Gearless electric drives for transport and industrial applications

Examples are given for the possible uses and characteristics of direct driv es. It is evident that the technical and economic characteristics of direct drives and their suitability to solve particular problems cannot be proper ly assessed except within the context of a motive power system or plant. Va rious machine designs are compared and specific data are presented especial ly for slow-speed high-momentum drives. Htrs, too, it is apparent that beca use of the multitude of different specific characteristics of such machine designs, there is no universal drive, but that the selection must be made i n accordance with the particular requirements of the user.