| 摘要 |
The control includes an electromagnetic coil having a core member disposed adjacent one axial end. An armature is provided within the electromagnetic coil for selective axial movement in response to the energisation and de-energisation of the electromagnetic coil. The armature is connected to an actuator for the wrap spring clutch such that movement of the armature controls the engagement and disengagement thereof. The core member and the armature are both formed from relatively soft, magnetically permeable materials. A flux breaker is disposed within the electromagnetic coil between one axial end of the armature and the core member. The flux breaker is formed from a relatively hard, non-magnetically permeable material, such as stainless steel. The flux breaker prevents the armature from contacting the core member when attracted thereto by energisation of the electromagnetic coil. The flux breaker is provided for minimising the adverse effects of residual magnetism on the operation of a solenoid.
|
