Magnetic Coupling with Ferromagnetic Diverting Element
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Concentric ring couplings are difficult and costly to manufacture in miniaturized forms due to thin-walled hollow cylindrical parts, while disc couplings experience a disproportionate decline in torque transmission with reduced dimensions, making them inefficient for applications requiring compact and high-torque transmission.
Innovation Solution
Incorporating a partially ferromagnetic diverting element radially outside the permanent magnets, which can be shaped like a cup or hollow cylinder, to bundle magnetic field lines and increase magnetic force, allowing for compact dimensions with torque transmission comparable to concentric ring couplings and maintaining the magnetized volume of disc couplings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If concentric ring couplings are miniaturized, then compact dimensions are achieved, but manufacturing becomes difficult and cost-intensive due to thin-walled hollow cylindrical parts
Solution Approach 1:
The coupling is divided into two separate coupling parts (drive-side and output-side) that can be manufactured independently and then assembled. This segmentation allows each part to be produced using standard manufacturing processes without requiring complex thin-walled hollow cylindrical structures, thereby reducing manufacturing difficulty and cost while achieving compact dimensions.
Solution Approach 2:
The invention transitions from the concentric ring configuration to a disc coupling configuration where the coupling parts are arranged axially adjacent to each other rather than concentrically. This dimensional change allows for compact design while using simpler, easier-to-manufacture disc-shaped components instead of thin-walled hollow cylinders.
2Volume of moving object
If disc couplings are reduced in size, then compact dimensions are achieved, but torque transmission experiences a disproportional decline
Solution Approach 1:
The coupling parts use composite construction combining permanent magnets with ferromagnetic diverting elements. The permanent magnets generate the magnetic field while the ferromagnetic diverting elements concentrate and guide the magnetic flux, creating a composite structure that maintains high torque transmission capability in compact dimensions.
Solution Approach 2:
The ferromagnetic diverting elements act as intermediaries that concentrate and guide the magnetic flux between the permanent magnets of the two coupling parts. This intermediary function enhances the magnetic coupling efficiency and torque transmission capability, allowing compact disc couplings to achieve torque transmission comparable to larger concentric ring couplings.
3Force
If permanent magnets are oriented with magnetisation perpendicular to the axis of rotation, then magnetic field lines are bundled and magnetic force is increased, but manufacturing complexity increases
Solution Approach 1:
The invention changes the magnetization orientation parameter from axial to radial (perpendicular to the axis of rotation). This parameter change bundles the magnetic field lines and increases the magnetic force between coupling parts. The ferromagnetic diverting elements further enhance this effect by concentrating the radial magnetic flux, achieving high magnetic force with practical manufacturing complexity.
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 a more economical and efficient torque transmission in compact magnetic couplings, reducing axial extension and radial forces on bearings, while allowing for higher torque transmission similar to concentric ring couplings, making it suitable for applications like implantable medical devices.
Implementation Method 1
a drive-side coupling part (5) having a drive-side permanent magnet (10) and wherein an output-side coupling part (6) has an output-side permanent magnet (7)
Implementation Method 2
one part of which (8) is disposed radially outside of the opposite permanent magnet (7). By means of the diverting element, magnetic field lines extending radially from the permanent magnets are bundled, and due to the ferromagnetic material of the diverting element the magnetic force between the coupling parts is further increased
Data Source
AI summary
Disclosed is a magnetic coupling for transmitting torque along an axis of rotation, comprising two coupling parts which can be rotated relative to each other, wherein a drive-side coupling part has a drive-side permanent magnet and wherein an output-side coupling part has an output-side permanent magnet that lies opposite and at a distance from the drive-side permanent magnet along the axis of rotation. One of the coupling parts comprises a diverting element which is at least partially ferromagnetic and is non-rotatably connected to the permanent magnet of said coupling part and one part of the diverting element is disposed radially outside the opposite permanent magnet.