Electric Machine Stator with Three Axial Air Channels
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Solution Overview
Problem
Medium-sized electric machines with four axial air channels in the stator reduce the outer surface area available for cooling fins, negatively impacting cooling efficiency and space utilization.
Innovation Solution
The electric machine design features three axial air channels in the stator, increasing the free outer perimeter by at least 10% for more efficient heat transfer, with two lower channels symmetrically positioned in the lower corners and one upper channel on the vertical center axis, allowing for easier installation and cable routing, and directing cooling fins between horizontal and radial directions for enhanced cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four axial air channels are provided in the stator, then the internal air circulation is improved, but the outer surface area available for cooling fins is reduced
Solution Approach 1:
The patent extracts one air channel from the traditional four-channel configuration, reducing the number of air channels in the stator from four to three. This removal of one channel (specifically the upper right channel in the conventional arrangement) increases the available outer surface area for cooling fins while maintaining adequate internal air circulation through the remaining three strategically positioned channels.
2Power
If four axial air channels are provided in the stator, then the cooling capacity is increased, but the space utilization on the outer surface is reduced
Solution Approach 1:
The patent changes the parameter of air channel quantity from four to three, and simultaneously optimizes the positioning of the remaining three channels. The channels are arranged with two in the lower half and one in the upper half of the stator, creating an asymmetric distribution that maximizes the outer surface area while preserving sufficient internal flow paths for effective cooling.
3Reliability
If four axial air channels are provided symmetrically in the stator, then the internal flow distribution is optimized, but the manufacturing complexity and installation difficulty increase
Solution Approach 1:
The patent transitions from a symmetric four-channel arrangement to an asymmetric three-channel configuration. The three channels are positioned with two in the lower portion and one in the upper portion of the stator, creating an asymmetric pattern that simplifies manufacturing by reducing the number of features while maintaining adequate flow distribution through strategic positioning.
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 results in improved cooling efficiency, enabling increased power output and simplified manufacturing due to reduced complexity, with the option to use the upper channel as a cable route and increased flexibility in installation.
Implementation Method 1
A first fan for circulating internal air in a closed air circulation from the first air chamber through the first air channels to the second air chamber and further through the second air channels back to the first air chamber
Implementation Method 2
A second fan for blowing external cooling air from the outside of the electric machine through the third air chamber and from the outlet opening of the third air chamber along the outer surface of the stator
Implementation Method 3
The outer surface of the stator is provided with cooling fins in order to increase the area of the stator that can transfer heat from the stator to the surrounding air
Implementation Method 4
The outer surface of the stator is provided with cooling fins in order to increase the area of the stator that can transfer heat from the stator to the surrounding air
Data Source
AI summary
The electric machine comprises a cylindrical rotor with axial first air channels and a stator with axial second air channels. The outer surface of the stator is provided with cooling fins. There is a first air chamber at a first end of the rotor, a second air chamber and an adjacent third air chamber at a second end of the rotor. A first fan circulates internal air from the first axial air channels to the second air channels in a closed air circulation within the electric machine. A second fan blows external cooling air from the outside of the electric machine through the third air chamber and from the outlet opening of the third air chamber along the outer surface of the stator. The number of second air channels in the stator is three.