Heatsink Design with Thermal Insulator for Encoder Temperature Control

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Solution Overview

Problem

Electric motors with encoders face thermal management issues, particularly at high RPMs, leading to overheating and potential malfunction, with current solutions like fans, heat sinks, and liquid cooling being costly or space-intensive.

Innovation Solution

An electric motor assembly with a heat sink surrounding the encoder, thermally connected to an end cap, and a thermal pad or bridge for efficient heat transfer, along with thermal insulation to manage heat without increasing motor dimensions or using moving parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a motor operates at high RPMs, then productivity increases, but temperature increases causing encoder overheating

Engineering Contradiction:

Improvemotor RPMVSAvoidencoder temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The housing is divided into separate motor compartment and encoder compartment, with the encoder compartment thermally isolated from the motor compartment. This segmentation allows the encoder to be protected from motor-generated heat while the motor operates at high RPMs for improved productivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A thermal insulator is introduced as an intermediary between the motor compartment and encoder compartment. This thermal barrier prevents heat transfer from the motor to the encoder, enabling high-speed operation without encoder overheating.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If torque output is reduced at high RPMs, then encoder temperature is controlled, but motor capacity is underutilized

Engineering Contradiction:

Improveencoder temperatureVSAvoidmotor torque output

Core Design Contradiction:

TemperatureVSPower

Solution Approach 1:

By segmenting the thermal zones through separate compartments and thermal insulation, the system allows the motor to operate at full power while the encoder is protected, eliminating the need to reduce torque output for thermal management.

Inventive Principle:

Principle #1Segmentation

3Temperature

If fans are added for heat circulation, then temperature is reduced, but device complexity and cost increase

Engineering Contradiction:

Improvemotor housing temperatureVSAvoidcooling system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The thermal management system uses passive thermal insulation and natural heat dissipation through the heat sink rather than active cooling components like fans. The structure serves its own thermal management needs without requiring additional powered components.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The solution removes the need for complex active cooling systems by using passive thermal insulation and heat sink structures that naturally manage heat without requiring fans or liquid cooling systems.

Inventive Principle:

Principle #2Taking out (Extraction)

4Temperature

If externally mounted heat sinks are added, then heat transfer is improved, but motor dimensions increase

Engineering Contradiction:

Improvemotor housing temperatureVSAvoidmotor housing area

Core Design Contradiction:

TemperatureVSArea of stationary object

Solution Approach 1:

The heat sink functionality is merged with the existing end cap structure rather than being added as a separate external component. This integration allows heat dissipation without increasing the overall motor dimensions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The heat sink is nested within the existing motor housing structure, specifically integrated into the end cap. This nesting approach provides heat dissipation capabilities without requiring additional external space.

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 solution effectively manages thermal issues at low cost, allowing the motor to operate at full capacity without the need for larger motors or expensive cooling systems, enabling higher torque/RPM ratings.

Implementation Method 1

a heat sink surrounding at least a portion of the encoder, the heat sink in thermal contact with an end cap of the housing at least partially defining the encoder compartment, whereby the heat sink is adapted to absorb heat from the encoder and conduct heat to the end cap

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a thermal insulator between the motor compartment and the encoder compartment for thermally insulating the motor compartment from the encoder compartment

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS9543811B2Heatsink design with thermal insulator to reduce encoder temperature

Publication Date: 2017.01.10 ROCKWELL AUTOMATION TECH INC

AI summary

An electric motor assembly including a housing, an electric motor supported in a motor compartment of the housing, an encoder operatively coupled to the electric motor and supported in an encoder compartment of the housing, and a heat sink surrounding at least a portion of the encoder, the heat sink in thermal contact with an end cap of the housing at least partially defining the encoder compartment, whereby the heat sink is adapted to absorb heat from the encoder and conduct heat to the end cap.