Removable Heating Elements for Motor Frame Condensation Control

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Solution Overview

Problem

Existing electric motor designs face challenges in installing low-cost, low-temperature heating elements that prevent condensation without damaging the stator windings, especially in compact spaces where traditional methods are difficult and costly.

Innovation Solution

The implementation of thin, curved, removable heating elements that mount circumferentially on the motor frame, avoiding contact with insulated stator windings and using a semi-rigid mounting plate with a flexible, silicone-sheathed active heater to provide effective heating while maintaining a physical decoupling and allowing for easy installation and removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If heating elements are attached directly to the stator winding to prevent condensation, then heating effectiveness is improved, but the risk of damaging insulation and difficulty of removal increases

Engineering Contradiction:

Improvecondensation preventionVSAvoidinsulation damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary mounting structure (clamps, brackets, or adhesive mounts on the motor frame) that positions the heating element in close proximity to the stator winding without direct contact. This mediator allows thermal energy to reach the winding through radiant and convective heating while preventing direct thermal conduction that could damage the insulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The heating element is designed as a separate, removable component distinct from the stator winding assembly. This segmentation allows the heating element to be independently installed, positioned, and removed without affecting the stator winding or its insulation, thereby eliminating the risk of insulation damage during installation or maintenance.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If tubular or strip heating elements are attached to motor end bells or frame, then installation is simplified, but achieving low surface temperature while providing sufficient heat becomes difficult

Engineering Contradiction:

Improveinstallation easeVSAvoidsurface temperature control

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent employs a flexible thin-film heating element that can be conformally mounted to the motor frame or end bell surface. This thin-film construction provides a large surface area relative to its volume, enabling efficient heat dissipation to the surrounding air while maintaining a low surface temperature. The flexibility allows it to conform to curved surfaces, simplifying installation on various motor configurations.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The heating element is designed as a thin, two-dimensional film rather than a three-dimensional tubular structure. This dimensional change increases the surface area-to-volume ratio, allowing the element to dissipate heat more effectively to the surrounding air while maintaining low operating temperature, yet still provides sufficient heating capability when positioned near the stator winding.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Temperature

If fins are attached to tubular heating elements to lower surface temperature, then temperature control is improved, but installation difficulty increases

Engineering Contradiction:

Improvesurface temperatureVSAvoidinstallation difficulty

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

Instead of attaching discrete fins to a tubular element, the patent uses an integrated thin-film heating element that inherently provides large surface area for heat dissipation. This thin-film construction eliminates the need for separate fin attachments, thereby maintaining low surface temperature without increasing installation complexity.

Inventive Principle:

Principle #30Flexible shells and thin films

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 simplifies the assembly process, prevents condensation effectively, and maintains a safe surface temperature, addressing the limitations of traditional heating element installation methods by ensuring the heating elements can be easily removed and replaced without damaging the motor or insulation.

Implementation Method 1

a heating element positioned inside the enclosure... The heating element provides suitable heating of the insulated stator windings through heated air

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

provides heating of the insulated stator windings through heated air

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS10615674B2Rotating electrical machine with removable heating elements

Publication Date: 2020.04.07 INNOMOTICS LLC

AI summary

A rotating electrical machine with one or more heating elements is provided in that the one or more heating elements mount circumferentially on an inside of a frame or enclosure of the rotating electrical machine. The rotating electrical machine comprises an enclosure with multiple cooling fins, insulated stator windings positioned inside the enclosure, and a heating element positioned inside the enclosure. The heating element provides suitable heating of the insulated stator windings through heated air to prevent condensation while being physically decoupled from an insulation of the insulated stator windings.