Vehicle Motor Unit Stator Collision Load Distribution
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Solution Overview
Problem
In vehicle motor units, increasing the thickness of the storage housing's walls to withstand impacts results in increased weight and cost, while existing solutions fail to prevent damage without significant thickness enhancements.
Innovation Solution
A vehicle motor unit design where the stator's outer surface contacts the storage housing's wall surface receiving the highest collision load, with a fastening portion positioned near this contact area, allowing the stator to bear the collision load and minimizing wall thickness increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wall thickness of the storage housing is increased to prevent damage during collision, then the strength and reliability of the storage housing is improved, but the weight and manufacturing cost increase significantly
Solution Approach 1:
The stator's outer circumferential surface is specifically positioned to contact the storage housing wall at the collision-prone area (4th quadrant), providing localized reinforcement only where needed rather than increasing overall wall thickness throughout the entire housing structure
Solution Approach 2:
The stator serves dual functions: as a functional motor component and as a structural reinforcement element that absorbs collision loads, merging the motor assembly with the protective function to avoid adding separate reinforcement structures that would increase weight
2Reliability
If the wall thickness of the storage housing is increased to prevent damage during collision, then the reliability of the storage housing is improved, but the manufacturing cost increases
Solution Approach 1:
Instead of uniformly increasing wall thickness which would require more material and machining operations, the design uses the existing stator component to provide localized structural support at the collision-prone area, reducing material costs and manufacturing complexity
Solution Approach 2:
The stator is designed to serve multiple purposes: electromagnetic function in motor operation and structural reinforcement during collision, eliminating the need for separate reinforcement components and reducing overall manufacturing cost
3Strength
If the wall thickness of the storage housing is increased to prevent damage, then the strength is improved, but the device complexity increases due to additional ribs or structural modifications
Solution Approach 1:
The motor assembly (stator and rotor) is integrated with the storage housing structure such that the stator's position and rigidity provide structural reinforcement, eliminating the need for separate ribs or strengthening features that would increase design and manufacturing complexity
Data Source
AI summary
In a vehicle motor unit comprising: a motor; and a storage housing storing the motor, the motor including a rotor arranged rotatably around a rotation axis, a stator disposed on an outer circumferential side of the rotor, and a high voltage portion disposed on the stator, an outer circumferential surface of the stator is configured to surface contact with a part of a wall surface of the storage housing receiving a larger collision load at the time of a vehicle collision as compared to the other parts.