Design and Analysis of Linear Electromagnetic Actuator for Automobile Active Suspension System

The article presents a design topology of an electromagnetic actuator using Finite Element Analysis primarily for applications related to vibration control and linear motion in automobile suspension systems. This proposed topology features an innovative arrangement of three-phase windings and permanent magnet arrays to reduce ripple, enhance average output force, and improve efficiency and force density by optimizing the coil arrays and their sequence around the actuator axis. Geometrical modifications in the translator and stator iron, including flux guides and notches, efficiently utilize space and guide flux lines to prevent leakage and reduce the actuator's mass. Additionally, the shapes of winding slots and permanent magnet shields are optimized for better performance. The active suspension system with the designed actuator is analysed using the full vehicle model with 7 degrees of freedom. The designed electromagnetic actuator with look-ahead preview control can replace the vehicle's pneumatic or hydraulic, or conventional passive suspension system.