Dynamo, elementary

Figure 2-69 is a schematic of perhaps the simplest rotating machine, the elementary dynamo. The elementary dynamo consists of a rectangular-shaped coil, which is free to rotate about an axis. In a practical device, the coil is physically attached to a shaft... 

Note that the direction of the applied torque will dictate the direction of the induced current in the elementary dynamo. 

If the rotor of the elementary dynamo is turned in a uniform magnetic field, an AC emf and current are produced. If the speed of rotation is constant, the emf and current are sinusoidal as shown in Figure 2-69. 

If the slip rings of the elementary dynamo are replaced by a split-ring commutator, then a DC emf and current will be generated as shown in Figure 2-71. If the single... 

---