Abstract
As a component of fuel cell vehicle, compact and high pressure ratio compressor has been developed. Development target of it is driven by an electric motor using normal bearings. The authors have developed a planetary gear system with gear ratio of 11.33 times. These features of planetary gear are 0.5 modules, special gear process, and duplicated directly gear and bearing by oil spray. And rotation speed of output shaft is very high, so bearing was made by special race and ceramic ball. The prototype has made and estimated. The pressure ratio of 3.4 has been achieved by impeller speed of 153,000rpm. Durability of the unit is continuing to be estimated and have confirmed to no trouble the early periods.
