Magnetic Powder brake and Magnetic-powder-clutch

FEATURES – Magnetic powder brake, Magnetic powder clutch

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.

  • 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.


B.20 B.53 B.55 B.121
Max. torque Nm 2 5 5 12 35 65 120 170 250 500
Residual torque Nm 0,04 0,3 0,04 0,06 0,2 0,4 0,5 0,5 3 6
Current consumption A 1 1 1 1 1 1 1 1 1 1
resistance ohms 24 24 24 24 24 24 24 24 24 24

B brakes C coupling


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

More products from IBD Wickeltechnik

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Current regulator


LEO is a microprocessor controlled digital current regulator that can be programmed by using the three buttons on the front of the board. It can be used with the closed loop regulation and a tension controller (such as T-one, MW90 or PLC) which guarantees web tension stability. When using an open loop (with sonar, potentiometer or any other 0-10 VDC analogical input) LEO guarantees brake/clutch torque stability irrespective of variations in the condition of the brake (wear/temperature). The device can supply a negative output current in order to cancel any residual magnetism and is suitable for use at low torque applications without limitations.

Power supply 24 Vac oder / or 24 Vdc ± 10%
Fuse 1,6 A / F
Input 0-10 Vdc (delta min. 2 Vdc)
Output 0-1,6 A PWM moduliert / modulation, fref. = 1,2 kHz
Absorbed power 35 W max
Operative temperature 0-50° C

Price Inquiry

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Technical data of all models as PDF download.

B.121 B.351 B.651 B.1201 B.1701 B.2500 B.5000 Mini models

Any questions about our brakes?

Talk to us about solutions Tel.: +49 5734 9602 – 0