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Bulk amorphous metal inductive device

An induction device, amorphous technology, applied to magnetic objects, inductors with magnetic cores, parts of transformers/inductors, etc., can solve problems such as impractical large devices, increased ohmic losses, and low magnetic induction values, and achieve Effects of Difficulty and Complexity Removal

Inactive Publication Date: 2006-02-15
METGLAS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although soft ferrites generally have attractive low losses, their low magnetic induction values ​​result in impractically large devices for many applications where space is an important consideration
Furthermore, the increased size of the core undesirably necessitates longer electrical windings, so ohmic losses increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091] Preparation and Electromagnetic Test of Amorphous Metal Rectangular Prism

[0092] About 25mm wide and 0.022mm thick Fe 80 B 11 Si 9A strip of ferromagnetic amorphous metal is wound around a rectangular mandrel or bobbin having dimensions of approximately 25 mm wide and 60 mm long. About 1300 turns of ferromagnetic amorphous metal strip were wound around a mandrel or bobbin, resulting in a rectangular core form with internal dimensions of about 25mm wide and 60mm long and a build thickness of about 30mm. Anneal the core / bobbin assembly in a nitrogen atmosphere. The annealing included: 1) heating the assembly to 365°C; 2) maintaining the temperature at about 365°C for about 2 hours; and 3) cooling the assembly to ambient temperature. A rectangular, wound, amorphous metal core is removed from the core / bobbin assembly and then dipped in a low viscosity thermally activated epoxy that impregnates and infiltrates the adjacent laminated structure space between. The epoxy...

example 2

[0100] High-frequency behavior of low-loss bulk amorphous metal components

[0101] The core loss data included in Example 1 above were analyzed using conventional nonlinear regression methods. Certainly, by Fe 80 B 11 Si 9 The core loss of a bulk amorphous part composed of amorphous metal strips can be mainly defined by a function of the form

[0102] L(B max , f)=c 1 f(B max ) n +c 2 f q (Bmax) m coefficient c 1 and c 2 Appropriate values ​​for the sum indices n, m and q are chosen to define an upper limit for the magnetic loss of the bulk amorphous metal part. Table 5 lists the measured losses for the components in Example 1 and the losses predicted by the above formula, each loss measured in watts per kilogram. Utilization factor c 1 = 0.0074 and c 2 = 0.000282 and exponent n=1.3, m=2.4 and q=1.5 calculated as f(Hz) and B max Prediction loss as a function of (Tesla). The measured loss of the bulk amorphous metal part in Example 1 is less than the correspon...

example 3

[0105] Fabrication of Amorphous Metal Trapezoidal Prisms and Sensors

[0106] About 25mm wide and 0.022mm thick Fe 80 B 11 Si 9 Ferromagnetic amorphous metal strips were cut into lengths of approximately 300 mm. About 1300 layers of cut ferromagnetic amorphous metal strips were laminated to form a rod about 25 mm wide and 300 mm long with a build thickness of about 30 mm. The rods were annealed in a nitrogen atmosphere. The annealing included: 1) heating the rod to 365°C; 2) maintaining the temperature at about 365°C for about 2 hours; and 3) cooling the rod to ambient temperature. The rods were vacuum impregnated with an epoxy resin solution and cured at 120°C for about 4.5 hours. The weight of the resulting laminated, epoxy-bonded, amorphous metal rod was approximately 1300 g.

[0107] The rod was cut using a 1.5 mm thick cutting blade to form four substantially identical trapezoidal prism components. At each end of each prism a mating surface. The mating faces are ...

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Abstract

A bulk amorphous metal inductive device comprises a magnetic core having plurality of low-loss bulk ferromagnetic amorphous metal magnetic components assembled in juxtaposed relationship to form at least one magnetic circuit and secured in position, e.g. by banding or potting. The device has one or more electrical windings and may be used as a transformer or inductor in an electronic circuit. Each component comprises a plurality of similarly shaped layers of amorphous metal strips bonded together to form a polyhedrally shaped part. The low core losses of the device, e.g. a loss of at most about 12 W / kg when excited at a frequency of 5 kHz to a peak induction level of 0.3 T, make it especially useful for application in power conditioning circuits operating in switched mode at frequencies of 1 kHz or more. Air gaps are optionally interposed between the mating faces of the constituent components of the device to enhance its energy storage capacity for inductor applications. The inductive device is easily customized for specialized magnetic applications, e.g. for use as a transformer or inductor in power conditioning electronic circuitry employing switch-mode circuit topologies and switching frequencies ranging from 1 kHz to 200 kHz or more.

Description

technical field [0001] The present invention relates to induction devices, and more particularly, to high efficiency, low core loss induction devices having a core assembled from a plurality of bulk amorphous metal magnetic components. Background technique [0002] Induction devices are an essential component of many modern electrical and electronic devices, most commonly including transformers and inductors. Most of these devices employ an iron core comprising soft ferromagnetic material and one or more electrical windings surrounding the iron core. Inductors typically employ a single winding with two terminals and act as a filter and energy storage device. Transformers usually have two or more windings. They transform the voltage from one level to at least one other required level and electrically isolate different parts of the overall circuit. Inductive devices may have widely varying dimensions with correspondingly varying power capabilities. Different types of induc...

Claims

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Application Information

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IPC IPC(8): H01F17/06H01F27/245H01F41/02
CPCH01F41/0233H01F27/245Y10T29/4902H01F1/15333H01F3/14H01F17/04H01F27/2804H01F27/29H01F27/32H01F2027/2819
Inventor N·J·德克里斯托法罗G·E·菲什R·哈斯伽瓦S·V·塔提科拉
Owner METGLAS INC
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