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US 4,382,243 AGranted
Electromagnetic positioning device with piezo-electric control
AssigneeRobert Bosch GmbH
InventorsRudolf Babitzka, Walter Beck
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsRudolf Babitzka, Walter Beck
Estimating the term…
A piezo-electric control device is used to restrain movement of the armature of an electromagnet until the current through the exciter winding of the electromagnet has reached almost the maximum value. This causes the force applied to the armature to be the maximum force from the start of movement, so that the overall time required for movement of the armature from its starting to its end position is substantially decreased. Specifically, the piezo-electric control device is a column of discs having an axis perpendicular to the axis of movement of the armature. When electrical energy is applied to the column it expands in the axial direction causing a locking member mounted on its end to engage a stop member which is part of the armature. The locking member can either push the stop member against a further rigid stop or two columns can be used to clamp the stop member between them.
Apparatus for preventing movement of an armature in an electromagnetic system comprising a first means (6) for applying a force in a predetermined direction to said armature and electromagnetic means (1,2,3) for applying a force to said armature to a second direction opposite said predetermined direction, said apparatus comprising
Positioning device comprising
Dependencies are inferred from the claim text.