Stator End-Winding Cooling Channel for Targeted Inner-Radius Heat Removal
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Solution Overview
Problem
Existing cooling systems for electric rotating machines, which rely on gravity to distribute coolant through the stator coil end winding, often fail to effectively target the warmest regions, leading to inefficient cooling and reduced power output.
Innovation Solution
A cooling system with a channel extending around the rotational axis and an inlet at a radially inner portion, directing coolant to the warmest parts of the coil end winding, ensuring precise cooling of the stator coil end winding by guiding it radially outward through the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gravity fed cooling is used to cool the stator coil end winding, then the cooling system is simple in structure, but the coolant flows to regions of least resistance rather than the warmest regions, reducing cooling efficiency
Solution Approach 1:
The patent applies local quality by positioning the coolant inlet at the radially inner portion of the channel where the warmest regions of the coil end winding are located. This ensures that the coolant is directed precisely to the area with highest temperature rather than distributing uniformly or following gravity alone, thereby improving cooling efficiency without significantly increasing system complexity
Solution Approach 2:
The patent transitions from gravity-based axial flow to radially directed flow by positioning the inlet at the radially inner portion. This dimensional change in flow direction allows the coolant to target the warmest regions (which are radially inner due to proximity to the air gap) rather than following the path of least resistance, resolving the contradiction between simple structure and effective cooling
2Ease of manufacture
If the coolant inlet is positioned at the upper portion of the end winding, then the cooling system is easy to implement, but the coolant does not reach the warmest regions of the coil end winding, reducing cooling effectiveness
Solution Approach 1:
The inlet is positioned at the radially inner portion of the channel rather than the upper portion, targeting the specific location where the warmest regions of the coil end winding occur. This localized positioning improves cooling effectiveness while maintaining relatively simple implementation through proper inlet placement in the cooling system design
3Device complexity
If gravity fed cooling is used, then the cooling system requires minimal components, but the operating temperature of the electric machine remains high due to inadequate cooling of the warmest regions
Solution Approach 1:
By positioning the inlet at the radially inner portion to target the warmest regions, the system achieves better cooling effectiveness without adding significant components. This improved cooling reduces operating temperature, thereby increasing the available power output of the electric rotating machine while maintaining minimal system complexity
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 enhances cooling efficiency, improves operating conditions, and increases the available power output of the electric rotating machine by targeting the warmest regions of the coil end winding.
Implementation Method 1
a cooling system for cooling at least a portion of the stator... Since the cooling system comprises the channel extending at least partially around the rotational axis and the at least one inlet to the channel arranged at a radially inner portion of the channel seen along the radial extension, the coolant will enter the channel at a portion thereof where the coil end winding is the warmest during use of the electric rotating machine
Implementation Method 2
Cooling of the end winding is performed by introducing a coolant at an upper portion of the end winding, wherefrom assisted by the guiding elements, gravity will feed the coolant along/through the end winding for cooling thereof
Data Source
AI summary
The disclosure concerns an electric rotating machine, comprising a stator, a rotor arranged to rotate about a rotational axis in relation to the stator, and a cooling system for cooling at least a portion of the stator. The stator comprises a stator core and a stator coil, the stator coil having a coil end winding extending axially beyond the stator core. At least part of the coil end winding is arranged in a channel extending at least partially around the rotational axis. The cooling system comprises the channel and at least one inlet to the channel arranged at a radially inner portion of the channel seen along a radial extension.