Motion Control and Performance Evaluation of a Magnetic-Geared Dual-Rotor Motor in Hybrid Powertrain

The magnetic-geared dual-rotor motor (MGDRM) has been proposed as a power split device for several years, but there is not an evaluation work for an MGDRM in a real hybrid powertrain so far. As a pilot demo, an MGDRM-based hybrid powertrain with a real engine is built and tested in a real hybrid test bench. The closed-loop speed control is developed for the MGDRM, with which two pragmatic functions of the hybrid powertrain are realized by the MGDRM. First, the engine can be started by the MGDRM outer rotor no matter whether the vehicle is parked or traveling. Second, the torque coordination function of the MGDRM can help the engine to stabilize at a fixed work situation. This feature is the basement to adjust the operation and efficiency of engine. The power conversion efficiency map of the MGDRM is tested, based on which the performance of the power split in different operating situations can be evaluated.