Asymmetric Lamination Ring Layout for Quieter Rotor Cores

Solution Overview

Problem

Existing laminated rotor cores for electric machines often generate vibrations and noise, leading to a less smooth operation.

Innovation Solution

A lamination ring design for a laminated rotor core, featuring receiving openings for permanent magnets arranged in pairs and V-shape, and structural elements rotated at an offset angle relative to the axis of symmetry, allowing for the assembly of laminated rotor cores with reduced vibrations and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional laminated rotor cores are used, then the rotor can be assembled and function, but vibrations and noise are generated leading to rough operation

Engineering Contradiction:

Improvesmoothness of operationVSAvoidvibrations and noise

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent applies asymmetry by rotating every second lamination ring by 180 degrees relative to the others. This creates an asymmetric arrangement where the structural elements (such as slots or magnets) are offset between adjacent rings, preventing symmetric vibration patterns and reducing overall vibrations and noise during rotor operation.

Inventive Principle:

Principle #4Asymmetry

2Stability of the object's composition

If multiple lamination rings are stacked to form the rotor core, then the rotor structure is created, but vibrations and noise are generated

Engineering Contradiction:

Improverotor core structureVSAvoidvibrations and noise

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent applies asymmetry by rotating every second lamination ring by 180 degrees relative to the others. This creates an asymmetric arrangement where the structural elements (such as slots or magnets) are offset between adjacent rings, preventing symmetric vibration patterns and reducing overall vibrations and noise during rotor operation.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12206290B2Lamination ring for a laminated rotor core of a rotor of an electric machine, and method for producing a laminated rotor core made of multiple lamination rings

Publication Date: 2025.01.21 SCHAEFFLER TECHNOLOGIES AG & CO KG

AI summary

A lamination ring for constructing a laminated rotor core for a rotor of an electric machine and a method for producing a laminated rotor core made of multiple lamination rings for a rotor is disclosed. The lamination ring has multiple receiving openings for permanent magnets, and multiple structural elements are arranged homogeneously in the lamination ring at the same distance to one another in the circumferential direction in a rotated manner by an offset angle relative to the axis of symmetry such that the arrangement of structural elements is not symmetrical relative to the axis of symmetry of the lamination ring.