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MBI Fluid Power On small motors, the commutator is usually permanently integrated into the rotor, so replacing it usually requires replacing the rotor. Field magnets - The magnets create a magnetic field that passes through the armature. The field magnet is usually on the stator and the armature on the rotor, but in some types of motor these are reversed. In this mode of operation, the motor applies a steady torque to the load. They are more efficient than AC fans using shaded-pole motors, running much cooler than the AC equivalents. This cool operation leads to much-improved life of the fan's bearings. Armature circuit – A winding that carries the load, either stationary or rotating. A fractional-horsepower motor either has a rating below about 1 horsepower (0.746 kW), or is manufactured with a standard-frame size smaller than a standard 1 HP motor. By the operations of the stator and the rotor, AC motors produce magnetic flux and induced current inside the motor and gain rota