Uniaxial Drive Unit Layout for PCU and Noise Filter Integration
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Solution Overview
Problem
Existing drive units with a uniaxial structure face challenges in securing space for both a power control unit (PCU) and a noise filter due to their compact size, making it difficult to achieve an efficient electromechanical integrated structure.
Innovation Solution
The PCU and noise filter are integrated with the transaxle case, with the noise filter positioned between the power control unit and the motor, optimizing space utilization and ensuring efficient installation even in a compact uniaxial structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drive unit adopts a uniaxial structure with motor, speed reducer, and differential mechanism disposed on the same axis, then the overall size is reduced, but there is insufficient space to accommodate both the power control unit and noise filter
Solution Approach 1:
The noise filter is disposed inside the power control unit housing, with the noise filter housing forming part of the power control unit assembly. This nesting arrangement allows both components to occupy the same spatial envelope, effectively solving the space constraint in the uniaxial drive unit structure
Solution Approach 2:
The power control unit and noise filter are arranged in a stacked configuration along the axial direction, with the noise filter positioned below the power control unit. This vertical stacking utilizes the axial dimension efficiently, accommodating both components within the limited radial space of the uniaxial structure
2Area of stationary object
If the power control unit and noise filter are integrated with the transaxle case, then space efficiency is improved, but the installation space for both components becomes extremely limited
Solution Approach 1:
The power control unit is separated into distinct functional modules: the power control unit housing, the noise filter housing, and the motor housing. Each module is independently designed and assembled, allowing flexible spatial arrangement and optimizing the use of limited integration space within the transaxle case
Solution Approach 2:
The noise filter housing is merged with the power control unit housing to form an integrated assembly that is then mounted on the transaxle case. This merging reduces the number of separate components and simplifies the overall integration process while maintaining efficient space utilization
Data Source
AI summary
A drive unit includes: a transaxle case that houses a motor, a speed reducer, and a differential mechanism; a power control unit that controls the motor; and a noise filter electrically connected to the motor via the power control unit, the power control unit being integrated with the transaxle case, the motor, the speed reducer, and the differential mechanism being disposed on a same axis inside the transaxle case. Further, the power control unit is separate from the noise filter, and the noise filter is integrated with the transaxle case in a state in which at least a part of the noise filter is disposed in space between the power control unit and the motor.