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US 2008/0174203 A1Published application
Motor
AssigneeNidec Corporation
InventorsYusuke Makino, Yoshio Fujii
Life of this patent
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Abstract
In a motor, an upper surface of a flange portion of a shaft is arranged axially below a bottom end surface of a rotor core. A spacer having an axial thickness slightly greater than that of the flange portion is arranged on a radially outer side of the flange portion. A bottom surface of the spacer makes contact with an end plate whose inner circumferential surface has a radius, centered about a central axis, smaller than a radius of the flange portion. The end plate is secured to the rotor core via a fixing member.
Claims19
A motor comprising:
- a shaft arranged concentrically about a central axis;
- a rotor core including an inner circumferential surface affixed to an outer circumferential surface of the shaft;
- at least one rotor magnet retained by the rotor core;
- an end plate arranged at least one end surface of the rotor core in an axial direction, and including an inner circumferential surface opposite to the shaft;
- and
- a fixing member connecting the end plate to the rotor core;
- wherein
- the shaft includes a rotor core fixing portion arranged to secure the rotor core and a flange portion arranged at one end in the axial direction of the rotor core, the flange portion having an outer circumferential surface whose radius centered around the central axis is greater than a radius of an inner circumferential surface of the rotor core fixing portion;
- the radius of the outer circumferential surface of the flange portion is greater than the radius of an inner circumferential surface of the end plate;
- and
- the flange portion is arranged in an axial space between the end plate and the rotor core fixing portion.
8 more elements
A motor comprising:
- a shaft arranged concentrically about a central axis;
- a rotor core including an inner circumferential surface affixed to an outer circumferential surface of the shaft;
- a rotor magnet retained by the rotor core;
- and
- an end plate arranged at least one end surface of the rotor core in an axial direction, and including an inner circumferential surface opposite to the shaft;
- wherein
- the shaft includes a rotor core fixing portion arranged to secure the rotor core and a flange portion arranged at one end in the axial direction of the rotor core, the flange portion having an outer circumferential surface whose radius centered about the central axis is greater than a radius of an inner circumferential surface of the rotor core fixing portion;
- the radius of the outer circumferential surface of the flange portion is greater than the radius of an inner circumferential surface of the end plate;
- and
- the flange portion is arranged in an axial space between the end plate and the rotor core fixing portion.
7 more elements
Dependencies are inferred from the claim text.