POSITION CONTROLLER

Title:

POSITION CONTROLLER

Document Type and Number:

WIPO Patent Application WO/1999/001927

Kind Code:

A1

Abstract:

The center (O') of an object (2a) to be detected by a position detector is attached to a rotary shaft with an eccentricity (d) from a rotation center (O). When the rotary shaft is turned at a certain speed, accurate positions can be detected by a sensor (2b) at 0° and 180° but positions P1' and P3' are erroneously detected at 90° and 270° where the true positions are P1 and P3, resulting in that the detected positions show undulation as shown in Fig. 3B. The peak value of the undulation and the rotation angle generated by the peak value are found. The eccentricity (d) is found from the peak value, and the detection error of the command position (angle) is found from the eccentricity (d) and the angle generated by the peak value. The command position is corrected by the detection error and outputted to a motor.

Inventors:

SAKAMOTO KEIJI (JP)
OKUDA KANEMASA (JP)
TANIGUCHI MITSUYUKI (JP)
AKIYAMA TAKAHIRO (JP)
TOKUOKA HIROSHI (JP)
INOUE TADASHI (JP)

Application Number:

PCT/JP1998/002965

Publication Date:

January 14, 1999

Filing Date:

July 01, 1998

Export Citation:

Click for automatic bibliography generation Help

Assignee:

FANUC LTD (JP)
SAKAMOTO KEIJI (JP)
OKUDA KANEMASA (JP)
TANIGUCHI MITSUYUKI (JP)
AKIYAMA TAKAHIRO (JP)
TOKUOKA HIROSHI (JP)
INOUE TADASHI (JP)

International Classes:

G01D5/245; G01D5/244; G05B19/19; G05B19/402; G05B19/404; G05D3/00; H02P29/00; (IPC1-7): H02P5/00; G05D3/12

Foreign References:

JPH01270784A	1989-10-30
JPH06327278A	1994-11-25

Other References: