两相导通无刷直流电机直接转矩控制零电压矢量特性分析

doi:10.19595/j.cnki.1000-6753.tces.181512

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摘要无刷直流电机（BLDCM）直接转矩控制（DTC）方法的实现最终落实到电压矢量的选择和发送上,其中零电压矢量的正确定义和使用对电机性能有着至关重要的影响。该文详细分析两相导通无刷直流电机直接转矩控制方法在反电动势非正弦、存在关断相条件下零电压矢量的定义方法,并对所得到的零电压矢量作用条件下电机电流、端电压和转矩变化规律进行理论分析。分析结果指出,零电压矢量选择不当会引起关断相续流二极管续流,从而导致关断相产生负转矩,影响电机性能,背离了两相导通的控制初衷。该文提出一种基于零电压矢量的改进控制方法,根据所提出的新电压矢量选择表,通过合理选择零电压矢量能够有效避免关断相产生转矩,进而改善电机控制性能。实验结果验证了理论分析的正确性以及所提控制方法的有效性。

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关键词 ：无刷直流电机, 直接转矩控制, 零电压矢量, 转矩脉动, 关断相

Abstract：The realization of the direct torque control method of the brushless DC motor is finally implemented to the selection and transmission of the voltage vector, and the correct definition and proper usage of zero voltage vector has a crucial influence on the performance of the motor. In this paper, the definition method of the zero-voltage vector of two-phase conduction brushless DC motor direct torque control method was analyzed in detail under non-sinusoidal back EMF and the turn-off phase. The variation law of motor current, terminal voltage and torque under different zero voltage vectors are analyzed in this paper, which shows that improper selection of zero voltage vectors will cause the turn-off phase fly-wheel diode to conduct, and results in negative torque in the turn-off phase, affecting the performance of the motor. An improved control method based on zero voltage vectors was proposed. According to the proposed new voltage vector selection table, the conduction of the turn-off phase can be effectively avoided by reasonable selection of the zero voltage vectors, which helps to improve the motor control performance. The experimental results verified the correctness of the theoretical analysis and the effectiveness of the proposed control method.

Key words： Brushless DC motor direct torque control zero voltage vector torque ripple turn-off phase

收稿日期: 2018-09-13 出版日期: 2019-12-11

PACS:

TM351

基金资助:国家自然科学基金青年基金（51407095,51607094）、江苏省自然科学基金（BK20151548）、江苏省产学研前瞻性联合研究项目（BY2016001-01）、江苏省“六大人才高峰”项目（GDZB-043）、 “青蓝工程”项目和江苏省研究生科研与创新计划（KYCX18_1223、KYCX18_1225）资助项目

通讯作者: 杨建飞男,1982年生,博士,副教授,研究方向为永磁电机直接转矩控制。E-mail：yjfsmile@njnu.edu.cn

作者简介: 曹伟男,1995年生,硕士研究生,研究方向为无刷直流电机直接转矩控制。E-mail：953927636@qq.com

引用本文:

杨建飞, 曹伟, 李德才, 邱鑫, 刘训. 两相导通无刷直流电机直接转矩控制零电压矢量特性分析[J]. 电工技术学报, 2019, 34(23): 4948-4956. Yang Jianfei, Cao Wei, Li Decai, Qiu Xin, Liu Xun. Analysis on Zero Voltage Vector in Two-Phase Conduction Direct Torque Control of Brushless DC Motor. Transactions of China Electrotechnical Society, 2019, 34(23): 4948-4956.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.181512 https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I23/4948

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