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A magnetic coupling is a device that is capable of transmitting force through space without physical contact. Attractive and repulsive magnetic forces are harnessed to perform work in either a linear or rotary fashion. In its simplest form, a magnetic coupling is comprised of two components: a driver and a follower. The driver is the portion of the mechanism connected to the prime mover (motor). Through magnetic interaction, the follower reacts to the motion of the driver, resulting in a non-contact transmission of mechanical energy. This non-contact power transmission has multiple benefits: Isolation of Components, which minimizes or eliminates mechanical vibrations through magnetic damping and allows for the insertion of a mechanical barrier between the driver and follower to separate environments and allow operation under pressure differentials. High Tolerance of Axial, Radial and Angular Misalignment between the prime mover and load. Allowance of Speed Variation and Regulation between the prime mover and load. We offer three types of custom magnetic couplings: Synchronous (Class 1) Dexter syncronous coaxial coupling Dexter syncronous face-to-face coupling Dexter syncronous linear coaxial coupling Dexter synchronous linear planar coupling As the name implies, this coupling is a synchronous version that inherently results in a 1:1 relationship between the motion of the driver and follower. As taught in grade schools, like magnetic poles (North-North and South-South) repel each other while opposite poles (North-South) attract, synchronous couplings exploit these attractive and repulsive characteristics to produce motion. By placing an array of alternating pole permanent magnets (N-S-N-S) on the driver and an equivalent array of alternating pole permanent magnets on the follower, a coupled magnetic circuit is produced with each North and South pole in the driver linked to each respective South and North pole of the follower. As the driver moves with respect to the follower, the magnet poles start to overlap one another, leading to a push-pull effect and consequent motion. The magnitude of the resultant force depends not only on the amount of overlap, but also on the chosen magnetic materials characteristics and separation distance between the driver and follower. At some displacement, however, the peak force producing capabilities of the coupling are achieved. Displacement beyond this point results in a decoupling. This decoupling manifests itself as a ratcheting action resulting from like magnetic poles is the driver and follower repelling each other. Unlike its mechanical equivalent, however, the decoupling does not, generally, lead to permanent damage; and synchronization is reinitiated at the next magnetic pole coupling point. Pros: Greatest volumetric force density. Cons: Limited to a 1:1 motion ratio Use: Devices that require direct coupling with no slip during operation.
