Motor Shaft Ground Ring Structure Using Inner Shaft Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mounting structures for shaft ground rings in motors require numerous parts and a complex structure, leading to a larger size and increased manufacturing costs, while also necessitating a longer rotating shaft to accommodate the ground ring.
Innovation Solution
A simplified mounting structure for the shaft ground ring featuring a base plate with a first contact part connected to the motor housing and a second contact part inserted into the rotating shaft, comprising a first protruding piece and multiple second protruding pieces made of carbon fiber, which are spirally coupled to transfer axial currents effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground ring is coupled to the outer circumferential surface of the rotating shaft, then the axial current can be grounded, but the rotating shaft must be longer and the structure becomes more complex
Solution Approach 1:
Instead of coupling the ground ring to the outer circumferential surface of the rotating shaft as in conventional designs, this patent inverts the approach by inserting the second contact part into the hollow interior of the rotating shaft. The ground ring is positioned inside the hollow space, with the second contact part making contact with the inner circumferential surface, thereby achieving the grounding function while eliminating the need for external coupling structures and reducing overall complexity.
2Reliability
If the ground ring is coupled to the outer circumferential surface of the rotating shaft, then the axial current can be grounded, but the rotating shaft length must be increased
Solution Approach 1:
The ground ring is nested within the hollow interior of the rotating shaft. The second contact part is inserted into the hollow space and contacts the inner circumferential surface, while the ground ring itself occupies the internal cavity. This nesting arrangement allows the grounding function to be achieved without extending the external dimensions of the rotating shaft, as the grounding components are accommodated within the existing hollow structure.
3Reliability
If multiple parts are used to manufacture the ground ring, then the grounding function can be achieved, but the manufacturing cost and part count increase
Solution Approach 1:
The ground ring is designed as an integrated component that combines multiple functions into a single part. The first contact part, second contact part, and grounding elements are merged into one unified structure that can be manufactured as a single piece. This eliminates the need for separate plates, carbon fibers, and other components that would otherwise require assembly, thereby reducing the total number of parts and simplifying manufacturing while maintaining the grounding function.
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 new structure reduces the number of parts and manufacturing costs, maintains a compact size, and prevents the need for an extended rotating shaft, thereby enhancing efficiency and cost-effectiveness.
Implementation Method 1
a ground ring including a first contact part electrically connected to the motor housing and a second contact part in contact with the rotating shaft, and transferring an axial current occurring in the rotor to the motor housing
Data Source
AI summary
Provided is a mounting structure of a shaft ground ring of a motor in which a second contact part of the ground ring is inserted into a hole positioned in a rotating shaft, thus making the ground ring be in contact with an inner circumferential surface of the rotating shaft to transfer an axial current occurring in a rotor to a motor housing.