Rotor Coil Cooling via Interpole Air Guide
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Solution Overview
Problem
Industry standards limit rotor winding temperatures, and exceeding these limits can lead to premature failure due to insulating material limitations, necessitating improved thermal management.
Innovation Solution
A coil support assembly with an air guide is positioned in the interpole region of a rotor, utilizing upper and lower support wedges and scoops to direct cooling air across the coils, enhancing ventilation and heat transfer through the rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct cooling air is provided to rotor coils, then thermal performance is improved, but device complexity increases
Solution Approach 1:
The coil support assembly performs multiple functions: it mechanically supports the rotor coils while simultaneously serving as a cooling air distribution system. The support wedges and air guide structure work together to both hold the coils in position and direct cooling airflow across the coil surfaces, eliminating the need for separate cooling apparatus.
Solution Approach 2:
The cooling system utilizes the existing rotor rotation and ambient cooling air to provide self-cooling. The air guide structure passively directs airflow generated by rotor rotation across the coils, and the support wedges automatically position themselves to maintain optimal air gaps and cooling channels without requiring external control mechanisms.
2Productivity
If higher power densities are achieved through improved ventilation, then productivity increases, but temperature control becomes more challenging
Solution Approach 1:
The air guide structure creates localized cooling zones at critical heat generation points on the rotor coils. By directing cooling air specifically across the coil surfaces through defined air gaps and channels, the system provides targeted thermal management where it is most needed, enabling higher power densities without compromising temperature control.
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 configuration improves thermal performance, allowing for higher power densities while meeting industry standards and material limits, resulting in a more cost-effective product.
Implementation Method 1
direct cooling air to the rotor to improve the thermal performance
Implementation Method 2
improve the ventilation of the rotor, higher power densities can be achieved
Data Source
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AI summary
Systems and methods according to various embodiments direct air flow to rotor coils (50, 52). This cooling air increases heat transfer from the coils to improve the thermal performance of the rotor. In one arrangement, the rotor comprises an upstream pole (40) and a downstream pole (42). The upstream pole (40) has an upstream medial portion (80), an upstream coil (50) disposed around the upstream medial portion (80), and an upstream tip (90). The downstream pole (42) has a downstream medial portion (82), a downstream coil (52) around the downstream medial portion (82), and a downstream tip (92). An interpole region (110) is interdisposed between the upstream pole (40) and the downstream pole (42). An upstream scoop (152) is positioned adjacent a downstream end of the upstream tip (90). The upstream scoop (152) is configured to direct air flow around the downstream end of the upstream tip (90) and into the interpole region (110).