Motor Stator Cooling via Centrifugal Spray and Flow Guidance
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Solution Overview
Problem
Existing motor cooling methods, such as water-cooling and refrigerant-based cooling, suffer from low cooling efficiency, complex assembly processes, increased manufacturing costs, and reduced compactness due to the need for separate cooling systems and flow paths, while direct cooling methods with compressible refrigerants face issues with flow path pressure and maintenance costs.
Innovation Solution
A motor design that incorporates a rotary shaft with spray holes for centrifugally spraying a cooling fluid onto the stator, utilizing a simple spray flow path structure without the need for separate openings on the rotor core, allowing for rapid and even cooling of the stator coils and inner coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a water jacket is disposed between motor housing and stator or cooling water flow path is formed in motor housing, then cooling function is provided, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent merges the cooling function with the existing motor housing structure by forming cooling fins on the outer surface of the housing. This eliminates the need for separate water jackets or internal cooling channels, thereby reducing device complexity while maintaining effective cooling of the stator through thermal conduction from the stator to the housing and subsequent heat dissipation via the fins.
Solution Approach 2:
The patent extracts the cooling function from complex internal structures (water jackets, internal flow paths) and implements it through external cooling fins on the motor housing. This simplifies the overall device structure by removing unnecessary internal components while achieving the same cooling objective through a more straightforward external heat dissipation mechanism.
2Temperature
If water jacket is disposed or cooling water flow path is formed, then cooling function is provided, but manufacturing cost of motor housing increases
Solution Approach 1:
The cooling function is merged into the motor housing itself through the addition of cooling fins on the outer surface. This eliminates the need for separate water jackets or complex internal cooling channels, thereby reducing manufacturing steps and costs while achieving effective stator cooling through thermal conduction and external heat dissipation.
3Temperature
If water jacket or cooling water flow path is added, then cooling function is provided, but total volume of motor is increased
Solution Approach 1:
The cooling function is merged with the existing motor housing structure rather than adding separate cooling components. The cooling fins are formed on the outer surface of the housing, utilizing the existing structural volume for heat dissipation. This approach provides effective stator cooling without increasing the overall motor volume, as no additional internal space is required for water jackets or cooling channels.
4Temperature
If compressible refrigerant is sprayed directly into motor, then cooling efficiency is improved, but flow path pressure increases and maintenance expenses increase
Solution Approach 1:
The patent replaces the compressible refrigerant system with a conventional cooling fluid (such as air or water) that is readily available, non-toxic, and does not require special handling or frequent refilling. This substitution eliminates the reliability issues associated with refrigerant leakage and high maintenance expenses while maintaining adequate cooling efficiency through the simplified external finned heat dissipation structure.
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 enables quick and efficient cooling of the entire coil, minimizing electromagnetic performance deterioration and maintaining motor compactness, while reducing maintenance and manufacturing complexities.
Implementation Method 1
a rotary shaft and a rotor and a stator, wherein the rotary shaft includes a spray hole for spraying a cooling fluid and the rotor includes a spray flow path guiding the cooling fluid passing through the spray hole to an inner circumference of the stator
Implementation Method 2
During rotation of the rotary shaft, the cooling fluid may be centrifugally sprayed toward an inner circumference of the stator after sequentially passing through the rotary shaft and the rotor, and the coil constituting the stator may be rapidly cooled by the cooling fluid sprayed in a centrifugal direction from the rotor
Data Source
AI summary
A motor includes a rotary shaft having at least one spray hole for spraying a cooling fluid, a rotor installed on the rotary shaft, and a stator surrounding an outer circumference of the rotor, wherein the rotor includes a plurality of rotor blocks arranged on an outer circumference of the rotary shaft. Each of the rotor blocks may include a magnet installed at a rotor core and a cooling guide may be disposed between a pair of the plurality of rotor blocks and form a spray flow path for guiding a cooling fluid that has passed through the spray hole to be sprayed in a direction toward an inner circumference of the stator.