Circle diagram Circle diagram First conceived by A. Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the graphical representation of the performance of the electrical machine drawn in terms of the locus of the machine's input voltage and current. The circle diagram can be drawn for alternators, synchronous motors, transformers, induction motors. The Heyland diagram is an approximate representation of circle diagram applied to induction motors, which assumes that stator input voltage, rotor resistance and rotor reactance are constant and stator resistance and core loss are zero. Another common circle diagram form is as described in the two
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