| 摘要 |
An electromagnetic actuator for a proportional solenoid valve, which actuator has a fixed ferromagnetic core having a longitudinal axis, a plunger movable with respect to the fixed core along the axis between two stroke end positions, a spring for moving the plunger to the first stroke end position, an energizing winding to generate an electromagnetic induction field which produces a force against the bias of the spring and such that it moves the plunger to a equilibrium position between the stroke end positions, and wherein a surface portion of the plunger is increasingly facing a surface portion of the fixed core as the plunger approaches the second stroke end position, so that the electromagnetic induction field has an increasing number of force lines which close in the air gap between the fixed core and the plunger by crossing the first surface portion of the fixed core orthogonally to said axis.
|
