NEW MERCURY-GAP RING-COLLECTOR SYSTEM FOR DOUBLE-ARMATURE GENERATORS

This paper presents a new system, the mercury-gap ring collector (MGRC ), for supplying current to the rotating armature of the double-armatu re generator (DAG). The MGRC can be considered as a valid alternative to conventional collector rings with solid brushes. It offers several advantages over sliding contacts with carbon brushes, especially when the machine has high rating currents and high rotating speed. The desi gn of a prototype is presented in this paper; the experimental tests a re reported and a comparison between the MGRC and a conventional carbo n brush collector is discussed.