Rotor Containment Ring for Coolant Control in Electric Motors
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Solution Overview
Problem
Existing electric motors, particularly in electric vehicles, face challenges in efficiently managing heat generation and coolant flow, leading to inefficiencies and increased complexity due to the need for additional components to prevent coolant spillage between the rotor and stator assemblies.
Innovation Solution
A rotor assembly with an integrated containment ring formed during the molding process using a rotor core mold member, which restricts coolant flow from the rotor core outlets to the stator assembly, reducing the need for separate end plates and enhancing coolant directionality for effective heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate end plates are used to prevent coolant spillage, then coolant containment is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The containment ring is integrated into the rotor core mold member, combining the functions of magnet retention and coolant containment into a single component. This eliminates the need for separate end plates while maintaining effective coolant containment, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The rotor core mold member serves multiple functions: it retains the magnets in the cavities, forms the containment ring for coolant, and provides structural support. This multi-functionality reduces the total number of components needed while maintaining effective coolant containment
2Ease of operation
If additional components are added to manage coolant flow, then coolant directionality is improved, but manufacturing complexity increases
Solution Approach 1:
The containment ring is formed as an integral part of the rotor core mold member during the same manufacturing process, combining coolant direction control with magnet retention. This eliminates the need for separate manufacturing steps and assembly operations for additional coolant management components
3Reliability
If separate containment components are used, then coolant restriction is improved, but weight increases
Solution Approach 1:
The containment ring is integrated into the rotor core mold member, eliminating the need for separate containment components. This integration maintains effective coolant restriction while reducing the total weight by removing redundant parts
Solution Approach 2:
The rotor core mold member simultaneously provides magnet retention and coolant containment functions, eliminating the need for additional separate components that would increase weight while maintaining effective coolant restriction
Data Source
AI summary
A rotor assembly for an electric motor includes a rotor core, a plurality of magnets, and a rotor core mold member. The rotor core defines a rotor bore and a plurality of cavities distributed about the rotor bore and extending through the rotor core. The plurality of magnets are disposed in the plurality of cavities. The rotor core mold member extends through the plurality of cavities to retain the plurality of magnets therein and, from the cavities, extends to a first end of the rotor core forming a containment ring at the first end. The containment ring forms a rim above a surface of the first end to restrict flow of a fluid to an outer side surface of the rotor core.