A shunt dynamo (Fig. 86) is a machine which has only a portion of its total current passing through the field magnet coil. It is used in all cases where it is desirable to have a constant pressure voltage at all loads, as in the case of the ordinary parallel or multiple system used for lighting buildings. The shunt machine is used in large plants, where the diversity factor is so large that the varying demands of customers tend to average up and keep the load either constant or very nearly so.
Fig. 85. - Series-Wound Dynamo.
Fig. 86 - Shunt-Wound Dynamo.