A Fully Superconducting Homopolar DC Machine

With the development of superconductors and carbon brush technique, the fully superconducting homopolar dc machine (FSHDM) is promising to realize. In this paper, the principle and performances of FSHDM are discussed, and a 35-kW FSHDM has been designed and analyzed. Through theoretical analysis and finite elements analysis, the FSHDM is found to be with competitive high power density when it is compared with the conventional homopolar dc machine.