Wire Tension Application diagram


Ogura brake used to control tension on wire spools.

Products Used

Ogura magnetic particle brakes.

Size Used

OPB series, actual size will depend upon torque requirement.

Description of Operation

As the wire is pulled into the wire twister it goes through a load cell which measures the tension on the wire. The load cell (S1,2,3,4) feeds back the amount of tension on the wire into the controller which in turn feeds the voltage back to each of the brakes (POB1,2,3,4). Since voltage is proportional to torque in magnetic particle brakes this provides a relatively simple control to achieve accurate tension.

Reason for Selection of the Ogura Magnetic Particle Brakes

Because there is a wide range of tension required as a spool pays off, the magnetic particle brake is the ideal product for the application. Since the torque output of the magnetic particle brake relates directly to the voltage input this can be easily controlled by a combination of a load cells giving accurate wire tension and a controller providing variable voltage to the brakes . Since the output of the brake is geared into each of the wire spools it makes attachment and removal of either the brake or the spools very easy. Magnetic particle clutches and brakes are also totally sealed and sometimes this is a benefit in wire winding applications because there is an oil mist present which could adversely affect friction brakes.

Other Applications

Besides coil winding and unwinding, any type of light film tensioning is usually good for magnetic particle clutches and brakes. Other applications that require tension control are adhesive tape, as well as video and audio tape applications.