| 摘要 |
An electromagnetic actuator includes a core structure defining a central pole piece and an annular pole piece surrounding the central pole piece in spaced relationship. A winding is provided which when energized causes the pole faces of the pole pieces to assume opposite magnetic polarity to draw an armature towards the pole faces. A further winding is located about the annular pole piece and an annular core component surrounds the annular pole piece in spaced relationship and extends beyond the pole faces to form a radial air gap 23 with the armature.
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