POWER FLOW ANALYSIS AND APPLICATION SIMULATION OF ELECTROMAGNETIC CONTINUOUSLY VARIABLE TRANSMISSION

With the structure of two air gaps and two rotors,the electromagnetic continuously variable transmission(EMCVT) is a novel power-split continuously variable transmission(CVT).There are two kinds of power flowing through the EMCVT,one is mechanical power and the other is electric power. In the mean time,there are three power ports in the EMCVT,one is the outer rotor named mechanical power port and the other two are the inner rotor and the stator named electric power ports.The mechanical power port is connected to the driving wheels through the fmal gear and the electric ports are connected to the batteries through the transducers.The two kinds of power are coupled on the outer rotor of the EMCVT.The EMCVT can be equipped on the conventional vehicle being regarded as the CVT and it also can be equipped on the hybrid electric vehicle(HEV) as the multi-energy sources assembly.The power flows of these two kinds of applications are analysed.The back electromotive force(EMF) equations are illatively studied and so the dynamic mathematic model is theorized.In order to certify the feasibility of the above theories,three simulations are carried out in allusion to the above two kinds of mentioned applications of the EMCVT and a five speed automatic transmission(AT) vehicle.The simulation results illustrate that the efficiency of the EMCVT vehicles is higher than that of the AT vehicle owed to the optimized operation area of the engine.Hence the fuel consumption of the EMCVT vehicles is knock-down.