Investigation of Gas Separation Force Balancing EM Mechanism for Micro-scroll Machines

Scroll machines are highly competitive in the compressor field due to direct drive structure and excellent pressure stabilization. However, they usually have difficulty in achieving good dynamic sealing. For this consideration, this thesis proposes a suction structure with the aid of permanent magnets to overcome the challenge in maintaining stable axial gas separation force and minimum horizontal force simultaneously.Two electromagnetic (EM) mechanisms are proposed and compared at first. The modelling results indicate the ring-shape permanent-magnet EM mechanism as a better solution. The performance of this mechanism is investigated parametrically, pointing out the more important parameters for the optimization design. Based on these efforts, the optimal design is achieved with the adoption of the genetic algorithm.