The characteristics of electric motors involved in their application

Industrial power work in the electrical field consists primarily in applying electric motors to the driving of various kinds of machinery. The machines to be driven possess characteristics of different kinds and are run on duty cycles which are often peculiar to the classes of industry involved. Generally the characteristics of the machine to be driven are fixed and the class of motor suitable for this work must be selected with regarded to these features. Motors themselves are adapted to the work of driving machines largely through various forms of controllers. A study of the characteristics of various classes of electric motors in the light of their adaptability to the requirements of the work to be done and a review of certain limitations and mechanical considerations is the object of the paper.