Research on Subdivision System of Sin-Cos Encoder Based on Zero Phase Bandpass Filter

Area of Science:

• * Engineering
• * Signal Processing
• * Robotics

Background:

• * High-speed encoders are crucial for precise motion control in industrial applications.
• * Traditional Sin-Cos Encoder (SCE) systems can suffer from noise and limited subdivision accuracy.
• * Accurate angle measurement is essential for the performance of industrial robots.

Purpose of the Study:

• * To design and validate a novel high-precision subdivision system for SCEs.
• * To improve the accuracy and stability of encoder angle calculations.
• * To reduce noise in analog encoder signals using advanced filtering techniques.

Main Methods:

• * Development of a subdivision system utilizing a zero phase bandpass filter.
• * Acquisition of analog encoder signals via a high-speed data acquisition system (DAS).
• * Implementation of software subdivision techniques: Analog Pulse Counter (APC) and Arc Tangent Subdivision (ATS).

Main Results:

• * The zero phase bandpass filter effectively eliminated noise from digital signals.
• * Both APC and ATS methods demonstrated improved encoder angle calculation accuracy.
• * The system achieved arc-second precision, verified with simulated and real-world data.

Conclusions:

• * The proposed high-precision subdivision system significantly enhances SCE angle measurement accuracy.
• * The system offers a cost-effective solution for improving encoder performance in industrial robots.
• * The combination of filtering and software techniques provides a robust method for precise angle determination.