Fuel cell hybrid drive train configurations and motor drive selection

The performance and fuel economy of a fuel cell powered vehicle are greatly improved by the use of a hybrid drive train. The hybridization allows taking full advantage of the fuel cell system efficiency characteristics. The fuel cell is thus operated at average power demand where it is the most efficient while the batteries supply the traction motors at low power demand and assist the fuel cell at high power demand. The authors propose to investigate the possible fuel cell hybrid drive trains and to compare them on the grounds of fuel economy and feasibility. Then, based on the conclusions of this first analysis, a discussion of the most suitable electric motors follows. This discussion considers the qualities of electric motors that fit both hybrid drive train and fuel cell traction requirements. The motor drive technologies considered include permanent magnet brushless DC, switched reluctance and induction motor drives.