness which is small relative to said radial height, and a layer thickness between said edge portions and said shaft smaller than the layer thicknes in the recess.
Dependencies are inferred from the claim text.