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US 2002/0153783 A1Published application
Motor
AssigneeJohnson Electric S.A.
InventorKevin King Wai Lau
Life of this patent
Estimating the term…
Abstract
A double insulated rotor (10) for an electric motor has a rotor core (14) fitted to a shaft (12) by way of an insulating sleeve (24) moulded to the shaft (12).
Claims15
A double insulated rotor for an electric motor comprising:
- a shaft;
- an insulating sleeve moulded to the shaft;
- a stack of stamped laminations forming a rotor core, the rotor core having a plurality of salient poles and a central aperture receiving the shaft and a core section of the insulating sleeve;
- a commutator mounted on the shaft;
- windings wound around the salient poles and terminated on terminals of the commutator, wherein:
- the insulating sleeve is injection moulded onto the shaft;
- the core section of the sleeve has a substantially polygonal outer cross-section where it contacts the rotor core;
- and
- the aperture in the rotor core has a corresponding profile adapted to receive the shaft and insulating sleeve as a press fit.
6 more elements
A method of making a double insulated rotor for an electric motor, comprising the steps of:
- injection moulding an insulating sleeve onto a shaft;
- stacking a plurality of stamped motor laminations to form a rotor core having a plurality of poles and a central aperture;
- pressing the shaft and sleeve through the central aperture of the rotor core to position the rotor core onto a core section of the insulating sleeve;
- mounting a commutator onto the sleeve adjacent the rotor core;
- winding coils about the poles of the rotor core and connecting the coils to terminals of the commutator,
- wherein the core section is formed with a substantially polygonal cross-section and the central aperture is formed with a corresponding profile.
3 more elements
Dependencies are inferred from the claim text.