Abstract
The stray load losses of polyphase squirrel-cage induction motors have hitherto rarely been measured at rated voltage and full-load, owing to the great difficulties in achieving the required measuring accuracy; instead, mostly the reverse rotation test is used. This paper primarily deals with the question whether the reverse rotation test yields representative results. It is also examined to what extent it is possible to predetermine the stray losses by means of a series of new investigations on space harmonics of flux density and harmonics of rotor current. For this purpose the stray losses of a four-pole 11 kW polyphase induction machine with semi-closed and open stator slots as well as rotors with a varying number of unskewed and skewed slots are measured under no-load and full-load conditions and in the reverse rotation test and computed for machines with unskewed slots.
Published Version
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