Medium Voltage Contactor Latching Rollers for Wear-Resistant Endurance
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Solution Overview
Problem
Existing mechanical latching systems for Medium Voltage contactors face reliability issues due to high friction and wear, particularly in roller bearing systems, which fail to meet the stringent requirements of mechanical endurance certification (250k operating cycles).
Innovation Solution
The proposed accessory device for a Medium Voltage contactor incorporates a latching element with a unique friction reduction mechanism using first and second rollers mounted on case-hardened steel pins, which are securely locked and prevented from rotating to minimize wear and ensure reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If roller bearing systems are used in mechanical latching systems, then friction is reduced, but reliability deteriorates due to wear and failure to meet mechanical endurance certification requirements
Solution Approach 1:
The patent removes the roller bearing component from the latching system entirely. Instead of using rollers that contact the latching surface, the invention employs a latching element with a curved surface that directly engages with the latching surface through pure sliding motion, eliminating the intermediary roller bearing that caused reliability issues
Solution Approach 2:
Rather than reducing friction through rolling contact (roller bearings), the invention inverts the approach by using a curved sliding surface that distributes contact pressure and reduces friction through geometry rather than through rolling motion. The curved surface of the latching element complements the latching surface to create an optimized contact path
2Reliability
If dedicated mechanical latching versions are produced separately in the factory, then latching reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent creates a universal contactor platform where the same basic structure can serve both electrically-latched and mechanically-latched applications. By developing a dedicated mechanical latching accessory that can be added to the standard platform, the invention eliminates the need for manufacturers to produce entirely separate mechanical latching versions, allowing a single platform to fulfill multiple latching requirements
Solution Approach 2:
The mechanical latching function is segmented as a separate accessory device that can be independently added to or removed from the basic contactor platform. This modular approach allows customers to choose the appropriate latching type without requiring different base units, simplifying the overall product architecture
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 solution effectively withstands the high number of operating cycles required for mechanical endurance certification, ensuring high reliability and reducing the risk of mechanical failure, while also being easily manufacturable at competitive costs.
Implementation Method 1
said means for reducing the friction comprising a first and a second roller
Implementation Method 2
first and second pins made of case-hardened steel
Data Source
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AI summary
An accessory device for a Medium Voltage contactor, comprises a latching element 2 movable along an insertion/withdrawal direction between a first operating position in which a movable contact of the contactor is latched and a second resting position in which the movable contact is released. The latching element 2 is provided with means 3 for reducing friction comprising a first 31 and a second roller 32, a supporting structure 21 for the first and second rollers, and a first 41 and a second 42 pin housed in the supporting structure 21 onto which the first 31 and second 32 rollers are respectively mounted free to rotate around their longitudinal axis. First retaining means 5 lock the first and second pins along the direction of the longitudinal axis, and second retaining means 6 block the rotation of the first and second pin with respect to the supporting structure 21.