Magnetic Circuits For Magnetic Coupling

Magnetic circuit for Permanent Magnetic Couplings and Brakes

With rich experiences,Hegaomagtech supplys al range of magnetic circuit for making

Permanent magnetic coupling and brakes.

Disc coupling with axial forces

Here two round or ring magnets are opposing one another, often made anisotropic material. They are magnetised multipolar and sector-patterned over the circular area. With disk couplings high axial forces have to be taken into consideration. The starting speed should be selected in such a way that skipping of the magnetic poles is avoided. The torque is the same for all speeds. It depends on the magnetic material, magnetised surface, air gap and type of magnetisation.

Radial Coupling

An outer ring magnet with its poles magnetised to its inner periphery and a smaller inner ring with an equal number of poles on its outer surface provide the coupling. The starting speed should be selected in such a way that skipping of the magnetic poles is avoided. The torque is the same for all speeds. It depends on the magnetic material, magnetised surface, air gap and number of poles. By means of the torque diagram on page 69 it is possible to determine the torque or the air gap of radial couplings.

Hysteresis Coupling or Hysteresis Brake

A multipole magnet opposes a disc or cup made from socalled hysteresis material (this is a permanent magnetic material with high residual induction and low coercive field strength). Such a coupling applies to high speed. Its torque is constant, contrary to Eddy current couplings.

Eddy Current Coupling and Brake

Also here a multipole permanent magnet opposes a copper disc which is attached to a soft steel backing plate of the same diameter. The torque depends on the speed. Within certain limits the torque rises proportionally with the speed.