Rotating Electric Machine Drive Unit Radial Power Control Overlap
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Solution Overview
Problem
The existing rotating electric machine drive units for electric vehicles face challenges in reducing size due to the placement of the power control device above the generator and motor, leading to increased dimensions.
Innovation Solution
The design incorporates a second rotating electric machine with a parallel rotation axis, allowing for a power control unit that overlaps with the rotating electric machine housing and the first rotating electric machine in the radial direction, reducing the overall size by optimizing the placement and connection of the power conversion unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power control device is disposed above the generator and motor, then the control functionality is maintained, but the size of the rotating electric machine drive unit is increased
Solution Approach 1:
The power control device is positioned to overlap with the rotating electric machine housing and the first rotating electric machine when viewed from the rotation axis direction. This radial placement in a different dimensional arrangement allows the power control device to share space with existing components, reducing the overall volume of the drive unit while maintaining all necessary control functions.
2Volume of moving object
If the power control device is positioned to overlap with the rotating electric machine housing and first rotating electric machine in the radial direction, then the size is reduced, but the electrical connection complexity increases
Solution Approach 1:
The power control device is nested within the radial space already occupied by the rotating electric machine housing and first rotating electric machine. This nesting arrangement allows the power control device to be embedded in the existing structure, sharing the same radial envelope and reducing overall size while the connecting member manages the electrical connections between nested components.
Solution Approach 2:
A connecting member is introduced as an intermediary element to electrically connect the power control device with the first and second rotating electric machines. This mediator component simplifies the electrical connection arrangement by providing a dedicated interface between the overlapping power control device and the rotating electric machines, managing the complexity of interconnections.
Data Source
AI summary
A rotating electric machine drive unit includes a first rotating electric machine; a second rotating electric machine; a rotating electric machine housing having a rotating electric machine accommodation portion; a power control unit having a power conversion unit which controls at least one of the first rotating electric machine and the second rotating electric machine; and a connecting member which electrically connects at least one of the first rotating electric machine and the second rotating electric machine to the power conversion unit of the power control unit. When viewed from a rotation axis direction of the first rotating electric machine and the second rotating electric machine, a part of the power control unit is disposed so as to overlap with at least one of the rotating electric machine housing and the first rotating electric machine in a radial direction of the first rotating electric machine.