Rotor Assembly Air-Gap Layout With Integrated Liquid Cooling
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Solution Overview
Problem
Conventional electric machines face challenges in optimizing the air gap size between the rotor and stator, which affects electrical characteristics, leading to increased harmonic distortion and heating issues, while also requiring careful consideration to balance magnetic energy storage and reluctance.
Innovation Solution
The design incorporates a rotor core with slotted and non-slotted portions to create a varying air gap width, improving magnetic flux distribution and reducing total harmonic distortion, along with a liquid cooling system to enhance thermal management and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the air gap size is optimized for electrical characteristics, then harmonic distortion increases, but if the air gap size is optimized for magnetic energy storage, then reluctance increases
Solution Approach 1:
The rotor core incorporates both slotted portions and non-slotted portions, creating local variations in air gap width. The slotted portions have reduced air gap width for improved electrical characteristics, while non-slotted portions maintain larger air gap for reduced reluctance. This local differentiation resolves the contradiction by allowing different regions to optimize for different requirements simultaneously.
2Productivity
If the rotor operates at higher speed for increased power generation, then thermal management becomes more challenging, but if cooling systems are added, then device complexity increases
Solution Approach 1:
The cooling system is merged with the rotor core structure itself. Cooling channels are integrated directly into the rotor core, eliminating the need for separate external cooling systems. This integration resolves the contradiction by providing effective thermal management for high-speed operation while avoiding the complexity of additional cooling apparatus.
Solution Approach 2:
The patent employs liquid coolant flowing through integrated channels to remove heat from the rotor core. This hydraulic cooling approach provides efficient thermal management capability, enabling higher operating speeds and improved power generation efficiency without requiring complex mechanical cooling systems.
3Manufacturing precision
If slotted and non-slotted portions are used to vary air gap width, then magnetic flux distribution improves, but manufacturing complexity increases
Solution Approach 1:
The rotor core is segmented into distinct slotted and non-slotted portions along its circumferential length. This segmentation allows for improved magnetic flux distribution by creating varying air gap widths, while the modular nature of the segmentation makes the manufacturing process more manageable through standardized production techniques for each segment type.
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 reduces total harmonic distortion and improves thermal conduction, allowing for higher speed operation and increased power generation efficiency without increasing generator size, while maintaining reliability and stability.
Implementation Method 1
improves thermal conduction, allowing for higher speed operation
Implementation Method 2
The rotor can be formed of a ferromagnetic material to channel magnetic flux
Implementation Method 3
an electrical motor converts electrical energy into mechanical energy. Conversely, an electrical generator converts mechanical energy into electrical energy
Data Source
AI summary
A rotor assembly for an electric machine is disclosed. The rotor core has a cylindrical body defining an outwardly facing peripheral surface comprising a slotted portion including a set of slots defined by a set of rotor teeth projecting outwardly from the peripheral surface. Each rotor tooth comprises a respective first distal tip and a respective first radial length extending radially from a center point of the rotor core to the first distal tip. The peripheral surface further comprises a non-slotted portion defining a respective second radial length, extending radially from the center point of the rotor core to the outwardly facing peripheral surface. The first radial length is less than the second radial length.