Modeling and Inner–Outer Decoupling of Dual-Rotor Machines for Continuous Variable Transmission Systems

This paper develops a hybrid d-q model of a double salient dual-rotor machine (DSDR) based on the three-phase dynamic model for continuous variable transmission systems in the applications of hybrid electrical vehicles. The developed model considers the different operation characteristics of DSDRs and helps in understanding the interactions between the inner and outer machines. In this model, the inductances of the proposed DSDRs are all transformed into constants approximately and are independent of the inner and outer rotor speeds. Moreover, combining the traditions of d-q decoupling controllers with the innovations of dual-rotor machine couplings, an inner-outer decoupling control strategy with high performances is achieved. This inner-outer decoupling control strategy is capable of controlling the inner and outer machine quantities corresponding to the requirements of the engine and vehicle drivetrain. Finally, simulations and experiments are used to verify the effectiveness of the proposed modeling method and decoupling control algorithm.