DC-DC变换器与磁通切换电机磁性元件功能集成化关键问题研究

Low power density, high cost are the primary barriers for the development and the popularization of electric vehicles. Increasing the power density and reducing the cost are keys to solving this issue. In this project, a wound-field flux switching drive system based on magnetic component sharing concept is proposed. The field winding excites the motor magnetic field while being used as the inductor of the DC-DC converter. It realizes the functional integration between the power converter and the electric machine. By sharing the magnetic component, it not only boosts the power density, but also reduces the costs. In this project, the drive system design theory will be extended regarding the functional integration between power converter and electric machine. The mathematical model and control method for the motor drive system considering the magnetic component functional integration will be investigated. The impact of converter capacitor on the motor operation range and the torque-speed curve will be revealed. The generation mechanism and the corresponding suppression method for the current ripple induced by the motor magnetic field variance will be investigated. The research work in this project is expected to breach the bottleneck for the performance-cost ratio in electric vehicle industry. The research results will have both important academic value and application potentials.

功率密度低、成本高是电动汽车发展和普及化的难题，提高功率密度并降低成本是解决该难题的关键。本项目提出了基于功能集成化磁性元件的电励磁磁通切换电机驱动系统。其中集成化磁性元件作为电机励磁元件建立电机磁场的同时，还作为DC-DC变换器的电感，实现功率变换器和电机在功能层次上的集成。通过磁性元件功能复用，减少系统中磁性元件的数量，从而提高系统的功率密度，并降低成本。本项目将研究功率变换器与电机功能集成化设计的基础理论，探索考虑磁性元件功能集成的电机驱动系统模型与控制方法，揭示功率变换器容量限制对电机运行区间以及机械特性曲线的影响，研究电机磁场变化引起功率变换器电流波动的机理和抑制方法。本项目有望突破电动汽车现有技术的性价比瓶颈，具有重要的学术价值和应用前景。

本项目提出了基于功能集成化磁性元件的电励磁磁通切换电机驱动系统。其中集成化磁性元件作为电机励磁元件建立电机磁场的同时，还作为DC-DC变换器的电感，实现功率变换器和电机在功能层次上的集成。通过磁性元件功能复用，减少系统中磁性元件的数量，从而提高系统的功率密度，并降低成本。本项目将研究功率变换器与电机功能集成化设计的基础理论，探索考虑磁性元件功能集成的电机驱动系统模型与控制方法，揭示功率变换器容量限制对电机运行区间以及机械特性曲线的影响。本项目有望突破电动工具，家用电器等领域的性价比瓶颈，具有重要的学术价值和应用前景。