Not all power applied to an electric motor is converted to work. Principal sources of energy waste include winding loss (I2R), windage, friction, stray load loss and loss in stator, rotor and armature cores. Studies have shown that depending on load, core loss is the first or second leading cause of energy waste in rewound motors, and can account for 25% or more of motor inefficiency.
What is Core Loss?
“Core Loss is a Waster of Energy and Destroyer of Motors”
A significant percentage of motors have core loss exceeding statistical acceptability. Moreover, government efficiency mandates make detecting sources of energy loss increasingly important.
The critical importance of core testing has been acknowledged by preeminent technical authorities, such as the Engineering Committee of the Electrical Apparatus Service Association (EASA). EASA’s Guidelines for Maintaining Motor Efficiency During Rebuilding require motor repairers to “Conduct a stator core test before and after stripping