eddyclutchFeatures & Benefits of Eddy Current Clutches

  • Accurate tension in ounces or grams
  • Large bores and narrow widths
  • No electricity, no slip rings
  • No break-away torque
  • No wearing parts


slitterHow Eddy Current Clutches Work

Eddy Current clutches give torque as a function of RPM. The faster you turn the rotor, the more torque. This means by increasing or decreasing the RPM, you can get infinite torque adjustment. Typically, we rate the clutch with a gain factor (k), which is gram millimeters/rpm or Newton meters/rpm and we design the clutch to have an operating “slip rpm” between 1 and 300 rpm.

Time Proven Designs

At Magnetic Technologies Ltd. we have been building custom eddy current clutches since 1984. We are constantly fine tuning and improving our designs. Today, we have hundreds of custom designed units in use. We have eddy current clutches running on every continent. Because of our maintenance and retro-fit programs, we have a chance to see how our clutches perform over time. Most are still in use even after 15+ years of continual service!

Pricing & Delivery:

We build all our eddy current clutches to order. Some of the most popular sizes include:

(1) 76mm OD; 16 to 50mm wide; 25 to 45mm ID
Typical torque gain factor 17 to 100 Gmm/Rpm

(2) 152mm OD; 45 to 300mm wide; 50 to 90mm ID
Typical torque gain factor 0.020 to 0.142 Nm/Rpm

Typical Applications: 

Generally, eddy current clutches are used for take-up applications on slitting and rewinding machinery. Eddy Current Clutches give very accurate tension control.