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Tubular Magnetic Linear Couplings – these Tubular types of magnetic couplings are configured so that one member of the coupling is fully nested within the ID of the second member. The two components share a common axis about which both translate.
Axial misalignment – Tolerant.
1.Inherently, linear couplings align axially. As such, any misalignment will lead to the driver pulling the follower into position.
2.Radial misalignment – Tolerant.
a.The amount of tolerance is based on the spacing between the driver and follower. The larger the spacing, the greater the tolerance to radial misalignment. Large radial offsets in closely spaced coupling may lead to excessive radial loads on bearings or shafts.
3.Angular misalignment – Tolerant
a.The amount of tolerance is based on the spacing between the driver and follower. The larger the spacing, the greater the tolerance to angular misalignment.
Linear machines must consider end effects and have low efficiency. However, they do not need to convert rotary motion to linear motion. Linear machines have higher dynamic performance, improved reliability, and a reduced power loss. In addition tubular linear machines are very attractive compared with flat linear machines, because the former produce high magnetic force owing to a high permanent magnet (PM) coefficient of utilization and do not have end turn effects. Tubular-type linear magnetic couplings (TLMCs) are used to transmit the magnetic force from actuators to loads without any mechanical contact. Analyzing TLMCs with a Halbach array magnetized PM magnetic force is very important because this force acts as an overload protection in the machines. Therefore this paper predicts
the magnetic force characteristics according to design parameters such as iron core thickness, inner PM thickness to -outer PM thickness ratio, PM segment ratio, and pole numbers. To acquire magnetic force analysis results of TLMCs, we used an analytical force calculation. An analytical method for magnetic fields is performed by using magnetic vector potential as well as Poisson and Laplace equations. Then we calculated the magnetic force using the Maxwell stress tensor. The analysis results were compared with finite element method (FEM) results.
Similar to a torque couple, a Linear Coupler relies on magnetic interaction between two coupler halves. As in the torque coupler, usually one Half is the driver and the other Half is the follower. Linear couplers are often simpler to design and to construct when compared to torque couplers because the movement is linear and non-rotational. Tubular Magnetic Linear Couplings
A linear coupler can be as simple as two magnets or comprised of engineered arrays containing multiple magnets of various configurations. The operational gap between the coupler’s halves, the required coupling force, and the operating environment are the prime design variables.
There are many variations of Linear Couplers and the fundamental similarity is that the coupler’s “Halves” are “linked” through a gap. One “Half” can propagate the other “Half” without contact. All of the common and unique designs for Linear Couplers try to minimize cost, increase performance, and make use of the application specific geometry. Tubular Magnetic Linear Couplings
One common style of Linear Couplers are simple magnets on a backing-plate. The magnets are sized based on the gap and desired force to be transferred. (As previously discussed the larger the gap, the less magnetic flux linking will occur and this results in a lower coupler force.) The simplest design is two magnets alternating NORTH – SOUTH. The backing-plate connects the non-working faces of the magnet and increased the effective filed in the gap and therefore the coupling force. asynchronous magnetic coupling