2015 Designer's Notebook - 149

Perma-Tork® Typical Applications
1. As A Tensioner
By using one of the Perma-Tork
assemblies, you can accurately control
tension. The hysteresis unit is best suited
for tensioning on unwind stands and nip
rolls.

2. As A Torque Limiting Device
The power-free, maintenance-free, PermaTork design is particularly suitable for
protecting all drive train, winding or
unwinding components. It not only
provides overload and jam load protection,
but there are no complicated electrical
feedback systems or mechanical wearing
parts to break down or require
maintenance. The only wearing parts are
the bearings themselves, and nothing but
the highest quality ball bearings are used.

Material Handling
handling

Coil Winding

3. As A Magnetic Coupling

Hysteresis clutch
clutch can
can provide
provide overload
overload
Hysteresis
protection and soft start
protection and soft start.

Constant tension provided by
hysteresis or magnetic particle unit

Perma-Tork clutches guarantee a soft
transfer of power between prime mover
and load at start-up. In this application,
Perma-Tork behaves similar to a fluid
coupling, but locks in at zero slip once
torque is reached.

4. Testing

Stranding, Braiding, Bunching
Tension provided by hysteresis or magnetic particle unit

Permanent Magnet Clutches & Brakes

149

Permanent Magnet Clutches & Brakes

Perma-Tork hysteresis units provide a
constant slip torque unaffected by wear,
humidity or "stick-slip". This makes it an
ideal device for many testing applications.
The torque can be precisely adjusted
(even at low speeds). Torque will not
fluctuate over extremely long testing
periods.



Table of Contents for the Digital Edition of 2015 Designer's Notebook

Table of Contents
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2015 Designer's Notebook - Table of Contents
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