Workpiece-carrier spindle assembly having magnetic bearings, and a device implementing such an assembly for a very high precision machine tool
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United States of America Patent
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Dec 11, 1990
Grant Date -
N/A
app pub date -
Aug 31, 1988
filing date -
Nov 13, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The workpiece-carrier spindle assembly comprises a stator (10) mounted on a slide (202), a spindle (50) supported by active magnetic bearings and rotated by an external electric motor (2) connected to the stator via a coupling (3) which filters the mechanical disturbances due to the excentricity of the motor, and a chuck (5) fixed to the spindle (50). Additional means for detecting movements of the spindle assembly slide (202) include, in the servo-control plane of each of the radial beraings, two position detectors (216, 218: 215, 217) fixed to the stator (10) and facing two plane reference surfaces (211, 212) disposed parallel to the direction of slide displacement and delivering signals which are applied to means for selectively modifying the electric reference voltages applied to the servo-control loops of the magnetic bearings. The spindle assembly is applicable to machine tools for providing optical-quality machining.
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