A Novel Rotational Speed Standard Device Based on an AMB Force Compensation System

Rotational speed standard devices are used to calibrate the rotational speed/angular velocity of various sensors (e.g., micro-electromechanical systems gyroscopes, wheel speed sensors, and resolvers) by providing a reference rotational speed. However, the unbalanced vibration force induced by rotor unbalance, and the magnetic bias force not only degrade the rotational speed control accuracy but also damage the mechanical bearings of the standard device, shortening its service life. Therefore, it is of great significance to suppress the unbalanced vibration force for improving the device's performance and reliability. Aiming to address the limitations of traditional standard devices, this article proposes a novel rotational speed standard device integrating unbalanced force real-time monitoring and active magnetic bearings force compensation. First, the structure of the new standard device is introduced, which uses the force sensors to monitor the unbalanced force and compensates it through an active magnetic bearings (AMBs) system. Accordingly, a current feedback closed-loop with parameter optimization and a PI controller is designed for precise force compensation. Finally, the experimental results verify the feasibility of the proposed AMB force compensation scheme.