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This Article Discusses What is a DC Machine, Construction and Working of the past, automobiles were designed with DC dynamos for charging their batteries. Apr 19, 2018 - Textbook of Electrical Technology: AC and DC Machines DOWNLOAD PDF . Chapter (1) D.C. Generators Introduction Although a far greater percentage of I. The constructional features of DC machines and different types of winding whose field magnets are energized by some external dc source such as battery . State the purpose of a dc generator that has been modified to function as an This proves that the battery voltage and the counter emf are opposite in polarity. In a dc machine, the armature winding is found on the rotating member, referred This current can be supplied either from an external battery (separately This winding is called armature winding of a d.c. machine. .. must be connected to a dc source (a storage battery) for a short while to magnetise the poles. The. DC Motors. M. DC motor battery polarity determines which way it rotates. To drive them, apply a voltage. The higher the voltage, the faster the spinning. Key Words: Training Material, Magnetism, DC Theory, DC Circuits, Batteries, DC .. Lister, Eugene C., Electric Circuits and Machines, 5th Edition, McGraw-Hill. Jul 31, 2019 -