Brushless Motor Stainless Steel Casing Heat Dissipation

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Solution Overview

Problem

Existing centrifugal pump assemblies with aluminum motor casings require complex and costly treatments to prevent oxidation, corrosion, and wear, leading to long production cycles and logistical complexities, and generate excessive heat.

Innovation Solution

A centrifugal pump assembly with a brushless permanent-magnet electric motor and a stainless steel casing that eliminates the need for additional treatments against corrosion, oxidation, and wear, using a Z cup-shaped stainless steel casing with a tubular gap sleeve and an intermediate connecting element for secure integration, and elastically deformable elements for coupling, which reduces heat generation and production complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If aluminum motor casing is used, then heat dissipation capacity is improved, but production complexity and cost increase due to required anti-corrosion treatments

Engineering Contradiction:

Improveheat dissipation capacityVSAvoidproduction complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent changes the material parameter from aluminum to stainless steel, which fundamentally alters the heat dissipation characteristics and eliminates the need for anti-corrosion treatments. This material substitution resolves the contradiction by accepting slightly reduced heat dissipation performance in exchange for dramatically simplified production processes and eliminated surface treatment requirements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs stainless steel as a composite material solution that integrates both structural integrity and corrosion resistance in a single material, eliminating the need for separate anti-corrosion treatment layers or processes that would be required with aluminum casings.

Inventive Principle:

Principle #40Composite materials

2Temperature

If aluminum motor casing is used, then heat dissipation capacity is improved, but manufacturing cost increases due to treatment processes

Engineering Contradiction:

Improveheat dissipation capacityVSAvoidmanufacturing cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The material parameter change from aluminum to stainless steel eliminates multiple costly surface treatment processes (anodization, powder coating, or anodic oxidation) while maintaining adequate heat dissipation through the motor design and stainless steel's inherent thermal conductivity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent adopts a simpler, more cost-effective material (stainless steel) that eliminates the need for expensive and time-consuming surface treatment processes, reducing overall manufacturing cost despite the base material cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Temperature

If aluminum motor casing is used, then heat dissipation capacity is improved, but production time increases due to multiple treatment steps

Engineering Contradiction:

Improveheat dissipation capacityVSAvoidproduction time

Core Design Contradiction:

TemperatureVSProductivity

Solution Approach 1:

Changing the material parameter to stainless steel eliminates multiple sequential treatment steps (surface preparation, anodization or coating application, curing, quality inspection) that are required for aluminum, thereby significantly reducing production time and increasing manufacturing productivity.

Inventive Principle:

Principle #35Parameter changes

4Temperature

If aluminum motor casing is used, then heat dissipation capacity is improved, but reliability decreases due to oxidation and corrosion

Engineering Contradiction:

Improveheat dissipation capacityVSAvoidresistance to oxidation and corrosion

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The material parameter change to stainless steel fundamentally improves resistance to oxidation and corrosion through the material's inherent chromium oxide protective layer, eliminating the need for additional protective treatments while maintaining adequate heat dissipation performance.

Inventive Principle:

Principle #35Parameter changes

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

The stainless steel casing reduces production time, logistical difficulties, and costs while providing effective heat dissipation and reliable connection between the electronic box and motor casing, resulting in a more efficient and cost-effective pump assembly with lower heat generation.

Implementation Method 1

electric motor (11) of the brushless permanent-magnet type

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

casing (61) made of stainless steel... provides effective heat dissipation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP3511573B1Centrifugal pump assembly with electric motor

Publication Date: 2022.08.03 DAB PUMPS SPA

Figure 1~3
Figure 2
Figure 4a~5

AI summary

A centrifugal pump assembly (10), with electric motor (11) arranged in a casing (61), the assembly (10) comprising, at one end, a wet section (51), formed by a volute (64) and containing an impeller (52), and, at the other end, a box (13), which contains an electrical board (14), in contact with one end of the casing (61). The electric motor (11) is of the permanent-magnet brushless type and the casing (61) is made of stainless steel.