Abstract
The conventional servo powertrain exhibits low energy efficiency under inconsistent working conditions, such as low speed with high torque or high speed with low torque. To handle this problem, this paper presents an in-depth study of a dual-motor planetary differential gear train with brakes (DMPTB) that can allocate the working requirements to two motors to meet higher energy efficiency. A comprehensive energy model of the DMPTB is developed, and the effect of losses on the output torque is considered to give more explicit torque-speed characteristics. To ensure both motors work in high energy efficiency domains, evaluation functions of the energy-saving control strategy and parameter optimization are proposed. The results of a stamping process demonstrate that the energy consumption and installed power of the DMPTB are reduced by about 8% and 27% compared to a dual-motor torque coupling gear train, respectively. Furthermore, by comparing the energy efficiency maps, the energy-saving principle of the DMPTB is revealed. It can be seen that the application of brakes is crucial for the energy-saving effect of the DMPTB.
Published Version
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