Title:
ENCODER FOR AC SERVO
Document Type and Number:
Japanese Patent JP3045345
Kind Code:
B2
Abstract:
PURPOSE: To achieve high speed responsiveness by multiplexing an origin signal C-phase and a magnetic pole position detection signal U-phase on the basis of the A-phase signal of an encoder during the rotation of a motor.
CONSTITUTION: The position signals A, B of a rotary shaft become the outputs &phiv A, &phiv B of an encoder and the signal A becomes the select signal A of a multiplexer 1 and other signals C, U are selected to be outputted as a signal &phiv C. The signals &phiv A, &phiv B, &phiv C are introduced into a receiving circuit through a cable and the signals &phiv A, &phiv B become reversal ±FB pulses by a differentiation circuit 3. The signal &phiv A becomes the selector signal of an addressable latch 2 and the signal &phiv C is inputted to the data input terminal D of the latch 2 and the opening and closing signal of a gate G is formed from a signal delayed by one clock time from the reversal ±FB pulses. The reversal ±FB pulses are applied to the latch 2 as a signal G through NAND 5 and a J-K flip-flop 4. By this constitution, accurate data signals C, U can be written in a bit address by the stable signal &phiv C.
Inventors:
Shiro Yoshitomi
Application Number:
JP25992091A
Publication Date:
May 29, 2000
Filing Date:
September 10, 1991
Export Citation:
Assignee:
Yaskawa Electric Co., Ltd.
International Classes:
G01D5/244; G01D5/245; G08C19/38; H02P6/08; (IPC1-7): G01D5/245; G01D5/244; G08C19/38; H02P6/08
Domestic Patent References:
| JP6450785A |