Ring-Shaped Inverter Casing for Rotating Machine Cooling
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Solution Overview
Problem
There is a need for a compact rotating electrical machine unit with high cooling performance that can be easily installed on vehicles, while also reducing the size of the unit and increasing its output.
Innovation Solution
The solution involves a rotating electrical machine unit with a ring-shaped stator and rotator, integrated with a power inverter having a ring-shaped casing and a heat radiation unit within a coolant path, where the power modules are arranged to face the inner and outer peripheries of the coolant path, enhancing heat exchange with a cooling medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotating electrical machine and power inverter are integrated to reduce size, then the device compactness is improved, but the cooling performance deteriorates due to limited space for cooling structures
Solution Approach 1:
The power inverter is integrated with the rotating electrical machine by stacking the inverter body on the stator, merging two separate devices into a compact unit. This integration reduces overall size while the shared cooling structure ensures adequate cooling performance for both components through a unified coolant circulation system.
Solution Approach 2:
The cooling structure serves multiple functions simultaneously: it cools the power modules in the inverter, cools the stator coil of the rotating electrical machine, and provides structural support. The coolant circulation system is designed to distribute cooling medium to multiple heat-generating components, achieving efficient cooling of the integrated unit as a whole.
2Temperature
If the power modules are arranged to face inner and outer peripheries of the coolant path, then the heat exchange efficiency is improved, but the device complexity increases
Solution Approach 1:
The coolant path is designed with a ring shape that wraps around the stator, allowing power modules to be positioned at different radial positions (inner and outer peripheries) along the coolant flow. This curved,环形 layout enables efficient heat exchange from multiple sides of the power modules while maintaining a relatively simple circular coolant circulation system.
3Temperature
If the first coolant path is formed by closing a ring-shaped concave space with the stator surface, then the cooling performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The coolant path structure is merged with the stator assembly, where the ring-shaped concave space formed in the inverter body is closed by the stator surface itself. This integration eliminates the need for separate end caps or closure structures, simplifying manufacturing while creating an effective sealed coolant circulation chamber for enhanced cooling.
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 provides a compact rotating electrical machine unit with high cooling performance, allowing efficient installation on vehicles and effective cooling of both the power modules and stator coil, thereby improving the overall efficiency and reliability of the unit.
Implementation Method 1
the power module has a heat radiation unit arranged in the first coolant path and exchanging heat with a cooling medium flowing in the first coolant path
Implementation Method 2
the heat radiation unit has first and second radiation surfaces radiating heat from the pair of transistors
Data Source
AI summary
A rotating electrical machine unit includes a rotating electrical machine including a ring-shaped stator and a rotator provided inside of the stator, and a power inverter including a ring-shaped first casing and a power module accommodated in the first casing and integrated with the rotating electrical machine by being stacked in such a manner that a lower surface of the first casing is in contact with an upper surface of the stator. The power inverter has a first coolant path formed to have a ring shape in the first casing. The power module has a heat radiation unit arranged in the first coolant path and exchanging heat with a cooling medium flowing in the first coolant path.