Integrated Coolant Passages for Motor Pump Heat Dissipation

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Solution Overview

Problem

Conventional motors in garden tools, such as electric cleaning machines, face inefficiencies in heat dissipation due to air cooling, leading to overheating and affecting normal equipment operation.

Innovation Solution

A power assembly with a first and second coolant flow passage for the controller and motor, respectively, connected in series or parallel, utilizing a thermal conductive heat dissipation base and insulating coolant to enhance heat exchange, and a water cooling system without additional driving elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If air cooling is used for the controller and motor, then the structure is simple, but the heat dissipation efficiency is low causing overheating

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidcooling system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent combines the cooling functions for the controller and motor into a single integrated water cooling system. The first coolant flow passage cools the controller while the second coolant flow passage cools the motor, both sharing common coolant circulation infrastructure. This merging approach achieves efficient heat dissipation for both components without proportionally increasing system complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent transitions from air cooling to water cooling by introducing coolant flow passages. The first coolant flow passage uses hydraulic flow to remove heat from the controller, and the second coolant flow passage uses hydraulic flow to remove heat from the motor. This hydraulic cooling approach significantly improves heat dissipation efficiency compared to conventional air cooling.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If water cooling system is added, then heat dissipation efficiency improves, but device complexity increases

Engineering Contradiction:

Improveoperational stabilityVSAvoidcooling system structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cooling system is designed to serve multiple functions simultaneously. The same water cooling infrastructure cools both the controller and the motor through different coolant flow passages. This multi-functionality approach improves reliability by ensuring both critical components are cooled effectively while avoiding the need for separate cooling systems that would increase complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The coolant circulation system is designed to automatically circulate coolant through the first and second coolant flow passages without requiring additional driving elements. The system uses the existing pump and motor assembly to drive coolant circulation, making the cooling system self-sufficient and reducing overall device complexity.

Inventive Principle:

Principle #25Self-service

3Productivity

If high power operation is maintained for long time, then productivity increases, but heat generation causes overheating and equipment failure

Engineering Contradiction:

Improvecontinuous operation capabilityVSAvoidmotor and controller temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The water cooling system enables continuous high-power operation by continuously removing heat from the controller and motor. The coolant circulates continuously through the first and second coolant flow passages, maintaining effective heat dissipation throughout extended operation periods. This continuous cooling action allows the equipment to sustain high-power output without overheating, thereby improving productivity.

Inventive Principle:

Principle #20Continuity of useful action

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

Improves heat dissipation efficiency, allowing motors to operate at high power for extended periods and reduces failure rates by effectively dissipating heat through water cooling.

Implementation Method 1

the first coolant flow passage is configured to be capable of exchanging heat with a heating element of the controller

Methodology Applied

Scientific EffectHeat exchange: Conduction (thermal)

Implementation Method 2

the second coolant flow passage is configured to be capable of exchanging heat with an outer housing of the motor

Methodology Applied

Scientific EffectHeat exchange: Conduction (thermal)

Implementation Method 3

the coolant is capable of passing through the first coolant flow passage and the second coolant flow passage in a process of flowing from the main liquid inlet to the main liquid outlet

Methodology Applied

Scientific EffectHeat absorption: Convection

Data Source

PatentUS20250293566A1Power assembly, motor pump assembly and garden tool

Publication Date: 2025.09.18 GLOBE (JIANGSU) CO LTD

AI summary

A power assembly includes a motor, a controller and a first cooling unit. The controller is electrically connected with the motor. The first cooling unit includes a first coolant flow passage and a second coolant flow passage, wherein the first coolant flow passage is configured to be capable of exchanging heat with a heating element of the controller, and the second coolant flow passage is configured to be capable of exchanging heat with an outer housing of the motor. The first coolant flow passage and the second coolant flow passage are connected in series or in parallel.