Pump Motor Cooling Using Delivery Fluid and Coolant Channels

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Solution Overview

Problem

Existing electric motors and power electronics in pumps face inefficiencies in heat dissipation, leading to unacceptable heating that can damage the motor and electronics, hindering the increase in power density.

Innovation Solution

A cooling system is integrated into the pump chamber, utilizing the delivery fluid to cool the motor and power electronics, with coolant channels and heat pipes to direct cooling liquid to specific components, and a control element to manage coolant flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional air cooling with fans is used, then the cooling system is simple, but the heat dissipation efficiency is insufficient leading to high temperatures

Engineering Contradiction:

Improvetemperature of motor and power electronicsVSAvoidheat dissipation efficiency

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

The patent applies hydraulic cooling by using the liquid delivery medium (water or other liquids) to transport heat away from the motor and power electronics through coolant channels. The liquid coolant absorbs heat more efficiently than air, and the pump's pressure system forces the coolant through the channels, achieving effective heat dissipation while utilizing the existing hydraulic system of the pump.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Power

If power density is increased to improve performance, then the size and weight are reduced, but heat generation increases leading to potential damage

Engineering Contradiction:

Improvepower density of drive systemVSAvoidreliability of motor and electronics

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent merges the cooling function with the existing pump system by using the delivery medium of the pump as the coolant. The coolant channels are integrated into the motor and power electronics housing, allowing the same liquid circulation system to serve both pumping and cooling functions. This combination enables effective heat dissipation for high power density applications without requiring separate cooling systems.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of energy

If additional cooling systems are added to improve heat dissipation, then cooling efficiency increases, but device complexity and cost increase

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidcomplexity of cooling system

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent makes the pump's delivery medium serve multiple functions: it acts as both the working fluid for the pump's primary function and as the coolant for thermal management. The coolant channels are integrated into the existing structure, and the same pump that delivers the liquid medium also provides the pressure and flow needed for cooling, eliminating the need for separate cooling pumps and complex cooling infrastructure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Temperature

If coolant channels are added to guide cooling liquid, then targeted cooling of components is achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvetemperature distribution in componentsVSAvoidmanufacturing of motor with coolant channels

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent nests the coolant channels within the existing structure of the motor and power electronics housing. The channels are integrated into the housing walls and internal structures, utilizing the existing cavities and walls rather than adding separate external cooling components. This nesting approach allows targeted cooling of specific components while minimizing additional manufacturing steps.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 system efficiently dissipates heat using the pump's delivery fluid, enhancing cooling efficiency and allowing for increased power density without damage, while being cost-effective and adaptable for retrofitting.

Implementation Method 1

the cooling liquid is provided by the delivery fluid delivered by the pump

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a cooling device of the power electronics and/or the motor is connected to the pump chamber

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 3

heat pipes can be provided on components of the power electronics and/or the electric motor which are remote from the coolant channel

Methodology Applied

Scientific EffectHeat pipe: Heat Pipe

Data Source

PatentUS12614953B2Electric motor

Publication Date: 2026.04.28 KSB SE & CO KGAA

AI summary

An electric motor arrangement for a pump includes power electronics for control of the electric motor driving the pump. For cooling of the electric motor and/or the power electronics, media from a pump chamber of the pump casing flows through a suction-side connection, a coolant channel associated with the power electronics and/or of the electric motor, to a pressure-side connection of the pump. The flow in the coolant channel may be controlled by a thermostat valve.