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Burnishing is the wearing or mating of opposing surfaces. When the armature and rotor faces are produced, the faces are machined as flat as possible. (Some manufacturers also lightly grind the faces to get them smoother.) But even with that the machining process leaves peaks and valleys on the surface of the steel. When a [...]

There are actually two engagement times to consider in an electromagnetic clutch. The first one is the time it takes for a coil to develop a magnetic field, strong enough to pull in an armature. Within this, there are two factors to consider. The first one is the amount of ampere turns in a coil, [...]