. The principles underlying radio communication . of aswitch and starting box/® The rheostat sliown in circuit witlithe motor field, MF, may be omitted. Its purpose is to give con-trol of the motor speed,^ if such control is desired, in order toget some definite frequency quite accurately in the a. c. the d. c. line, connection is made also to the generatorfield winding, the flow of current being controlled by anotherrheostat which determines the magnetization and, therefore,the generator voltage. Thus the generator frequency may begoverned by means of the motor field rheostat and
. The principles underlying radio communication . of aswitch and starting box/® The rheostat sliown in circuit witlithe motor field, MF, may be omitted. Its purpose is to give con-trol of the motor speed,^ if such control is desired, in order toget some definite frequency quite accurately in the a. c. the d. c. line, connection is made also to the generatorfield winding, the flow of current being controlled by anotherrheostat which determines the magnetization and, therefore,the generator voltage. Thus the generator frequency may begoverned by means of the motor field rheostat and the voltageby the generator field rheostat. Motor-Driven Inductor Alternators.—Thus far in this partof the chapter attention has been centered on revolving armaturegenerators. It is equally feasible to generate 500-cycle cur-rent by means of inductor alternators. Fig. IZi representsa motor-driven inductor alternator for conversion from directto alternating current at 500 cycles. The table following givesthe data as taken from the name Fig. 122.—Motor-generator set of Fig. 121 partly dismantled. 1. Motor brushes. 2. Motor field windings. 3. Motor field poles. 4. Motor field joke. 5. Terminals of motor field wind- ings. Described in Sec. 97. ^o How this is done is explained in Sec. 97. INDUCTOR ALTERNATORS. 199
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