Light-Activated Adhesive Application for Compact Lamination Stacking

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Solution Overview

Problem

Existing methods for producing laminated cores in electric motors or generators require long activation paths for adhesives due to multiple strokes of punching tools, which increases system size and complexity.

Innovation Solution

Utilizing a light-activated adhesive that is irradiated with the required wavelength immediately before exiting the application unit, eliminating the need for long activation paths by activating the adhesive within the adhesive supply line.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a light-activated adhesive is used with multiple strokes of punching tools, then the adhesive can be activated during the stacking process, but the activation path becomes excessively long

Engineering Contradiction:

Improveadhesive activationVSAvoidactivation path length

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The adhesive is activated by light irradiation immediately before exiting the application unit, before the stacking process begins. This preliminary activation eliminates the need for a long activation path during stacking, as the adhesive is already activated when applied to the lamination.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The activation process is extracted from the stacking process and performed separately in the application unit. The light source is integrated into the application unit, allowing adhesive activation to occur independently of the punching and stacking operations, thereby eliminating the dependency on a long activation path.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If a long activation path is provided for adhesive activation, then the adhesive can be activated during stacking, but the system size increases

Engineering Contradiction:

Improveadhesive activationVSAvoidsystem size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The light source for adhesive activation is merged with the application unit, combining two functions (adhesive application and activation) into a single integrated device. This eliminates the need for a separate activation path and reduces the overall system size.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Adhesive activation is performed preliminarily in the application unit before the adhesive is applied to the lamination. This eliminates the need for additional space during the stacking process for activation, thereby reducing the overall system volume.

Inventive Principle:

Principle #10Preliminary action

3Length of stationary object

If the adhesive is activated immediately before exiting the application unit, then the activation path is shortened, but the adhesive must remain stable during storage and transport

Engineering Contradiction:

Improveactivation path lengthVSAvoidadhesive stability

Core Design Contradiction:

Length of stationary objectVSStability of the object's composition

Solution Approach 1:

The adhesive's properties are changed by light irradiation immediately before application. The adhesive is stored in an unactivated state with stable composition, and only when exposed to light in the application unit does its chemical structure change to become activated. This parameter change on demand allows short activation path while maintaining storage stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The adhesive is prepared in an unactivated stable state for storage and transport, then activated preliminarily right before application. This timing of activation ensures the adhesive remains stable during storage while achieving the required activation state immediately before use, eliminating the need for a long activation path.

Inventive Principle:

Principle #10Preliminary action

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

This approach reduces the system size and simplifies the adhesive application process, allowing for efficient bonding of laminations without the need for extensive activation paths, while maintaining adhesive strength and stability.

Implementation Method 1

a light-activated adhesive is used as the adhesive, which is irradiated and activated with light of the required wavelength immediately before exiting from an application unit

Methodology Applied

Scientific EffectLight activation: Photopolymerisation

Data Source

PatentUS12447729B2Method for producing lamination stacks and application device for an adhesive for performing the method

Publication Date: 2025.10.21 FEINTOOL INTERNATIONAL HOLDING AG

AI summary

An adhesive application device is provided for carrying out a method for producing a lamination stack for rotors and stators of electric motors or generators, wherein a light-activated adhesive is applied to one side of electric steel prior to punching out laminations or to at least one side of already punched-out laminations, wherein the adhesive is irradiated and activated with a light of required wavelength immediately before the adhesive exits from an application unit, and wherein laminations are then punched out from the electric steel and stacked or the already punched-out laminations are stacked to a lamination stack. The adhesive application device has at least one application unit with at least one valve for discharging an adhesive. At least one radiation source is arranged in a region of the valve and emits radiation and directs the radiation to the adhesive provided in the region of the at least one valve.