Stator Assembly Axial Airflow Cooling to Limit Core Deformation
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Solution Overview
Problem
Conventional cooling methods for electrical motors, such as introducing cooling media into the air gap between the stator and rotor, are inadequate in preventing stator expansion and deformation, leading to potential motor failure and environmental noise concerns.
Innovation Solution
A stator assembly with a cooling structure that includes a stator bracket and stator core, featuring a first axial airflow channel between the support enclosure plate and the stator core, and an airflow delivering unit to supply cold airflow for axial direction flow, effectively cooling both radial sides of the stator core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling medium is introduced into the air gap between stator and rotor, then cooling effect is improved, but stator expansion and deformation cannot be completely prevented and wind-induced noise affects natural environment
Solution Approach 1:
The invention divides the cooling function into two independent parts: (1) radial ventilation channels in the stator core for cooling the winding heat source, and (2) axial airflow channels in the stator bracket for cooling the stator core. This segmentation allows each cooling path to be optimized independently, preventing stator expansion while maintaining effective cooling.
Solution Approach 2:
The stator bracket serves as an intermediary cooling component with built-in axial airflow channels. It acts as a heat sink that receives heat from the stator core and dissipates it through axial airflow, thereby cooling the stator core without directly introducing cooling medium into the air gap between stator and rotor.
2Productivity
If high-power fluid machinery is used to force cooling medium into air gap, then cooling capacity is improved, but fluid transmission loss and wind-induced noise increase
Solution Approach 1:
The invention transitions from traditional radial cooling (one dimension) to a combined radial and axial cooling system (two dimensions). By adding axial airflow channels in the stator bracket, heat dissipation occurs in both radial and axial directions, improving cooling capacity without requiring high-power fluid machinery.
3Temperature
If partition wall heat exchanger is used in nacelle, then external cooling is achieved, but resistance loss along fluid transmission path is large and heat exchange rate is restricted
Solution Approach 1:
The cooling channels are built into the stator bracket itself during manufacturing, creating a built-in cooling system. This preliminary integration eliminates the need for external heat exchangers and long fluid transmission paths, thereby reducing resistance loss and improving heat exchange rate.
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 solution reduces thermal expansion and deformation of the stator core, maintains the air gap between the stator and rotor, and protects the magnetic poles from high-temperature damage, thereby extending the service life of the electrical motor.
Implementation Method 1
an airflow delivering unit for supplying a first cold airflow to the first axial airflow channel, to make the first cold airflow flow in the axial direction of the first axial airflow channel
Data Source
AI summary
A stator assembly, an electrical motor having the stator assembly, a wind power generator set and a method for cooling a stator assembly are provided. The stator assembly includes a stator support and a stator core mounted on the stator support, wherein the stator support includes a support enclosure plate, a first axial air flow channel is fonned between the support enclosure plate of the stator support and a radial side surface of the stator core, and the first axial air flow channel is used for receiving a first cold air flow, so that the cold air flow can flow in the axial direction. The stator assembly can introduce a cold air flow from the other side, opposite an air gap, of a stator during the operation of an electrical motor, so that two radial sides of the stator can be cooled at the same time.