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Automobile ignition, starting, and lighting; a comprehensive analysis of the complete electrical equipment of the modern automobile, including many ... all the important starting-lighting systems - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...being indicated at different points on the diagram. High-tension wires from distributors to spark plugs are carried in tubes supported on the cylinder blocks. BOSCH-RUSHMORE SYSTEM Twelve-Volt; Two-Unit; Single-Wire Generator. The bipolar shunt-wound type of generator i? made in two sizes, one for driving from pump shaft, and the other for silent-chain or belt drive. Regulation. Ballast Coil Employed. The regulation is the inherent type, using a bucking-coil winding in conjunction with a so-called "ballast coil" which automatically cuts the bucking coil in or out of the circuit, according to the resistance of the ballast coil. Mention has been made in Elementary Electrical Principles. Part I, that the resistance of certain metals increases greatly with an increase in their temperature. This is particularly the case with iron, and advantage has been taken of this fact in the Bosch-Rushmore generator. The ballast coil consists of a few turns of fine iron wire on a fluted porcelain rod. The bucking coil, which is simply a reversed field winding, has a polarity opposite to that of the winding employed to excite the field magnets. Consequently, when a current passes through it, the effect is to oppose the excitation of the field magnets. The bucking coil is connected as a shunt across the iron ballast coil, Fig. 148. The resistance of the bucking coil is considerably greater than that of the ballast coil when the iron wire is cold or only warm, so that at low engine speeds practically all the current generated passes through the shunt winding of the dynamo. However, the resistance of the wire increases at a constant rate with the current up to 10 amperes, after which it increases very suddenly owing to the heating effect of the...
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