WORKPIECE-HOLDER SPINDLE WITH MAGNETIC BEARINGS AND DEVICES FOR IMPLEMENTING SUCH SPINDLE FOR VERY HIGH PRECISION MACHINE-TOOL

摘要

the pin includes a body of work holder pin (10) mounted on a slide (202), a rotor (50) carried by the spindle and resulted in active magnetic bearing rotation from the electric motor (2) is connected to the external rotor (3) by a coupling, the disturbance filter s mechanical from the eccentricity of the engine, and a mandrel (5) attached to the rotor (50).additional means for detecting movement of the slide pin (202) include the subjugation of two sensors each level radial position (216, 218, 215, 217) integral with the body of the pin (1) which is placed in the light of two flat surfaces of ref standard (211, 212) arranged parallel to the direction of movement of the slide (202).and provide signals which are applied to means for selective modification of reference voltages of the control loops of the magnetic bearings. application in particular to machine tools with the production cells of optical quality.