A high-resolution interpolator for incremental encoders based on the quadrature PLL method

Author

Emura, Takashi ; Wang, Lei

Author_Institution

Dept. of Mechatronics & Precision Eng., Tohoku Univ., Sendai, Japan

Volume

47

Issue

1

fYear

2000

fDate

2/1/2000 12:00:00 AM

Firstpage

84

Lastpage

90

Abstract

This paper presents a new high-resolution interpolator for incremental encoders based on the quadrature phase-locked loop method proposed by Emura. Until now, this method has been applied to controllers of high-precision servomechanisms and has shown excellent performance. In this paper, the authors apply the method for the first time to an interpolator for incremental encoders. The experimental results show that high-speed interpolation is possible, with a maximum output frequency of 25 MHz-20 times higher than that of conventional interpolators. The interpolator proposed was also tested for noise rejection with a high-speed numerically controlled gear grinding machine, and has shown good noise rejection capability. This paper presents the design of the interpolator and the experimental results

Keywords

analogue-digital conversion; angular measurement; control system synthesis; encoding; grinding; interpolation; machine tools; machining; motion measurement; numerical control; phase locked loops; 25 MHz; control design; control performance; high-resolution interpolator; high-speed interpolation; high-speed numerically controlled gear grinding machine; incremental encoders; noise rejection; noise rejection capability; quadrature PLL method; quadrature phase-locked loop method; Frequency; Gears; Grinding machines; Interpolation; Machine tools; Motion control; Phase detection; Phase locked loops; Servomechanisms; Testing;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/41.824129

Filename

824129