2015 Designer's Notebook - 140
Sofstep® Selection
To properly size a magnetic particle
brake, clutch or clutch/brake, two factors
must be considered:
1. Torque
2. Watts
1. Torque
Use the torque equation to determine
your required torque in pound-inches.
2. Slip Watts
When a brake is providing resistance to a
rotating shaft, or when a clutch is
slipping, mechanical energy is being
converted to thermal energy. The rate
that energy is being converted is
expressed in terms of slip watts and is
a function of torque and slip speed.
Magnetic Particle Clutches & Brakes
For continuous slip applications, such as
tensioning, use the appropriate selection
example to determine your slip speed.
Once slip speed is determined, use the
quick selection chart to choose a unit
that will be thermally sufficient.
In cycling applications, heat is being
generated intermittently. However,
the brake or clutch acts as a "heat
reservoir" that continuously dissipates
the heat to the environment. Therefore,
use the cycling example to determine
average slip watts. Then, use the
performance chart to select a unit that
will produce the required torque and
dissipate the average slip wattage.
In cycling applications, peak watts may
be high enough to cause temperatures
to temporarily exceed recommended
operating temperatures. For unusual
environmental conditions or applications,
call your MAGPOWR sales engineer.
Tension
Unwind Tension Control
Information Required:
Full roll diameter = 10 inches
Tension* = 2 lb
Velocity = 200 fpm
How to size:
Torque (lb-in) =
Tension (lb) x Full Roll Diameter (in)
2
2
x
10
=
= 10 lb-in
2
12 x Velocity (fpm)
Slip RPM =
π x Full Roll Diameter (in)
= 12 x 200 = 76 RPM
π x 10
Slip Watts = .0118 x Torque (lb-in) x RPM
= .0118 x 10 x 76
= 9 Watts
Roll
Select brake model PSB-15 from
quick selection chart below.
Torque
*Note: If tension is unknown see section on
calculating web tension.
Sofstep
Brake
Quick Selection Charts
(Continuous slip only)
First find slip rpm on vertical axis, then
locate torque on horizontal axis. Find
intersection of two lines. If below line
and in blue area, the brake is thermally
sufficient to handle the generated heat.
If it lands on the line or in the white
area, the a larger unit is required.
PSB-15
PSC-15
PSB-70
PSC-70
PSB-2
PSC-2
PSB-120
PSC-120
140 Magnetic Particle Clutches & Brakes
PSB-240
Table of Contents for the Digital Edition of 2015 Designer's Notebook
Table of Contents
2015 Designer's Notebook - Cover1
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2015 Designer's Notebook - Table of Contents
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2015 Designer's Notebook - Cover3
2015 Designer's Notebook - Cover4
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