Electromagnetic actuator and circuit breaker comprising such an actuator
AssigneeSchneider Electric Industries SAS
InventorPhilippe Schuster
Life of this patent
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Abstract
An electromagnetic actuator including a magnetic housing, a coil that is rigidly connected to the housing and is capable of being connected to an electric circuit, a magnetic core that is arranged in the coil and can move along a central axis defined by the coil and according to the strength of the current flowing in the coil, and a shunt that is arranged in the coil and includes a magnetocaloric material the magnetisation of which is temperature-dependent. The shunt is arranged in the coil along the central axis along a length so as to create an air gap between the shunt and the magnetic core. The actuator further includes a device for attaching the shunt to the housing that are designed to adjust the length.
Claims12
An electromagnetic actuator configured to be disposed in a circuit breaker, comprising:
- a magnetic field frame,
- a coil secured to the field frame and which is configured to connect to a power line of an electrical circuit,
- a magnetic core arranged in the coil and that can move, along a central axis defined by the coil as a function of the intensity of the current flowing in the coil, wherein the magnetic core is configured to be coupled to a movable structure which is configured to open and close the electric circuit;
- and
- a shunt device arranged in the coil and comprising a magnetocaloric material, the magnetization of which is a function of the temperature,
- wherein the shunt device is arranged in the coil for a length, along the central axis, in such a way as to form an air gap between the shunt device and the magnetic core, the actuator further comprising means for fixing the shunt device to the field frame, designed to set this length, wherein a reluctance of the shunt device is dependent on the length such that the trigger threshold of the circuit breaker is dependent upon the length.
An electromagnetic actuator, comprising:
- a magnetic field frame,
- a coil secured to the field frame and which can be linked to an electrical circuit,
- a magnetic core arranged in the coil and that can move, along a central axis defined by the coil as a function of the intensity of the current flowing in the coil;
- and
- a shunt device arranged in the coil and comprising a magnetocaloric material, the magnetization of which is a function of the temperature,
- wherein the shunt device is arranged in the coil for a length, along the central axis, in such a way as to form an air gap between the shunt device and the magnetic core, the actuator further comprising means for fixing the shunt device to the field frame, designed to set this length,
- wherein a spring is interposed between the shunt device and the magnetic core, and
- the shunt device is provided with a polar part, arranged between the spring and a part of the shunt device, consisting of the magnetocaloric material.
An electromagnetic actuator, comprising:
- a magnetic field frame,
- a coil secured to the field frame and which can be linked to an electrical circuit,
- a magnetic core arranged in the coil and that can move, along a central axis defined by the coil as a function of the intensity of the current flowing in the coil;
- and
- a shunt device arranged in the coil and comprising a magnetocaloric material, the magnetization of which is a function of the temperature,
- wherein the shunt device is arranged in the coil for a length, along the central axis, in such a way as to form an air gap between the shunt device and the magnetic core, the actuator further comprising means for fixing the shunt device to the field frame, designed to set this length,
- wherein the magnetocaloric material is an alloy of nickel, cobalt, manganese and a fourth element chosen among aluminum, indium, antimony and tin.
Dependencies are inferred from the claim text.