Examples are given for the possible uses and characteristics of direct drives. It is evident that the technical and economic characteristics of direct drives and their suitability to solve particular problems cannot be properly assessed except within the context of a motive power system or plant. Various machine designs are compared and specific data are presented especially for slow-speed high-momentum drives. Here, too, it is apparent that because of the multitude of different specific characteristics of such machine designs, there is no universal drive, but that the selection must be made in accordance with the particular requirements of the user.
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