Wound Field Motor End Ring Cooling to Reduce Air Gap Drag
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wound field motors experience increased drag loss due to cooling medium flowing into the air gap between the rotor and stator, which affects cooling efficiency.
Innovation Solution
Incorporating an end ring with an axial through hole in the rotor, allowing the cooling medium to be supplied and circulated effectively, reducing drag loss by preventing its entry into the air gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the axial end face of the end ring has no through hole, then the cooling medium can flow freely to cool the coil end, but the cooling medium flows into the air gap between rotor and stator causing increased drag loss
Solution Approach 1:
The axial end face of the end ring is segmented into multiple regions by providing through holes at specific positions. This segmentation allows the cooling medium flow path to be divided, directing cooling flow toward the coil end while preventing overflow into the air gap, thus simultaneously achieving effective cooling and reduced drag loss
Solution Approach 2:
The through hole in the end ring acts as an intermediary structure that mediates between the cooling medium supply and the air gap. It provides a controlled passage for the cooling medium to reach the coil end while the end ring itself serves as a barrier preventing the cooling medium from entering the air gap, resolving the contradiction between cooling effectiveness and drag loss
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
Enhances cooling efficiency of the coil end while minimizing drag loss, thereby improving the overall performance of the wound field motor.
Implementation Method 1
a cooling medium is supplied to an axial end face of the end ring
Implementation Method 2
the cooling medium is less likely to flow into an air gap between the rotor and a stator
Data Source
AI summary
The disclosure relates to a wound field motor. The wound field motor includes a rotor, a coil wound around the rotor, and an end ring attached to a coil end of the coil and supplied with a cooling medium, and at least one through hole is provided in an axial end face of the end ring.