Magnetic Coupling Repulsive Force Synchronization
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Solution Overview
Problem
Existing magnetic coupling technologies face challenges in achieving efficient non-contact power transmission with minimal noise and contamination risk, particularly in applications where lubricants are involved, and require innovative solutions to optimize magnetic repulsive forces for smooth rotation.
Innovation Solution
A magnetic coupling apparatus and method utilizing a driving member with a plurality of magnets arranged around its periphery, aligned to exert repulsive forces on a driven member with similarly arranged magnets, allowing for smooth rotation without direct contact, and enabling self-starting and synchronization of rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnets are arranged on the circumferences of two circular members to achieve non-contact gear transmission, then contamination risk from lubricants is reduced and noise levels are minimized, but the engagement of the two members may result in mechanical contact under certain conditions
Solution Approach 1:
The patent replaces traditional mechanical gear engagement with magnetic field interaction. Magnets are arranged on the circumferences of driving and driven circular members, creating magnetic repulsion forces that transmit rotational motion without physical contact. This substitution eliminates the need for mechanical contact while maintaining torque transmission, thereby reducing contamination risk and noise.
Solution Approach 2:
The patent optimizes the spacing between magnets on the driving and driven members to maintain a specific gap distance. By carefully controlling this parameter, the system ensures magnetic coupling is strong enough for effective power transmission while preventing mechanical contact. The spacing is adjusted based on magnetic field strength, magnet size, and required torque to achieve reliable non-contact operation.
2Power
If magnets are positioned to exert strong repulsive forces for effective power transmission, then torque transmission is improved, but the force may cause instability or difficulty in starting rotation when the driven member is stationary
Solution Approach 1:
The patent divides the magnetic interaction into multiple discrete magnet pairs around the circumference of the driving and driven members. This segmentation allows the total torque to be distributed across multiple interaction points, reducing the peak force at any single point and enabling smoother startup. The segmented arrangement also provides multiple potential starting positions where magnetic repulsion can initiate rotation.
Solution Approach 2:
The patent utilizes the periodic nature of magnetic repulsion as magnets pass each other during rotation. The alternating pattern of magnetic force application creates a pulsating torque that can overcome static friction and initiate rotation. This periodic magnetic interaction naturally provides the varying force needed to start motion from a stationary position while maintaining stable operation once rotating.
3Reliability
If the driven member is prevented from turning while the driving member operates, then the mechanism is protected from damage through non-contact engagement, but power transmission efficiency is reduced
Solution Approach 1:
The magnetic coupling system automatically adjusts its engagement level based on the operational state. When the driven member is prevented from turning, the magnetic repulsion naturally reduces the effective torque transmission without requiring active control or intervention. The system self-regulates by allowing the magnetic field to slip rather than transmit full torque, protecting the mechanism while minimizing efficiency loss.
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 solution enables efficient, non-contact power transmission with optimized repulsive forces, reducing noise and contamination risks, and allowing for smooth operation even when the driven member is initially stationary, with the ability to transmit power through isolating barriers.
Implementation Method 1
as the driving member rotates, the at least one first magnet approaches one of the second magnets and thus exerts a force upon it which causes the driven member to rotate
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A magnetic coupling apparatus, for transmitting drive from a driving member to a driven member, wherein the driving member has at least one first magnet and the driven member has a plurality of second magnets, and wherein the driving member and the driven member are arranged so that, as the driving member rotates, the at least one first magnet approaches one of the second magnets and thus exerts a force upon it which causes the driven member to rotate. Power is supplied (3) to motor (1), which drives member (2) rotationally (12). Mounted on driving member (2) are cylindrical bar magnets (5). Member (2) rotates (12) close to, but does not contact, driven member (7) and a magnet (5) engages with a magnet (11) located at the circumferences of members (2) and (7) respectively. The driving member and driven member are broadly planar, more preferably circular, disk-like or annular bodies. All magnets (5) and (11) are mounted normally so that (for example) their N poles are close to members (2) and (7) and thus their S poles are at their distal ends. Members (2) and (7) are coplanar and thus magnets (5) and (11) are parallel to each other and approach with the two N poles adjacent and the two S poles adjacent so that a maximum repulsive force (14) is generated causing driven member (7) to rotate (13) away from each magnet (5). When motor (1) is energised, driving member (2) will rotate and bring a magnet (5) towards a magnet (11), which will cause driven member (7) to turn. As member (2) reaches operating speed, the repeated repulsive "kicks" (14) from magnets (5) to magnets (11) will synchronise the rotations (12) and (13); as member (2) carries four magnets (5) and member (7) has eight magnets (11), member (7) will rotate at half the speed of member (2). Member (7) drives an item (8), e.g. a pump, or a generator - thereby generating power - via shaft (9).