Triangular End Plate Holes for Rotor Cooling and Positioning
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Solution Overview
Problem
The existing manufacturing methods for rotors of rotating electric machines require separate holes for positioning during assembly and post-assembly inspection, and for coolant discharge, increasing processing complexity and cost, while also risking coolant accumulation and vibration due to imbalance.
Innovation Solution
A rotor design where the yoke cavity portion and end plate hole portions are formed in a substantially triangular shape, allowing for shared use of end plate holes for positioning, inspection, and coolant discharge, preventing coolant accumulation and vibration by exposing both circumferential and outer-diameter-side top portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate holes are provided in the end plate for positioning/inspection and coolant discharge, then positioning accuracy and inspection quality are improved, but the number of processing holes increases and processing complexity is increased
Solution Approach 1:
The end plate hole portion is designed to serve multiple functions simultaneously: it acts as a positioning hole for assembling the rotor yoke, an inspection hole for post-assembly quality control, and a coolant discharge hole for thermal management. This multi-functional design eliminates the need for separate holes for each function, reducing processing complexity while maintaining positioning accuracy through the substantially triangular shape that exposes specific top portions for precise alignment.
2Manufacturing precision
If separate holes are provided for positioning and coolant discharge, then positioning and inspection are improved, but processing steps are extended and cost is increased
Solution Approach 1:
The invention merges the positioning hole, inspection hole, and coolant discharge hole into a single integrated end plate hole portion. The substantially triangular shape of this hole portion allows it to fulfill all three functions simultaneously, reducing the number of processing steps required and improving manufacturing efficiency while maintaining the necessary positioning accuracy for rotor yoke assembly.
3Ease of manufacture
If a conventional hole design is used, then manufacturing is simpler, but coolant accumulation occurs and vibration due to imbalance is generated
Solution Approach 1:
The end plate hole portion is designed with a substantially triangular shape that is asymmetric in its exposure configuration. This asymmetric design ensures that specific top portions (both circumferential side top portions and outer-diameter-side top portion) are exposed, creating a geometry that prevents coolant accumulation while maintaining manufacturing simplicity. The asymmetric shape optimizes coolant flow and discharge, eliminating the harmful effects of coolant accumulation and subsequent vibration.
Data Source
AI summary
A rotor of a rotating electric machine includes a rotor yoke and a pair of end plates disposed on both axial sides of the rotor yoke. The rotor yoke is provided with a yoke cavity portion axially passing through a yoke main body, end plate hole portions communicating with the yoke cavity portion are provided in the pair of end plates, the yoke cavity portion and the end plate hole portions have a substantially triangular shape protruding toward an outer-diameter-side, and in the yoke cavity portion, top portions on both circumferential sides and a top portion on an outer-diameter-side are exposed from the end plate hole portions.