Barrier coating for an electric motor rotor assembly
AssigneeBorgWarner Inc.
InventorTyler R. Garrard
Life of this patent
Estimating the term…
Abstract
A rotor assembly configured to be used by an electric motor includes an output shaft; one or more permanent magnets coupled with the output shaft to prevent angular displacement of the permanent magnet(s) relative to the output shaft; one or more composite sleeves positioned concentrically and radially outwardly relative to the permanent magnets; and a barrier coating applied to the composite sleeve that prevents contact with a surface of the sleeve(s) exposed to an ambient environment.
Claims13
A rotor assembly configured to be used by an electric motor, comprising:
- an output shaft;
- a permanent magnet assembly that includes one or more permanent magnets coupled with the output shaft to prevent angular displacement of the permanent magnet(s) relative to the output shaft;
- one or more composite sleeves positioned concentrically and radially outwardly relative to the permanent magnet assembly and at least one end ring;
- and
- a barrier coating, applied to an axial surface axially spaced from the permanent magnet assembly to create a gap between the barrier coating and the permanent magnet assembly, axial outer surfaces of the composite sleeve(s), and radial outer surfaces of the composite sleeve(s) forming a conformal coating that seals the permanent magnet assembly and the composite sleeve, providing a fluid-tight seal that prevents contact between the permanent magnet assembly, axial outer surfaces of the composite sleeve(s), and radial outer surfaces of the composite sleeve(s) with an ambient environment.
A method of manufacturing a rotor assembly, configured to be used by an electric motor, comprising the steps of:
- (a) coupling a permanent magnet assembly that includes one or more permanent magnets to an output shaft;
- (b) assembling one or more composite sleeves positioned concentrically and radially outwardly relative to the permanent magnet assembly and at least one end ring;
- and
- (c) applying a barrier coating to an axial surface axially spaced from the permanent magnet assembly to create a gap between the barrier coating and the permanent magnet assembly, axial outer surfaces of the composite sleeve(s), and radial outer surfaces of the composite sleeve(s) forming a conformal coating that seals the permanent magnet assembly and the composite sleeve, providing a fluid-tight seal that prevents contact between the permanent magnet assembly, axial outer surfaces of the composite sleeve(s), and radial outer surfaces of the composite sleeve(s) with an ambient environment.
Dependencies are inferred from the claim text.