Circle diagram constant air-gap induction motor images shown here, where, The circle diagram is drawn using the data obtained from no load and either short circuit or, in case of machines, blocked rotor tests by fitting a half-circle in points O and A. Beyond the error inherent in the constant air-gap assumption, the circle diagram introduces errors due to rotor reactance and rotor resistance variations caused by magnetic saturation and rotor frequency over the range from no-load to operating speed. Steinmetz equivalent circuit Circle diagram First conceived by A. Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the
Young woman with a letter and a messenger in an interior inches. A picture of similar dimensions was sold at the Leers sale (201), but this may be the picture formerly in the Hope collection in London (195). Sales: Afterwards in the Van der Hoop collection, No. 50 in the 1876 catalogue. Now in the Rijksmuseum at Amsterdam, Van der Hoop bequest ; No. 1249 in the 1905 catalogue (formerly No. 682)." Young woman with a letter and a messenger in an interior Young woman with a letter and a messenger in an interior (1670) is an oil on canvas painting by the Dutch painter Pieter de Hooch, it is an