Wind or Hydro Homo-Heteropolar Synchronous Generators: Equivalent Magnetic Circuit and FEM AnalysisSorin Ioan Deaconu, Marcel Topor, Lucian Nicolae Tutelea, Ilie Nucă and Marcel BurduniucMATEC Web Conf., 210 (2018) 02008DOI: https://doi.org/10.1051/matecconf/201821002008