Motor Thrust Bearing Uneven Surface Segmentation
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Solution Overview
Problem
Conventional motors with thrust bearings experience significant friction between the rotor and thrust bearing due to a large interface area, affecting the smooth and stable operation of the motor.
Innovation Solution
A motor design featuring a rotating member with a shaft and limiting portion, where at least one of the contact surfaces between the rotating member and the thrust bearing is an uneven surface, providing point or line contact to reduce the interface area and friction, including features like annular or dot protrusions and arc surfaces for optimal contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large interface area is used between the rotating member and thrust bearing, then the thrust bearing can support larger axial loads, but friction increases significantly affecting motor operation stability
Solution Approach 1:
The contact surface is segmented into multiple discrete contact points or lines through protrusions (ridges, dots, or arc surfaces) instead of a continuous large-area contact. This segmentation reduces the total contact area while maintaining load support capability through distributed contact points, thereby reducing friction and improving operation stability.
2Force
If a large interface area is used between the rotating member and thrust bearing, then load distribution is improved, but friction and energy loss increase
Solution Approach 1:
The contact interface is divided into multiple segmented protrusions that distribute the load across discrete points or lines. This segmentation maintains load distribution capability while minimizing the total contact area, thereby reducing frictional energy loss compared to a continuous large-area contact surface.
3Reliability
If point contact or line contact is used instead of large area contact, then friction is reduced improving rotation smoothness, but contact pressure increases
Solution Approach 1:
The contact surface is segmented into multiple protrusions that distribute contact pressure across numerous discrete points or lines. While each individual contact point experiences higher pressure, the cumulative effect of multiple distributed contact points maintains rotation smoothness by reducing total friction while the segmentation prevents excessive stress concentration at any single point.
Data Source
AI summary
A motor includes a bearing sleeve arranged with a base and having opposite opening and sealing ends; a stator coupled with the base or bearing sleeve; and a rotating member disposed in the bearing sleeve and including a shaft and a limiting portion adjacent to the sealing end. A first end of the shaft connects with the limiting portion, a second end of the shaft has a coupling portion, and the limiting portion has a first contact surface. A thrust bearing is arranged between the shaft and the bearing sleeve and has a second contact surface facing the first contact surface. At least one of the first and second contact surfaces is an uneven surface. A hub is coupled with the coupling portion of the shaft and has a permanent magnet corresponding to the stator.