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Linear Magnetic Couplings

/Linear Magnetic Couplings
  • linear magnetic couplings
  • permanent-magnet-coupling
  • linear-coupler-tube-style

Linear Magnetic Couplings, Linear Magnetic Couplers, Permanent Magnet Linear Couplings, Synchronous Magnetic Linear Couplers, Tubular Magnetic Coupling, Planar Magnetic Coupling

Linear Magnetic Couplings are simpler compared with torque couplers. It can be two magnets or comprised of engineered arrays containing multiple magnets of various configurations. The required coupling force and the operating environment are the prime design variables.

Linear Magnetic Couplings Part No.:  HSLNMC
Material: NdFeB, SmCo, AlNiCo
Shape: Custom
Dimension: Custom
Grade: Custom

Tubular – these types of permanent 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.
Inherently, linear couplings align axially. As such, any misalignment will lead to the driver pulling the follower into position.
Radial misalignment – Tolerant.
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.
Angular misalignment – Tolerant
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.

Planar – these 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.
Planar (direction of motion) misalignment – Tolerant.
Inherently, linear couplings align axially. As such, any misalignment will lead to the driver pulling the follower into position.
Planar (perpendicular to direction of motion) misalignment – Very tolerant
Designs can be produced to constrain 2-DOF if required
Angular misalignment –Tolerant
The amount of angular misalignment depends on the air gap between the two members

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.

Linear Magnetic Couplings 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 Magnetic Couplings 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.

One common style of Linear Magnetic Couplings 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.

The magnet’s cross-sectional area, the magnetic length, the spacing between the magnets, the backing-plate alloy, and the backing-plate thickness are all variables in the design and need to be optimized for the needs of the particular application.

The two magnets per “Coupler Half” system can be expanded to three or more magnets per half to add additional coupling force. The constraint is the available “room” and cost.

The second most common Linear Magnetic Couplings style uses “Steel Poles” as the working areas and is used extensively in “Round” applications, especially when pipes are employed.

Ideally “radially” orientated magnets would be used for this geometry, but this orientation is very challenging to produce, is very expensive, and has limits on the OR and IR of the magnets. Linear motor magnets by HSMAG.

Magnet Magnetization Geometry Page

To circumvent this limitation, axially orientated magnets are used in conjunction with steel poles, and this facilitates 360° coupling. The magnets are “sandwiched” by the steel poles and the magnet-steel pole pattern alternates to the required axial length. (The axial length of the coupler halves is the primary driver for the coupling force.)

Similar to a Torque coupler, this style of Linear Coupler has Inner and Outer array halves; however, there is no rotational coupling capacity.

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