When loads stray: Evaluation of Different Measurement Methods to Determine Stray Load Losses in Induction Machines

The efficiency data provided by manufacturers are measured or calculated according to different national and international standards. These standards use different means to incorporate the stray load losses; thus the efficiency values obtained from different testing standards can differ by several percent. This leads to problems in competition and to a potentially confusing situation for the manufacturers and customers. This paper evaluates different measurement methods to determine stray load losses in induction machines.