CAJ | 학술논문

无机械速度传感器的交流驱动控制技术具有成本低及可靠性高的特点.无速度传感器控制技术需要对电机内部状态变量如磁链和转子速度进行估计.通常,转子速度的估计只有通过定子电压和电流的检测获得.开环速度估计器的鲁棒性因电机参数变化较差,为了提高抵抗参数变化和信号噪音的鲁棒性,采用闭环观测器估计电机的状态变量以及对电机的参数进行在线辨识.然而,根据无传感器控制文献可知,电机在低速稳定运行时存在困难,解决的方法必须采用电机的寄生效应,即为电机提供附加的状态信息如转子齿谐波电压等.给出了近年来报道的改善交流电机低速估计性能的若干解决方案的要点及一些在无传感器条件下观测的结果并进行了分析,从而对进一步研究提出可能新颖的建议.
무궤계속도전감기적교류구동공제기술구유성본저급가고성고적특점.무속도전감기공제기술수요대전궤내부상태변량여자련화전자속도진행고계.통상,전자속도적고계지유통과정자전압화전류적검측획득.개배속도고계기적로봉성인전궤삼수변화교차,위료제고저항삼수변화화신호조음적로봉성,채용폐배관측기고계전궤적상태변량이급대전궤적삼수진행재선변식.연이,근거무전감기공제문헌가지,전궤재저속은정운행시존재곤난,해결적방법필수채용전궤적기생효응,즉위전궤제공부가적상태신식여전자치해파전압등.급출료근년래보도적개선교류전궤저속고계성능적약간해결방안적요점급일사재무전감기조건하관측적결과병진행료분석,종이대진일보연구제출가능신영적건의.
The speed controlled AC drives without mechanical speed sensors have the attraction of low cost and high reliability. The sensorless control techniques require the estimation of internal state variables of the machine like the linkage fluxes and the rotor speed. Generally, the estimation of the rotor speed is achieved through only the measurement of voltages and currents. Robustness of the open loop speed estimators is poor due the parametric variation therefore, to improve the robustness against the parameters and signal noise, the researches employ closed loop observers for the estimation of the state variables as well as the on-line identifi-cation of the motor parameters. However, it is well know in the literature on sensorless control that operating the motor at low frequency is challenging and that the solution will have to exploit parasitic effects of the ma-chine, that furnish additional information on the state of the motor, like the rotor slot harmonic voltages. A digest of some solutions recently reported to improve the performance in low-speed estimation and some results about the observability of the AC motor in sensorless conditions were presented, and proposals, maybe novel ideas, for their future research were put forward.