DSP-Based 20-bit Quasi-Absolute Encoder Suits Low Speed

摘要

Ahigh-accuracy 20-bit resolution quasi-absolute encoder with DSP-based signal processing is housed in a dc stepper motor assembly, as shown in Fig. 1. Able to operate in a temperature range between 0℃ to 90℃, it is intended for closed-loop control systems that require high precision and repeatability, as well as reliable performance -even in a high temperature environment. The encoding signals are provided by a 3-channel analog opticalrnencoder and a 1,024-line code disk with an index track. The index marks are located at different intervals. The encoder finds its absolute position by scanning two consecutive indexes.