Merobel
Electromagnetic Powder (EMP) Brakes
Merobel’s most popular range: through-bore EMP brakes that keep a steady tension on unwinding wire, cable, paper, film and foil – and simulate variable torque on test rigs. Choose from 10 sizes and up to five cooling versions.
- 2 – 1,000 Nmrated torque
- 10sizes
- up to 10 kWheat dissipation
- 5cooling versions
The range
The EMP Brake Range
Sizes and Rated Power
Rated power in watts for each cooling version. FAT standard, FRAT with cooling fins, FVAT with fan, FRAT+VR fins and fan, FRATO water cooled (120 l/h).
| Size | Torque | FAT | FRAT | FVAT | FRAT+VR | FRATO |
|---|---|---|---|---|---|---|
| 20 | 2 Nm | 40 | 60 | |||
| 50 | 5 Nm | 70 | 100 | |||
| 120 | 12 Nm | 75 | 150 | 650 | ||
| 350 | 35 Nm | 100 | 210 | 500 | 1,400 | |
| 650 | 65 Nm | 150 | 350 | 700 | 1,800 | 2,000 |
| 1200 | 120 Nm | 300 | 550 | 1,400 | 2,000 | |
| 2002 | 200 Nm | 400 | 700 | 1,800 | 2,000 | 2,500 |
| 3500 | 350 Nm | 470 | 950 | 3,300 | ||
| 5001 | 500 Nm | 1,000 | 1,800 | 4,500 | 4,500 | |
| 10001 | 1,000 Nm | 1,700 | 3,000 | 7,000 | 5,000 |
Remnant-rotor (RR) versions are available for some sizes. Fans run on 24 V DC or 220 V AC depending on size; 110 V AC US versions exist.
How it works
How It Works
Torque from Magnetic Powder
Between the rotor and the housing is a gap filled with fine magnetic powder. When current flows in the coil, the powder lines up along the magnetic field and binds the two together; the more current, the more torque. With no current the powder is loose and only a small residual torque remains.
Torque depends on current, not speed, so it can be set precisely and held while the unit slips continuously – which is what keeps tension steady as a roll changes size.
Why Merobel EMP brakes
Made for Tension
Through Bore
Easy to fit on converting, printing, wire and packaging machines.
Match the Heat
Pick natural, finned, fan or water cooling to suit the slip power.
Precise
Torque proportional to current, stable at any speed.
Test Rigs
A cost-effective way to apply variable torque to engines and gearboxes.
How to choose
How to Size One
Torque
Rated torque must exceed the highest torque the job needs – allow for any gear or belt ratio.
Heat
Slip torque × slip speed is heat. It must stay under the rated power of the version you choose.
Residual Torque
Must be lower than the smallest torque the job needs.
Speed
Keep within the size’s minimum and maximum speed.
Literature & related
More Information
- EMP brakes catalogue
Through-bore brakes, sizes 20 to 10001 · PDF, 2.1 MB
Not Sure Which One You Need?
Tell us about the job – the machine, the conditions and what it has to do – and we’ll help you choose the right Merobel product.