Radial Cooling Channel Stator Core for High Power Density Motors
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Solution Overview
Problem
Conventional heat dissipation methods for motor stators are inefficient, failing to meet the high heat dissipation requirements imposed by increasing motor power density.
Innovation Solution
A stator silicon steel sheet with radial flow channels that form inner and outer cooling channels, allowing coolant to flow between them, enhancing heat dissipation through a stator core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional heat dissipation methods are used for motor stators, then the structure is simple, but the heat dissipation efficiency is insufficient
Solution Approach 1:
The cooling system is segmented into multiple independent cooling holes (first cooling holes and second cooling holes) distributed at different radial positions, with radial flow channels connecting them. This segmentation allows coolant to flow through multiple separate paths simultaneously, increasing the total heat dissipation surface area and improving heat dissipation efficiency while maintaining manageable structural complexity
Solution Approach 2:
The invention transitions from conventional single-dimension cooling to multi-dimensional cooling by creating radial flow channels that connect cooling holes at different radial distances from the center. This adds a radial dimension to the cooling path, enabling coolant to flow both axially through cooling holes and radially through connecting channels, thereby enhancing heat dissipation efficiency without excessive structural complexity
2Power
If motor power density is increased, then power performance is improved, but heat dissipation requirements become more stringent
Solution Approach 1:
The invention employs hydraulic cooling by introducing coolant through multiple cooling holes and radial flow channels to directly remove heat from the stator core. This hydraulic cooling system efficiently handles the increased heat generation from high power density motors by providing multiple coolant flow paths that increase the overall heat transfer capacity
Solution Approach 2:
The invention changes the cooling system parameters by increasing the number of cooling holes, distributing them at different radial positions, and creating radial flow channels between them. These parameter changes enhance the heat dissipation capacity to match the increased power density, allowing the motor to operate at higher power levels without excessive temperature rise
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
Improves cooling efficiency and heat dissipation performance of the motor, increasing power performance and service life of the motor and powertrain.
Implementation Method 1
Each radial flow channel is configured to communicate with one first cooling hole and one second cooling hole, and the first cooling hole and the second cooling hole are adjacently arranged in the radial direction of the stator silicon steel sheet
Implementation Method 2
Coolant may be fed into the first cooling hole, and the coolant may also be fed into the second cooling hole, to form two cooling channels in a radial direction of the stator core
Implementation Method 3
The first cooling hole may communicate with the second cooling hole through the radial flow channel, so that the coolant can flow between the first cooling hole and the second cooling hole
Data Source
Figure 1~2a
Figure 2b~3
Figure 4a~4b
AI summary
This application relates to the field of motor technologies, and in particular, to a stator silicon steel sheet with a radial flow channel, a stator core, a motor, a powertrain, and an electric vehicle. The stator silicon steel sheet with the radial flow channel includes a plurality of first cooling holes, a plurality of second cooling holes, and at least one radial flow channel. In an axial direction of the stator silicon steel sheet, each first cooling hole and each second cooling hole penetrate the stator silicon steel sheet. In a circumferential direction of the stator silicon steel sheet, the plurality of first cooling holes are spaced from each other, and the plurality of second cooling holes are spaced from each other. In a radial direction of the stator silicon steel sheet, a distance between each first cooling hole and a center of the stator silicon steel sheet is greater than a distance between each second cooling hole and the center of the stator silicon steel sheet, and the second cooling hole is closer to the center of the stator silicon steel sheet than the first cooling hole. Each radial flow channel is configured to communicate with one first cooling hole and one second cooling hole, and the first cooling hole and the second cooling hole are adjacently arranged in the radial direction of the stator silicon steel sheet. The radial flow channel can enhance heat dissipation performance of the motor.