Permanentmagnetic Hysteresis Brakes and Couplings enable frictionless torque transmission and are therefore wear-free.

Two segmented permanently excited ring magnets (outer disks) enclose a (middle) hysteresis disk. If the same poles are opposite each other, a maximum magnetic field acts on the hysteresis disk. This causes a line of force to flow in the circumferential direction within the hysteresis disk, which generates the maximum torque. If unequal poles are opposite each other, the lowest magnetic field acts on the hysteresis disk and the line of force flows directly through it. This produces the minimum torque. The torque can be infinitely adjusted by changing the angle of the pole overlap and, as there are no contacting surfaces, the setting is maintained indefinitely.

The hysteresis brakes are designed for a temperature range of -30 to +85 °C.

Applications:

Permanentmagnetic Hysteresis Brakes and Couplings are used by the industry to regulate web tension for films, paper rolls etc. and can also be controlled via laser sensors for diameter measurement.

They are used in the automotive industry, for example, to test servomotors for load and continuous performance.  Stepper motors for seat adjustment, air conditioning systems, steering systems, window lifters, tailgate locks, headlight range adjustment, windshield wipers with permanent or electric hysteresis brakes are tested.
They are also used in the printing industry and in gear manufacturing to test gear wheels under continuous load.
These brakes are also used in the two-wheeler industry to test chains, e-bike motors, sprockets, etc.
Manufacturers of power saws, circular saws, household appliances such as mixers, washing machines, cordless screwdrivers, drills, jigsaws, turbines, wind turbines, etc. use hysteresis brakes to simulate loads.