Developments in electrical machine design

Saratoga Springs, N. Y., June 23, 1925 E. J. Burnham: I am very much interested in the new type of frequency changer sets, viz.: The Scherbius-controlled set briefly referred to in this paper. This type of set has proven very desirable as a connecting link between two different systems, particularly where the two systems operate at different frequencies. The Scherbius type of frequency changer has one great advantage over the ordinary type of frequency changer, in that the load may be controlled at the point of inter-connection. In other words, it is not necessary that governor settings of prime movers be changed to obtain control of power interchanged.