Radial Ventilation Cooling Structure for Motor with Gradient Impedance
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Solution Overview
Problem
Conventional radial ventilation cooling structures for motors result in non-uniform airflow distribution through ventilation channels, leading to uneven temperature distribution across the motor, which can cause shutdowns and thermal deformation due to excessive local temperature rises.
Innovation Solution
The proposed radial ventilation cooling structure adjusts the impedances of multiple ventilation channels by varying their structures, such as height, width, or arrangement, to ensure a gradual increase in impedance from the motor's ends to the center, thereby achieving uniform airflow distribution and temperature uniformity without altering the total airflow quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional radial ventilation cooling structure with uniform ventilation channel steels is used, then the structure is simple and easy to manufacture, but the airflow distribution through multiple ventilation channels is non-uniform, leading to uneven temperature distribution and excessive local temperature rise
Solution Approach 1:
The patent applies local quality by making different ventilation channel steels have different cross-sectional areas. Specifically, the ventilation channel steels are designed with varying heights in the axial direction, where those farther from the motor center have larger cross-sectional areas and those closer have smaller areas. This non-uniform design compensates for the non-uniform airflow distribution, achieving uniform temperature distribution across different core sections while maintaining manufacturing feasibility.
2Temperature
If the height of ventilation channel steel is increased to improve cooling, then the heat dissipation area increases, but the airflow velocity decreases due to increased impedance, and the temperature uniformity worsens
Solution Approach 1:
The patent applies parameter changes by systematically varying the cross-sectional area parameters of different ventilation channel steels. The height of each ventilation channel steel is adjusted according to its position relative to the motor center, creating a gradient distribution. This parameter optimization ensures that airflow velocity and heat dissipation effectiveness are balanced, achieving uniform temperature distribution without excessive impedance in any single channel.
3Device complexity
If uniform ventilation channels are used throughout the motor, then the device complexity is low, but the maximum temperature value becomes excessively high due to non-uniform airflow distribution
Solution Approach 1:
The patent applies asymmetry by deliberately designing the ventilation channel steels with non-uniform cross-sectional areas distributed asymmetrically relative to the motor center. The ventilation channel steels farther from the center have larger areas while those closer have smaller areas. This asymmetric design compensates for the natural non-uniform airflow distribution in radial ventilation, reducing the maximum temperature value and improving motor reliability while maintaining reasonable 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 solution effectively reduces the maximum temperature value, prevents motor shutdowns, and minimizes thermal deformation of the core bracket, ensuring normal motor operation by enhancing airflow uniformity and heat transfer.
Implementation Method 1
a cold air enters an air gap from an end of a winding and passes through the ventilation channel, and reaches a cavity between two core brackets
Implementation Method 2
the velocity of the airflow is continuously reduced due to the bypassing effect, a local drag and a frictional drag of the ventilation channels, thus the static pressure is increasingly greater and the dynamic pressure is increasingly smaller
Implementation Method 3
the hot air in the cavity is drawn through a pipeline to a heat exchanger outside the motor and converted into a cold air by the heat exchanger
Implementation Method 4
the heat generated by the internal heat source (coils, cores, and etc.) of the motor is distributed uniformly in the axial direction
Implementation Method 5
Radial ventilation cooling is one of commonly used cooling manners for the motor. This cooling manner can increase the heat dissipation area
Data Source
AI summary
A radial ventilation cooling structure for a motor includes at least three core sections, a ventilation channel steel is provided between every two adjacent core sections, and a ventilation channel is formed between the ventilation channel steel and the every two adjacent core sections, and impedances of the multiple ventilation channels are gradually increased in a direction from two ends of the motor to a center of the motor.