Spring-Loaded Holding Device for Amorphous Transformer Cores

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Solution Overview

Problem

Conventional holding devices for soft-magnetic transformer stack cores with amorphous and/or nanocrystalline microstructures impose high mechanical stresses, leading to increased losses and reduced energy efficiency due to the need for high clamping forces, which deteriorate the magnetic permeability of the iron alloys.

Innovation Solution

A holding device with two holding units and a mechanical fixing means that allows detachable connection, featuring a spacer and spring elements to absorb clamping forces, reducing mechanical stress on the transformer stack core by using elastic deformation to maintain the holding state, thus minimizing the forces acting on the core.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional holding devices with high clamping forces are used to secure the transformer stack core, then the holding stability is improved, but the mechanical stress on the core increases leading to reduced magnetic permeability and increased energy losses

Engineering Contradiction:

Improveholding stabilityVSAvoidenergy losses

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The patent changes the force parameter from high static clamping force to low dynamic spring force. The spring elements provide sufficient holding force through elastic deformation while maintaining forces below 100 N, compared to conventional high clamping forces, thus preserving magnetic permeability and reducing energy losses

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces spring elements as intermediary components between the holding device and the transformer stack core. These springs act as a buffer that transmits holding force while limiting peak forces, thereby protecting the core from excessive mechanical stress that would deteriorate its magnetic properties

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If conventional holding devices with high clamping forces are used to secure the transformer stack core, then the holding stability is improved, but the magnetic permeability of the iron alloys deteriorates

Engineering Contradiction:

Improveholding stabilityVSAvoidmagnetic permeability

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If detachable mechanical fixing means are used to connect holding units, then the ease of assembly and disassembly is improved, but the device complexity increases

Engineering Contradiction:

Improveassembly easeVSAvoiddevice complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent divides the holding device into separate holding units that can be independently assembled and disassembled. Each holding unit can be attached to the transformer stack core separately, and the mechanical fixing means connects these modular units, facilitating easy assembly and disassembly while keeping individual components simple

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution significantly reduces mechanical stresses on the transformer stack core, maintaining energy efficiency by minimizing the forces applied, allowing for easier assembly and reducing manufacturing costs through inherent stability and reduced manufacturing accuracy requirements.

Implementation Method 1

at least one spring element which can be arranged between at least one holding unit and the transformer stack core, wherein the holding device is designed such that the spring element is elastically deformed by at least indirect contact with the transformer stack core when it is arranged on the holding device

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP3503134B1Holding device for holding a soft-magnetic stacked core of a transformer and transformer

Publication Date: 2020.01.29 EHMANN BERSTREETCAR

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AI summary

The invention relates to a holding device (5) for holding a soft magnetic transformer stack core (2) with layers having an amorphous and/or nanocrystalline microstructure made of an iron alloy, wherein the transformer stack core (2) has two coil legs (3) extending parallel to each other and two yokes (4) connected to opposite ends of the coil legs (3). The holding device (5) has two holding units (6, 7), each of which can be arranged on one of the two yokes (4) such that the holding units (6, 7) are arranged at opposite end regions of the transformer stack core (2), and at least one mechanical fixing means (8) engaging the two holding units (6, 7), by means of which the two holding units (6, 7) are detachably connected to each other without damage.In order to provide a more energy-efficient transformer (1), the holding device (5) has at least one spacer (9) clamped between the holding units (6, 7) and at least one spring element that can be arranged between at least one holding unit (6, 7) and the transformer stack core (2), wherein the holding device (5) is designed such that the spring element is elastically deformed when the transformer stack core (2) is arranged on the holding device (5) by means of at least indirect contact with the transformer stack core (2).