Title:
SPINDLE POSITIONING METHOD
Document Type and Number:
WIPO Patent Application WO/1993/015876
Kind Code:
A1
Abstract:
A main spindle positioning method which makes the most of deceleration of a spindle motor and speeds up a spindle positioning operation. It is assumed that the spindle motor is running under speed control. In response to a command for a stop at a given position, the spindle motor is decelerated to a speed N below a maximum rotating speed N1 determining a constant torque region on the basis of the speed control (Step S1), and the speed control is switched to a position control at the position at which the speed N is reached. At this time, a value which takes into consideration the present position at one rotating position of the spindle and a target stop position as an initial position error are set to an error counter (Steps S5 to S11). Thereafter, a position feedback quantity Pf from a position sensor is received by the error counter so as to execute linear acceleration/deceleration control to a final stop position (Step S12) and a speed command Vcmd is determined (Step S13), and a speed loop processing follows.
Inventors:
KONO SHINICHI (JP)
FUKUKURA MASAAKI (JP)
FUKUKURA MASAAKI (JP)
Application Number:
PCT/JP1993/000092
Publication Date:
August 19, 1993
Filing Date:
January 26, 1993
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
B23Q15/26; G05B19/23; G05D3/12; B23Q5/58; (IPC1-7): B23Q15/26; G05D3/00; G05D3/12
Foreign References:
| JPS63273114A | 1988-11-10 | |||
| JPS55154661A | 1980-12-02 |
Other References:
See also references of EP 0580866A4
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