Structure Design and Performance Analysis of Linear Actuator for Active Suspension

Abstract In view of the high energy consumption and low power density of the pneumatic-hydraulic active suspension actuator,a type of permanent magnet linear actuator with high electromagnetic thrust and low ripple is designed.An analytical analysis is conducted on the radial magnetic field of air gap in actuator by using separated variable method based on the scalar quantity magnet in cylindrical coordinate,and its finite element model built verified.The characteristics of actuator are studied in terms of electromagnetic thrust, its fluctuation and its peak time. The results show that electromagnetic thrust has a close to linear relationship with input current, meanwhile, its fluctuation increases with the rise in electromagnetic thrust.