School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China;
School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China;
Nanjin Canneng Electric Power Automation Co. Ltd. Nanjing 211199 China;
School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China;
Linear actuator; magnetic screw; high force; permanent magnet; finite-element analysis;