“…Direct Drive Actuator (DDA), which has such good features as high-frequency response, large flow highpower density and excellent anti-contamination characteristics, is extensively adopted in the research and application fields of modern industrial automation, military, chemical industry, aviation and aerospace, etc (Jin et al, 2006). Traditionally, DDA is actualized by hydraulic drive with complex mechanical transmission mechanism, which causes complexity in mechanical structure, bulkiness in volume, slow responses, low positioning precision and dynamic performance (Buchnik and Rabinovici, 2004).…”