A Study of the Heating of Railway Motors

A. H. Armstrong
1902 Transactions of the American Institute of Electrical Engineers  
The electric traction problem presents many new features for investigation which are not met with in steam railroading, and upon which little accurate data has been published. This is. especially true of that class of service calling for maximum speeds greater than 35 or 40 m.p.h., where stops are infrequent and cars are run singly or in trains of two cars or more. It is the purpose of this paper to enter into a discussion of some of the variables met with and their influence upon the motive
more » ... upon the motive power and station output for the higher as well as the lower speed schedules. The electrical engineer has to take care of two factors with which the steam engineer is unacquainted, keeping the temperature of the motive power within reasonable limits, and also the operation of single cars at maximum speeds of 60 to 70 m.p.h. That wind friction is a considerable factor with trains operating at high speeds has been abundantly proved by many tests, but these tests are worthless when used to determine the power required to propel a single car at the same hiigh speeds. As the electric motor has invaded the high-speed interurban field and has done so successfully because of the frequency of service furnished withi single-car trains, it becomes pertinent to inquire into the size of the motive power necessarv co prevent overheating and also the amount of power needed with the laigh speed schedules and frequent stops made. Regarding the tractive effort required to propel trains of one or two cars at speeds of 60 m.p.h. or more, there is almost a complete lack of experimental data. Formul_ based upon tests of steam trains made up of a number of lheavy coaches 809
doi:10.1109/t-aiee.1902.4764022 fatcat:opwshv3cz5ff5jarn26gcb46zu