Scalable hysteresis clutch

A hysteresis clutch for transmitting rotational energy in machines, comprising:

• a first rotor rotatable about a rotation axis that comprises a plurality of permanent magnets with a first coercive field strength, the plurality of permanent magnets of the first rotor have a trapezoid cross-section and are arranged with a narrow side radially outward and a wide side radially inward in pockets formed between adjacent pole pieces that are trapezoid-shaped in cross-section;
• a second rotor rotatable about the rotation axis, the second rotor having at least two permanent magnets with a second coercive field strength, the second coercive field strength being lower than the first coercive field strength, the at least two permanent magnets being arranged sequentially in a slip direction, wherein the plurality of permanent magnets of the first rotor comprise a first number of permanent magnets and the at least two permanent magnets of the second rotor comprise a second number of permanent magnets, wherein the first number of the permanent magnets of the first rotor and the second number of the permanent magnets of the second rotor are co-prime with regard to each other and do not have a common integer divisor, wherein (first number of permanent magnets of the first rotor)*(second number of permanent magnets of the second rotor)/180=2N, wherein N is a natural number [N=0, 1, 2, 3 . . . ];
• and
• a truncated cone-shaped or cylindrical air gap located between the first rotor and the second rotor.