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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

43

期数:

2022年01期

页码:

48-54

栏目:

出版日期:

2022-01-09

文章信息/Info

Title:

Direct Torque Control of Switched Reluctance Motor Based on Cubic Torque Sharing Function

作者:

白国长; 吴贺松; 郑鹏

郑州大学机械与动力工程学院;

Author(s):

BAI Guochang;  WU Hesong;  ZHENG Peng

School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China

关键词:

开关磁阻电机; 转矩脉动; 直接转矩控制; 转矩分配函数; 扇区细分

Keywords:

switched reluctance motor;  torque ripple;  direct torque control;  torque sharing function;  subdivide sectors

分类号:

TM352

DOI:

10.13705/j.issn.1671-6833.2021.05.020

文献标志码:

A

摘要:

开关磁阻电机具有结构简单、成本低廉、启动转矩大等优点，但也存在转矩脉动大的缺点。直接转矩控制用于开关磁阻电机虽能降低转矩脉动，但在换相期间存在转矩失控现象，为了避免这种失控现象的发生，需对开关磁阻电机的直接转矩控制进行优化。提出将立方型转矩分配函数与直接转矩控制相结合，其中转矩分配函数以合成瞬时转矩恒定为目标，利用其分配各相在不同位置的期望转矩，通过转矩滞环控制使合成瞬时转矩跟踪由速度闭环控制器输出的指令转矩，以实现均衡换相，从而抑制转矩脉动，并对传统的直接转矩控制6扇区进行细分，通过增加过渡电压矢量对开关表进行优化，结合磁链和转矩双滞环的控制方法避免了转矩失控，最后对控制方法进行数字仿真和实验验证。结果表明：当电机转速达到3 000 r/min，负载转矩为1 N·m时，转矩脉动由原来的112.02%降低至23.32%；当负载转矩为1.5 N·m时，转矩脉动由原来的65.25%降低至34.62%，SRM的转矩脉动小于直接转矩控制的转矩脉动。

Abstract:

Switched reluctance motor (SRM) had the advantages of simple structure, low cost and large star-ting torque, but it also had the disadvantage of large torque ripple. Direct torque control could reduce torque ripple of SRM, but there was torque runaway during commutation. In order to avoid it, it was necessary to optimize the direct torque control of SRM. The proposed paper combined the cubic torque sharing function with direct torque control, which aimed at synthesizing constant instantaneous torque and distributed the desired torque of each phase in different positions. Through torque hysteresis control, the synthetic instantaneous torque was tracked to the command torque output by the speed closed-loop controller to achieve balanced phase commutation and thus suppressed torque ripple, and subdivided six sectors of traditional direct torque control. Switch tables were optimized by adding transition voltage vectors, and torque runaway was avoided by combining magnetic link and torque double hysteresis control methods. Finally, the control method was verified by digital simulation and experiment. The results showed that when the motor speed reached 3 000 r/min and the load torque was 1 N·m, the torque ripple was reduced from 98.56% to 21.24%; When the load torque was 1.5 N·m, the torque ripple was reduced from 58.71% to 19.05%. The torque ripple of SRM was less than that of direct torque control.

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更新日期/Last Update: 2022-01-09