Development and Research of Miniature High Precision Modular Rotary Encoder Kit Based on Dual Optical Sensors

Open type modular rotary encoders are the most suitable choice for applications with limited installation space. The non-contact operating principle and bearing-free mechanical construction allow to design a compact, small size and lightweight angular position measurement device. However, the mounting and adjustment of the encoder have a significant effect on the accuracy that might be achieved. The runout of the measured shaft and the mounting eccentricity of the circular scale are important, because they cause and constitute the largest part of the error. In this work, the development of a miniature high-precision modular encoder kit is presented. It is based on the operation of combined dual optical sensors. The performed experimental research shows the effectiveness of the developed device and its ability to reduce mechanical installation errors by up to 99 percent.