Rotating Machine Coupling Ventilation for Stator Cooling

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Solution Overview

Problem

Existing rotating devices face challenges in achieving high-speed rotation and size reduction while effectively cooling heat generation sources like the coil and stator core, which tend to generate higher temperatures.

Innovation Solution

The rotating device incorporates a shaft member, a rotating body with a tubular shape, bearings, and coupling members with ventilation channels and blades oriented in specific directions to facilitate efficient gas flow for cooling, allowing for size reduction without additional ventilation ports.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high speed rotation is achieved, then productivity is improved, but temperature of heat generation sources increases

Engineering Contradiction:

Improverotation speedVSAvoidcoil and stator core temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The invention extracts the cooling function from the bearing structure by introducing a separate coupling member with ventilation channels. This allows the bearing to focus on support while the coupling member handles thermal management through dedicated gas flow passages that extract heat from the stator and coil.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The coupling member acts as an intermediary between the bearing and the rotating body, providing a medium (ventilation channels and blades) that facilitates heat removal. The blades generate gas flow that mediates the cooling process by transporting heat away from the heat generation sources.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If size reduction is achieved, then device compactness is improved, but cooling efficiency deteriorates

Engineering Contradiction:

Improvedevice sizeVSAvoidheat dissipation efficiency

Core Design Contradiction:

Volume of moving objectVSTemperature

Solution Approach 1:

The invention merges the coupling function with the cooling function in a single component. The coupling member simultaneously couples the bearing to the rotating body and provides ventilation channels for cooling, eliminating the need for separate cooling ports and reducing overall device size.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The coupling member serves multiple functions: mechanical coupling between bearing and rotor, structural support, and thermal management through integrated ventilation channels. This multi-functionality reduces the number of components needed and enables compact design without sacrificing cooling capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Temperature

If additional ventilation ports are added, then cooling efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvecooling efficiencyVSAvoidventilation port configuration

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The invention combines the ventilation channels directly into the coupling member structure, merging the cooling function with the existing mechanical coupling component. This eliminates the need for additional separate ventilation ports and reduces structural complexity while maintaining effective cooling.

Inventive Principle:

Principle #5Merging (Combining)

4Temperature

If axial length is increased, then cooling performance is improved, but device size increases

Engineering Contradiction:

Improveheat dissipation performanceVSAvoidaxial length

Core Design Contradiction:

TemperatureVSLength of moving object

Solution Approach 1:

The invention transitions from axial cooling (which would increase length) to radial cooling through the coupling member. The ventilation channels are configured to allow gas flow in the radial direction, enabling effective heat dissipation without increasing the axial dimension of the device.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 stabilizes high-speed rotation, reduces device size, and efficiently cools the stator and heat generation sources by utilizing the gas flow through the ventilation channels, ensuring effective heat dissipation without increasing the device's axial length.

Implementation Method 1

a ventilation channel communicating with an inside and an outside of the rotating body... a gas can flow inside the rotating body in the axial direction

Methodology Applied

Scientific EffectGas flow: Convection

Implementation Method 2

the coupling member may include a plurality of blades, and the plurality of blades may be oriented in a direction inclined with respect to an axial direction of the shaft member

Methodology Applied

Scientific EffectImpeller effect: Impeller

Data Source

PatentUS12407222B2Rotating machine

Publication Date: 2025.09.02 MINEBEAMITSUMI INC

AI summary

Provided is a rotating device having excellent performance of cooling a heat generation source. Included are a shaft member, a rotating body having a tubular shape and rotatable about the shaft member, a bearing supporting the rotating body with respect to the shaft member, and a coupling member disposed between the bearing and the rotating body in a radial direction (cd). The coupling member includes a ventilation channel communicating with an inside and an outside of the rotating body.