Electric Motor Cooling via Segmented Airflow Channels
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Solution Overview
Problem
Existing electric motors experience temperature increases due to operation, leading to increased stator winding resistance and reduced efficiency, as well as potential bearing degradation and lifespan reduction.
Innovation Solution
The design incorporates a stator and rotor configuration with air gaps and strategically positioned holes to facilitate airflow, using a fan to draw air through the motor, which suppresses temperature rise and reduces bearing heat transfer, while a protruding part prevents magnetic powder entry into the air gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor operates continuously, then power output is maintained, but temperature increases causing winding resistance increase and efficiency reduction
Solution Approach 1:
The motor structure is segmented into distinct cooling channels including stator cooling holes and rotor cooling holes, allowing separate airflow paths for stator and rotor cooling. This segmentation enables targeted heat removal from different heat-generating components while maintaining continuous power operation
Solution Approach 2:
A forced convection cooling system using pneumatic principles is implemented, where air is circulated through the motor via fans and cooling holes. The airflow carries heat away from the stator and rotor windings, maintaining lower operating temperatures during continuous power output without compromising motor performance
2Temperature
If cooling air flows through the motor, then temperature is suppressed, but magnetic powder may enter the air gap reducing motor performance
Solution Approach 1:
A protective film is introduced as an intermediary layer on the stator and rotor surfaces facing the air gap. This film acts as a barrier that prevents magnetic powder particles in the cooling airflow from adhering to the magnetic components, thereby maintaining motor performance while allowing continuous cooling operation
Solution Approach 2:
The harmful effect of magnetic powder entry is extracted and isolated by applying the protective film specifically to critical surfaces. This selective protection removes the vulnerability of the air gap to contamination while preserving the beneficial cooling airflow through the motor
3Power
If air gaps are reduced for better magnetic coupling, then motor efficiency improves, but heat transfer to bearings increases reducing lifespan
Solution Approach 1:
The cooling system is segmented into distinct pathways that separate the magnetic air gap region from the bearing support regions. Cooling holes are strategically positioned to direct airflow away from bearing areas, allowing tight air gaps for magnetic coupling while preventing heat transfer to bearings through dedicated cooling channels
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 effectively cools the motor, reducing stator winding resistance, improving efficiency, and extending bearing lifespan by maintaining lower temperatures and preventing dust and magnetic powder entry.
Implementation Method 1
a fan (60) which is fixed to the rotor fixing part (15) to draw air from the rotor hole (14)
Implementation Method 2
the air gap between the shaft and the stator functions as an adiabatic part, so that heat generated in the stator is hardly transferred to the shaft
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention is an electric motor capable of suppressing a temperature increase. A shaft extends along an axial direction. A rotor (10) is provided farther away from the shaft (30) than the stator (20) in a radial direction of the shaft (30). A stator fixing part (25) is fixed to the shaft (30) and also fixed to the stator (20). A rotor fixing part (15) faces the stator fixing part (25) and the stator (20) with an air gap therebetween in the axial direction, is rotatably fixed to the shaft (30), and is also fixed to the rotor (10). A rotor hole (14) which passes through the rotor fixing part (15) to be communicated with the air gap is formed in the rotor fixing part (15), and a stator hole (28) which passes the stator fixing part (25) to be communicated with the rotor hole (14) with the air gap therebetween is formed in the stator fixing part (25).