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Some applications require very tight precision between all components. In these applications even a degree of movement between the input and the output when a clutch is engaged can be a problem. This is true in many robotic applications. Sometimes the design engineers will order clutches with zero backlash but then key them to the [...]

It is very rare that a coil would just stop working in an electromagnetic clutch. Typically, if a coil fails it is usually due to heat which has caused the insulation of the coil wire to break down. The heat can be caused by high ambient temperature, high cycle rates, slipping or applying too high [...]