Stator Winding Cover Structure for Coolant Entry Into Micro Gaps
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Solution Overview
Problem
In dynamoelectric machines, such as motors for hybrid and electric vehicles, the cooling performance is compromised due to coolant not entering the micro gaps between windings, leading to overheating at the crossing parts between the stator core and cover.
Innovation Solution
A filling member, potentially a semi-solid resin with a foaming agent, is placed between the winding and the cover to eliminate the cavity at the crossing part, ensuring coolant can reach the micro gaps between the conducting wires, and a shielding member can be used to prevent the filling member from intruding into these gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a crossing part is formed between stator core and cover, then coolant can flow into the crossing part, but coolant cannot enter the micro gap between windings due to cavity formation, causing cooling performance deterioration
Solution Approach 1:
The patent removes the harmful cavity structure from the crossing part by having the winding directly contact the cover. This extraction of the cavity eliminates the barrier that prevented coolant from reaching the micro gaps between windings, thereby improving cooling performance without adding device complexity.
Solution Approach 2:
The winding acts as an intermediary element that directly contacts both the stator core and the cover, eliminating the need for a separate filling member. This direct contact arrangement allows coolant to flow from the crossing part into the micro gaps between windings, resolving the contradiction between cooling performance and structural complexity.
2Temperature
If filling member is disposed between winding and cover to eliminate cavity, then coolant can enter micro gap between windings, but filling member may intrude into the gap and block coolant flow
Solution Approach 1:
The patent extracts and removes the filling member from the structure, allowing the winding to directly contact the cover. This eliminates the risk of the filling member intruding into and blocking the micro gaps between windings, ensuring reliable coolant flow while maintaining effective cooling of the winding.
3Temperature
If gap between winding side surface and cover is made smaller than gap between conducting wires, then coolant can easily flow between conducting wires, but crossing part cavity must be eliminated
Solution Approach 1:
The patent removes the crossing part cavity by having the winding directly contact the cover, which naturally creates the required small gap between the winding side surface and cover. This eliminates the need for additional gap control structures while ensuring coolant can easily flow into the micro gaps between conducting wires for efficient 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
This configuration allows for improved cooling efficiency by ensuring the coolant effectively enters and circulates through the gaps between the winding conductors, enhancing heat transfer and reducing overheating.
Implementation Method 1
the filling member contains a foaming agent. Accordingly, the foaming agent foams when the filling member is provided in the cavity of the crossing part, so that the cavity of the crossing part can be completely filled
Implementation Method 2
a coolant can reliably enter the gap between the conducting wires that constitute the winding
Data Source
AI summary
A dynamoelectric machine includes: a winding; a stator core including a slot in which the winding is installed; a cover part that covers the stator core; and a crossing part that is a space formed between the cover part and the stator core, wherein, in the crossing part, an end portion of the winding in an axial direction is exposed, and a filling member is disposed between a side surface of the winding in a radial direction and an inner side surface of the cover part in the radial direction.