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Matched Hysteresis
Brakes |
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 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
closed
loop servo control system which controls current to a braking
device through the use
of dancer arms, follower arms and in-line
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.
Magtrol has developed a system to assure that every brake
of a given model designation will
be matched, at a predetermined
torque and current point, to other brakes of the same model
designation regardless of material and manufacturing tolerances.
Each brake will be
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)
will be 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. |
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| Typical Brakes vs. Matched Brakes |
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| Matched Brakes |
| All single Magtrol Hysteresis Brakes can be matched.
When ordering, replace the HB in the Hysteresis Brake model
number with MHB. For Large Bore Brakes, LB is replaced with
MLB. |
| EXAMPLE: |
Standard |
Matched |
| HB-140-2 |
MHB-140-2 |
| LB-250M-2 |
MLB-250M-2 |
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| Specifications - English |
| For complete technical specifications and a general dimension drawing, download the data sheet.
For detailed dimension drawings… |
 |
|
Click on the  icon in the table below.
A PDF document will open in a new window.
(Adobe Acrobat Reader 7.0, or later, is required.) |
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NOTE:
Brakes will be matched at rated torque unless lower
match point
(to 50% of rated) is requested.
Unless otherwise specified, all brakes are matched at 100 rpm. |
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| Model |
Minimum Torque
at Rated Current |
Rated
Current |
Maximum
Speed |
Kinetic Power* |
View
Drawing |
| 5 Minutes |
Continuous |
| oz·in |
mA |
rpm |
W |
W |
PDF |
| MHB-2.5 |
2.5 |
98 |
20,000 |
20 |
7 |
see data sheet |
| MHB-10 |
10.0 |
133 |
20,000 |
45 |
12 |
|
| MHB-38 |
38.0 |
250 |
15,000 |
90 |
25 |
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| MHB-50 |
50.0 |
253 |
15,000 |
90 |
23 |
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| MHB-140 |
140.0 |
253 |
12,000 |
300 |
75 |
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| MHB-250 |
250.0 |
270 |
10,000 |
450 |
110 |
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| MHB-450 |
450.0 |
442 |
8,000 |
670 |
160 |
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| MHB-750 |
750.0 |
383 |
7,000 |
1,000 |
200 |
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| MHB-1750 |
1,750.0 |
500 |
6,000 |
1,200 |
350 |
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This icon also indicates that a 3D Solid Model is available for this unit.
Contact Magtrol Customer Service. |
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| Specifications - Metric |
| For complete technical specifications and a general dimension drawing, download the data sheet.
For detailed dimension drawings… |
|
|
Click on the icon in the table below.
A PDF document will open in a new window.
(Adobe Acrobat Reader 7.0, or later, is required.) |
| |
NOTE:
Brakes will be matched at rated torque unless lower
match point
(to 50% of rated) is requested.
Unless otherwise specified, all brakes are matched at 100 rpm. |
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| Model |
Minimum Torque
at Rated Current |
Rated
Current |
Voltage* |
Maximum
Speed |
Kinetic Power** |
View
Drawing |
| 5 Minutes |
Continuous |
| N·m |
mA |
VDC |
rpm |
W |
W |
PDF |
| MHB-3M-2 |
0.02 |
145 |
25.0 |
20,000 |
20 |
5 |
see data sheet |
| MHB-10M-2 |
0.07 |
133 |
24.0 |
20,000 |
35 |
8 |
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| MHB-20M-2 |
0.14 |
217 |
26.0 |
20,000 |
50 |
12 |
see data sheet |
| MHB-50M-2 |
0.35 |
253 |
24.0 |
15,000 |
90 |
23 |
see data sheet |
| MHB-140M-2 |
1.00 |
253 |
24.0 |
12,000 |
300 |
75 |
|
| MHB-250M-2 |
1.75 |
270 |
25.9 |
10,000 |
450 |
110 |
see data sheet |
| MHB-450M-2 |
3.20 |
442 |
22.1 |
8,000 |
670 |
160 |
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| MHB-750M-2 |
5.00 |
383 |
23.0 |
7,000 |
1,000 |
200 |
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| MHB-1750M-2 |
***13.00 |
600 |
31.2 |
6,000 |
1,200 |
350 |
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| *90 bolt and non-standard coil voltages are available. 12 VDC coils are available on HB-3M-2 through HB-450M-2 models. |
| **Kinetic power ratings are maximum values based on limiting coil and/or bearing temperature to approximately 100° C, and should not be exceeded. actual values in service may vary ±50% depending on mounting, ventilation, ambient temperature, ect. |
| ***13 N·m is attainable @ approx. 600 mA. This value may decrease to 12.36 N·m if the brake is powered by any power supply or controller limited to 500 mA. |
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| Applications |
| Magtrol's innovative approach to providing
the best possible tension control systems available has led
to the development of the Matched Torque Hysteresis Brake.
This unique ability to provide matched performance characteristics
from any number of brakes of like design and rating makes
it possible to control a matched group of brakes from a single
sensor or in open loop. This assures that the same level of
current to each matched brake will result in virtually the
same torque from each matched brake. |
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Magtrol
Matched Hysteresis Brake used in a multiple payoff system
where one sensor controls tension in the system. Due to
specially calibrated matched brakes, it is possible to
hold each payoff tension within ±1% at matched point
value. |
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Large
Bore Hysteresis Brakes installed in a fiber optic stranding
machine to control the tension of the wrapping material. |
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