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US 5,783,887 AGranted
Magnetic bearing spindle device for machine tools
AssigneeKoyo Seiko Co., Ltd.
InventorsHirochika Ueyama, Manabu Taniguchi
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AssigneeKoyo Seiko Co., Ltd.
InventorsHirochika Ueyama, Manabu Taniguchi
Estimating the term…
A magnetic bearing spindle device for machine tools comprises a spindle for mounting a tool element as changeably attached to a forward end thereof, a plurality of controllable magnetic bearings for contactlessly supporting the spindle, an electric motor for rotating the spindle as contactlessly supported by the magnetic bearings, a draw bar inserted through the spindle and axially movable for unclamping and clamping the tool element, state sensor switches for detecting the axial position of the draw bar to detect a state of having no tool element, an unclamping state or a clamping state, and a control unit for controlling the support of the spindle by the magnetic bearings and the rotation of the spindle by the motor based on the result of detection by the switches.
A magnetic bearing spindle device for machine tools which comprises a spindle for mounting a tool element as changeably attached to a forward end thereof, a plurality of controllable magnetic bearings for contactlessly supporting the spindle, rotating drive means for rotating the spindle as contactlessly supported by the magnetic bearings, and a draw bar inserted through the spindle and axially movable for unclamping and clamping the tool element, the spindle device being characterized in that the device comprises a tool state sensor means for detecting the axial position of the draw bar to detect a state of having no tool element, an unclamping state or a clamping state, and control means for controlling the support of the spindle by the magnetic bearings and the rotation of the spindle by the drive means based on the result of detection by the sensor means.
Dependencies are inferred from the claim text.