Stator Airflow Structure for Uniform Axial Temperature Distribution
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Solution Overview
Problem
Existing generator/motor designs face issues with uneven airflow velocity and temperature distribution in the stator due to varying air pressure differences, leading to significant temperature differences in the stator coil and core, which can affect reliability and stability.
Innovation Solution
A structure comprising a first and second stator pressing plate, an axial ring plate, and a circumferential ring plate is installed to create a space behind the stator core, allowing for a two-way airflow with equal airflow volume, maintaining a constant static air pressure difference and uniform airflow speed, thereby reducing axial temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a stepped tooth structure is configured at the edge of segment of the stator's core to increase flow area and reduce airflow speed in the gap, then the uniformity of axial temperature distribution of the coil and core is improved, but the compression of the core segments is impacted
Solution Approach 1:
The invention divides the airflow control function into multiple independent components: the first stator pressing plate, second stator pressing plate, axial ring plate, and circumferential ring plate. These segmented structures work together to regulate airflow through the gap without requiring modification of the core segments themselves, thus maintaining both temperature uniformity and core compression integrity
Solution Approach 2:
The invention introduces an intermediary airflow regulation system consisting of pressing plates and ring plates that mediate between the airflow source and the core segments. This intermediary structure controls the airflow characteristics (speed and distribution) without directly contacting or interfering with the core segments, thereby solving the temperature uniformity problem while preserving core compression
2Speed
If the maximum combined velocity of the airflow in the gap exceeds 30m/s, then the cooling effect is enhanced, but it causes uneven velocity distribution in the air channels of stator, resulting in a large temperature difference of the stator coil or core
Solution Approach 1:
The invention dynamically adjusts airflow parameters (velocity and distribution) by modifying the gap dimensions through the pressing plates and ring plates. By changing the geometric parameters of the airflow path, the system optimizes the airflow velocity to remain below 30m/s while ensuring uniform distribution across all air channels, thereby preventing excessive temperature differences in the stator components
Solution Approach 2:
The invention applies different gap dimensions at different locations along the axial direction of the stator. The first and second stator pressing plates create varying gap sizes to locally regulate airflow speed, ensuring that each region of the stator receives appropriate cooling without creating uneven velocity distribution that would lead to temperature differences
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
The solution effectively reduces axial temperature differences by 10-15K, ensuring uniform temperature distribution and enhancing the reliability and stability of the generator/motor.
Implementation Method 1
a number of air channels are arranged in the stator in order to cool the stator coil and core
Implementation Method 2
The air may flow in different manner in various structures. The so-called forward airflow is diverted to the air channels of stator from the gap
Implementation Method 3
the air pressure difference between the gap and the back behind the air channels is increased so that the airflow speed inside the air channels of stator also keeps increasing along the airflow direction
Data Source
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AI summary
Provided is a method and structure for improving uniformity of axial temperature distribution of stator, which relates to the field of generator, characterized in that the method comprises steps of : a. installing a structure for improving uniformity of axial temperature distribution of stator to a wind generator; b. installing a first stator pressing plate, a second stator pressing plate, an axial ring plate, a circumferential ring plate and a stator core for the structure for improving uniformity of axial temperature distribution of stator, wherein an angle between the circumferential ring plate 11 and the axial ring plate is 85 degrees to 95 degrees, forming a space behind a stator core; c. configuring a two-way airflow, in an axial direction of stator, having same airflow volume between the space behind the stator core and the gap between stator and rotor. The present invention is simple and flexible in operation and convenient to be implemented, and can keep the static air pressure difference at a constant value and uniformize the axial airflow speed in the air channels of stator, and thereby effectively reducing the axial temperature difference between the stator coil and core, ensuring the reliability and stability of the generator/motor.