Segmented Stator Cooling Channels for EV Motor Heat Dissipation
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Solution Overview
Problem
Current heat dissipation solutions for electric vehicle motors have low cooling efficiency, leading to reduced efficiency and service life, and adversely impacting vehicle performance.
Innovation Solution
A motor design with multiple stator cores and strategically positioned through holes and gaps to facilitate parallel and serial coolant flow channels, enhancing cooling efficiency by minimizing coolant loss and ensuring uniform cooling across the stator cores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat dissipation solutions are used for motor stator cores, then the motor can operate, but cooling efficiency is low leading to excessive temperature rise
Solution Approach 1:
The stator core is divided into multiple segments (first stator core, second stator core, third stator core) with through holes distributed across different segments. This segmentation allows coolant to flow through multiple separate paths simultaneously, increasing the overall heat dissipation surface area and improving cooling efficiency throughout the stator core structure.
Solution Approach 2:
Through holes are positioned at different radial distances from the motor axis in each stator core segment, creating localized cooling zones. The first through hole is positioned closer to the axis while the second through hole is positioned farther away, allowing different regions of the stator core to be cooled according to their specific heat generation characteristics.
2Reliability
If coolant flow channels are increased in number, then cooling efficiency improves, but coolant loss on transmission path increases
Solution Approach 1:
The through holes are nested within the stator core segments which are themselves nested within the motor housing. The first and second through holes in each stator core segment are positioned to utilize the space efficiently within the radial dimension, allowing multiple cooling paths to be packed into the available volume without excessive transmission distance.
3Temperature
If through holes are positioned closer to winding slots, then heat dissipation from windings improves, but structural integrity of stator core may be compromised
Solution Approach 1:
Through holes are strategically positioned at different radial locations within each stator core segment, with the first through hole closer to the axis and the second through hole farther away. This creates localized cooling zones that can be optimized for different thermal conditions while maintaining overall structural integrity through distributed hole placement rather than concentration.
Solution Approach 2:
The stator core is segmented into multiple sections with through holes distributed across different segments rather than concentrated in one location. This segmentation allows heat dissipation to be provided at multiple locations including areas near winding slots, while the distributed arrangement prevents excessive weakening of the stator core structure.
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, extends motor and vehicle service life, and ensures safe and efficient operation by reducing temperature rise and resistance losses.
Implementation Method 1
Coolant is conveyed to the one first through hole and the another first through hole, so that heat dissipation effect on the stator core and the winding slot can be considered
Implementation Method 2
The at least one part of the outer circumferential surface of the second stator core, the two first stator cores, and the one motor housing form one first gap... the coolant conveyed from the inner circumferential surface of the motor housing can flow to one first through hole and another first through hole of each first stator core through the first gap
Implementation Method 3
when the motor is in an operating state, an alternating current applied to the plurality of conducting wires of the motor may cause a resistance loss
Implementation Method 4
An alternating flux generated after the conducting wire is energized further induces a hysteresis loss and an eddy current loss in the plurality of stator cores
Implementation Method 5
An alternating flux generated after the conducting wire is energized further induces a hysteresis loss and an eddy current loss in the plurality of stator cores
Data Source
Figure 1~2
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AI summary
This application provides a motor, a powertrain, and a vehicle, and relates to the field of electric vehicles. The motor includes a motor housing and a plurality of stator cores. Winding slots of each stator core are arranged in a circumferential direction of the motor. The plurality of stator cores include two first stator cores and one second stator core, and the second stator core is arranged between the two first stator cores in an axial direction of the motor. The second stator core, the two first stator cores, and the motor housing form a first gap. One opening of one first through hole and one opening of another first through hole of each first stator core are exposed to the first gap in the axial direction of the motor, and a maximum spacing between the one first through hole and an axis of the motor is less than a minimum spacing between the another first through hole and the axis of the motor in the radial direction of the motor. This application enhances the cooling efficiency of the motor by adjusting flow channels of the plurality of stator cores, thereby ensuring normal traveling of the vehicle.