Magnetic-controlled actuator with auto-locking function for joints of manipulation arm

Abstract

A magnetic-controlled actuator () with an auto-locking function for joints of a manipulation arm mainly includes an inner-layer stator (), an inner-layer mover (), an outer-layer mover (), an outer-layer stator (), and a fixing shaft (). The inner-layer mover (), the outer-layer mover (), and the outer-layer stator () have a plurality of permanent magnets, respectively. The fixed shaft () simultaneously penetrates through the inner-layer stator (), the inner-layer mover (), the outer-layer mover (), and the outer-layer stator () forming a coaxial arrangement. The inner-layer mover () rotates relatively to the inner-layer stator () to output power from the actuator (). Therefore, a cogging effect, which is produced due to interaction of the permanent magnets between the outer-layer mover () and the outer-layer stator (), is automatically produces a high cogging torque for the actuator (). Thus the actuator () provides a sufficient locking force to lock the non-stationary inner-layer mover () when a power failure occurs.