Search results with tag "Field current"
III. Synchronous Motors - University of Technology, Iraq
www.uotechnology.edu.iqSuppose the synchronous motor is initially overexcited (in other words, excited with a large field current) and is operating at point , as shown in Figure . 1 . The 3 corresponding armature current . I. is the in-phase component of armature current). 1. is leading . V, and hence the input power factor is leading. Reduction of field current ...
EE 340 Spring 2011 - UNLV
www.egr.unlv.eduThe rotor of a synchronous machine is a large electromagnet. The magnetic poles can be either salient (sticking out of rotor surface) or non- ... • It is possible to adjust the field current on the main machine by controlling the small DC field current …
EE320 Homework # 9 Synchronous Machines
www.usna.eduThe machine op erates at a pow angle of 31.48 with a field current of 100A. The line-to-neutral terminal voltage is 2400Vrms. a. Find the speed of the prime mover in rad/sec b. Determine the excitation voltage c. Find the line current d. Find the power consumed by the load and its power factor e. Find the developed torque...
Synchronous Machines - Virginia Tech
www.courses.ece.vt.educurve (OCC) and the short-circuit current curve (SCC) for a typical machine. The voltage curve slope begins to decrease as the field current increases due to saturation of the iron in the machine. Figure 12: Open-circuit and short-circuit characteristics of a synchronous machine at rated speed. The impedance is Z = R jX s 1