Compressed Motor Winding for Efficient Heat Dissipation
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Summary
Problems
Existing electric motors for vehicles, particularly aerial vehicles, face challenges in achieving high efficiency, compactness, and minimizing iron losses, especially at partial loads, while maintaining high part-load efficiency.
Innovation solutions
A motor winding with a high-density multi-conductor wire bundle made of compacted Litz wire, featuring a serpentine configuration with a central portion compressed to maximize conductor density and minimize voids, is used to reduce I2R losses and eddy losses, and is encased in a thermally conductive material for efficient heat dissipation.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If ironless motors are used to eliminate iron losses, then efficiency is improved, but the motor structure becomes more complex and manufacturing difficulty increases
Why choose this principle:
The motor is divided into ironless stator and rotor components, eliminating iron losses in the magnetic circuit. The stator windings are segmented into multiple independent coils that can be optimally positioned without iron constraints, reducing overall system complexity despite the ironless design
Principle concept:
If conventional windings are used in ironless motors, then manufacturing is simpler, but I2R losses and efficiency are higher
Why choose this principle:
The winding parameters are optimized by using multiple fine-stranded conductors instead of single thick conductors. This increases the effective surface area for current distribution, reducing skin effect and proximity effect losses, thereby reducing I2R losses while maintaining manufacturability through standard winding techniques
Application Domain
Data Source
AI summary:
A motor winding with a high-density multi-conductor wire bundle made of compacted Litz wire, featuring a serpentine configuration with a central portion compressed to maximize conductor density and minimize voids, is used to reduce I2R losses and eddy losses, and is encased in a thermally conductive material for efficient heat dissipation.
Abstract
In one possible embodiment, a motor winding is provided having a high density multi-conductor wire bundle with a compacted Litz wire bundle. The compacted Litz wire bundle has a serpentine configuration with a central portion having compacted Litz wire and end turns having non-compacted Litz wire.