| 摘要 |
The rotor and armature of an electromagnetic clutch are formed with multiple regions of high magnetic reluctance defined by slots which are shaped and located such that the radial relation between the slots of the rotor and the slots of the armature changes as one member rotates relative to the other. As a result, the flux density across the air gap between the rotor and the armature varies when the armature slips relative to the rotor during initial engagement of the two. This lowers the average torque transmitted by the rotor to the armature and allows the clutch to engage gradually or with a soft-start before building up to full torque.
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