Variable Speed Drives Employing Eddy Current Couplings for Component Testing

This paper will discuss the increasing need, development and finally the production units for precisely controlled variable speed drives. After outlining the basic needs for such equipment, two basic types of units and three specific needs, will be discussed in detail. The basic units that will be described are liquid cooled, constant torque, and air cooled, variable torque eddy current drive units. In the paper will be found a detailed discussion of the physical make up of each unit and the method used for obtaining precision control in any speed range.