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Types of D.C. Generators

  • The power stations of modern design generate practically only three-phase alternating current. A large part of this power is used in the form of alternating current in industry, for lighting and domestic needs. When industrial needs make it necessary too or when it is of greater advantage to use direct current (for chemical and metallurgical plants, electric traction, etc.) it is generally obtained by converting A.C. to D.C. with the help of converters of ionic or machine types. In the latter case wide use is made of such installations as motor generator sets in which A.C. motor is coupled to a D.C. generator on a common shaft.
  • As primary sources of power, D.C. generators are mainly used in self-contained plants such as automobiles and air planes, for electric arc welding, train car lighting. ill sub- marines, etc.