Patent ID: 8598757

Claim:
A magnetic-controlled actuator with an auto-locking function for joints of a manipulation arm comprising: an inner-layer stator comprising a core and a winding winded on the core; an inner-layer mover surrounding an outer diameter of the inner-layer stator, and the inner-layer mover formed by circularly installing a plurality of N-pole permanent magnets, a plurality of S-pole permanent magnets, and a plurality of iron materials to form the N-pole permanent magnet, the iron material, the S-pole permanent magnet, and the iron material sequentially; an outer-layer mover surrounding an outer diameter of the inner-layer mover, and the outer-layer mover formed by circularly installing a plurality of N-pole permanent magnets, a plurality of S-pole permanent magnets, and a plurality of iron materials to form the N-pole permanent magnet, the iron material, the S-pole permanent magnet, and the iron material sequentially; an outer-layer stator surrounding an outer diameter of the inner-layer mover and stacking on the outer-layer mover in axial direction, and the outer-layer stator formed by circularly installing a plurality of N-pole permanent magnets, a plurality of S-pole permanent magnets, and a plurality of iron materials to form the N-pole permanent magnet, the iron material, the S-pole permanent magnet, and the iron material sequentially; and a fixed shaft penetrating through the inner-layer stator; wherein a cogging effect, which is produced due to interaction of the permanent magnets between the outer-layer mover and the outer-layer stator; when a polarity relationship between the permanent magnets of the outer-layer mover and the permanent magnets of the outer-layer stator is identical, a magnetic path between the magnet magnets is closed to automatically produce 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; when the polarity relationship is opposite, the magnetic path is half-closed to automatically produce a small cogging torque for the actuator, thus the actuator is controllable.