Motor Stator Dovetail Mount Structure for Noise Reduction
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Solution Overview
Problem
Conventional permanent-magnet motor stators with single silicon steel lamination configurations produce significant noise due to resonance with the vibration frequencies of applications like ceiling fans, which limits their performance.
Innovation Solution
A combined motor stator design featuring a stator yoke with dovetail-shaped mount structures and stator teeth that are removably mounted, creating an air gap with a specific width ratio, which increases the natural frequency and prevents resonance, allowing for reduced noise and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single silicon steel lamination configuration is used for the stator, then the structure is simple, but the noise level increases due to resonance with vibration frequencies
Solution Approach 1:
The stator is divided into multiple independent silicon steel laminations (at least two layers) that are stacked together. Each lamination can vibrate independently at different frequencies, preventing resonance at any single vibration frequency, thereby reducing noise while maintaining structural simplicity
Solution Approach 2:
The stator uses a composite structure of multiple silicon steel laminations with different thicknesses or material properties. This composite configuration creates a distributed vibration characteristic where the overall stator does not resonate strongly at any single frequency, reducing noise generation
2Volume of moving object
If the air gap width is reduced to improve torque density, then the motor size decreases, but the risk of rotor-stator collision increases
Solution Approach 1:
The stator yoke is designed with elastic deformation capability, allowing it to dynamically adjust during operation. When the rotor approaches too closely, the elastic stator yoke deforms to absorb the impact, preventing hard collision while maintaining a small average air gap for high torque density
Solution Approach 2:
The air gap width is optimized to a specific range (0.3mm to 3mm) based on motor size, and the stator teeth are designed with elastic properties. This parameter optimization allows the system to operate reliably with minimal air gap while the elastic characteristics provide a safety margin against collision
3Ease of manufacture
If the slot opening width is increased to improve winding installation, then the manufacturing ease increases, but the magnetic flux leakage increases reducing efficiency
Solution Approach 1:
The slot opening width is optimized to a specific ratio range (0.6 to 6 times the minimum air gap width). This parameter optimization balances the competing requirements: wide enough to facilitate winding installation but narrow enough to minimize magnetic flux leakage and maintain high motor efficiency
Data Source
AI summary
The disclosure provides a combined motor stator which is configured to be cooperated with a rotor. The combined motor stator includes a stator yoke and a plurality of stator teeth. The stator yoke has a plurality of first mount structures. Each of the plurality of stator teeth has a second mount structure. The second mount structures of the stator teeth are respectively and removably mounted on the first mount structures of the stator yoke. Each of the second mount structures is in a dovetail shape.