Читать книгу Handbook of Large Hydro Generators - Geoff Klempner - Страница 28

In hydro generators, the winding producing the magnetic field is made of a number of coils connected in a series circuit, energized with DC power typically supplied through the shaft from slip or collector rings on the shaft. In self‐excited generators, the shaft‐mounted exciter and rectifier (diodes/commutators) generate the required field current. The shaft mounted exciter is itself excited from a stationary winding. Alternately, static excitation eliminates the need for shaft driven exciters. This method is commonly applied to modern generators or as an upgrade for older machines where maintenance and performance are issues. Generators typically have field supplies of 125 or 250 V DC, and in some machines even higher depending on the design. A more elaborate discussion of rotor winding design and construction can be found in Chapter 2.