Integrated EV Drive Unit Housing With Shared-Wall Cooling
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Solution Overview
Problem
Electric powertrains in electric vehicles face challenges in optimizing space, weight, and energy efficiency, particularly in powersport vehicles where space and weight are limited, due to the separate housing of electrical inverters and motors, leading to increased conductor lengths and inefficiencies.
Innovation Solution
A drive unit housing with a shared wall separating compartments for the electrical inverter and electric motor, reducing conductor lengths and incorporating fluid pathways for cooling within the housing to enhance efficiency and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrical inverter and electric motor are housed separately, then each component can be independently optimized and maintained, but the overall system occupies more space and has increased conductor lengths leading to higher energy losses
Solution Approach 1:
The patent combines the electrical inverter and electric motor into a single integrated drive unit housing with separate compartments. This merging approach reduces the overall system volume and packaging space while maintaining independent component boundaries for optimization and maintenance purposes.
Solution Approach 2:
The shared wall structure serves multiple functions: it physically separates the inverter and motor compartments, provides mounting surfaces for components, and acts as a structural support element. This multi-functionality allows the housing to achieve space efficiency without compromising component independence.
2Ease of manufacture
If the electrical inverter and electric motor are housed separately, then each component can be independently optimized and maintained, but the conductor lengths increase leading to higher electrical losses
Solution Approach 1:
By integrating the inverter and motor within the same housing structure, the patent significantly reduces the physical distance between electrical connections. This merging approach minimizes conductor lengths and associated electrical losses while preserving independent component optimization capabilities.
3Volume of moving object
If the drive unit housing is designed to be compact, then space efficiency is improved, but cooling effectiveness may be compromised
Solution Approach 1:
The housing is segmented into separate compartments for the inverter and motor, each with dedicated cooling pathways. This segmentation allows compact packaging while maintaining effective cooling for each component through isolated fluid circulation routes within the shared wall structure.
Solution Approach 2:
The patent utilizes three-dimensional cooling pathways embedded within the shared wall structure, allowing cooling fluid to flow through internal channels rather than requiring external space. This dimensional approach enables effective cooling within a compact housing volume.
4Adaptability or versatility
If separate housing is used for inverter and motor, then component independence is maintained, but the overall system complexity increases
Solution Approach 1:
The patent merges the inverter and motor housings into a single integrated structure with shared walls and common mounting features. This combination reduces the total number of separate components and assembly operations, thereby reducing system complexity while maintaining component independence through internal compartmentalization.
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
The solution provides a space-efficient and performance-enhanced powertrain by reducing electrical inductance and line losses, while maintaining effective cooling without increasing the overall footprint, thus improving the responsiveness, range, and reliability of electric vehicles.
Implementation Method 1
a shared wall the separates the electrical inverter and the electric motor into different compartments
Implementation Method 2
incorporating fluid pathways for cooling within the housing
Implementation Method 3
electrical input terminals electrically coupled to the output terminals via one or more openings extending through the shared wall
Data Source
AI summary
Drive units for electric vehicles are provided. One example provides a drive unit for an electric vehicle including a first housing section forming a first compartment to house an electrical inverter and a second housing section forming a second compartment to house an electric motor. The drive unit housing further includes an inlet port to receive a fluid and a shared wall separating the first compartment and the second compartment. The shared wall defines fluid pathways in fluid communication with the inlet port to circulate the fluid to cool the electrical inverter. The drive unit also includes an outlet port in fluid communication with the fluid pathways to discharge the fluid.