| 摘要 |
<p>A permanent magnet brushless torque actuator is comprised of an electromagnetic core capable of generating an elongated toroidally shaped magnet flux field when energized. Outside the generally cylindrical coil (58) is an outer housing (42, 44, 46) with upper and lower end plates (44, 46) at each end. Mounted to the end plates (44, 46) and extending towards each other are stator pole pieces (48, 50) separated from its opposing pole piece by an air gap (66, 68). A permanent magnet rotor (62) is disposed in the air gap (66, 68) and mounted on a shaft (52) which in turn is rotatably mounted in each of the end plates (44, 46). The permanent magnet rotor (62) comprises at least two permanent magnets (54, 56), each covering an arcuate portion of the rotor (62) and having opposite polarities. Energization of the coil (58) with current in one direction magnetizes the pole pieces (48, 50) such that each of the two pole pieces (48, 50) attracts one of the magnets (54, 56) of the rotor (62) and repels the other magnet (54, 56) of the rotor (62) resulting in a torque generated by the output shaft (52). Reversal of the current flow results in a reversal of the torque and rotation of the rotor (62) in the opposite direction. <IMAGE></p> |
