Asymmetric Stator Coil Ends for Heat Dissipation in Integrated Electric Drive
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Solution Overview
Problem
Existing electric drive apparatuses face challenges in effectively dissipating heat generated by the rotating electric machine, leading to increased temperature and reduced output performance, while attempts to address this often result in increased size or reduced output density.
Innovation Solution
The electric drive apparatus is designed with a stator coil configuration where the second coil end part has a larger axial protruding height than the first, facilitating heat dissipation on the opposite axial side of the stator core relative to the transmission, without increasing the axial length of the rotating electric machine, thus allowing for efficient heat dissipation while maintaining compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transmission is integrated with the rotating electric machine on one axial side, then the overall size is reduced and mountability is improved, but heat dissipation becomes insufficient leading to temperature increase
Solution Approach 1:
The patent applies asymmetry by making the axial protruding heights of the two coil end parts different. Specifically, the coil end part on the transmission side has a smaller axial protruding height, while the coil end part on the opposite side has a larger axial protruding height. This asymmetric configuration allows the larger coil end part to serve as a heat dissipation structure on the side away from the transmission, enabling effective heat dissipation while maintaining the compact integrated design.
2Temperature
If the axial protruding height of the coil end part on the transmission side is increased to enhance heat dissipation, then heat dissipation improves, but the axial length of the rotating electric machine increases
Solution Approach 1:
The patent applies local quality by differentiating the axial protruding heights of the two coil end parts based on their specific functions and locations. The coil end part on the transmission side has a smaller protruding height suitable for its space-constrained environment, while the coil end part on the opposite side has a larger protruding height optimized for heat dissipation. This localized differentiation allows effective heat dissipation without increasing the overall axial length of the rotating electric machine.
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 effectively dissipates heat generated in the rotating electric machine, preventing temperature increases and maintaining output performance while avoiding size and complexity increments.
Implementation Method 1
heat generated by the rotating electric machine
Implementation Method 2
facilitating heat dissipation on the opposite axial side of the stator core relative to the transmission
Data Source
AI summary
An electric drive apparatus includes a rotating electric machine and a transmission. The transmission is provided, on one axial side of the rotating electric machine, integrally with the rotating electric machine. The rotating electric machine includes a stator coil that is assembled to a stator core to have first and second coil end parts respectively protruding from first and second axial end faces of the stator core. The axial protruding height of the second coil end part from the second axial end face of the stator core is larger than the axial protruding height of the first coil end part from the first axial end face of the stator core. The first coil end part is located on the same axial side of the stator core as the transmission whereas the second coil end part is located on the opposite axial side of the stator core to the transmission.