Motor Oil Path Layout for Stator Winding Heat Dissipation
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Solution Overview
Problem
Existing motor technologies for new energy automobiles face challenges in heat dissipation, particularly at the stator winding end area, leading to increased demagnetization risk of permanent magnets and reduced performance, with existing cooling methods being inefficient and complex.
Innovation Solution
A motor design featuring a housing with a cooling oil channel between the stator core and housing, combined with oil injection rings and end plates that facilitate the injection of cooling oil directly to the stator winding, enhancing heat dissipation through multiple cooling paths and reducing temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional oil-cooling methods (housing oil paths or oil-bath) are used, then cooling is provided to the stator, but the motor volume increases and structure becomes complex
Solution Approach 1:
The cooling system is segmented into multiple independent oil paths: stator oil paths for cooling the stator, rotor oil paths for cooling the rotor, and rotation shaft oil paths for cooling the rotation shaft. Each path is optimized for its specific cooling target, avoiding the need for a single complex cooling system that would increase overall motor volume.
Solution Approach 2:
The oil paths are nested within the existing motor structure components. The stator oil paths are formed within the stator core, the rotor oil paths within the rotor core, and the rotation shaft oil paths within the rotation shaft itself. This nesting approach allows cooling functionality to be integrated without adding external cooling components that would increase motor volume.
2Temperature
If traditional oil-cooling methods are used, then cooling is provided, but the structure becomes complex with additional drainage structures and series-connected oil paths
Solution Approach 1:
The cooling structure is divided into three independent oil path systems (stator, rotor, and rotation shaft), each with its own simplified routing. This segmentation avoids the complexity of series-connected oil paths while providing comprehensive cooling coverage throughout the motor.
Solution Approach 2:
The cooling oil serves multiple functions simultaneously by flowing through different oil paths: it cools the stator, rotor, and rotation shaft in parallel. This multi-functionality eliminates the need for separate cooling systems for each component, reducing overall structural complexity.
3Power
If high power density and high speed are achieved, then motor performance is improved, but heat dissipation capability becomes insufficient leading to high temperatures
Solution Approach 1:
The heat dissipation problem is addressed by segmenting the thermal management system into three independent oil path systems, each targeting a specific heat-generating component (stator, rotor, rotation shaft). This allows simultaneous cooling of all hot spots, enabling the motor to sustain high power density and high speed operation without excessive temperature rise.
Solution Approach 2:
Cooling oil serves as an intermediary heat transfer medium, flowing through multiple oil paths to extract heat from different components. The oil absorbs heat from the stator, rotor, and rotation shaft, and dissipates it through the end covers, enabling effective heat dissipation that supports high power density operation.
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
The design achieves improved heat dissipation performance, reducing temperature rise and enhancing the motor's output, allowing for greater torque and power while maintaining a compact size.
Implementation Method 1
a cooling oil channel being defined between an outer peripheral wall of the stator core and an inner peripheral wall of the housing, the cooling oil channel being in communication with the housing oil inlet... allow cooling oil to be injected from an outer periphery of the stator towards a first end of the stator winding
Implementation Method 2
The design achieves improved heat dissipation performance, reducing temperature rise
Data Source
AI summary
A motor and a vehicle are provided. The motor has a housing, a stator, a first end cove, a second end cover, a first oil injection ring, a rotor, a first end plate, and a second end plate. The rotor includes a rotor core, a rotor oil path formed in the rotor core, a rotor magnet steel, a rotation shaft, and a rotation shaft oil path formed in the rotation shaft. A first oil groove is defined on an inner side surface of the first end plate opposite to the rotor core, and is in communication with the rotation shaft oil path and the rotor oil path, respectively. A first end plate oil outlet is defined in an outer side surface of the first end plate and communicates the first oil groove with an inner cavity of the housing.