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Electromagnetic hysteresis brake - 0.024 - 210 Nm
AdvantagesThe superior design of these hysteresis devices provide several inherent advantages over magnetic-particle and friction devices. They operate on a frictionless design principle with virtually nor wear. This provides such advantages as: longer expected life, superior torque repeatability, life cycle cost advantages, broad speed range, excellent environmental stability and superior operational smoothness.
Control
In an electrically operated hysteresis brake or clutch, adjustment and control of torque is provided by a field coil. This allows for complete control of torque by adjusting DC current to the field coil. Adjustability from a minimum value (bearing drag) to a maximum value of 15 - 35% above rated torque is possible. In a permanent magnet device, the field coil is replaced by a magnet which provides the precise field strength necessary to produce rated torque without the need of electrical excitation. Since the field strength produced by a permanent magnet is a constant value, the resulting torque will also be constant. Physical realignment of the pole structure will result in limited (but predictable) changes in torque. Special designs utilizing this method are available and will allow for adjustments down to approximately 30 - 40% of rated torque.
Longer expected life
Hysteresis brakes and clutches produce torque strictly through a magnetic air gap, making them distinctly different from mechanical-friction and magnetic particle devices. Because hysteresis devices do not depend on friction or shear forces to produce torque, they do not suffer the problems of wear, particle aging and seal leakage. As a result, hysteresis devices typically have life expectancies many times that of friction and magnetic particle devices.