基于SiC器件的感应电机驱动器设计及性能分析

Design and Performance Analysis for Induction Motor Driver Based on SiC Device

对于感应电机系统而言,功率器件的开关频率是制约其电流环带宽的重要因素之一。传统硅基器件受开关损耗等因素的限制,开关频率已经接近瓶颈。碳化硅(SiC)器件作为第三代半导体器件,具有低损耗、高耐温、高开关速度等优良特性,可以大幅提高功率变换器的开关频率。针对SiC器件电机驱动器进行了设计与研究,首先分析了PWM延时对于电机控制系统电流环带宽的影响,之后对SiC电机驱动器的控制结构、驱动电路等进行了设计与验证,最后通过实验验证了SiC驱动器的性能。随着开关频率的提高,电机控制系统的电流环控制性能不断提升,从而为控制系统提供了较大的电流环带宽裕度。

For induction motor systems,the switching frequency of power devices is one of the important factors that restrict the bandwidth of their current loops.Traditional silicon-based devices are limited by factors such as switching losses,and the switching frequency is close to the bottleneck.As a third-generation semiconductor device,silicon carbide(SiC)devices have excellent characteristics such as low losses,high temperature tolerance,and high switching speed,and which can greatly improve the switching frequency of power converters.The design and research of SiC device-based motor drive were carried out.Firstly,the influence of PWM delay on the current loop bandwidth of motor control system was analyzed.Then the control structure and drive circuit of SiC motor driver were designed and verified.Finally,the performance of the SiC driver was verified by experiments.With the increase of the switching frequency,the current control performance of motor control system is continuously improved,thereby providing a larger current loop bandwidth margin for the system.