Oil-Cooled Motor Stator Cooling Structure for Full Oil Coverage
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Solution Overview
Problem
Existing oil cooled motors have poor heat dissipation performance due to limited oil distribution and low flow speed, with the current design only allowing a small amount of oil to be distributed to the stator core, resulting in incomplete coverage and inefficient heat dissipation.
Innovation Solution
The oil cooled motor heat dissipation structure features oil spray parts arranged at both ends of the stator core, forming a cooling medium flow chamber with the case, and includes inclined oil spray channels that directly spray cooling medium to the stator end winding, utilizing a series oil way to connect stator core and end winding heat dissipation, with varying oil spray hole distances and widths to enhance flow speed and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a parallel oil way structure is used with oil spray pipes at the top of the stator and end of the winding, then the motor structure is simplified, but the heat dissipation performance deteriorates due to limited oil distribution quantity
Solution Approach 1:
The patent inverts the conventional parallel oil way structure into a series structure. The oil spray part at the top of the stator core is connected to the oil spray part at the end of the winding through the cooling medium flow chamber, forming a series connection where cooling medium flows sequentially through both areas, maximizing heat dissipation while maintaining structural simplicity
Solution Approach 2:
The cooling medium flow chamber serves multiple functions: it acts as a flow path for the series oil way structure, provides additional cooling surface area, and enables the cooling medium to contact both the stator core and end winding effectively, improving overall heat dissipation efficiency
2Device complexity
If cooling oil is sprayed to the top of the stator core and allowed to flow down under gravity, then the structure is simple, but the flow speed is low and coverage is incomplete
Solution Approach 1:
The patent introduces an inclined oil spray channel that dynamically directs the cooling medium flow toward the stator end winding. This inclined structure utilizes gravity more effectively while adding a directional component that increases flow speed and ensures complete coverage of the target area
Solution Approach 2:
The oil spray channel is arranged in an inclined manner, adding a dimensional aspect to the cooling medium flow path. This inclined arrangement transforms the purely vertical gravity-driven flow into a directed flow that covers both the top surface and extends toward the end winding, improving coverage area
3Device complexity
If only a small amount of cooling oil is distributed to the oil way at the top of the stator, then the structure is simple, but the heat dissipation performance is poor due to incomplete surface coverage
Solution Approach 1:
The patent segments the cooling system into multiple oil spray parts (at the top of the stator core and at the end of the winding) connected in series. This segmentation allows the limited cooling medium to be distributed more effectively across different heat-generating areas, increasing total coverage area without requiring a complex distribution network
Solution Approach 2:
The series connection of oil spray parts creates a continuous cooling path where the cooling medium flows sequentially through multiple heat dissipation zones. This continuous flow ensures that the entire surface area requiring cooling is covered systematically, maximizing the useful cooling action across the complete coverage area
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 improves heat dissipation efficiency by ensuring maximum flow rate utilization and complete surface contact, enhancing the heat dissipation performance of the motor through increased flow speed and area coverage, omitting oil pipes and connectors for a simpler structure.
Implementation Method 1
the outer surface of the stator core, the case and the oil spray parts construct a cooling medium flow chamber, so as to facilitate the flowing of a cooling medium in the cooling medium flow chamber along outer surface of the stator core
Implementation Method 2
The oil spray channel is arranged in a manner of inclining from an end face of the oil spray part to a direction of a stator end winding, so that the cooling medium is sprayed to the stator end winding from the cooling medium flow chamber along oil spray channel
Data Source
AI summary
Some embodiments of the present disclosure provide an oil cooled motor heat dissipation structure and a motor. The oil cooled motor heat dissipation structure includes oil spray parts which are arranged at two ends of a stator core. An outside diameter of the oil spray part is not less than an outside diameter of the stator core, and the oil spray part is in contact with a case, an outer surface of the stator core, the case and the oil spray parts construct a cooling medium flow chamber, so as to facilitate the flowing of a cooling medium in the cooling medium flow chamber along the outer surface of the stator core. The oil spray part is provided with an oil spray channel. One end of the oil spray channel is communicated with the cooling medium flow chamber, the other end is communicated with a chamber inside the motor.