Rotary encoder

Details Rotary encoder Rotary encoder

2006-05-16

2006-05-16

Jeanpierre, Peguy (Department: 2819)

Coded data generation or conversion

Phase or time of phase change

Synchro or resolver signal

C341S015000, C341S116000, C250S231140

Reexamination Certificate

active

07046176

ABSTRACT:
A rotary type encoder is provided with a signal generating portion2for generating a sine wave signal of N periods for each revolution in accordance with the rotation of the shaft4of a motor; a calculation means for obtaining the rotation angle of the shaft4based on the sine wave signal; an EEPROM37being arranged in a manner that the error value of the rotation angle for one revolution of the shaft4thus measured is divided in relation with the N periods to set a plurality of first angle regions i, the angle region almost at the center of the angle region i is divided into plural regions to set second angle regions j, and an error value corresponding to the angle at almost the center of each of the angle regions j is stored therein in correspondence with the rotation angle; and a correction means for reading the error value stored in the EEPROM37in correspondence with the rotation angle to correct the rotation angle.

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