电动汽车电能回馈系统,本文以研制应用于电动汽车的数字化永磁无刷直流电机低速能量回馈系统为工程背景展开。着重分析了当永磁无刷直流电机低于其空载额定转速时电磁制动和能量回馈的原理，介绍了一种低速能量回馈制动的简单控制方法。-Electric vehicle electric energy feedback system, this paper to research and application of digital electric vehicle permanent magnet brushless DC motor low energy feedback system is expanded as engineering background. Focuses on the analysis of the principle when the permanent magnet brushless DC motor is lower than its no-load speed when the electromagnetic brake and energy feedback, introduces a simple control method of a kind of low energy feedback braking.