A Novel Miniature Absolute Metal Rotary Encoder Based on Single-track Periodic Gray Code

In order to improve the resolution and enhance the impact resistance and vibration resistance of encoders, a novel absolute metal rotary encoder based on Single-track Periodic Gray Code is presented. The configuration and working principle of the encoder is introduced, and then the metal code disc which can realize full scale absolute encoding on one single track and its corresponding metal slit disc are proposed. Finally, the data acquisition and processing system based on FPGA of encoder is presented. The resolution of the encoder can reach 5.27" through electronic subdivision and calibration between the precision code and the coarse code with its volume only Φ 48×40mm. The encoder has some advantages such as small volume, low cost, high resolution and strong impact resistance.