Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...of one type, i.e., compound-wound, but this is subdivided into other types, such as differential compoundwound, cumulative compound-wound, and the like, that is, all lighting generators have a shunt and a series winding on their fields, but the relation of these windings to one another differs, depending upon the characteristics of the remainder of the system. Q. What is a differential compound-wound generator? A. One in which the series winding is reversed, i.e., wound in a direction opposite to that of the shunt winding so that its exciting effect on the field magnets opposes that of the shunt winding. The series winding is then termed a bucking coil because it bucks, or opposes, the exciting effect of the shunt winding on the field magnets as the speed increases. The series winding in this case is used simply for regulating the generator output. Q. What is a cumulative compound-wound generator? A. One in which the exciting effect of the series coil is added to that of the shunt coil, the series coil in this case having no connection with the regulation of the generator output. Q. As one of the chief requirements of an efficiently operating system is the control of the generator output under widely varying speeds, how is a generator of the cumulative compound-wound type employed on the automobile? A. The series winding is in practically an independent circuit in connection with the lamps of the car so that its exciting effect is not added to the field magnets except when the lights are switched on. This automatically increases the generator output in accordance with the number of lights turned on so that the lights have no effect on the battery charging rate, which remains the same whether the lights are on or off. An external regulator is employed to con...
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