中国电机工程学报2004，Vol.24Issue(3)：145-150,6.
晶闸管控制的感应电机中提高起动电磁转矩的一种新策略
A NEW STRATEGY TO IMPROVE ELECTROMAGNETIC STARTING TORQUE FOR THYRISTOR CONTROLLED INDUCTION MOTORS
赵凯岐 1王毅 1徐殿国 1刘宏伟1
作者信息
- 1. 哈尔滨工业大学电气工程系,黑龙江,哈尔滨,150001
- 折叠
摘要
Abstract
A demerit of conventional soft starters is that a small reduction in voltage gives rise to a considerable drop in electromagnetic torque,which may cause the motor with loads failure to start.This paper presents a new control strategy to improve starting torque.Without changing main circuit of the conventional soft starters,the strategy defines triggering instants of thyristors to include or exclude half cycles of the acpower supply.Therefore,the resultant discrete frequency voltage and current applied to the motor are obtained.For all the frequencies,in order to obtain maximum positive torque, the system is properly unbalanced,choosing the initial phase angle combination of the most positive sequence of three phases.The strategy,similar to that in variable-voltage variable-frequency inverters,makes the motor produce low current impact and high torque.The proposed strategy has been verified experimentally on a laboratory machine using a 32-bit DSPbased soft starter-fed induction motor drive system,and proved to have good starting torque and current performance.关键词
感应电动机/晶闸管/软起动器/电磁转矩Key words
Induction motor/Thyristors/Soft starter/Electromagnetic torque分类
信息技术与安全科学引用本文复制引用
赵凯岐,王毅,徐殿国,刘宏伟..晶闸管控制的感应电机中提高起动电磁转矩的一种新策略[J].中国电机工程学报,2004,24(3):145-150,6.
