Magnetic particle clutches and brakes are electro-magnetically actuated
and consist of input and output members with a cavity between them.
Within that cavity are very small, magnetized metal particles. The
ability to engage across a wide range of input power makes the magnetic
particle designs useful for tension control applications where a less
than fully locked up condition is an advantage. Frictional units can
suffer from a stick-slip behavior when low engagement force and low
speed are applied. In magnetic particle clutches and brakes, the
ability of the particles to slip against each other helps eliminate this
behavior, even down to single-digit RPMs.
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