基于单电流传感器的永磁同步电机混合脉宽调制技术  

Mixed Pulse Width Modulation Technology of Permanent Magnet Synchronous Motor Based on Single Current Sensor

作　　者：田里思 宗耐龙 刘立伟 张珈铭 胡东方 Tian Lisi;Zong Nailong;Liu Liwei;Zhang Jiaming;Hu Dongfang(School of Electrical Engineering China University of Mining and Technology,Xuzhou 221116 China)

机构地区：[1]中国矿业大学电气工程学院,徐州221116

出　　处：《电工技术学报》2025年第8期2451-2463,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上资助项目(62373363,62373359)。

摘　　要：针对采用单电流传感器的永磁同步电机在低调制区与扇区边界区的重构死区问题,该文提出一种将改进的正三角形脉宽调制法与测量相位后移调制法结合的混合脉宽调制策略,在有效实现死区内电流重构的同时,突破传统正三角形脉宽调制无法单独实现电机中高转速运行的局限性。同时针对单电流传感器分时采样所导致的重构误差问题以及补偿过程过于复杂的问题,提出一种新的特殊点电流采样策略,通过固定电流传感器两次采样时刻与采样间隔,使传统的两步电流补偿简化为一步电流补偿,在提高电流重构准确性的同时简化了控制算法,显著提升了电机的控制性能。Permanent magnet synchronous motors are widely used in industrial production and other fields due to their advantages of high power density,high reliability,and high efficiency.Real-time and accurate three-phase current feedback is the key to AC drive system control.Compared with the traditional multi-current sensor drive control,using a single current sensor to achieve three-phase current reconstruction can reduce costs and improve the reliability of the motor system under complex working conditions.Combined with the improved IRTPWM algorithm and the BSPWM algorithm,this paper forms a hybrid pulse width modulation algorithm to solve the low-key brake dead zone and the reconstructed dead zone at the sector boundary.Then,an improved two-point sampling strategy is adopted to eliminate the second type of time-sharing sampling error and simplify the current compensation step,which fixes the sampling time of the two samples and the sampling spacing as the minimum sampling time.Based on the traditional RTPWM algorithm,the improved IRTPWM algorithm calculates the action time of the other two effective voltage vectors.The action time of the vector is fixed with the least influence on the synthetic reference voltage vector among the three vectors,and the three effective voltage vectors and zero vectors are recorded.It collects the phase current at the beginning and end of the optimal measurement vector.The traditional RTPWM algorithm cannot achieve medium and high-speed operation alone.The measurement phase backward shift modulation method(BSPWM)is proposed to eliminate the dead zone of current reconstruction by combining the measurement phase backward shift modulation method and the IRTPWM algorithm outside the working area of the IRTPWM algorithm.The mixed pulse width modulation algorithm can complete the current acquisition twice at two fixed particular sampling points,and the first type of time-sharing sampling error only needs to be compensated.Therefore,the current compensation steps of the traditional mixed pulse w

关 键 词：永磁同步电机 单电流传感器 重构死区 混合脉宽调制 电流补偿 

分 类 号：TM341[电气工程—电机]