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Patent Searching and Data


Title:
SPINDLE UNIT AND CUTTING DEVICE
Document Type and Number:
Japanese Patent JP2013215831
Kind Code:
A
Abstract:

To provide a spindle unit capable of braking a spindle according to the weights of a mount and a rotary tool.

A spindle unit 26 comprises a rotary tool mounted in a mount, an electric motor 58 driving a spindle 26, and a motor driver. The motor driver 26 includes a plurality of resistors 70 converting the rotary energy of the motor 58 to thermal energy to consume the same and stopping the spindle 26. Force for stopping the spindle 26 is increased by increasing power consumed by the resisters 70 by selectively connecting the resistors 70 to a stator coil 62 when the total weight of the mount and the rotary tool is large, the force for stopping the rotating spindle is decreased by reducing the power consumed by the resistors 70 by selectively connecting the resistors 70 to the stator coil 62 when the total weight is small, thereby the spindle 26 is stopped in a predetermined time by a proper deceleration of rotational speeds.


Inventors:
KAWAKAMI GOJI
TAKAHASHI MASAYOSHI
Application Number:
JP2012087451A
Publication Date:
October 24, 2013
Filing Date:
April 06, 2012
Export Citation:
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Assignee:
DISCO CORP
International Classes:
B23Q5/10; B24B47/12; H02P3/22; H01L21/301
Domestic Patent References:
JP2006237332A2006-09-07
JPH10295091A1998-11-04
JP2009164422A2009-07-23
JP2006263894A2006-10-05
JPH0713269A1995-01-17
Foreign References:
US5063319A1991-11-05
US2507918A1950-05-16
US20110097852A12011-04-28
Attorney, Agent or Firm:
Akira Matsumoto
Hiroshi Oue