Alexander Heyland

Alexander Heinrich Heyland (born July 3, 1869 in Iserlohn, March 14, 1943 in Brussels) was a German electrical engineer who invented the pie chart of the asynchronous machine. Pie chart of an asynchronous machine. Alexander Heyland's father Ferdinand Heyland ( 1881) came from Gütersloh and was the royal district judge and later notary. His mother was born Marie Heyland Booze. His sister Helene (1871-1916) married the Prussian general and later minister Hermann von Budde. From 1890 to 1894 Heyland studied at the Hanover Technical University (with Wilhelm Friedrich Kohlrausch?). In 1894 he gave the pie chart of the asynchronous machine, which is still known today as the “Heyland Circle” and was later expanded by Johann Ossanna. Alexander Heyland later worked at Elektrizitäts-AG, formerly W. Lahmeyer & Co. in Frankfurt am Main and at Ganz & Co. in Budapest, until he became Erasmus Kittler's assistant at the Darmstadt University of Technology in 1896. In 1897 Heyland was a consulting engineer at Lahmeyer and developed the Heyland single-phase motor. From 1898 he worked at the Electricité et Hydraulique Cie. in Charleroi (Belgium) and Jeumont (France), where Heyland started producing AC and three-phase motors.