Design of Digital Control Platform for Magnetic Bearings Based on Multi-core Architecture

Magnetic bearing digital control platform is the core of a magnetic bearing system. In order to solve the problems of an analog magnetic bearing control platform whose parameter adjustment is inconvenient and hardware structure is not easy to change, or a single DSP control platform whose hardware resources are limited and software resources are scarce, a magnetic bearing digital control platform based on AM5728 with a multi-core architecture was designed. Firstly, the overall architecture of the magnetic bearing digital control platform is given to clarify the division of task and requirements of each component. Secondly, the selection of core devices such as data analysis core, AD/DA and FPGA is finished according to the demands. Finally, based on the SOM-TL5728 core board, the FPGA hardware logic development process, DSP side program development and transplantation, and IPC heterogeneous multi-core development process are discussed. The dual DSP core development case shows that the designed multi-core architecture digital platform can fully meet the requirements of the magnetic bearing digital control platform, and has outstanding advantages in terms of computing performance, system stability, and interface scalability. What’s more, it can also be seen that the designed digital control platform based on multi-core architecture can realize its powerful performance potential through software migration and resource allocation.