Stator Core Packet Ducts for Rotating Machine Cooling
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Solution Overview
Problem
Existing rotating electrical machines used in high-speed compressor systems, particularly in offshore and deep-sea environments, face challenges in cooling efficiency due to their elongated design, where the center region in the axial direction experiences peak temperatures, and previous cooling methods fail to adequately address this issue.
Innovation Solution
The design incorporates a stator core formed by laminated electromagnetic steel sheets with alternating ducts that allow refrigerant flow in the diameter direction, featuring a larger cross-sectional area on the inflow side than the outflow side, enhancing refrigerant flow rate and reducing ventilation resistance near the center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotational speed is raised to reduce system scale, then the system size is reduced, but the rotor diameter dimension is restricted to avoid exceeding sonic speed
Solution Approach 1:
The stator core is segmented into multiple packet cores with ventilation ducts disposed between them, allowing refrigerant flow paths to be created without increasing the overall rotor diameter. This segmentation enables cooling functionality to be integrated within the existing dimensional constraints.
2Power
If the shaft length is made long to increase output power at high rotational speed, then the output power is increased, but the temperature distribution becomes uneven with peak temperature near the center in the axial direction
Solution Approach 1:
Different regions of the stator core are provided with different cooling configurations - packet cores with ventilation ducts are disposed at specific locations to target the peak temperature region near the center in the axial direction. This local differentiation of cooling quality addresses the uneven temperature distribution without requiring uniform cooling throughout the entire length.
Solution Approach 2:
Refrigerant serves as an intermediary cooling medium that flows through ventilation ducts between packet cores, transferring heat from the stator core to the surrounding environment. This intermediary fluid enables effective heat removal from the peak temperature region while maintaining the elongated shaft design for high output power.
3Temperature
If ventilation ducts are added to cool the center region, then the cooling efficiency is improved, but the ventilation resistance increases due to the shape of the inflow port
Solution Approach 1:
The packet cores are arranged asymmetrically with ventilation ducts positioned to optimize refrigerant flow paths. The ducts are configured with appropriate orientations and cross-sectional areas that reduce flow resistance while effectively reaching the peak temperature region, rather than using symmetric arrangements that would increase ventilation resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly improves cooling efficiency near the center of the rotating electrical machine, effectively lowering peak temperatures and leveling temperature distribution along the axial direction.
Implementation Method 1
a duct providing a flow channel to cause a refrigerant to flow in a diameter direction of the stator is formed between one packet core and an adjacent, other packet core
Implementation Method 2
a flow channel to cause a refrigerant to flow in a diameter direction of the stator
Data Source
AI summary
The invention provides a rotating electrical machine system in which an air volume of a refrigerant is increased near the center of a rotating electrical machine in the axial direction is improved. The rotating electrical machine includes a rotor and a stator, in which the stator core, laminated electromagnetic steel sheets formed by laminating a plurality of electromagnetic steel sheets in the axial direction are divided into a plurality of sets of packet cores, and between one of the packet cores of the plurality of sets and another packet core adjacent to it, there is formed a duct providing a flow channel of the stator, and in a duct situated at the center side from both ends in the axial direction among the duct, there is a portion of two packet cores facing each other across the duct, a diameter direction length of the two packet cores becoming long.