Abstract: The multi-ring flywheel rotor can improve the stress level inside the composite material, which can also solve the problem that the radial strength of extension of the composite material is insufficient. The influence of the designation result from the interference and the number of rings is complicated, so it′s important to design it rationally. The multi-ring composite material flywheel rotor was analyzed in different interference conditions to obtain the effect that the interference has on the stress level inside it. From the results, it can be seen that the interference has distinct influence on the adjacent rings. However, it has less influence on the rings that isn′t adjacent to it. The more the rings are, the less the minimum interference needed to guarantee that the rings won′t separate. But, the stress between the hub and the composite material is raised obviously so that it may exceed the maximum compressive strength. Changing the interference that is adjacent to the position where the stress level isn′t satisfied is the most effective way to improve it.

Key words: multi-ring rotor, composite material, stress analysis, interference fits