A Direct Torque Control Method for Inductive Motor with Torque Optimization

doi:10.7652/xjtuxb201612003

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A Direct Torque Control Method for Inductive Motor with Torque Optimization

更新时间：2025-07-09

- A Direct Torque Control Method for Inductive Motor with Torque Optimization
- Vol. 50, Issue 12, Pages: 12-17+44(2016)
- 作者机构：
  
  西安交通大学电子与信息工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201612003
  CLC： TM921.51
- Online First：10 December 2016，
  
  Published：2016
- 稿件说明：
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A Direct Torque Control Method for Inductive Motor with Torque Optimization[J]. 2016, 50(12): 12-17+44.
DOI：

A Direct Torque Control Method for Inductive Motor with Torque Optimization[J]. 2016, 50(12): 12-17+44. DOI： 10.7652/xjtuxb201612003.

摘要

针对传统异步电动机直接转矩控制方法中存在的磁链控制不对称和转矩脉动较大的问题

提出了一种优化的异步电动机直接转矩控制方法。该方法通过重新划分电压矢量对定子磁链和电磁转矩作用的影响范围

改进了电压矢量选择表

使转矩和磁链变化时能正确选择所需电压矢量

以减小转矩脉动

从而避免了传统直接转矩控制方法在选取电压矢量时

忽略转矩增加的必要条件和磁链变化的临界条件的问题; 通过求解转矩脉动公式

推导出最佳转矩误差值

提出了转矩脉动全局最小条件下的占空比计算方法

进一步优化了转矩性能

并给出了定子磁链和电磁转矩的控制推导公式。仿真及实验结果表明

所提方法比传统直接转矩控制策略的系统动态响应速度提高了约30%

同时转矩及电流脉动减小

磁链控制更接近圆形轨迹

具有工程实用价值。

Abstract

A direct torque control method for optimizing the torque performance of inductive motors is proposed to address the issues that the flux control is asymmetric and the torque ripple is large in the traditional direct torque control. First

the voltage vector selection table is improved by redividing the range of the effects caused by voltage vectors on the stator flux and electromagnetic torque

and the required voltage vector is selected to reduce the torque ripple when the torque and the flux linkage change. The method considers the necessary condition that the torque increases and the critical condition that the flux changes when the voltage vector is selected. Moreover

the optimal torque error is derived from the torque ripple formula

and the duty cycle calculation is presented under the condition of the global minimum torque ripple. Then the control formula of stator flux and electromagnetic torque is given. Experimental results and a comparison with the traditional direct torque control method show that the dynamic response of the system is improved by 30%

the torque and the current ripple are reduced

and the flux linkage control is more close to the circular trajectory. It is concluded that the proposed method is applicable to engineering.

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references

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