transformers;  magnetic flux;  Excitation current

Since the output voltage of the resolver is independent of the speed and there are no brushes and slip rings, it is suitable for the excitation system of synchronous motors with thyristor speed regulation. Using the methods of circuit analysis and magnetic circuit analysis, the structural characteristics of the resolver are analyzed, and it is derived that when the angle between the stator core and the rotor core surface to the shaft core meets certain conditions, the magnetic resistance of the resolver can be guaranteed to remain unchanged when rotating. When the air gap ratio k=2, the three-phase voltage is symmetrical.