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| Keywords: RabinowJacob 038.jpg The electromagnet for energizing the magnetic fluid which normally fills the clutch casing utilizes the coil windings in the center of the clutch By varying the strength of the magnetic field which in turn controls the degree of locking between the driving plates and the driven plate any value of torque up to locking can be obtained When completely disengaged the driving shaft to the right turns freely as do the two plates attached to it As electric power is applied the bond between the two driving plates and the center driven plate begins to develop and the entire assembly begins to turn Jacob Rabinow invented the Magnetic Particle Clutch in 1947 during his work on ordnance at the National Bureau of Standards The particle clutch used a mixture of light lubricating oil and powdered carbonyl iron inside a chamber connecting two free spinning plates When an electromagnet attached to the chamber was energized the iron particles would magnetize and attract each other producing an almost solid mass which locked the plates together Controlling the magnetic flux would control the amount of torque between the plates Because Rabinow invented the Magnetic Particle Clutch as part of his work at the National Bureau of Standards the United States Government owned the U S patent However in partnership with his brother Joseph Rabinow did file for patents in 22 foreign countries Due of the simple design precise torque control smooth operation and long life the device found wide application It was used in Renault and Subaru automobiles in Europe and Japan in airplane controls and in the disc file of the IBM RAMAC computer Reference Inventing for Fun and Profit Jacob Rabinow San Francisco Press San Francisco CA 1990 pp 49-55 National Institute of Standards and Technology 2013-09-09 15 22 14 National Institute of Standards and Technology PD-USGov-NIST PD-USGov Magnetic_particle_clutches Cutaways | ||||
