Flat-Wire Stator Cooling Channels for Higher Heat Absorption
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Solution Overview
Problem
Conventional electric motor stators have limited cooling efficiency due to the design of the winding and coolant flow passages.
Innovation Solution
The stator design includes a coil winding of flat wire conductor, a stator core with slots for housing the coil, and a flow passage part for coolant flow between the slot wall and the coil, where the extension shape of the flow passage part changes along the axial direction of the stator core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a winding is formed in rows for each teeth portion with conventional coolant flow passages, then the stator can be cooled, but the cooling efficiency is limited
Solution Approach 1:
The flow passage part is designed with a variable cross-sectional area along the axial direction, changing from a smaller area at the inlet to a larger area at the outlet. This dynamic geometry optimization allows the coolant flow to adapt along the flow path, improving heat absorption efficiency while maintaining manageable flow resistance.
Solution Approach 2:
The invention changes the geometric parameters of the flow passage by varying the cross-sectional area along the axial direction. This parameter optimization enables the flow passage to achieve better cooling performance by balancing flow resistance and heat transfer efficiency, directly addressing the limited cooling efficiency of conventional designs.
2Productivity
If the flow passage cross-sectional area is increased to improve cooling, then heat absorption improves, but flow resistance increases
Solution Approach 1:
The flow passage employs a dynamic cross-sectional area design that varies along the axial direction rather than maintaining a constant area. This allows the passage to optimize the balance between heat absorption surface area and flow resistance at different positions, achieving improved cooling efficiency without excessive pressure loss.
Solution Approach 2:
The invention addresses the trade-off by introducing variation in the axial dimension, making the cross-sectional area a function of axial position rather than a constant value. This dimensional approach allows simultaneous optimization of heat transfer surface area and flow characteristics along the coolant path.
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 design enhances cooling efficiency by promoting turbulent coolant flow and improving heat absorption from the coil, thereby reducing stator temperature.
Implementation Method 1
improving heat absorption from the coil
Implementation Method 2
coolant flow
Implementation Method 3
promoting turbulent coolant flow
Implementation Method 4
enhances cooling efficiency by promoting turbulent coolant flow and improving heat absorption
Data Source
AI summary
Provided is a stator including a coil of a winding of a flat wire conductor, a stator core including a slot for housing a part of the coil, and a flow passage part through which a coolant flows, provided between a wall part of the slot and an outer surface of the coil facing the wall part. The extension shape of the flow passage part from an inlet to an outlet for the coolant changes along the axial direction of the stator core. The flow passage part is, for example, a concave part formed on the wall part of the slot.