Electric Motor Cooling Channel and Plenum Design
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Solution Overview
Problem
Electric motor stators with copper end windings generate excessive heat during operation, which can damage the motor or reduce its performance, and existing cooling methods are inadequate to effectively manage this heat.
Innovation Solution
A cover with a defined channel and plenum is secured to the stator, directing cooling fluid around the windings through a network of openings and outlets to efficiently dissipate heat, with the plenum extending over at least 20% of the outer perimeter to ensure comprehensive cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If cooling fluid is directed through a single channel, then the structure is simple, but the cooling coverage is insufficient
Solution Approach 1:
The cooling system is segmented into multiple independent channels (first cooling channel, second cooling channel, third cooling channel) that can be distributed throughout the stator structure. This segmentation allows the cooling fluid to reach multiple regions simultaneously, increasing overall cooling coverage without requiring a single complex centralized channel system.
Solution Approach 2:
The cooling channels are arranged in multiple spatial dimensions and orientations within the stator, extending along different peripheries and surfaces. This multi-dimensional arrangement maximizes the cooling coverage area by utilizing the three-dimensional space available in the stator structure, rather than relying on a single linear path.
2Loss of energy
If cooling fluid flow rate is increased, then heat dissipation improves, but energy consumption increases
Solution Approach 1:
The cooling system divides the total cooling flow into multiple separate channels, allowing the pump to operate at lower individual flow rates while maintaining effective cooling across all channels. This segmentation reduces the energy required to move the cooling fluid compared to forcing a single high-flow channel.
Solution Approach 2:
Different cooling channels can be optimized with varying flow rates and cooling intensities based on local heat generation patterns in different stator regions. This localized approach ensures efficient heat dissipation where needed while minimizing unnecessary energy consumption in cooler regions.
3Reliability
If cooling channels are added throughout the stator, then cooling effectiveness improves, but manufacturing complexity increases
Solution Approach 1:
The cooling channels are merged with the existing stator structural components, such as the stator core and end windings, rather than being added as separate external elements. This integration allows the cooling channels to be formed during the same manufacturing processes used to create the stator structure, reducing overall manufacturing complexity.
Solution Approach 2:
The stator structure serves multiple functions: it provides mechanical support for the windings, maintains magnetic circuit integrity, and simultaneously houses the cooling channels. This multi-functionality eliminates the need for separate cooling system components, simplifying manufacturing while maintaining effective cooling.
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 effectively directs cooling fluid to distribute heat away from the windings, preventing damage and maintaining motor performance by ensuring efficient heat dissipation, even under high load conditions.
Implementation Method 1
The channel extends along the end periphery and is configured to direct cooling fluid about the windings
Implementation Method 2
directing cooling fluid into a plenum, and directing cooling fluid from the plenum through at least two openings into a channel that extends along the end periphery such that the cooling fluid is distributed to the end windings
Data Source
AI summary
An electric motor system includes a stator and a cover. The stator has windings that are affixed to an end periphery of the stator. The cover is secured to stator and defines a channel and a plenum. The channel extends along the end periphery and is configured to direct cooling fluid about the windings. The plenum extends over at least twenty percent of an outer perimeter of the cover and is configured to direct cooling fluid into the channel.