Active Inertia Extended Resonance Ratio Control for Permanent Magnetic Coupling Transmission System

Permanent magnetic coupling (PMC) has the advantages of high sealing and noncontact transmission, but due to the inherent features of magnetic coupling, the speed oscillation caused by transmitted torque fluctuation limits the use of PMCs in the industry. Accordingly, this article proposes the active inertia extended resonance ratio control (AI-ERRC) method to suppress speed oscillation. First, the principle of speed oscillation and stiffness coefficient variation is analyzed based on PMC torque characteristics. And the difference between PMC and traditional elastic systems is revealed. Next, while ensuring satisfactory closed-loop performance, an active inertia feedback loop and the corresponding forward path parallel controller are designed to improve anti-disturbance. Then, performance evaluations are established among AI-ERRC and other traditional methods, AI-ERRC exhibits better oscillation suppression ability and overcomes the tradeoff problem among different performance specifications. Finally, the feasibility and effectiveness of the proposed method are verified in a PMC test rig.