Drive Technology
Hysteresis Coupling
The hysteresis coupling transmits its torque through a hysteresis material rather than fixed pole pairing. This delivers an almost constant, speed-independent torque — even in continuous slip.
Operating Principle
A magnet rotor runs opposite a ring of hysteresis material. As it turns, the material is continuously re-magnetised; the resulting magnetic hysteresis generates a constant braking or driving torque that is independent of slip and speed. This makes the hysteresis coupling ideal for soft starting, defined slip torques (e.g. cappers, winders) and torque-limited drives.
Hysteresis vs. Permanent-Magnet Coupling
| Feature | Hysteresis Coupling | Permanent-Magnet Coupling |
|---|---|---|
| Torque curve | Constant, speed-independent | Load-dependent, synchronous |
| Slip | Continuous slip possible | Only up to pull-out |
| Starting behaviour | Soft | Direct (synchronous) |
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