Rotary apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkira Takara, Toru Nakagawa
Life of this patent
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Abstract
A rotary apparatus includes a rotary spindle, a front end portion of which projects from a shell to an outside thereof and which is supported by magnetic force while the spindle is rotating, a working tool being mountable on the front end portion of the spindle. A first sensor is provided for detecting a position of the front end portion of the spindle in a radial direction thereof and is provided on the front end portion of the shell and in an annular space formed at a periphery of the front end portion of the spindle such that the first sensor occupies a volume of not more than 50% of the annular space. A second sensor is provided, for detecting a position of a rear end portion of the spindle in the radial direction thereof and is provided on the rear end portion of the shell.
Claims5
A rotary apparatus comprising:
- a shell;
- a rotary spindle mounted in said shell and having a front end portion extending to an outside of said shell and adapted to carry a working tool;
- magnetic bearings mounted in said shell and magnetically supporting said rotary spindle when said spindle rotates;
- a first sensor for detecting a radial position of said front end portion of said spindle relative to said shell;
- a second sensor for detecting a radial position of a rear end portion of said spindle relative to said shell;
- wherein said second sensor is mounted in a rear end portion of said shell;
- wherein said first sensor is mounted to a front end portion of said shell outside said shell;
- and
- wherein said first sensor occupies an arc-shaped area extending about less than 50% of a circumference of said spindle.
Dependencies are inferred from the claim text.