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  • Magnetic fluids tackle tough sealing jobs
    . An important ferrofluidsealing application is on vacuum-rotary feedthroughs. The main components are a magnetic circuit comprised of highpowered permanent magnets, pole pieces, ferrofluid, and a magnetically permeable shaft and precision bearings. Annular channels in the pole pieces permit water
  • Sensor Sense: Inductive sensors and resistance welding
    triggering. Air-core coils wound on plastic spools reduce the coil's sensitivity to external magnetic fields. Low-permeability cores also reduce interference from outside magnetic forces while helping concentrate and direct the coil's own magnetic field. An internal time-delay circuit between
  • The Switch to Switched Reluctance
    with a stepper motor. An SR-motor rotor consists of laminated-steel protuberances. It carries no windings, magnets, or other features. The protuberances are strongly magnetically permeable. Areas surrounding them are weakly permeable by virtue of slots cut into them. SR-torque production resembles

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