Rotary Electric Machine Protection Plate Axial Load Distribution
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Solution Overview
Problem
Existing rotary electric machine units in electric vehicles lack sufficient protection for coils during collisions, leading to potential short circuits and ground faults due to inadequate collision guard designs.
Innovation Solution
A rotary electric machine unit with a protection plate attached to the storage case, featuring first and second load input areas that distribute collision loads away from the coils, ensuring the stator core and bearings absorb the impact, preventing coil damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the storage case is designed to accommodate the rotary electric machine, then the machine is protected, but additional protection structures are needed to prevent coil damage during axial collisions
Solution Approach 1:
The protection plate acts as an intermediary component between the external environment and the rotary electric machine. It is attached to the outer surface of the storage case and provides an additional layer of protection by intercepting axial collision loads before they can reach the coils. The plate's strategic positioning and load distribution design ensure that collision forces are directed to robust structures like the stator core and bearing, preventing coil damage while maintaining ease of manufacture.
2Reliability
If the protection plate is positioned to overlap with the stator core, then the coils are protected from axial collision loads, but the plate must be precisely positioned to avoid interfering with other components
Solution Approach 1:
The protection plate is designed with localized functional areas rather than being a uniform structure. The first load input area is specifically positioned to overlap with the stator core in the axial direction, creating a localized protection zone for the coils. This local quality approach allows the plate to provide targeted protection where it is most needed while maintaining simplicity in overall design and positioning.
Data Source
AI summary
A protection plate is at least partly provided on a first side surface of a storage case, and includes a first load input area provided outside a first coil end portion in a radial direction and at a position overlapping with a stator core when viewed from the axial direction, and a second load input area provided at a position overlapping with at least one of a bearing and a rotor shaft when viewed from the axial direction. When a load is input to a rotary electric machine unit from the one end side in the axial direction, the load is transmitted to the storage case from the first load input area and the second load input area of the protection plate.