Sumlating DC Motor in Multisim - https://www.precisionmicrodrives.com/application-notes/ab-025-using-spice-to-model-dc-motors
https://www.rs-online.com/designspark/different-types-of-motors-and-their-use	(Types of motors chart)
https://www.electrical4u.com/series-wound-dc-motor-or-dc-series-motor/    (descriptions of dc motors)