Title:
SERVO CONTROL APPARATUS
Document Type and Number:
WIPO Patent Application WO/2011/077789
Kind Code:
A1
Abstract:
A control unit (100) conducts a servo control of a table (02), which is the load, by conducting a feedback control of a servomotor (40). An inverse characteristic model (300) conducts a feedforward compensation control, by obtaining a speed compensation signal (V300) that compensates the dynamic errors of the mechanical system. When the rigidity of a screw section (31) of a ball screw (30) along the axial direction changes, a rigidity-change compensation unit (400) changes the rigidity value of the screw section along the axial direction that is included in the compensation control transfer function of the inverse characteristic model (300), in accordance with the change in rigidity. Thus, the servo control apparatus compensates such changes in rigidity and conducts an accurate servo control of the position of the table (02), even when the ball screw (30) of the feeding mechanism expands or contracts due to secular change or change in temperature, and rigidity along the axial direction changes.
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Inventors:
KURAMOTO HIROHISA (JP)
Application Number:
PCT/JP2010/065464
Publication Date:
June 30, 2011
Filing Date:
September 09, 2010
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
KURAMOTO HIROHISA (JP)
KURAMOTO HIROHISA (JP)
International Classes:
G05D3/12; H02P29/00
Foreign References:
| JP2009201169A | 2009-09-03 | |||
| JP2007219689A | 2007-08-30 | |||
| JP2009061557A | 2009-03-26 | |||
| JP2004322283A | 2004-11-18 |
Attorney, Agent or Firm:
MITSUISHI Toshiro et al. (JP)
Toshiro Mitsuishi (JP)
Toshiro Mitsuishi (JP)
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