| 摘要 |
: An electromagnetic actuator has a tubular stator with at least two opposed, external pole pieces carrying energising windings, and a permanent magnet rotor inside the stator and rotatable about the major axis of the stator, the rotor having at least two oppositely-directed permanent magnets extending axially of the rotor and in closely spaced relation to the stator, said magnet each occupying less than 180.degree. of the circumference of the rotor, the leading and/or trailing edge of each magnet being tapered and/or chamfered.
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