Axial Gap Motor Mounting for Vibration Reduction

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Solution Overview

Problem

In-vehicle devices with motors experience vibration issues due to motor mounting, leading to noise and structural deterioration, and brushless motors face redundancy challenges with coil heating affecting each other set.

Innovation Solution

An axial gap type motor is attached to in-vehicle devices with the axial direction perpendicular to the vertical direction, featuring a rotor and stator with magnets and coils arranged to minimize vibration and heat transfer, and a dual stator configuration for redundancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the motor is mounted with the axial direction parallel to the vertical direction, then the motor can be easily installed, but the motor experiences increased vibration and noise

Engineering Contradiction:

Improveease of installationVSAvoidvibration and noise

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies asymmetry by mounting the motor at an angle of 45 degrees or more relative to the vertical direction, deviating from the conventional parallel mounting. This asymmetric mounting orientation changes the vibration transmission path and reduces the resonance between motor vibration and vehicle body, thereby lowering noise and vibration levels while maintaining installation feasibility

Inventive Principle:

Principle #4Asymmetry

2Reliability

If two sets of coils are wound around each tooth for redundancy, then the motor achieves fault tolerance, but heat from one coil easily affects the other coil

Engineering Contradiction:

ImproveredundancyVSAvoidheat transfer between coils

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent segments the coil arrangement by winding the first and second coils around different teeth instead of winding both coils around the same tooth. This spatial segmentation of coils across multiple teeth reduces thermal coupling between the coils, allowing each coil to be independently cooled while maintaining the redundancy needed for fault tolerance

Inventive Principle:

Principle #1Segmentation

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 reduces motor vibration and noise, improves reliability by minimizing heat transfer between coils, and enhances redundancy through separate stator circuits.

Implementation Method 1

an axial gap type motor including a rotor and a stator opposing each other in an axial direction

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

The motor is attached to the in-vehicle device so that the axial direction is perpendicular to a vertical direction

Methodology Applied

Scientific EffectVibration isolation: Damping

Data Source

PatentUS11649742B2Attachment structure for vehicle motor, in-vehicle equipment, and brushless motor

Publication Date: 2023.05.16 DENSO CORP

AI summary

An attachment structure for a vehicle motor is applied for the purpose of attaching a vehicle motor to in-vehicle equipment. The attachment structure for a vehicle motor is provided with an axial gap motor that includes a rotor and a stator facing each other in the axial direction. The motor is attached to the in-vehicle equipment in a mode in which the axial direction is perpendicular to the vertical direction.