SYNCHRONOUS RECTIFIER

253

By using two commutators in series, as shown in Fig. Ill, the
two phases can be retained continuously in circuit while using

FIG. 113.—Voltage waves of water-phase ring-connected rectifier.

only two coils—but two commutators are required. The voltage
waves then are shown in Fig. 114.

FIG. 114.—Voltage waves of quarter-phase rectifier with two commutators.

A star-connected six-phase rectifier is shown in Fig. 115, with.
the voltage waves in Fig. 117. The unused part of wave e\ is

FIG. 115.—Six-phase star-
connected rectifier.

FIG. 116.—Six-phase ring-
connected rectifier.

shown shaded. A six-phase ring-connected rectifier in Fig.
116, with the voltage waves in Fig. 118.