Rotor Core Clearance Groove Prevents Refrigerant Port Clogging
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Solution Overview
Problem
The pressing of a rotor shaft into a rotor core can cause clogging of the refrigerant receiving port due to the generation of chips, which hinders the cooling process of the rotor in rotating electric machines.
Innovation Solution
A rotor design that includes a clearance groove on the inner peripheral surface of the rotor core facing the refrigerant supplying port of the rotor shaft, preventing contact and scraping during assembly and thus avoiding clogging of the refrigerant receiving port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotor shaft is pressed into the rotor core to assemble the rotor, then the rotor structure is formed and refrigerant cooling is enabled, but chips are generated during pressing that can clog the refrigerant receiving port
Solution Approach 1:
The clearance groove part is formed in advance on the inner peripheral surface of the rotor core at the position facing the refrigerant receiving port. This preliminary structural preparation ensures that during the pressing operation, the rotor shaft outer peripheral surface will not contact the refrigerant receiving port, thereby preventing chip generation and clogging before the problem can occur.
Solution Approach 2:
The clearance groove part acts as an intermediary protective structure between the rotor shaft and the refrigerant receiving port. By introducing this intermediate feature, the direct contact and scraping between the rotor shaft outer peripheral surface and the refrigerant receiving port is prevented, thus protecting the refrigerant receiving port from chip contamination.
2Strength
If the rotor shaft outer peripheral surface and rotor core inner peripheral surface are scraped during pressing for assembly, then the rotor components are secured together, but chips are generated that may clog the refrigerant receiving port
Solution Approach 1:
The clearance groove part is pre-formed on the rotor core inner peripheral surface at the position corresponding to the refrigerant receiving port. This preliminary action creates a protective gap that prevents the rotor shaft from contacting and scraping the refrigerant receiving port during pressing, thereby preventing chip generation while still allowing adequate pressing for assembly fixation.
Solution Approach 2:
The clearance groove part serves as an intermediary protective structure that separates the rotor shaft outer peripheral surface from the refrigerant receiving port. This intermediate feature allows the pressing operation to proceed for proper assembly fixation while preventing direct contact that would generate chips and clog the refrigerant receiving port.
Data Source
AI summary
The rotor of the rotating electric machine includes the rotor shaft and the rotor core. The rotor shaft has the shaft refrigerant passage and the refrigerant supplying port on the outer peripheral surface of the rotor shaft, the shaft refrigerant passage extending in an axial direction, the refrigerant supplying port communicating with the shaft refrigerant passage. The rotor core has the rotor core refrigerant passage and the refrigerant receiving port on the inner peripheral surface of the rotor core, the rotor core refrigerant passage extending in the axial direction, the refrigerant receiving port communicating with the rotor core refrigerant passage and facing the refrigerant supplying port of the rotor shaft. A clearance groove part is provided at a portion that is on the inner peripheral surface of the rotor core and that faces the refrigerant supplying port of the rotor shaft, the clearance groove part extending in the axial direction.