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    HB series standard hysteresis brake

    Introduction:
    HB series standard Hysteresis brakes are categorized into single ended shaft and double ended shafts, and are being widely used for torque loading and power absorption in test benches, actuators, etc., as well as tension control with wire, cable, ropes, threads, paper and foils at take-up and payoff equipment. Can be used as start coupling for rpm speed up control and as overload protection or braking against backlash, as well as use for the simulation loading for sport equipment. These brakes are noiseless, frictionless and wear free in their operation. Torque is independent from rpm speed. Torque is infinitely adjustable within each brake’s range of operation.

HB series standard hysteresis brake
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Operating principles

  The hysteresis effect in magnetism is applied to torque control by the use of two basic components -a reticulated pole structure and a special steel rotor/shaft assembly - fitted together but not in physical contact. Until the pole structure is energized, the drag cup can spin freely on its shaft bearings. When a magnetizing force from a field coil is applied to the pole structure, the air gap becomes a flux field and the rotor is magnetically restrained, providing a braking or clutching action between the pole structure and rotor.
The superior design of these hysteresis devices provides several inherent advantages over magnetic-particle and friction devices. They operate on a frictionless design principle with virtually no 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.

In a Current Controlled Electric Hysteresis Brake, 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. These brakes utilize the same operating principle as our permanent magnet hysteresis brakes, however the magnets are replaced with a field coil which provides the precise magnetic field strength necessary to provide the rated torque.
Residual Magnetic

The residual magnetic force will be generated at the time of the excitation current suddenly changes to less than 50% of the initial value and the rotor does not rotate, and torque will be fluctuated during operation. And the effective way of avoiding the torque fluctuation are:
1. Manually rotate the stator and rotor respectively and reduce the excitation current concurrently
2. Reduce the excitation current gradually prior to stopping the running equipment
3. Turn off the low excitation current(The relative speed between stator and rotor is minimum 100rpm)prior to stopping the running equipment.
 
Selection Reference:

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