Method of reducing audible noise in magnetic cores and magnetic cores having reduced audible noise
AssigneeMetglas, Inc.
InventorsMark Robert Columbus, Robert Brown, Kengo Takahashi, Ryusuke Hasegawa
Life of this patent
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Abstract
An amorphous alloy-based magnetic core with reduced audible noise and a method of making the amorphous alloy-based magnetic core emanating low audible noise, including: placing the core with multiple layers of high strength tape on the core legs, wherein the tapes have a high tensile strength, high dielectric strength and high service temperature, resulting in reduced level of audible noise. When operated under optimum condition, the reduced level of audible noise is 6-10 dB less when compared with a same-size core that has been coated with resin instead.
Claims16
An amorphous alloy-based magnetic core having reduced audible noise, comprising:
- a rectangular shape core having four legs:
- a first core leg,
- a second core leg being opposite to the first core leg and having a cut ribbon overlap section,
- a third core leg, and
- a fourth core leg being opposite to the third core leg;
- a plurality of non-overlapping high strength tapes placed on the sides of the third core leg and the fourth core leg, wherein the high strength tapes exhibit high mechanical strength, high dielectric strength, and high service temperature;
- a first layer of overlapping high strength tapes wrapped helically on the third core leg and the fourth core leg;
- a second layer of overlapping high strength tapes placed on a top face of the first core leg in a direction parallel to the length of the first core leg;
- a third layer of overlapping high strength tapes placed on the top face of the first core leg in a direction perpendicular to the length of the first core leg;
- a fourth layer of overlapping high strength tapes placed on a bottom face of the first core leg in a direction parallel to the length of the first core leg;
- and
- a fifth layer of overlapping high strength tapes placed on the bottom face of the first core leg in a direction perpendicular to the length of the first core leg,
- wherein the magnetic core having a reduced level of audible noise emanating from the core.
A method of reducing low audible noise of an amorphous alloy-based magnetic core, comprising:
- providing the magnetic core having four core legs arranged in a rectangular shape, the magnetic core further comprising:
- a first core leg,
- a second core leg being opposite to the first core leg and having a cut ribbon overlap section,
- a third core leg, and
- a fourth core leg being opposite to the third core leg;
- placing a plurality of non-overlapping high strength tapes on the sides of the third core leg and the fourth core leg, wherein the high strength tapes exhibit high mechanical strength, high dielectric strength, and high service temperature;
- wrapping a first layer of overlapping high strength tapes helically on the third core leg and the fourth core leg;
- placing a second layer of overlapping high strength tapes on a top face of the first core leg in a direction parallel to the length of the first core leg;
- placing a third layer of overlapping high strength tapes on the top face of the first core leg in a direction perpendicular to the length of the first core leg;
- placing a fourth layer of overlapping high strength tapes on a bottom face of the first core leg in a direction parallel to the length of the first core leg;
- and
- placing a fifth layer of overlapping high strength tapes on the bottom face of the first core leg in a direction perpendicular to the length of the first core leg,
- the magnetic core having a reduced level of audible noise emanating from the core.
Dependencies are inferred from the claim text.