Rotor Wing Portion Angles for Torque and Noise Reduction
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Solution Overview
Problem
Current motors, such as belt-driven starter and generator motors, face challenges in minimizing torque loss and noise while maintaining adequate cooling, particularly at high speeds.
Innovation Solution
The design incorporates a rotor with a cover featuring wing portions between circular outer and inner boundaries, including specific inlet and outlet angles, and wing groups with varying positions and shapes to enhance airflow and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor rotates at high speed to improve productivity, then the cooling requirement increases, but torque loss and noise increase
Solution Approach 1:
The wing portion is designed with non-uniform blade heights where the inner blades have different heights than the outer blades. This local variation in geometry optimizes the airflow distribution across different radial positions, allowing effective cooling at high speeds while minimizing torque loss and noise generation
2Device complexity
If the wing portion geometry is simplified to reduce device complexity, then manufacturing is easier, but cooling efficiency and noise reduction performance deteriorate
Solution Approach 1:
The wing portion employs different blade heights at different radial positions (inner vs outer blades), creating a complex but optimized geometry that effectively reduces noise while maintaining manufacturability through systematic design patterns
3Object-affected harmful factors
If the wing portion angles are optimized to reduce noise, then noise decreases, but torque loss may increase due to altered airflow patterns
Solution Approach 1:
Different inlet and outlet angles are specified for inner and outer blades of the wing portion. This localized angle optimization balances noise reduction with torque preservation by tailoring the airflow interaction at different radial positions
Solution Approach 2:
The wing portion uses asymmetric blade configurations with different geometries for inner and outer blades. This asymmetry allows independent optimization of noise reduction and torque characteristics at different radial positions, achieving both goals simultaneously
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 minimizes torque loss and noise while ensuring sufficient cooling, as demonstrated by the extended design range of the wing portion and measured noise reduction.
Implementation Method 1
the wing portion includes an inside portion and an outside portion. The inside portion includes a first inlet angle at a first point and a first outlet angle at a second point. The outside portion includes a second inlet angle at the second point and a second outlet angle at a third point.
Data Source
AI summary
The present invention comprises a rotor core and a cover disposed on the rotor core, wherein the cover includes a body part and a plurality of wing parts formed on the body part, the wing part is disposed between an outer boundary, which is a circular curve, and an inner boundary, which is a circular curve, the wing part includes an inner part and an outer part, the inner part forms a first inlet angle at a first point and forms a first outlet angle at a second point, the outer part forms a second inlet angle at a second point and forms a second outlet angle at a third point, the first point is positioned at the inner boundary, the second point is positioned at an intermediate boundary, which is a circular curve, disposed between the outer boundary and the inner boundary, and the third point can be positioned at the outer boundary.