I am writing to discuss about the supporting of absolute encoder. These days I have spent time on investigating different kinds of present BLDC driver product in the market like ODrive and I find that many of them only officially support incremental encoders rather than the absolute ones. Since implementing absolute encoder to the BLDC control loop is not a very hard and new problem, I am wondering about the reason why drivers as ODrive do not come with absolute encoder supporting.
To answer this question, I have investigated many different absolute encoder products, and my explanation is that different absolute encoder product applies different kind of communication solution like PWM, SPI, etc. Even for two different encoder products both using SPI, the transmitting data frame can be quite different. Whereas, this situation does not exist for incremental encoders for their signal output are quite standardized. Therefore, due to all kings of communication solutions between absolute encoder products and driver, it is nearly impossible for the driver creator to cover all the cases.
Is my above analysis reasonable? I hope to hear your opinions. Since BLDC motors become more and more important in robotics fields, a start-up process without any encoder calibration or index finding is more meaningful. Don’t you think so?
Thank you for your time and discussion.