Calculation of Stray Load Losses in D-C Machinery

The increased use of d-c machinery in controlled industrial drives and in automation has created renewed interest in the finer points of their design. The use of digital computers now makes it possible to include in the design calculations complicated stray load-loss equations without imposing on the valuable time of the designer. A review of information on stray load losses seems to be desirable at this time. This paper describes the state of the art as it is presented in published papers dealing with the theory of load losses. The losses are classified in the paper according to the location where they occur. The cause of the losses is described and then the calculation of losses is reviewed historically. Some of the results are reproduced and a bibliography is added. The bibliography does not claim completeness. It is believed that the most important papers published in the American, English, French, and German engineering literature, referring to stray load losses, are quoted. Papers that did not contain any new method, idea, approach, simplification, or test data and were repetitions of publications already among the references were omitted.