Abb Inc.

Abb Power Td & Company

Vladimir Segal

Arthur Lanni

Tri D Vu

Leonid Beitelman

Christopher P Curran

Cooling of the electrical coils of an electromagnetic stirrer is effected using a ferrofluid.

Cooling electromagnetic stirrers

There is disclosed a method of making transformer core laminates with bent corners from magnetic strip material having a predetermined thickness and power loss in the manufacture of a low-stress polyhedral core for a power transformer. The method includes mechanically bending corners in each laminate about predetermined bending lines while limiting the zone in each corner where the laminate is subject to plastic deformation to <5 times laminate thickness so that the specific power loss in the transformer core will equal that of the magnetic strip material except within the distance from the bending lines, where the power loss is higher due to plastic deformation of the magnetic strip material.

Method of manufacturing magnetic cores for power transformers

A stacked magnetic transformer core is disclosed with center leg curvilinear S-joints for reducing losses and for minimizing waste or scrap material during the manufacture of the laminations.

Stacked magnetic transformer core with center leg curvilinear S-joints

Colloidal fluids having improved insulating and/or cooling properties. Embodiments of the invention involve colloidal fluids which comprise a carrier liquid and a dispersed phase of non-metallic particles, wherein the colloidal fluid has a saturation magnetization of less than about 50 Gauss. The compositions may be employed to insulate and/or cool electromagnetic devices, including high power devices, such as power transformers.

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Livingston, NJ, United States of America

Vladimir Segal