Cooper Power Systems, Inc.

Cooper Industries, Inc.

James V White

Gary L Goedde

John F Baranowski

Lawrence M Burrage

Lawrence G Wilson

Donald Stachewicz

Robert M Weier

John Lapp

Gary A Gauger

Alan Paul Yerges

An electrical apparatus, such as a transformer, includes an expandable internal chamber that is nonventing and completely and permanently sealed from the ambient environment. The chamber houses a core and coil assembly or other current-carrying conductor and is completely filled with dielectric fluid having a pressure less than one atmosphere. The enclosure walls are flexible and are permitted to bow inwardly and outwardly as the volume of the dielectric fluid changes due to thermal expansion and contraction. A method of processing the dielectric fluid and filling and sealing the transformer at sub-atmospheric pressure is also disclosed.

Hermetically sealed, non-venting electrical apparatus with dielectric

An apparatus for magnetic annealing of amorphous metal alloy cores. The apparatus includes a fluidized bed for heating the core, a conveyor for transporting the core and immersing the core in the fluidized bed and at least one winding for applying a magnetic field to the core. The apparatus can include a chill bath and/or a second fluidized bed for cooling the core. A chamber can be provided between the two fluidized beds for slow cooling the core by convection and radiation prior to cooling the core at a faster rate in the second fluidized bed.

Apparatus for annealing/magnetic annealing amorphous metal in a

An apparatus and method for structurally restraining and reinforcing an amorphous metal core of an electrical transformer employs an adhesive bonding agent applied to the lamination edges and protective layers of the core followed by adhesion of a woven fabric thereto to form a highly permeable oil/air interface with the lamination edges of the amorphous material, while providing an effective chip containment system thereto. A temporary guide sleeve aids the core and coil lacing operation. A method for breaking performance inhibiting interlaminar bonds between the amorphous layers of the core.

Method of breaking interlaminar bonds of an amorphous metal core

A method of heat treating an amorphous metal alloy by immersing the alloy in a fluidized bed to heat the alloy to a temperature below its recrystallization temperature. The alloy is maintained in the fluidized bed for a time sufficient to reduce internal stresses While minimizing crystal growth and nucleation of crystallites in the alloy. Then, the alloy is removed from the fluidized bed and cooled. A magnetic field can be applied to the alloy before, during or after heating the alloy in the fluidized bed. The magnetic field is applied for a time sufficient to achieve substantial magnetic domain alignment while minimizing crystal growth and nucleation of crystallites in the alloy. The cooling step is effective to maintain the magnetic domain alignment in the alloy. The cooling step can be performed with a chill bath or a fluidized bed which is cooled by a circulating gas such as nitrogen or air. The alloy can be slowly cooled by convection and radiation after it is removed from the first fluidized bed. An apparatus for magnetic annealing of amorphous metal alloy cores. The apparatus includes a fluidized bed for heating the core, a conveyor for transporting the core and immersing the core in the fluidized bed and at least one winding for applying a magnetic field to the core. The apparatus can include a chill bath and/or a second fluidized bed for cooling the core. A chamber can be provided between the two fluidized beds for slow cooling the core by convection and radiation prior to cooling the core at a faster rate in the second fluidized bed.

An apparatus and method for structurally restraining and reinforcing an amorphous metal core of an electrical transformer employs an adhesive bonding agent applied to the lamination edges and protective layers of the core followed by adhesion of a woven fabric thereto to form a highly permeable oil/air interface with the lamination edges of the amorphous material, while providing an effective chip containment system thereto. A temporary guide sleeve aids the core and coil lacing operation. A method for breaking performance inhibiting interlaminar bonds between the amorphous layers of the core is also disclosed.

Amorphous metal transformer core

A transformer core of non-circular cross-section, preferably rectilinear, is formed by successively wrapping individual packets of core strips around a stationary mandrel of non-circular cross-section. Each packet is wrapped by a pair of yieldably biased rollers which follow the contour of the mandrel. As the packet is being wrapped, pressure pads are extended to hold the packet against the mandrel. The pressure pads are momentarily retracted to accommodate return movement of the roller wipers to receive a subsequent packet. The ends of the packet form a joint at the top of the mandrel. The positions of successive packets can be changed to vary the location of the joint in order to form a desired joint pattern.

Apparatus for making a transformer core of non-circular cross-section

A method of heat treating an amorphous metal alloy by immersing the alloy in a fluidized bed to heat the alloy to a temperature below its recrystallization temperature. The alloy is maintained in the fluidized bed for a time sufficient to reduce internal stresses while minimizing crystal growth and nucleation of crystallites in the alloy. Then, the alloy is removed from the fluidized bed and cooled. A magnetic field can be applied to the alloy before, during or after heating the alloy in the fluidized bed. The magnetic field is applied for a time sufficient to achieve substantial magnetic domain alignment while minimizing crystal growth and nucleation of crystallites in the alloy. The cooling step is effective to maintain the magnetic domain alignment in the alloy. The cooling step can be performed with a chill bath or a fluidized bed which is cooled by a circulating gas such as nitrogen or air. The alloy can be slowly cooled by convection and radiation after it is removed from the first fluidized bed.

Growing community of inventors

Waukesha, WI, United States of America

James V White