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US 4,338,501 AGranted
Extinguishing chamber for an electric arc of the magnetic blow-out type
OwnerErnesto Maggiinventor
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OwnerErnesto Maggiinventor
Estimating the term…
An extinguishing chamber for the electric arc of the magnetic blow-out type, is formed by two symmetrical sections disposed in specular position in relation to a rectilinear or curvilinear axis corresponding approximately to the path of the movable contact of the electric circuit breaker, of which the said extinguishing chamber is a part, and makes use in each section of a constant magnetic field generated by permanent magnets coupled in pairs by means of a yoke of metallic material having a good magnetic permeability and apt to conduct the magnetic return flux generated by the same pairs of permanent magnets externally to the said section. Such field forces said arc to go through a slit delimited by electrically insulating refractory walls, provided in the central part of each section. In each of said sections, in addition to said constant magnetic field, also a supplementary variable magnetic field is caused to develop, said supplementary variable magnetic field having the same direction of the constant field and being generated by one or more electrically insulated windings wound around an additional yoke. The arc during its movement inside the slit of the section concerned, produced by the constant magnetic field, skims over properly shaped connection horns arranged inside said slit and forming the ends of said windings.
Extinguishing chamber for the electric arc of the magnetic blow-out type, comprising two symmetrical sections disposed in specular position in relation to an axis corresponding approximately to the path of the movable contact of the electric current circuit breaker, each section having a first yoke of metallic material of good magnetic permeability, permanent magnets coupled in pairs to said yoke to generate a constant magnetic field, said yoke adapted to conduct the magnetic return flux generated by the pairs of permanent magnets externally to said section, electrically insulating refractory walls positioned within each section defining a slit through which the arc passes, a second yoke within each section, electrically insulated windings wound around said second yoke and having connection horns at the end thereof properly shaped and arranged inside said slit to generate a supplementary variable magnetic field having the same direction as the constant field, said windings being run through by unidirectional currents proportional to the current to be interrupted and derived from the electric interruption arc itself when this latter, during its movement inside the slit of the section it occupies, produced by the constant magnetic field, skims over said properly shaped connection horns arranged inside said slit.
Dependencies are inferred from the claim text.