The electromagnetic powder brakes and clutches of our ELEFLEX product line have been in production for more than 20 years now and are among our most reliable products. Together with our extensive know-how, the great wealth of experience we have gleaned from thousands of application scenarios in a wide range of industry sectors, our constant endeavours to find absolute top-quality materials as well as the numerous studies we have conducted have put us in a position to upgrade our merchandise on a continual basis. The result is that we recently added another innovative component to our ELEFLEX brakes and clutches that guarantees you extremely low residual torque.
The principal advantages at a glance:
- A high degree of precision for regulating torque
- Small dimensions
- No hazardous substances
- Reduced residual torque
ELEFLEX magnetic powder brakes and magnetic powder clutches are therefore suitable not only for use in the printing industry – in particular for machines used in flexographic printing and gravure printing – but also in gastronomic applications, where high standards for hygiene and dust emissions need to be met. Furthermore, thanks to their very low residual torque they are predestined to be employed in the food-packing industry – in laminating and plastic film machines as well as in all applications where low web tension is required.
Our worldwide distribution network guarantees you customer service that is highly specialised, providing you with competent technical support in response to your call within just a few hours.
The electromagnetic power brake comprises three main components: a coil, a stator and a rotor. When electricity is supplied to the brake, the magnetic field inside the coil begins to fluctuate depending on the ratio of the current intensity. In the end, these magnetic field fluctuations affect the viscosity of the magnetic powder between the rotor and the stator. When electrical power is applied to the coil, the powder particles line up along the lines of force of the magnetic field binding the rotor and stator together. This produces friction, and braking ensues. However, when the current is disconnected, centrifugal force presses the powder against the stator. This subsequently releases the rotor, which can then turn freely once more.
The powder particles line up along the magnetic lines of force. This binds the rotor and stator together.
Once the magnetic field is gone, centrifugal force presses the particles back towards the stator.
Our assortment of powder brakes ranges from the tiny B.20, which produces 2 Nm of torque, all the way up to the B.5000 with its 500 Nm of torque. In addition, all brakes can be equipped with heat dissipation devices such as cooling rings or fans to extend their service life. In order to maintain a constant power supply, the torque of our electromagnetic brakes can fluctuate by 5 per cent. Moreover, torque is independent of the rotor speed, the recommended operating range of which lies between 40 and 2,000 rpm. For the new generation of our brakes, we have developed a special design that reduces the residual magnetism of the iron brake ring as well as the mechanical friction by lowering residual torque to less than 1 per cent of the rated torque.
Our technical department is ever at your beck and call to discuss solutions for all your special areas of application and to work alongside you to make them a reality. It is our objective to meet our customers’ needs to the full extent possible. This is why we have already designed specific solutions for several of our customers. To name but a few examples:
- Brakes and clutches that work reliably even at very low speeds (40 rpm) or at higher speeds (2,000 rpm)
- Brakes with high-capacity fans
- Special brakes and clutches for applications requiring vertical mounting
|Residual torque Nm||0,04||0,3||0,04||0,06||0,2||0,4||0,5||0,5||3||6|
B brakes C clutch
These models are primarily used in the textile industry and for manufacturing metal wire. They permit low web tension and enable precision control of the tension applied. Our technical department is at your service and will be happy to provide you with tailor-made solutions to meet your specific needs. This includes equipping brakes with heaters or fans. We will gladly develop special mini brakes and clutches for you as well.
The FP.25 control board is an analogue current regulator that keeps the current supply to the electromagnetic powder brake or clutch at the level required. It is possible to use a closed current loop to ensure that torque – independent of fluctuations in the supply current or the ambient temperatures of the brake/clutch – remains stable. It is even possible to use a dancer roll system. To simplify installation, the FP.25 control board is equipped with a 10-pole connecting plug with a threaded clutch.
|Power supply FP.25/1||24 Vac/dc + 10%|
|Power supply FP.25/2||110/220 Vac - 50/60 Hz|
|Input||0-10 Vdc / 0-10 Vdc|
|Outout||0-2 Acc modulata PWM / modulate PWM|
|Absorbed power||30 W max|
|Current limiter||TR1 da -50% a +50% / TR1 from -50% to +50%|
|Polarization||TR2 da 0% a 100% / TR2 from 0% to 100%|
|Operative temperature||0 - 50° C|
The microprocessor-controlled digital regulator from Taurus can be programmed using the three keys located on the front of the board. It can be run using a closed loop and a tension regulator (e.g. T-one, MW90 or SPS) to ensure stable web tension. When using an open loop (with Sonar, a potentiometer or other analogue 0-10 VDC input signal), Taurus is able to guarantee braking/clutch torque stability independent of the brake’s condition (wear / temperature). The device can supply negative output current to prevent any residual magnetism and is therefore suitable for unlimited use in applications where low torque is required. Both the open (Taurus) as well as boxed (Taurus BX) versions are small enough to be mounted on DIN-compliant guides. The long, narrow shape of the Taurus, with the user interface located on the short side, was especially designed to take up a minimal amount of space when mounted to a panel.