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US 6,548,930 B1Granted
Electric motor
AssigneeMannesmann VDO AG
InventorsPeter Marx, Bernd Jäger, Hans-Dieter Wilhelm, Michael Bämpfer
Life of this patent
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Abstract
An electric motor for a fuel pump wherein fuel flows through the pump, includes spring elements provided for holding magnetic shells in the stator have a face which points toward a rotor and is flush with the magnetic shells. Turbulence in the flow of the fuel within the electric motor are thereby kept particularly low. The pressure loss during the flow through the electric motor thus becomes lower. The pump according to the invention consequently has high efficiency.
Claims5
An electric motor for a fluid pump comprising:
- (a) a rotor assembly having coils arranged on a shaft;
- and
- (b) a stator assembly surrounding the rotor assembly and defining an annular fluid passage between the rotor and the stator, the stator assembly including:
- (1) a tubular stator housing having an inner wall and a diaphragm portion that covers circumferential stops of the stator housing;
- (2) a plurality of magnetic shells disposed in contact with the tubular housing inner walls at arcuately spaced apart locations, wherein the shells have arcuate inner surfaces that are all the same radial distance from the tubular housing inner wall and the rotor assembly;
- and
- (3) a spring element located in each space between each pair of adjoining magnetic shells to hold the shells in assembled position within the tubular housing, wherein each spring element has a substantially smooth arcuate surface that is substantially level with a radially inner boundary of the magnetic shells.
4 more elements
Dependencies are inferred from the claim text.