Electromagnetic Machine Cold-Plate Isolation for High Power Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed transportation systems face challenges in achieving high efficiency and power density due to internal stress and heat production in electromagnetic machines, which can lead to increased power consumption and magnetic property degradation.
Innovation Solution
An electromagnetic machine with a thermally and mechanically isolated permanent magnet and independently controllable windings, using a reciprocal retention mechanism and cold plate to reduce thermal and mechanical stress, and a ferromagnetic body structure to manage magnetic flux and force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electromagnetic machine operates at high power density, then the force generation capability is improved, but internal heat production increases causing magnetic property degradation
Solution Approach 1:
The electromagnetic machine is divided into thermally isolated segments: the permanent magnet assembly is separated from the winding assembly through mechanical and thermal isolation. This segmentation allows the magnet to operate in a cooler environment while the windings can dissipate heat independently, enabling high power density operation without degrading magnetic properties.
Solution Approach 2:
A thermal barrier or isolation structure is introduced as an intermediary between the permanent magnet and the windings. This intermediary prevents direct thermal coupling, allowing the magnet to be mechanically supported while thermally isolated from the heat-generating windings, thus resolving the contradiction between power density and temperature control.
2Force
If the electromagnetic machine generates high force, then the transportation system efficiency is improved, but internal stress increases causing mechanical degradation
Solution Approach 1:
The force-generating components are segmented into distinct assemblies: the magnet assembly and the winding assembly. This segmentation allows stress to be localized and managed independently in each assembly, preventing stress concentration that would occur in integrated designs, thereby enabling high force generation with reduced internal stress.
Solution Approach 2:
The permanent magnet is extracted and mechanically isolated from the stress-prone winding structure. By separating the magnet from the force-generation interface, the magnet is protected from mechanical stress while the windings continue to generate the required force, resolving the contradiction between force generation and stress management.
3Speed
If the electromagnetic machine is designed for high speed operation, then the transportation speed is improved, but heat dissipation becomes more difficult reducing reliability
Solution Approach 1:
The thermal management system is segmented with dedicated cooling paths for the magnet assembly and winding assembly. This segmentation enables independent thermal management optimized for high-speed operation, where the windings can be actively cooled while the magnet maintains stable temperature, preserving reliability at high speeds.
Solution Approach 2:
A thermal isolation intermediary is introduced between the magnet and windings, which also serves as a thermal management interface. This intermediary enables differentiated cooling strategies for each component, allowing the system to maintain reliability during high-speed operation by preventing heat accumulation in the temperature-sensitive magnet while permitting heat dissipation from the 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
The solution reduces power consumption and minimizes magnetic property degradation, enhancing the efficiency and reliability of high-speed transportation systems by effectively managing thermal and mechanical stresses within the electromagnetic machine.
Implementation Method 1
an electromagnetic machine for generating force. Internal stress and heat production in such an electromagnetic machine may be problematic
Implementation Method 2
Each of the ferromagnetic bodies may be thermally and/or mechanically isolated from one another and/or from a permanent magnet of the electromagnetic machine
Data Source
AI summary
An electromagnetic machine for generating force is provided. The electromagnetic machine includes a magnet having opposing sides extending along a longitudinal axis. The electromagnetic machine includes a pair of ferromagnetic bodies respectively extending along the opposing sides of the magnet, and along the longitudinal axis, each of the ferromagnetic bodies comprising: a back-iron portion; and a pole portion extending from the back-iron portion. The magnet and the ferromagnetic bodies include reciprocal retention devices at the opposing sides along the longitudinal axis. The electromagnetic machine includes electrical windings around respective pole portions of the ferromagnetic bodies, the electrical windings around the respective pole portions being independently controllable. The electromagnetic machine includes at least one cold plate configured to thermally isolate the magnet from the electrical windings.