EV Drive Unit Shared-Wall Layout for Shorter Inverter-Motor Links
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Solution Overview
Problem
Existing electric vehicle powertrains face challenges in achieving efficient space utilization and reduced electrical connection lengths between the electrical inverter and electric motor, which affects performance and efficiency.
Innovation Solution
A drive unit housing that separates the electrical inverter and electric motor into different compartments with a shared wall, allowing for compact packaging and reduced electrical connection lengths, while also incorporating fluid pathways for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrical inverter and electric motor are housed separately, then each component can be optimized independently, but the overall system occupies more space and has longer electrical connection lengths
Solution Approach 1:
The patent combines the electrical inverter and electric motor into a single integrated housing structure. The housing includes a first compartment for the electrical inverter and a second compartment for the electric motor, with the wall between them serving as a shared wall. This merging reduces the overall system volume and eliminates the need for separate housings, directly resolving the contradiction between compact packaging and structural complexity.
Solution Approach 2:
The shared wall between the first and second compartments serves multiple functions: it acts as a structural boundary separating the two compartments, provides mounting surfaces for electrical connections, and serves as part of the cooling fluid pathway structure. This multi-functionality reduces the total number of components needed while maintaining independent optimization capabilities for each component.
2Loss of energy
If the electrical inverter and electric motor are placed close together, then electrical connection lengths are reduced improving efficiency, but heat dissipation becomes more challenging
Solution Approach 1:
The shared wall acts as an intermediary structure that facilitates both electrical connections and thermal management. Electrical leads pass through openings in the shared wall to connect the inverter and motor with minimal length. Simultaneously, the shared wall incorporates cooling fluid pathways that mediate heat transfer from both compartments, allowing close proximity without compromising heat dissipation.
Solution Approach 2:
The patent implements a cooling fluid pathway system that flows through the shared wall and both compartments. The cooling fluid is supplied to the first compartment, flows through the shared wall, and then to the second compartment, providing continuous thermal management. This hydraulic cooling system enables the inverter and motor to be positioned close together while maintaining effective heat dissipation.
3Volume of moving object
If a shared wall is used to separate compartments, then space efficiency is improved, but manufacturing and assembly complexity increases
Solution Approach 1:
The housing is segmented into distinct first and second compartments with a shared wall, allowing each compartment to be manufactured separately and then assembled. The shared wall includes integrated cooling pathways and electrical connection openings that can be pre-formed during manufacturing of individual sections, reducing overall assembly complexity despite the integrated design.
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 high-performance drive unit by minimizing electrical conductor lengths and integrating cooling fluid pathways within the housing, enhancing the overall efficiency and reliability of the electric vehicle powertrain.
Implementation Method 1
fluid pathways formed in a shared wall of the housing to cool the electrical inverter
Implementation Method 2
circulate fluid to cool the electrical inverter and the electric motor
Data Source
AI summary
Drive units for electric vehicles are provided. One example provides a drive unit for an electric vehicle including a housing having a first compartment and a second compartment separated from one another by a shared wall, an electrical inverter disposed within the first compartment and having a set of electrical output terminals, and an electric motor disposed within the second compartment and having electrical input terminals electrically coupled to the output terminals via one or more openings extending through the shared wall.