摘要
起动问题自感应电机诞生之日起就是业界研究的重点之一。感应电机常规起动时输出转矩小而起动电流大,对电网、电机拖动的负载及自身绝缘均造成损害。而当采用变频调速时,需要开关器件的裕量足够大,由此带来了成本问题。本文在探究上述情况产生原因的前提下,提出了一种新型预励磁复合控制方案。此方案基于间接矢量控制的思想,预先在电机起动之前建立磁场,将转子磁链定向在电机某相绕组的中心线上,而起动时转换到常规矢量控制算法,从而实现了起动过程中励磁子系统和转矩子系统的动态解耦,电流平滑过渡且输出转矩响应快,避免了以往任何起动方式中的电流尖峰现象发生。最后通过仿真与试验验证了本方案的有效性、可行性。
The research of start-up performance has been an important issue since the invention of inductor motor.By traditional method,the output torque is sufficient and the output current is so heavy that impacting on electrical source,load,insulation,etc.By AC adjusting speed control,the current restriction of the semiconductor devices must be enough,otherwise will be damaged,which increase cost.In this paper,the reason of heavy current in start-up is explained;a new compound method of DC pre-excitation is proposed.Before starting of motor,the controller makes sure that flux linkage is established in some phase of stator,then turn to vector control as soon as motor start-up.The flux component and torque component are decoupled dynamically based on the above strategy.Simulation and experimental results show that the DC pre-excitation is feasible,and current vary smoothly which avoid significant pulse contrast to other start-up method.Meanwhile output torque response is rapid.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第3期29-35,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金委员会创新研究群体科学基金(50477051)
国家高技术研究发展计划项目(863计划)(2008AA8091902)资助项目
关键词
矢量控制
直流预励磁
感应电机
起动
Vector control
DC pre-excitation
inductor motor
start-up
