For
many years Magtrol has designed Hysteresis Brakes with large
bores, and without a shaft or bearings. These brakes are used
for superior tension control for helical wrapping, braiding
and other feed through applications. Magtrol Large Bore Brakes
are used in machines for manufacturing cable, wire, fiber
optic cable, rope and tape, among others. Magtrol Large Bore
Brakes provide smooth, repeatable torque, largely independent
of speed. Maximum speeds up to 8000 rpm are available.
These brakesconsist of two primary parts: a pole/case assembly
and a rotor. The pole/case assembly is usually mounted in
a stationary position within the machine, while the rotor
is shaft mounted concentrically within the pole/case assembly.
The pole/case assembly and rotor are available are manufactured
in standard bore sizes and hole patterns. Variations to the
standard dimensions can be made based on customer requirements.
Certain modifications to the brake, such as a larger bore
dimension, may impact its performance ratings.
Additional options available include rotor
mounting flanges, power supplies, torque-current curves and
other coil voltages. Contact
Magtrol for more information.
| Operating Considerations |
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The pole/case assembly and the rotor
are shipped as separate items, and it is the responsibility
of the machine designer to assure proper alignment and concentricity
of the mating brake parts in the final assembly. The mounting
structure for these parts must be such that concentricity between
the Rotor O.D. (outside diameter) and the Case I.D. (inside
diameter), which forms the outer segment of the air gap, does
not exceed 0.015 mm. Additionally, the run out of the rotor
face should not exceed 0.025 mm.
At the standard bore diameters, actual brake torque at rated
current will normally exceed the minimum guaranteed values.
Larger bore diameters can be provided, however, reductions in
performance will result as bore diameters are increased. Any
modification to a large bore brake should be reviewed in detail
with Magtrol before ordering. |
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