| As one of the significant means of energy saving and emission reduction, hybrid electric vehicle has become a hot research topic. And the power transmission device is one of the key technologies. Thus, electromagnetic composite transmission system then arises at the historic moment. Because of the virtue of its high efficiency, high reliability, high power density advantage it reflects the great application potential and has caused the research upsurge in the field of hybrid vehicles. However, research on electromagnetic composite transmission system is also facing some challenges. Due to the defects of difficulty to control and serious fever, related research mainly stayed in the exploration stage of the test bench, which seriously constrains the application of electromagnetic composite transmission system. Therefore, the research on the application of electromagnetic composite transmission system is the key to promote its further development. In the perspective of application, this paper focuses on hybrid vehicle operation demand and studies on the output characteristics related to the electromagnetic composite transmission system. Based on the analysis method of common permanent magnet synchronous motor, considering the special structure and working principle of the electromagnetic composite transmission system, the characteristics of the dynamic output and the thermal equilibrium of its power output are analyzed and its output capability is evaluated. Then, the improvement measures are put forward for the existing defects, and the basic strategy for achieving the accuracy of the defects is explored.The output state of the maximum operating point of the electromagnetic composite transmission system is solved by using the theoretical analysis and the basic electromagnetic parameters obtained by Maxwell simulation. Thus, the mechanical characteristic curve of the machine is acquired. By the curve analysis, it is proved that the electromagnetic hybrid transmission system can not be restricted to the adjustment of the design parameters of the body to broaden the operation area of the constant power. And through case analysis, we prove that it can realize larger continuous speed ratio range and provide the large output torque.Through the solution of the loss of each component of the electromagnetic composite transmission system, the efficiency of each working point is obtained and the efficiency Map chart is drawn. From the Map diagram analysis, the electromagnetic composite transmission system has good efficiency characteristics. Not only the maximum efficiency is large, but also the range of high efficiency is wide. And the results are in high agreement with the experimental results. In addition, the electromagnetic composite transmission system has high power density. Also based on the solution of loss, the simulation model of transient temperature field is established by Workbench. The simulation results show that, the stator and the outer rotor temperature can be controlled in the normal range, while the inner rotor temperature rise can not be effectively controlled due to restrictions on the structure and cooling condition.Based on the structure of electromagnetic composite transmission system, the new transmission scheme is explored. The scheme can not only effectively avoid the high temperature rise of the rotor in the electromagnetic composite transmission system, and can increase the overall transmission efficiency. The simulation results show that the scheme is feasible. At the same time, combining the special transmission principle of electromagnetic compound transmission system, the control strategy of the inner motor speed loop control and the outer motor torque loop control are proposed and the torque control is realized. |
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