Moving-coil electromagnetic actuator, particularly for a control valve, with resilient element incorporated in the coil
First Claim
1. An electromagnetic actuator device, particularly for a valve for controlling the injection of fuel or fuel oil, comprising:
- a fixed permanent magnetic core, and an electrical control winding which is disposed in the magnetic field generated by the core and is movable relative to the core when an electrical current flows through the winding, in which the winding is coupled to a movable member actuable by the device, in a manner such as to bring about movement of the movable member between a rest position and at least one operative position, wherein the winding is arranged to act on the movable member by exerting a resilient force which can hold the member in the rest position or return the member to the rest position, in the absence of electrical current and wherein the winding has a plurality of coaxial turns arranged to form a helical configuration having a first, fixed end portion and a second, free end portion coupled to the movable member, the turns being able to move apart or towards one another in dependence on the direction of flow of the current so as to move the free end portion away from or towards the fixed portion, bringing about an overall resilient deformation of the winding.
1 Assignment
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Accused Products
Abstract
An electromagnetic actuator, particularly for a valve for controlling the injection of fuel or fuel oil is described and comprises:
a fixed permanent magnetic core, and
an electrical control winding which is disposed in the magnetic field generated by the core and is movable relative to the core when an electrical current flows through the winding,
in which the winding is intended to be connected to a movable member actuable by the device, in a manner such as to bring about movement of the movable member between a rest position and at least one operative position.
The winding is also arranged to act on the movable member by exerting a resilient force which can hold the member in the rest position or return the member to the rest position.
5 Citations
12 Claims
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1. An electromagnetic actuator device, particularly for a valve for controlling the injection of fuel or fuel oil, comprising:
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a fixed permanent magnetic core, and an electrical control winding which is disposed in the magnetic field generated by the core and is movable relative to the core when an electrical current flows through the winding, in which the winding is coupled to a movable member actuable by the device, in a manner such as to bring about movement of the movable member between a rest position and at least one operative position, wherein the winding is arranged to act on the movable member by exerting a resilient force which can hold the member in the rest position or return the member to the rest position, in the absence of electrical current and wherein the winding has a plurality of coaxial turns arranged to form a helical configuration having a first, fixed end portion and a second, free end portion coupled to the movable member, the turns being able to move apart or towards one another in dependence on the direction of flow of the current so as to move the free end portion away from or towards the fixed portion, bringing about an overall resilient deformation of the winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device according to claim wherein the control circuit comprises a circuit for detecting the position of the movable member, which circuit can detect the back electromotive force present in the winding and due to its movement.
Specification