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MR-brakes are electronically controllable brakes.  They can apply variable resistance forces.  MR-brakes use magnetorheological (MR) fluid, which changes its viscosity with magnetic flux.  In its natural state, MR-fluid resembles motor oil and is slippery.  When the fluid is exposed to magnetic field, its viscosity changes resulting in a sticky peanut butter consistency.  When the magnetic field is remove, the fluid goes back to its natural slippery state.

MR-Brake

 

We developed various MR-brakes with high force/torque output.  Our research work led to two U.S. Patents.  Please click the links on the left to explore some of our research.