ABSTRACT
Motor loss consists of copper loss, iron loss, stray loss, and mechanical loss. Copper loss is the Joule loss of copper winding of the stator coil. The iron loss consists of hysteresis and eddy current losses. If a time-varying magnetic field passing through a conductive material, then it sets up around itself an electric field that opposes the change in the magnetic field. The electric field induces a loop current in the ohmic conductor. The induced current, called eddy current, results in ohmic heating. But for motors and transformers, the eddy current implies a loss. To reduce the power loss, cores are constructed by stacking up thin steel sheets. The stray loss accounts for the losses of winding space harmonics and slot harmonics. The stray losses are due to the higher winding space harmonics and slot harmonics. Mechanical loss includes friction and windage losses.
