Power Tool Thermal Conduction Member for Heat Dissipation

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Solution Overview

Problem

Existing power tools, such as angle grinders, face a technical contradiction between sealing and heat dissipation, where sealing prevents metal debris from entering but leads to heat accumulation, causing demagnetization of magnetic materials and motor failure, while heat dissipation is hindered by the sealed structure.

Innovation Solution

Incorporating a thermal conduction member between the stator and rotor of the electric motor, which conducts heat into an airflow channel for dissipation, using a seal member to prevent debris entry, and a fan to circulate airflow for effective heat removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electric motor structure is sealed to prevent metal debris from entering, then the reliability of the electric motor is improved, but heat dissipation is hindered causing heat accumulation and demagnetization

Engineering Contradiction:

Improveprotection from metal debrisVSAvoidheat accumulation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The sealed structure is divided into two functional zones: a sealed first gap between stator and rotor for protection, and an open second gap in the airflow channel for heat dissipation. This segmentation allows simultaneous achievement of both reliability and temperature control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sealing qualities are applied to different regions: the first gap has complete sealing to prevent debris entry, while the second gap remains open to allow airflow and heat dissipation. This local differentiation resolves the contradiction between protection and cooling.

Inventive Principle:

Principle #3Local quality

2Temperature

If the electric motor structure is open for heat dissipation, then temperature control is improved, but metal debris can enter and cause short circuits or blockage

Engineering Contradiction:

Improveheat dissipationVSAvoidprotection from metal debris

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The air gap is segmented into two functional sections: a sealed first gap for debris protection and an open second gap for heat dissipation airflow. This allows the motor to simultaneously achieve both temperature control and reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thermal conduction member acts as an intermediary that transfers heat from the sealed first gap region to the open second gap region, enabling heat dissipation through the airflow channel while maintaining the sealed protection structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If sealing is implemented to protect electronic components, then resistance to harmful factors is improved, but heat dissipation capability deteriorates

Engineering Contradiction:

Improvemetal debris protectionVSAvoidheat dissipation

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The motor structure is segmented into a sealed first gap for debris protection and an open second gap connected to the airflow channel for heat dissipation, allowing simultaneous achievement of both protection and thermal management.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thermal conduction member serves as a mediator that conducts heat from the sealed protected region to the open airflow region, enabling heat dissipation without compromising the sealed protection structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution enhances heat dissipation efficiency, protects the motor from overheating, and prolongs the service life of power tools by ensuring effective heat management without compromising sealing.

Implementation Method 1

a thermal conduction member, which is disposed at least between the rotor and the stator and extends toward the airflow channel to conduct heat between the rotor and the stator into the airflow channel

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a fan, operative to be connected with the electric motor shaft and driven by the electric motor to drive the airflow into motion

Methodology Applied

Scientific EffectForced convection: Forced Convection

Data Source

PatentUS11161232B2Angle grinder, air blower, and power tool

Publication Date: 2021.11.02 NANJING CHERVON IND

AI summary

A power tool includes a housing, a tool attachment, an output shaft, an electric motor, and an airflow channel. The housing includes an air inlet and an air outlet, and an airflow channel is formed between the air inlet and the air outlet. The electric motor includes an electric motor shaft, a stator and a rotor. The power tool further includes a thermal conduction member disposed between the rotor and the stator and configured to transfer heat between the rotor and the stator into the airflow channel. Further disclosed is an angle grinder. The power tool has good heat dissipation performance.