Magnetic Timepiece Gear Layout for Higher Torque Transfer
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Solution Overview
Problem
Magnetic gears face limitations in maximum transferable mechanical torque due to parasitic magnetic torque and modulation of magnetic torque during operation, leading to increased energy consumption and reduced torque capacity.
Innovation Solution
Incorporating a third wheel with permanent magnetic poles into the magnetic gear system, arranged at a specific angle and phase shift relative to the first and second wheels, to enhance mechanical torque transfer without slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the distance between the two gears is minimized to increase magnetic interaction, then the maximum transferable mechanical torque is improved, but manufacturing precision requirements worsen due to tolerance problems
Solution Approach 1:
A ferromagnetic element is introduced as an intermediary component between the first and second gears. This element mediates the magnetic interaction, allowing the gears to be positioned at a greater distance while maintaining sufficient magnetic coupling for effective torque transfer, thereby relaxing manufacturing precision requirements for gear spacing
Solution Approach 2:
The invention changes the magnetic field parameters by introducing a ferromagnetic element that concentrates and directs magnetic flux. This parameter change enables effective magnetic interaction at larger gear separations, resolving the contradiction between torque transfer capability and manufacturing precision
2Stability of the object's composition
If the motor torque is increased to overcome parasitic magnetic torque, then the positioning stability is improved, but energy consumption worsens
Solution Approach 1:
The invention converts the harmful parasitic magnetic torque into a beneficial positioning force. The ferromagnetic element is positioned to create a preferred angular position where magnetic attraction is maximized, transforming the parasitic torque that opposed rotation into a stabilizing force that maintains precise positioning without requiring additional motor energy
Solution Approach 2:
The magnetic gear system provides self-positioning through magnetic attraction between the ferromagnetic element and the magnets on the first gear. This self-service mechanism automatically maintains the preferred angular position without requiring external control or additional energy input from the motor
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 significantly increases the maximum transferable mechanical torque, balancing magnetic forces and reducing parasitic torque, allowing for stable and efficient torque transmission with lower motor energy consumption.
Implementation Method 1
The first and second wheels are arranged such that the first magnetic tooth set exhibits a first magnetic coupling with the second magnetic tooth set generated by the first magnetic fluxes, which momentarily polarize, through magnetic attraction, teeth of the second magnetic tooth set
Implementation Method 2
the first magnetic fluxes, which momentarily polarize, through magnetic attraction, teeth of the second magnetic tooth set
Implementation Method 3
The third wheel and the second wheel are arranged such that the third magnetic gear set exhibits a second magnetic coupling with the second magnetic gear set generated by said second magnetic fluxes, which momentarily polarize, through magnetic attraction, teeth of the second magnetic gear set
Implementation Method 4
the second magnetic fluxes, which momentarily polarize, through magnetic attraction, teeth of the second magnetic gear set
Data Source
Figure 1~3A
Figure 3B~4B
Figure 5~6
AI summary
Mechanism (1) comprising a magnetic gear (2) having a first wheel (6A) and a second wheel (6B), the first (6A) wheel being provided with first permanent magnetic poles (7) forming a first magnetic toothing (8), the second wheel (6B) being provided with a second magnetic toothing (10) of soft ferromagnetic material, the first wheel (6A) and the second wheel (6B) being arranged so that the first magnetic toothing (8) has a first magnetic coupling with the second magnetic toothing (10); the magnetic gear (2) further comprising a third wheel (6C) having second permanent magnetic poles (9) which form a third magnetic toothing (12), the third wheel (6C) and the second wheel (6B) being arranged so that the third magnetic toothing (12) has a second magnetic coupling with the second magnetic toothing (10);the magnetic gear (2) being arranged so that, at any given instant, the first and third wheels (6A, 6C) are each positioned angularly in a particular way.;