Vehicular brushless AC generator and exciting-coil bobbin unit therefor
AssigneeMitsubishi Electric Corporation
InventorHideyuki Hayashi
Life of this patent
Estimating the term…
Abstract
A vehicular brushless AC generator includes: a bobbin disposed surrounding the axial end face of the thick ring portion of the yoke and the outer circumferential surface of the cylindrical portion so that an exciting coil can be wound thereon; a plate extending radially outwardly from an end of the cylindrical portion, for joining the bobbin to the yoke; and a stator disposed outside the rotor retaining an air gap, in which magnetic flux produced by the exciting coil propagates; wherein the bobbin is provided with a thick portion for extending a creeping distance, formed along the outer circumferential edge of the bobbin joined to the yoke.
Claims7
A vehicular brushless AC generator, comprising:
- a rotor fixed to a shaft;
- a yoke, opposed to the rotor via a radially-formed air gap, the yoke comprising a thick ring portion fixed to an inner wall of a bracket for rotatably supporting the shaft, and a cylindrical portion formed in an inner circumferential side on an axial end face of the thick ring portion;
- a bobbin disposed to surround the axial end face of the thick ring portion of the yoke and an outer circumferential surface of the cylindrical portion so that an exciting coil can be wound around the bobbin;
- a plate extending radially outwardly from an end of the cylindrical portion, for joining the bobbin to the yoke;
- and
- a stator disposed outside the rotor, in which magnetic flux produced by the exciting coil propagates;
- wherein
- the bobbin is provided with a thick portion for extending a creeping distance, the thick portion being formed over all of an outer circumferential edge of the bobbin joined to the yoke and between the thick ring portion of the yoke and the bobbin.
An exciting-coil bobbin unit for a vehicular brushless AC generator, comprising:
- a yoke including a thick ring portion fixed to an inner wall of a bracket of the vehicular brushless AC generator and a cylindrical portion formed in an inner circumferential side on an axial end face of the thick ring portion;
- a bobbin disposed to surround the axial end face of the thick ring portion of the yoke and an outer circumferential surface of the cylindrical portion so that an exciting coil of the vehicular brushless AC generator can be wound around the bobbin;
- and
- a plate extending radially outwardly from an end of the cylindrical portion, for joining the bobbin to the yoke;
- wherein the bobbin is provided with a thick portion for extending a creeping distance, the thick portion being formed along an outer circumferential edge joined to the yoke and between the thick ring portion of the yoke and the bobbin.
Dependencies are inferred from the claim text.