Stator Winding Head Cooling With Ring Enclosure to Protect the Air Gap
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Solution Overview
Problem
Electric machines, particularly in electromobility, face challenges in efficiently dissipating heat from winding heads to prevent damage and enhance energy density, as conventional cooling methods like free convection are inadequate, leading to potential short circuits and reduced operating ranges.
Innovation Solution
A dynamoelectric machine design featuring ring elements with inlet nozzles that radially and axially encase winding heads, directing a cooling fluid to prevent it from entering the air gap between the rotor and stator, and incorporating a collecting channel and drainage system to ensure effective heat dissipation without the need for seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fluid is sprayed onto the winding heads to dissipate heat, then the heat dissipation efficiency is improved, but the cooling fluid may enter the air gap and cause harmful effects
Solution Approach 1:
The patent introduces a sealing ring as an intermediary element positioned between the cooling fluid spray zone and the air gap. This sealing ring acts as a barrier that allows the cooling fluid to effectively cool the winding heads while preventing the fluid from contaminating the air gap between rotor and stator, thus resolving the contradiction between heat dissipation efficiency and harmful fluid intrusion
2Reliability
If the maximum permissible temperature is exceeded in the winding heads, then the insulation can be destroyed and short circuits can occur, but reducing the operating temperature limits the energy density and performance
Solution Approach 1:
The patent applies local quality by implementing targeted cooling specifically at the winding heads where heat generation is most intense. The cooling system is localized to the critical hot spots rather than cooling the entire machine, allowing maximum operating temperature and energy density in non-critical areas while maintaining insulation integrity in the critical winding head regions
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 enhances heat dissipation from winding heads, preventing overheating and extending the operating range of electric machines by maintaining the cooling fluid within a controlled annular space, thereby increasing energy density and preventing short circuits.
Implementation Method 1
a cooling fluid, which is, for example, a cooling liquid, in particular an oil, cannot get into the air gap
Implementation Method 2
make the heat transfer from the stator laminated core to the cooling medium as efficient as possible
Data Source
AI summary
A dynamoelectric machine having a stator having a substantially cylindrical or hollow-cylindrical stator body, a rotor arranged substantially coaxially with the stator, two ring elements, of which in each case one is arranged on each end face of the stator body. Each ring element has inlet nozzles through which a cooling fluid can be sprayed onto the winding heads of the stator. Penetration of the cooling fluid into the air gap of the machine is prevented in that each ring element radially and axially encloses the winding heads arranged on the respective end face, such that the winding heads are encased in an annular space bounded by the respective ring element and the respective end side of the stator body.