Motor Housing Teeth Support for Stator Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cogging torque, caused by non-uniform magnetic flux changes between stator and rotor teeth, leads to noise and vibration in motors, particularly in precise position control applications, due to misaligned end surfaces of stator teeth.
Innovation Solution
A motor housing design with a teeth support part that protrudes from the inner bottom surface to contact and align the end surfaces of stator teeth, forming a perfect circle, thereby minimizing cogging torque by ensuring uniform assembly and magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stator teeth are assembled without a dedicated support structure, then the manufacturing process is simpler, but the end surfaces of the teeth do not form a perfect circle, causing cogging torque
Solution Approach 1:
The housing is divided into functional sections: a teeth support part with a circular support surface for positioning stator teeth end surfaces, and a bearing support part for mounting bearings. This segmentation allows each part to perform its specific function optimally, ensuring precise tooth alignment while maintaining manufacturing simplicity.
Solution Approach 2:
The circular support surface of the teeth support part automatically guides and positions the stator teeth end surfaces during assembly. The circular geometry inherently ensures that the teeth form a perfect circle when assembled, eliminating the need for additional alignment fixtures or complex positioning mechanisms.
2Object-affected harmful factors
If a complex support structure is used to ensure perfect circular alignment of stator teeth, then cogging torque is reduced, but the manufacturing cost and complexity increase
Solution Approach 1:
The teeth support part and bearing support part are integrated into a single housing structure. The teeth support part protrudes from the bearing support part, combining two functions (supporting stator teeth and mounting bearings) into one component. This merging reduces the number of parts, simplifies manufacturing, and lowers assembly complexity while effectively reducing cogging torque through precise tooth alignment.
3Productivity
If the end surfaces of stator teeth are not perfectly aligned, then the assembly process is faster, but magnetic flux density becomes non-uniform, generating cogging torque and noise
Solution Approach 1:
The circular support surface is pre-formed on the teeth support part during housing manufacturing. This preliminary preparation ensures that when stator teeth are placed on the support surface, they are automatically positioned with their end surfaces forming a perfect circle, eliminating the need for post-assembly alignment adjustments and ensuring uniform magnetic flux density without slowing down the assembly process.
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 motor housing effectively prevents cogging torque generation by aligning stator teeth, reducing noise and vibration, and enhancing motor performance in precise position control applications.
Implementation Method 1
a teeth support part configured to protrude from an inner bottom surface and come in contact with end surfaces of the teeth of the stator to support the end surfaces of the teeth of the stator
Implementation Method 2
Cogging torque, which is non-uniform torque of a stator necessarily generated in a motor using a permanent magnet, refers to radial torque for moving to an equilibrium state, that is, a position at which magnetic energy of the motor is minimal
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a housing including a teeth support part formed to protrude from the inner bottom surface thereof so as to come into contact with the end surfaces of stator teeth and support the same, and thus provides an advantageous effect of preventing the generation of cogging torque, which can occur because of the non-uniform assembly of a stator.