CAJ | 학술논문

针对如何确定占空比调制的永磁同步电机直接转矩控制的零矢量作用时间问题。根据电压矢量与电流转矩分量关系，分析了在不同转速下零矢量作用时电磁转矩的变化规律，引入占空比调制后低速区转矩脉动要小于中高速区转矩脉动。设计了基于占空比调制的永磁同步电机直接转矩控制系统，利用转矩偏差和定子磁链的偏差计算占空比，该方案易于实现，对电机参数误差不敏感。仿真和实验结果表明，该方法结构简单、鲁棒性强，能够明显改善低速性能。
침대여하학정점공비조제적영자동보전궤직접전구공제적령시량작용시간문제。근거전압시량여전류전구분량관계，분석료재불동전속하령시량작용시전자전구적변화규률，인입점공비조제후저속구전구맥동요소우중고속구전구맥동。설계료기우점공비조제적영자동보전궤직접전구공제계통，이용전구편차화정자자련적편차계산점공비，해방안역우실현，대전궤삼수오차불민감。방진화실험결과표명，해방법결구간단、로봉성강，능구명현개선저속성능。
Calculation duty ratio is an important issue in Direct torque control ( DTC) of permanent mag-net synchronous motor ( PMSM) based on the duty ratio modulation. The effect of zero vector on elctro-magnetic torque during all speed range was analyzed on the basis of the relation between voltage vector and torque current component and an important phenomenon was revealed and explained that torque rip-ple in low speed range is less than that in high speed range in DTC based on the duty ratio modulation. A robust DTC method of PMSM based on the duty ratio control was designed in which the duty ratio is cal-culated with the error of torque and flux. The method is simple to implement and insensitive to motor pa-rameter error. Simulation and experiments are carried out and show that the improved DTC based on duty ratio modulation has the advantage of simplicity, robustness and improved performance in low speed.