Rotor Coil Cooling via Segmented H-Shaped Support
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Solution Overview
Problem
The existing rotor designs for rotary electrical devices, such as turbine-driven generators, suffer from inefficient cooling of the rotor coil due to the lack of a secure air flow path near the electrically conductive members under the retaining ring, leading to high temperatures during high-speed operation.
Innovation Solution
The introduction of a coil support member with a specific H-shape cross-section and communication path allows for a secure flow path of cooling wind to effectively cool the side surfaces of the rotor coil, utilizing the rotating energy to enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional rotor structure without a dedicated cooling flow path is used, then the structure is simple, but the cooling performance of the rotor coil is insufficient leading to high temperatures
Solution Approach 1:
The cooling system is segmented into multiple functional components: a coil support member with H-shaped cross-section that creates distinct cooling channels, communication paths connecting different cooling zones, and structured air flow paths. This segmentation allows the cooling function to be optimized independently while maintaining structural integrity.
Solution Approach 2:
The coil support member acts as an intermediary structure that mediates between the rotor coil and the cooling wind. It provides dedicated cooling channels and communication paths that guide the cooling wind to effectively reach the rotor coil, improving heat dissipation without requiring fundamental changes to the rotor structure.
2Power
If the rotor rotates at high speed (3000-3600 rpm), then power generation capacity increases, but the temperature of electrically conductive members increases due to insufficient cooling
Solution Approach 1:
The cooling system is designed to dynamically adapt to high-speed rotation. The communication paths and cooling channels are structured to utilize the rotational motion and centrifugal forces to enhance cooling wind flow distribution, ensuring effective cooling even at 3000-3600 rpm operating speeds.
Solution Approach 2:
The system employs pneumatic principles by using structured air flow paths and cooling channels to guide cooling wind through the rotor coil. The H-shaped cross-section and communication paths create optimized fluid dynamics for cooling, allowing efficient heat removal at high rotational speeds.
3Temperature
If cooling wind is supplied without a secure flow path, then the structure is simple, but the cooling efficiency is low and temperature reduction is insufficient
Solution Approach 1:
The coil support member features local quality variations with its H-shaped cross-section, where different regions serve specific cooling functions. The communication paths are strategically positioned to deliver cooling wind to specific high-temperature zones of the rotor coil, optimizing cooling efficiency locally where it is most needed.
Solution Approach 2:
The H-shaped cross-section introduces an additional dimensional structure for cooling channel arrangement. This multi-dimensional cooling path configuration allows cooling wind to access the rotor coil from multiple directions and levels, significantly improving cooling efficiency without proportionally increasing structural complexity.
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 design significantly reduces the temperature of the rotor coil by creating an efficient cooling flow path, improving the overall cooling performance and temperature characteristics of the rotor.
Implementation Method 1
a cooling wind to flow on an electrically conductive member forming an axial end of a rotor coil to be cooled
Implementation Method 2
a communication path extending from a radially inner side to a radially outer side... allowing for a secure flow path of cooling wind to effectively cool the side surfaces of the rotor coil
Data Source
AI summary
A rotor (4) for a rotary electrical device to be arranged to face to a stator (5), comprises a rotor iron core (4a) extending axially and including a plurality of slots (6) arranged with a predetermined circumferential interval, a rotor coil (1) contained by the slots (6), a coil support member (13, 13b) of electrically insulating property arranged between parts of the rotor coil (1) at an axial end of the rotor coil (1), and a retaining ring (3) covering the coil support member (13, 13b) and the axial end of the rotor coil (1), the coil support member (13, 13a) has two fitted portions (15, 16) and a connecting portion (12) connecting the fitted portions (15, 16) to each other to form H-shape of cross section and to form a space (11, 14) between the rotor coil (1) and each of opposite sides of the connecting portion (12), and the coil support member (13, 13b) further has a communicating path (120, 120A) communicating to the spaces (11, 14).