Study on the magnetic-temperature characteristics of the induction asynchronous mechanical-electric-hydraulic power coupler

The promotion and application of new energy vehicles have become an important trend. However, traditional electric vehicles face challenges such as a single energy structure and high costs. Hydraulic power, on the other hand, features high power density, efficient regenerative braking, and reliable operation. To address issues with conventional multi-source power coupling devices, which are typically bulky, loosely structured, and exhibit low energy conversion efficiency, an Induction Asynchronous Mechanical-Electric-Hydraulic Power Coupler (IA-MEHPC) has been proposed. This coupler boasts a compact structure and facilitates the mutual conversion of mechanical energy, electrical energy, and hydraulic energy. The study explored the structural design and analysis methods for the electrodynamic and hydraulic power aspects of the IA-MEHPC. It analyzed the impact of the hydraulic power structure on magnetic field distribution. It also discussed the effects of temperature rise on the IA-MEHPC. Specifically, the study examined how temperature affects the inductance of the motor stator windings. Compared to existing research, this study is the first to thoroughly explore the impact of temperature on the system, particularly its thermal magnetic characteristics. The findings indicate that the introduction of liquid can effectively lower the motor’s temperature, ensuring stability and high efficiency under high load and high-speed working conditions. With increasing temperature, the average value of inductance shows a downward trend. In the Electro-Hydraulic Coupling Mode, the magnetic induction intensity of the motor increases by approximately 3% compared to the Pure Electric Motor Mode. This research provides crucial references for the structural design optimization and performance enhancement of the IA-MEHPC.