Distributed Inverter Mounting for Rotating Electric Machine Thermal Management
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Solution Overview
Problem
Existing rotating electric machines face inefficiencies due to high power consumption and heating issues in inverters, leading to reduced lifespan and reliability, primarily caused by inadequate heat dissipation and thermal gradients.
Innovation Solution
The design disperses inverter components across multiple positions on the housing's periphery, with each inverter supplying current to distinct windings, and incorporates a common control circuit to reduce heat concentration and power consumption, while using cooling fins and recessed portions for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inverter components are concentrated in a single location, then device complexity is reduced, but heat concentration increases causing temperature rise and reduced reliability
Solution Approach 1:
The inverter components (power conversion devices) are segmented and distributed to multiple locations on the housing periphery instead of being concentrated in one location. Each power conversion device is positioned on a different flat portion, which divides the heat generation sources and enables better heat dissipation, thereby reducing temperature rise while maintaining system reliability.
2Temperature
If inverter components are dispersed to multiple locations, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The housing structure is designed with multiple identical flat portions that can universally accommodate power conversion devices. Each flat portion has the same structural characteristics and cooling capabilities, allowing the system to maintain simplicity in design while achieving heat dissipation through distribution. The standardized mounting interfaces and uniform thermal management approach reduce the complexity increase that would normally result from分散ed configuration.
3Temperature
If power conversion devices are positioned on housing periphery, then cooling efficiency is improved, but internal space utilization is reduced
Solution Approach 1:
Instead of placing power conversion devices in the internal space of the housing, the design utilizes the external peripheral surface of the housing for mounting. This dimensional transition from internal to external placement allows the internal volume to remain fully available for other purposes while the external surfaces provide adequate cooling through exposure to ambient air flow.
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 configuration enhances the efficiency and reliability of the rotating electric machine by reducing thermal interference, allowing for smoother operation and improved cooling efficiency, even in the event of inverter failure, and reduces the risk of overheating.
Implementation Method 1
cooling fins and recessed portions for efficient heat dissipation
Implementation Method 2
cooling fins and recessed portions for efficient heat dissipation
Data Source
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AI summary
A rotating electric machine is provided with: a housing; a stator positioned inside the housing; a rotor which is rotated by receiving magnetic flux from the stator; and a power conversion device for supplying a drive current to each coil of the stator. In the rotating electric machine, a plurality of said power conversion devices are positioned at respectively different flat portions formed on the outer perimeter of the housing, and the coil to which a first power conversion device among the plurality of said power conversion devices supplies a drive current and the coil to which a second power conversion device different from the first power conversion device supplies a drive current are different from each other. This makes it possible to provide a rotating electric machine assembly suitable for integrating a control device and other devices.