The Dewalt 398076-00SV Armature and Bearing assembly is an essential internal component within power tools. The rotor has a rotating coil of wire, an armature, mounted upon a shaft supported by bearings. The motor's armature is passed from the stator, which generates a magnetic field when electrical current passes through it, and thus a magnetic field is a product of electrical current and the stator, hence both interact with each other. This torque produced by this interaction results in rotation of the armature. The armature can rotate smoothly and efficiently because of the way bearing frees the armature.
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