Electrical Machine Cooling via Stator Yoke Clearances
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Solution Overview
Problem
Existing electrical machines face inefficiencies in heat removal due to indirect cooling methods requiring additional components like oil pumps and heat exchangers, and radial flux machines with windings wound around stator teeth lack effective thermal management.
Innovation Solution
The electrical machine design features a stator with radial stator teeth and a yoke that creates clearances for a thermally conductive coolant guide, allowing direct heat dissipation from winding heads to a coolant guide and housing, enhancing thermal conductivity and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If indirect cooling methods are used to remove heat from electrical machines, then heat dissipation is achieved, but additional components like oil pumps and heat exchangers are required
Solution Approach 1:
The housing is designed to serve dual functions: as the structural enclosure and as a heat dissipation component. The housing incorporates cooling fins and is in thermal contact with the stator, allowing it to directly dissipate heat without requiring separate cooling components like oil pumps or heat exchangers.
Solution Approach 2:
The cooling system utilizes the housing itself as the heat sink, eliminating the need for external cooling components. The housing's thermal contact with the stator and its exposure to ambient air enable self-cooling through natural convection and radiation.
2Ease of manufacture
If radial flux machine stators with windings wound around stator teeth are used, then structural design is simplified, but effective thermal management is lacking
Solution Approach 1:
The housing is designed with enhanced thermal contact specifically at the stator regions that generate the most heat. The cooling fins are strategically positioned to maximize heat dissipation from the winding areas, providing localized thermal management where it is most needed.
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 achieves efficient heat removal with a cost-effective and functional structure by directly dissipating heat from winding heads through the coolant guide and housing, improving thermal management and reducing the need for additional cooling components.
Implementation Method 1
A coolant guide (20) which is in thermally conductive contact with at least one axial lateral surface (16) of the yoke (10)
Implementation Method 2
the stator (4) is in interlocking and thermally conductive contact with the inner side (3) of the housing (2)
Data Source
AI summary
An electrical motor includes a housing, a stator seated in the housing, wherein the stator includes a plurality of stator teeth which extend in the radial direction toward the rotor, a yoke that connects the stator teeth is arranged in such a way that a plurality of first clearances are formed between the housing and the yoke and a plurality of second clearances are formed between the yoke and a free end of the stator teeth, and a coolant guide in contact with at least one axial lateral surface of the yoke, wherein the stator is in interlocking contact with the inner side of the housing.