Planar Linear Magnetic Coupler – Planar types of magnetic couplings are configured so that the magnetic flux is transferred about the flat end faces of the magnetic assembly. The two components are attracted to one and other and typically require additional thrust bearing support for proper integration.
1.Planar (direction of motion) misalignment – Tolerant.
a.Inherently, linear couplings align axially. As such, any misalignment will lead to the driver pulling the follower into position.
2.Planar (perpendicular to direction of motion) misalignment – Very tolerant
a.Designs can be produced to constrain 2-DOF if required
3.Angular misalignment –Tolerant
a.The amount of angular misalignment depends on the air gap between the two members
Magnetic couplings are widely used in various industrial applications because they can transmit magnetic force without any mechanical contact. In addition, linear couplings have many advantages. For example, they do not need to convert rotary motion to linear motion. This paper shows an analytical analysis of tubular type linear magnetic couplings (TLMCs) with a Halbach array magnetized permanent magnet (PM). An analytical method for magnetic fields owing to PMs is performed by using magnetic vector potential as well as Poisson and Laplace equations. Then, the magnetic force is calculated by using the Maxwell stress tensor. The analytical analysis results were compared with finite element method (FEM) results. In addition, we predicted the magnetic force characteristic according to design parameters such as the iron core thickness, inner PM thickness to -outer PM thickness ratio, PM segment ratio of the axial magnetized PM segment and radial magnetized PM segment, and various pole numbers.
Parametric analysis, Halbach array, magnetic coupling, analytical method
Theory of Operation
In the simplest form, magnets are able to exert a force over a distance. Whether by inducing a field in a ferromagnetic material or interacting with another magnet, a magnet can exert a force without touching. The magnet’s magnetic field is the mechanism for this non-contact force.
When two magnets are attracting through a gap, are restrained from engaging, and are otherwise at equilibrium, then no force components are created other than those trying to bring the magnet together. If one of the magnets is shifted, then the magnetic field “bends” and “sideways” force components are established to maintain the equilibrium. (This force acts to oppose the motion of the shifted magnet and to propagate the second magnet so that the system can remain in or achieve equilibrium again.)
Additionally, there were “sideways” magnetic field components and there-by sideways force components before the shift, but there were equal number and hence the system was at equilibrium. When one magnet was shifted the symmetry of the field was skewed and the sideways field components became unbalanced resulting in a net force to drive the system back to equilibrium. tubular magnetic linear couplings
These sideways force components are the mechanism which allows for Linear and Torque Couplers. While more prevalent, Torque Couplers are really Linear Couplers, but with rotational motion. The “Linear Force” is the force acting tangential to the radius of the system. The summation of the effective tangential acting forces for all magnet elements in the system multiplied by the radius of the system results in the effective torque.
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