Magnetic core assemblies with adjustable reluctance as a function of temperature
AssigneeU.S. Philips Corporation
InventorClive Victor Newcomb
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Abstract
A metal strip on a magnetic core body, provided with an air gap, for a coil means, is connected to a surface of the magnetic material such that an assembly similar to a bimetal is formed. Variations in temperature then cause variations of the length of the air gap.
Claims10
A core body for a coil means, comprising a core including two core members composed of ferromagnetic material which are fixed together so that an air gap is defined between two surfaces of the core members, a non-magnetic member comprising a thin metal plate having a temperature coefficient of expansion which differs from that of the ferromagnetic core material, said non-magnetic member being held in intimate contact with a surface of the core and located outside of the main flux path of the core body and arranged such that the resulting different coefficients of expansion cause a variation of the length of said air gap with temperature to thereby adjust the reluctance of the core as a function of the temperature.
An inductor comprising first and second core members composed of ferromagnetic material having a temperature coefficient of expansion, said core members being disposed in axial alignment and fixed together so as to define a magnetic circuit including an air gap between two opposed surfaces of the core members, a winding coupled to at least one of said core members, a nommagnetic member comprising a thin plate having a different temperature coefficient of expansion than that of the ferromagnetic core material, and means for fixing said thin plate in intimate contact with a surface of at least one core member so that the different temperature coefficients of expansion of the core material and the plate material cause the length of said air gap to vary with temperature and thereby adjust the core reluctance as a function of temperature.
Dependencies are inferred from the claim text.