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US 4,853,567 AGranted
Direct drive motor
AssigneeYokogawa Electric Corporation
InventorsYasuhiko Muramatsu, Susumu Ohta, Toshiyuku Takagi, Haruo Higuchi, Mitsuhiro Nikaido
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Abstract
A direct drive motor for use with factory automation, wherein the motor is arranged to directly obtain rotary forces without using a final reduction gear. The direct drive motor has an inner stator, an outer rotor disposed outside the inner stator with a slight air gap formed therebetween, a cylindrical rotor hub to which the outer rotor hub is internally fixed and a bearing provided in an inner cylindrical portion of the rotor hub for rotatably supporting the rotor hub.
Claims4
A direct drive motor comprising
- an inner stator having two pairs of magnetic substances, permanent magnets interposed therebetween and exciting coils;
- a cylindrical housing to which said inner stator is fixed;
- an outer rotor disposed outside said inner stator with a slight air gap formed therebetween;
- a cylindrical rotor hub having its inside portion to which said outer rotor is fixed;
- and
- a cross roller bearing, provided in an inner cylindrical portion of said rotor hub, for rotatably supporting said rotor hub,
- said rotor hub being rotatably supported on said cross roller bearing within said inner cylindrical portion of said rotor hub on the basis of cantilever structure;
- said inner stator is fixed to said cylindrical housing, said bearing is fastened with a clamp ring between said rotor hub and said housing, wherein said clamp ring includes notches for absorbing forces acting on said clamp ring.
5 more elements
Dependencies are inferred from the claim text.