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US 2003/0111922 A1Published application
Electric motor
AssigneeJohnson Electric S.A.
InventorJames Ching Sik Lau
Life of this patent
Estimating the term…
Abstract
A miniature PMDC motor 10 has a permanent magnet stator comprising two arcuate ceramic magnets 20 fitted to a can-like housing 11 and circumferentially separated by interdisposed rubber magnets 21 wedging or nipping the ceramic magnets 20 in place within the housing 11 without the use of circumferential magnet stops formed in the side of the housing.
Claims10
A miniature electric motor comprising:
- a wound rotor;
- a permanent magnet stator disposed about the rotor;
- a housing supporting the permanent magnet stator;
- wherein the permanent magnet stator comprises at least two arcuate ceramic magnets separated circumferentially by rubber magnets.
1 more element
A method of making a miniature electric motor, comprising the steps of:
- taking a deep drawn cylindrical housing and inserting two ceramic arcuate magnets and locating the ceramic magnets circumferentially spaced against an inner circumferential wall of the housing,
- inserting rubber magnets into the housing and placing the rubber magnets against the inner circumferential wall of the housing to fill the circumferential gaps between the ceramic magnets,
- mounting a wound rotor into the housing confronting the magnets,
- closing the housing with an end cap, and
- applying a strong magnetic field across the housing to charge the magnets.
2 more elements
Dependencies are inferred from the claim text.