Suspension Force Rotating Vector Control of Bearingless Doubly Salient Electromagnetic Motor Considering Magnetic Saturation

The cross-coupling between X-axis and Y-axis suspension forces affects the stable suspension of the bearingless doubly salient electromagnetic motor (BDSEM), and magnetic saturation further exacerbates this influence. In this paper, a suspension force rotating vector control method of the BDSEM considering magnetic saturation is proposed. Firstly, the influences of magnetic saturation on the direction of suspension forces are analyzed. Secondly, a mathematical model of suspension forces considering magnetic saturation is derived, and the decoupling of suspension forces is achieved based on coordinate transformation. Thirdly, simulations are conducted to verify the decoupling effectiveness of the suspension force, and the proposed method is compared with the traditional method. Finally, a prototype is developed, and the experimental platform is also established. Experimental results demonstrate the feasibility of the proposed control method.