Motor Controller Thermal Management via Inductor Heat Absorption
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Solution Overview
Problem
Existing motor starter controllers for auxiliary power units face challenges in managing thermal energy generated by electronic components, often requiring additional parts and increased complexity through separate heat units or active cooling systems to maintain operational limits.
Innovation Solution
A motor starter controller design that transfers thermal energy from low thermal capacity electric components to high thermal capacity components using a thermally conductive base plate, eliminating the need for active cooling systems by aligning heat-producing IGBTs with inductors of greater mass to absorb and dissipate heat efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling systems or separate heat units are used to manage thermal energy, then temperature control is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the heat-generating IGBTs and heat-absorbing inductors into a single integrated motor controller unit, eliminating the need for separate cooling systems. The inductors serve dual purposes: electrical function and thermal management, absorbing heat from IGBTs through direct thermal contact while performing their electrical inductance function.
Solution Approach 2:
The inductors within the controller automatically absorb and dissipate heat generated by the IGBTs during operation without requiring external active cooling systems. The thermal mass of the inductors serves as a passive heat sink, allowing the system to self-regulate temperature through the natural thermal conduction between components.
2Temperature
If active cooling systems are used to manage thermal energy, then temperature control is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the heat-generating IGBTs and heat-absorbing inductors into a single integrated motor controller unit, eliminating the need for separate cooling systems. The inductors serve dual purposes: electrical function and thermal management, absorbing heat from IGBTs through direct thermal contact while performing their electrical inductance function.
Solution Approach 2:
The inductors within the controller automatically absorb and dissipate heat generated by the IGBTs during operation without requiring external active cooling systems. The thermal mass of the inductors serves as a passive heat sink, allowing the system to self-regulate temperature through the natural thermal conduction between components.
3Temperature
If heat producing circuits are separated into separate units, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent combines the heat-generating IGBTs and heat-absorbing inductors into a single integrated motor controller unit, eliminating the need for separate cooling systems. The inductors serve dual purposes: electrical function and thermal management, absorbing heat from IGBTs through direct thermal contact while performing their electrical inductance function.
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 maintains the motor controller within desired operational temperature ranges without active cooling, reducing complexity and cost by leveraging the thermal mass of inductors to manage heat generated by IGBTs, ensuring reliable operation across multiple start attempts.
Implementation Method 1
heat producing components mounted to both sides of a thermally conductive base plate. Thermal energy is absorbed by components with excess thermal capacity
Implementation Method 2
Thermal energy is absorbed by components with excess thermal capacity such that components with low thermal capacity remain within a desired operational temperature range
Data Source
Figure 1~3
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AI summary
A starter motor controller (18) for an auxiliary power unit (10) transfers thermal energy from low thermal capacity electric components (22) to high thermal capacity electric components (24,26) to control temperature without active cooling systems.