Pole Retainer Cooling Manifold for Axial Flux Motor Heat Removal
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Solution Overview
Problem
Current cooling techniques for Toroidal-Stator Axial Flux Permanent Magnet (AFPM) motors are inefficient due to the lack of effective heat transfer mechanisms, particularly in high-speed applications where mechanical stress and thermal performance are critical.
Innovation Solution
The pole retention hardware of the electric motor is designed to function as a cooling manifold, allowing coolant to be located adjacent to heat sources such as coil conductors and pole laminations, thereby enhancing heat removal through channels and fluid transfer ducts integrated into the pole retainer system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct oil cooling is used to cool the electric coils, then heat removal efficiency is improved, but frictional and windage losses increase due to fluid density and dynamic viscosity
Solution Approach 1:
The cooling system extracts the cooling function from the traditional oil medium and implements it through a dedicated coolant circulation system with channels in the pole retainers, separating the cooling function from the magnetic circuit medium
Solution Approach 2:
The pole retainer is given multiple functions: it provides mechanical retention of the pole and simultaneously serves as a cooling manifold with integrated coolant channels, eliminating the need for separate cooling components
2Temperature
If the back iron is used for cooling as a heat transfer medium, then heat transfer capability is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The pole retainer performs dual functions as both a mechanical retention component and a cooling manifold with integrated coolant channels, eliminating the need for separate cooling structures
Solution Approach 2:
The pole retainer serves itself by incorporating cooling channels directly into its structure, allowing it to cool the pole and coil assembly without requiring additional dedicated cooling components
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 approach enables efficient heat dissipation, allowing the motor to operate at higher speeds with reduced mechanical stress and thermal limitations, thereby improving overall performance and efficiency.
Implementation Method 1
absorbing, by the cooling fluid, heat generated by one or more first coils one or more first permanent magnets attached to the first pole
Implementation Method 2
routing a cooling fluid from a manifold in a hub through a first channel extending through a first pole retainer
Data Source
AI summary
The disclosed apparatus, system, and techniques described herein allow pole retention hardware of the electric motor to also function as a cooling manifold for removing heat generated by the electrical coils. A pole retainer apparatus can include a pole retainer for retaining a pole to a hub. The pole retainer can include a proximal end mounted on the hub and a distal end. The pole retainer can include a channel extending through the pole retainer from the proximal end of the pole retainer mounted on the hub to the distal end of the pole retainer. The apparatus can include a mount located at the distal end of the pole retainer and configured to retain the pole on the hub. The apparatus can include a fluid transfer duct connected to the mount. The cooling system can be employed on TORUS Axial Flux Permanent Magnet motors, and various other motor designs.