Hysteresis and Matched Hysteresis Brakes HB / MHB Series0 pages

M AGTROL

HB/MHB
Data Sheet

HB Hysteresis Brakes and
MHB Matched Brakes
Features
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Torque up to 3500 oz·in/26 N·m
Speed up to 20,000 rpm
Power up to 2400 W
Available in Metric or English dimensions
Torque independent of speed
Long, maintenance-free life
Operational smoothness
Superior torque repeatability
Broad speed range
Excellent environmental stability

DESCRIPTION
Magtrol pioneered the technology of applying the principles
of hysteresis to meet the critical needs for reliable, smooth
and adjustable torque control. Magtrol’s Hysteresis Brakes
produce torque strictly through a magnetic air gap without the
use of magnetic particles or friction components. This method
of braking provides far superior operating characteristics
(smoother torque, longer life, superior repeatability, high degree
of controllability, and less maintenance and down time) which
make them the preferred choice for precise tension control
during the processing of nearly any material, web or strand.

Matched Brakes
In tension control applications that have multiple webs or
multiple strands, it is very desirable to match the tension of each
web or strand. This is most commonly attained by using a closedloop servo control system which controls current to a braking
device through the use of dancer arms, follower arms and inline tension transducers. The problem with such systems is that
each web or strand must be individually controlled, increasing
the cost and complicating the system with multiple sensors and
power supplies.
Regular Brakes

Transducer

Brake
Power Supply

Transducer

Brake

Power Supply

Brake

Transducer

Brake

Brake

Power Supply

APPLICATIONS
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Matched Brakes

Brake
Power Supply

point—to other brakes of the same model designation.
Regardless of material and manufacturing tolerances, each brake
is matched at the selected match point to within a tolerance of
±1%. The maximum deviation in torque from brake to brake
at any point along their torque/current curve (from 0 torque up
to the selected matched torque point) is less than ±4%* of the
selected matched torque value. With this level of matching,
a system with multiple tension rollers would provide tension
consistency within ±1% if set at the matched point with all
brakes receiving the same current. The matched point can be
any value between 50% and 100% of rated torque, which allows
the brakes to be optimized for specific applications. Unless
otherwise specified, all brakes are matched at 100 rpm.

Brake

Transducer

Brake

To s o l v e t h i s
problem, Magtrol
developed a system
to assure that every
brake of a given
model designation
will be matched—
at a predetermined
torque and current

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Precise control of wire tension during wind, hook and cut
operation of high-speed automated winding machines
Frictionless, non-breakaway force for tensioning
materials during slitting and many other material
processing operations
Load simulation applications for life testing on electric
motors, actuators, small gas engines, gearboxes, and
many other rotating devices and assemblies
Open-loop control for maintaining precise tension
during winding process in transformer and coil winding
operations
Holding of backdriving loads
Ultimate tension control, regardless of control scheme–
dancer roll, follower arm, photo or ultrasonic sensors
Precise load control and programmed repeatability in
fitness machines

*Contact Magtrol for more information

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www.magtrol.com