Elastic Holder for Rotor Magnet Axial Detachment Prevention

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Solution Overview

Problem

Existing rotor units with magnets attached to a rotor main body face challenges in securely fixing the magnets, as existing holders may not effectively prevent axial detachment and require complex configurations to stabilize the magnet position.

Innovation Solution

The rotor unit employs a holder with elastically deformable arms and hook portions that lock into specifically designed hook holes on the rotor main body, ensuring secure attachment and alignment of magnetic flat plates to maintain magnet position and stability, using a single mold for manufacturing to reduce costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a holder is provided to prevent magnet detachment, then magnet security is improved, but device complexity increases

Engineering Contradiction:

Improvemagnet securityVSAvoidholder configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The holder is divided into multiple pressing arms that can independently press against different portions of the magnet. Each pressing arm is elastically deformable and can be engaged with the rotor main body through hook portions, allowing distributed securing of the magnet while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pressing arms are designed to be elastically deformable, allowing them to flex during assembly and operation. This dynamic characteristic enables the holder to accommodate manufacturing tolerances and maintain consistent pressing force on the magnet without requiring complex adjustment mechanisms.

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If multiple holders are used to stabilize magnet position, then magnet position stability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvemagnet position stabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The holder design integrates multiple functions into a single component: it prevents axial detachment of the magnet, maintains radial positioning, and provides elastic cushioning. The pressing arms can press against different surfaces of the magnet depending on the specific design configuration, eliminating the need for separate holders for different functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Multiple pressing arms are integrated into a single holder body that is attached to the rotor main body as one piece. The holder combines the functions of multiple individual holders into a unified structure, reducing the total number of parts and simplifying manufacturing while maintaining magnet position stability.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If complex holder configurations are used to prevent axial detachment, then magnet security is improved, but assembly efficiency decreases

Engineering Contradiction:

Improveaxial detachment preventionVSAvoidassembly efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The pressing arms are pre-configured with elastic deformation capabilities and hook portions that engage with the rotor main body in predetermined positions. During assembly, the holder is simply attached to the rotor main body, and the pressing arms automatically assume their functional positions and apply the required pressing force, eliminating complex assembly steps.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The elastic pressing arms automatically adjust their position and apply appropriate pressing force on the magnet based on the mechanical engagement with the rotor main body. The holder structure itself provides the necessary constraint and positioning without requiring additional adjustment mechanisms or complex assembly procedures.

Inventive Principle:

Principle #25Self-service

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 configuration securely fixes the magnet, stabilizes the rotor unit, and allows for efficient assembly and recyclability, addressing the issues of axial detachment and manufacturing complexity while reducing production costs.

Implementation Method 1

a holder including a plurality of elastically deformable pressing arms

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS20240079918A1Rotor unit and rotor main body for electric motor

Publication Date: 2024.03.07 KANZAKI KOKYUKOKI MFG

AI summary

[Problem] To provide a rotor unit that may effectively prevent detachment of a magnet with a holder while absorbing dimensional errors of a rotor main body and the magnet.[Solution] In the rotor unit according to the present invention, the holder mountable on the rotor main body prevents the magnet from being detached from the rotor main body. The holder includes an elastically deformable insertion arm extending from a flat-plate like holder main body, a hook portion provided on a free end side of the insertion arm, an elastically deformable magnet pressing arm extending from the holder main body, and a magnet pressing portion provided on a free end side of the magnet pressing arm. The rotor main body includes a hook hole into which the insertion arm is inserted, and the hook hole is provided with a locking portion in which the hook portion is lockable. When the hook portion is locked in the locking portion, the magnet pressing portion presses an end face of the magnet due to inherent elasticity of the magnet pressing arm accompanying elastic deformation.