Varnish for inductive core, method of making the varnish, and method of making an inductive core
OwnerMichael Gerald Minnickinventor
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Abstract
A varnish composition, an inductive core made with the varnish composition, and methods of making the varnish composition and the core. The varnish composition includes an acrylic copolymer compound, a cosolvent having at least one of amine and amide functionality, and water. The varnish composition yields high bond strength when there are extended air dry periods prior to curing.
Claims42
A varnish composition comprising:
- an acrylic copolymer;
- a cosolvent including at least one of an amine and an amide functionality;
- and water;
- said acrylic copolymer, said cosolvent, and said water being in amounts sufficient to impart extended air dry characteristics to the varnish composition.
An inductive core for electrical equipment comprising:
- plural laminations stacked on one another;
- and
- a varnish composition on said laminations, said varnish composition comprising an acrylic copolymer, a cosolvent including at least one of an amine and an amide functionality, and water, said acrylic-copolymer compound, said cosolvent, and said water being in amounts sufficient to impart extended air dry characteristics to said varnish composition.
A method of manufacturing an inductive core for electrical equipment comprising the steps of:
- stacking plural laminations on one another;
- and
- coating a varnish composition on the laminations, the varnish composition comprising an acrylic-copolymer, a cosolvent including at least one of an amine and an amide functionality, and water, said acrylic-copolymer, said cosolvent, and said water being in amounts sufficient to impart extended air dry characteristics to the varnish composition.
A method of manufacturing an inductive core for electrical equipment comprising:
- stacking plural laminations on one another;
- coating the laminations with a varnish composition comprising an acrylic-polymer, a cosolvent including amine or amide functionality, and water;
- air drying the varnish composition after said coating step;
- and
- curing the varnish composition after said air drying step;
- the acrylic polymer, the cosolvent, and the water being in amounts sufficient to impart adequate strength to the varnish composition after said curing step to permit further operations on the inductive core.
A method as recited in claim 32, wherein said curing step comprises baking the varnish composition at 80-100° C. for 30 minutes and baking the varnish composition at 170-190° C. for 30 minutes.
A method of manufacturing a varnish composition comprising the steps of:
- mixing an acrylic copolymer, a cosolvent including at least one of amine and amide functionality, and water in amounts sufficient to impart extended air dry characteristics to the varnish composition.
Dependencies are inferred from the claim text.