A design method of flywheel rotor consisting of composite rim and metal hub is given considering connection between rotor and driving machine. The influence of the factors such as the material

configuration

connection and facture technics of rotor on the energy density is analyzed. In the result

the ratio of inner radius to outer radius of rim is a key factor for energy density

which is determined by rim material. Optimizing hub can also further improve the energy density. Due to the theory value of composite and the mechanic constant of glue is not exact

it has been revised via the experiment for improving the veracity of emulational results. A composite flywheel rotor is produced

moreover

the rotate stress testing is carried on the speed of 20 000 r/min. The results of emulation are consistent with test

it is proved to be right of the design method on the paper.