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
A. A. M. Stols A. A. M. Stols A. A. M. Stols (usually called Alexander or Sander, 1900-1973) was a Dutch printer and publisher, known best for his limited bibliophile editions of Dutch poetry. Stols was born in Maastricht, 28 January 1900. He was a son of Ludovicus Hubertus Alexander Stols (1870-1942), printer and publisher, and Alida Alphonsine Fermin (1874-1960); his father was the co-founder and co-owner of the Maastricht publishing house Boosten & Stols, which was later run by Sander's two younger brothers. In 1928 he married Margaretha Wilhelmina Kroesen (1908-2002). They had three children. Stols finished the Hogere Burgerschool in 1917, and