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 illustrated a number of his books. In 1951 Stols left for Latin America, where until 1962 he worked for UNESCO in Ecuador, Guatemala, and Mexico. After a brief stay in the Netherlands he returned to Mexico in 1963 where until his retirement in 1965 as a cultural and journalistic advisor. He then moved to Tarragona, Spain, where he died in 1973. 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