Outer Rotor Motor Stator Cavity Layout for Reduced Thickness

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Solution Overview

Problem

Existing outer rotor motors face challenges in reducing thickness due to the overlapping positional relationship between the rotary shaft and electronic components, which limits further miniaturization.

Innovation Solution

The motor design incorporates a stator core with a cavity portion for housing electronic components, allowing for a reduction in motor thickness by enabling closer proximity of the stator core and circuit board without affecting the rotary shaft.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the electronic component is disposed in the space formed in the central portion of the stator core between the protective cover and the circuit board, then the motor structure is simplified, but the motor thickness cannot be further reduced due to the overlapping positional relationship between the rotary shaft and electronic component

Engineering Contradiction:

Improvemotor structureVSAvoidmotor thickness

Core Design Contradiction:

Device complexityVSLength of moving object

Solution Approach 1:

The patent changes the spatial arrangement from a planar overlapping configuration to a three-dimensional integrated configuration. The electronic component is disposed in the central portion of the stator core with the rotary shaft passing through it, utilizing the axial dimension to resolve the thickness issue. This dimensional reorganization allows both components to coexist without increasing motor thickness.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements a nested configuration where the rotary shaft passes through the electronic component, and both are integrated within the stator core structure. The protective cover encompasses both the electronic component and the rotary shaft, creating a compact nested arrangement that reduces overall motor thickness while maintaining structural simplicity.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If the protective cover temporarily fixes the shaft and partitions the space, then the electronic component and rotary shaft can be disposed separately, but the motor thickness is increased

Engineering Contradiction:

Improvecomponent assemblyVSAvoidmotor thickness

Core Design Contradiction:

Ease of manufactureVSLength of moving object

Solution Approach 1:

The patent merges the electronic component and the rotary shaft into a single integrated structure where the rotary shaft passes through the electronic component. This merging eliminates the need for separate partitioning by a protective cover, allowing both components to be manufactured and assembled together as one unit, thereby reducing motor thickness while maintaining ease of manufacture.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250132642A1Motor, blower, and vehicle

Publication Date: 2025.04.24 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

Provided are a motor, a blower, and a vehicle that can be further thinned. Outer rotor motor (1) includes stator (3), rotor (2), and electronic component (41). Stator (3) includes stator core (31). Rotor (2) includes rotary shaft (20), and has axis (A1) as a rotation center. Circuit board (4) includes electronic component (41). Stator core (31) includes stator body (32) and a plurality of teeth (33). Stator body (32) has shaft hole (36) into which rotary shaft (20) is inserted. The plurality of teeth (33) are provided at an end portion of stator body (32). Stator body (32) further includes cavity portion (37) different from shaft hole (36). Electronic component (41) is disposed in cavity portion (37).