Slotless Electric Motor PCM Thermal Buffer for Peak Load Capability
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Solution Overview
Problem
Electric motors in emerging transportation applications face challenges in meeting peak power requirements while minimizing size and weight, as traditional designs compromise thermal capacity and transient load capabilities due to thermal constraints.
Innovation Solution
The integration of phase change materials (PCMs) within the stator of a slotless electric motor for enhanced thermal management, allowing for direct thermal communication with motor coils and simplified manufacturing, while minimizing motor dimensions and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If motor power density is increased to reduce size and weight, then the mass of active material is reduced, but thermal capacity is reduced, thereby reducing short-term overload capability
Solution Approach 1:
The patent utilizes phase change material (PCM) that transitions between solid and liquid phases to store and release thermal energy. The PCM absorbs heat during phase change from solid to liquid, providing thermal capacity without adding significant mass, thereby enabling short-term overload capability while maintaining reduced motor weight.
Solution Approach 2:
The patent introduces phase change material as an intermediary thermal management component between the motor coils and the external environment. The PCM acts as a thermal buffer that mediates heat transfer, absorbing excess heat during high-power operation and releasing it during normal operation, thus decoupling the motor's power density from its thermal capacity.
2Temperature
If phase change material is integrated into motor coils, then thermal capacity is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the motor structure into distinct functional zones: motor coils, phase change material chambers, and heat dissipation pathways. This segmentation allows each component to be manufactured and assembled separately, simplifying the integration of PCM into existing motor manufacturing processes while maintaining thermal performance.
Solution Approach 2:
The patent extracts the phase change material from the coil structure itself and places it in separate chambers adjacent to the coils. This extraction approach allows the coils to be manufactured using traditional methods while the PCM is independently contained and integrated, reducing manufacturing complexity compared to embedding PCM directly within coil windings.
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 high power density and thermal mass, allowing for increased transient load capabilities and efficient thermal reserve monitoring, optimizing motor performance in applications like aircraft propulsion where size and weight are critical.
Implementation Method 1
An improved thermal capacity with reduced motor mass can be obtained by using a phase change material (PCM), a category of material that stores/dissipates a large amount of energy during the phase change process.
Implementation Method 2
providing cooling of motor coils with a phase change material (PCM) conducting heat through the coil sidewalls
Data Source
AI summary
A slotless electric motor provides a phase change material that may communicate thermally through the sides of coils directly attached to the outer circumference of the central stator. A control system modeling the motor allows effective operation for short durations.