Transformer Coil Pressing Fitting Segmentation

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Solution Overview

Problem

Amorphous oil-immersed transformers face challenges in reducing size and weight while maintaining the strength of coil pressing metal fittings to suppress deformation caused by high short-circuit electromagnetic mechanical forces, as adding reinforcement members increases external dimensions and mass.

Innovation Solution

A coil pressing metal fitting with a base member and external reinforcement members connected through holes, using a joining member, which allows for a lightweight and space-saving design that includes U-shaped or cutout reinforcement members to enhance strength and promote oil circulation for improved cooling efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a stay (reinforcement member) is added and plate thickness is increased to improve the strength of the coil pressing metal fitting, then the strength is improved, but external dimensions become large and total mass increases

Engineering Contradiction:

Improvestrength of coil pressing metal fittingVSAvoidtotal mass

Core Design Contradiction:

StrengthVSWeight of stationary object

Solution Approach 1:

The coil pressing metal fitting is segmented into a base member and separate reinforcement members (stays). The reinforcement members are disposed outside the base member and connected through holes formed in the base member, allowing the strength to be enhanced without increasing the overall footprint or mass significantly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reinforcement members are positioned in a different spatial dimension (outside the base member) rather than increasing the thickness of the base member itself. This allows strength enhancement in the radial direction without increasing the axial dimension, thus avoiding increased external dimensions and mass.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

Engineering Contradiction:

Improvestrength of coil pressing metal fittingVSAvoidexternal dimensions

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The fitting is divided into a base member and external reinforcement members connected through holes. This segmentation allows the reinforcement to be added without increasing the overall external dimensions of the base member itself.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reinforcement is achieved by adding members in the radial direction (outside the base member) rather than increasing the axial thickness. This dimensional approach maintains compact external dimensions while enhancing strength through strategic placement of reinforcement members.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20230238172A1Transformer

Publication Date: 2023.07.27 HITACHI IND EQUIP SYST CO LTD

AI summary

There is provided a transformer (101) in which deformation of a coil (403, 503, 603) caused by a short-circuit electromagnetic mechanical force can be suppressed by using a coil pressing metal fitting (303, 401, 501, 601) that saves space and that is lightweight.A coil pressing metal fitting (303, 401, 501, 601) includes a coil pressing metal fitting base member (201, 301) that comes into contact with a coil (403, 503, 603), and a reinforcement member (302) disposed outside the coil pressing metal fitting base member (201, 301). The reinforcement member (302) is connected and fixed to the coil pressing metal fitting base member (201, 301) by a joining member from inside the coil pressing metal fitting base member (201, 301) through the hole (202, 204) of the coil pressing metal fitting base member (201, 301).