Electric Rotating Machine Cooling Mechanism for Tilt Stability
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Solution Overview
Problem
Existing cooling mechanisms for electric rotating machines fail to ensure effective coolant distribution to coil ends when the machine is tilted, leading to inadequate cooling due to the direction of tilt.
Innovation Solution
The implementation of a coolant channel system with a flow separator that splits the coolant flow into two streams, directing them to different portions of the coil end, and additional extensions that facilitate capillary action for enhanced cooling, ensuring coolant reaches both inner and outer surfaces of the coil end even when the machine is tilted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the coolant outlets are located just above the outer circumferential surface of the coil end, then the structure is simplified, but the coolant fails to reach the inner and outer surfaces of the coil end opposed in the axial direction
Solution Approach 1:
The cooling system is segmented into multiple outlet groups positioned at different locations: top outlets for the outer circumferential surface, bottom outlets for the inner circumferential surface, and side outlets for axial surfaces. This segmentation ensures comprehensive cooling coverage without requiring complex internal channel structures within the coolant channel itself
Solution Approach 2:
The invention introduces intermediate coolant distribution paths including gravity-assisted flow channels and capillary channels that mediate between the simple outlet positions and the target cooling surfaces. These intermediaries enable coolant to reach distant surfaces (inner and outer axial surfaces) from simple outlet locations, maintaining structural simplicity while achieving comprehensive cooling
2Device complexity
If the coolant is supplied to the central top of the arc-shaped coolant channel, then the supply mechanism is simplified, but the coolant fails to drain from both ends onto the coil end when the machine is tilted in the axis-turning direction
Solution Approach 1:
The coolant supply system is segmented into a central supply point and multiple distributed collection points (outlets) at various positions along the coolant channel. This segmentation allows the simple central supply mechanism to effectively distribute coolant to multiple drain points, ensuring that at least some outlets remain functional under any tilt condition
Solution Approach 2:
The invention distributes outlets across multiple spatial dimensions (top, bottom, and side surfaces) rather than relying on a single drainage path. This multi-dimensional outlet configuration ensures that gravity-assisted drainage can occur from at least one outlet regardless of tilt direction, maintaining reliability while keeping the supply mechanism simple
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 design ensures comprehensive cooling of the coil ends by maintaining coolant distribution stability and effectiveness across various tilt orientations, preventing cooling failures and enhancing heat absorption.
Implementation Method 1
a flow separator disposed in the flow path, the flow separator working to separate a flow of the coolant into at least two streams
Implementation Method 2
additional extensions that facilitate capillary action for enhanced cooling, ensuring coolant reaches both inner and outer surfaces of the coil end
Implementation Method 3
The coolant drops from the cylindrical guides and flows downward along the outer circumferential surface of the coil end and, thus, hardly reaches an outer or an inner surfaces of the coil end which are opposed in the axial direction of the coil end, which may result in a lack in cooling the coil end as a whole
Data Source
AI summary
An electric rotating machine is provided which includes a stator in which a coil is so wound as to have an coil end and a coolant channel. The coolant channel has defined therein a flow path through which coolant flows and a flow separator disposed in the flow path and a first and a second coolant outlet. The flow separator works to separate a flow of the coolant into at least a first and a second coolant streams. The first coolant outlet communicates with the first coolant stream, while the second coolant outlet communicates with the second coolant stream. The first and second coolant outlets drain the coolant to different portions of the coil end, thereby cooling almost the whole of the coil end even when the electric rotating machine is tilted undesirably.