Title:
SPEED CONTROLLER
Document Type and Number:
WIPO Patent Application WO/1988/004493
Kind Code:
A1
Abstract:
A speed controller wherein feedback data necessary for controlling the speed of a servo-motor are received from a pulse coder in a discrete data form and are digitally processed by a microprocessor to form a predetermined control command. In sampling the data at a predetermined sampling period so as to cope with the processing by the microprocessor, the lag element at a moment when the data is received by the processor as a speed data makes the control of servo motor inacurrate. Therefore, a detecting signal forming unit (5) processes the discrete count data as the sum of the count data that are divided by an integer of a sampling period in synchronism with the sampling period, and sends to a speed processing block (3b) the speed data as the latest speed data necessary for processing at a predetermined sampling period, whereby the effect of the lag element is minimized, thus enabling the microprocessor to fully exhibit its ability to accurately control the speed.
Inventors:
KURAKAKE MITSUO (JP)
SAKAMOTO KEIJI (JP)
SAKAMOTO KEIJI (JP)
Application Number:
PCT/JP1987/000966
Publication Date:
June 16, 1988
Filing Date:
December 11, 1987
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
H02P29/00; G05B19/23; G05B19/414; H02P5/00; (IPC1-7): H02P5/00; G05D3/12
Foreign References:
| JPH06148011A | 1994-05-27 |
Other References:
See also references of EP 0292573A4
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