CAJ | 학술논문

为了实现永磁同步电机的无速度传感器矢量控制，采用改进的磁链观测器法，用低通滤波环节代替纯积分环节，减小了初值误差及直流偏置误差，同时在极坐标系下对定子磁链幅值及相位进行补偿，实现转速和转子位置的准确估算。针对带载情况下无法自启动的问题，采用I-f控制自启动方法，避免了启动过程中出现过流情况。设计了一种新的切换方式，给定坐标角度按加权函数切换至位置观测值，同时相应改变定子电流给定值，保证电机平滑可靠地从I-f控制方式切换为矢量控制方式。实验表明，控制系统能够可靠稳定运行，切换过程平滑，控制性能良好。
위료실현영자동보전궤적무속도전감기시량공제，채용개진적자련관측기법，용저통려파배절대체순적분배절，감소료초치오차급직류편치오차，동시재겁좌표계하대정자자련폭치급상위진행보상，실현전속화전자위치적준학고산。침대대재정황하무법자계동적문제，채용I-f공제자계동방법，피면료계동과정중출현과류정황。설계료일충신적절환방식，급정좌표각도안가권함수절환지위치관측치，동시상응개변정자전류급정치，보증전궤평활가고지종I-f공제방식절환위시량공제방식。실험표명，공제계통능구가고은정운행，절환과정평활，공제성능량호。
In order to realize sensorless vector control of permanent magnet synchronous motor, a novel method based on improved flux observer was adopted. A low-pass filter was used instead of a pure inte-grator, which reduced the errors caused by the initial value and DC offset. The magnitude and phase er-rors of the stator flux linkage introduced by the low-pass filters were compensated in the polar coordinate to make accurate estimation of speed and rotor position. In order to start motor successfully under the load conditions, a start-up method called I-f control was used, which can avoid the problem of overcurrent. A new switching strategy was also adopted. The given position was switched to the estimated according to weighting function. At the same time the given stator current was changed accordingly. It ensured that motors could switch from I-f control mode to vector control mode smoothly and reliably. The experimental results verify that the sensorless control system can work reliably and stably with smooth switching process and good control performance.