流 √ √ √ Ⅰ参考 电流 Ⅱ段跟踪电流 √ Ⅱ段电流 √ √ √ Ⅱ参考 电流 Ⅰ段跟踪电流 √ 5. 仿真结果 根据前文对分段电磁弹射器的理论分析结合所述的控制方法对其进行了实验研究。
定义动子前进方向的最前端端线相对定子绕组的位置为动子位移。
由图3可见动子按照A相、C相、B相的顺序进入第二段定子的绕组所以应依此顺序次给第二段绕组供电。
为了实现两段弹射器总推力的平稳性采用电流跟踪器Ⅱ给逆变器Ⅱ提供参考电流使第二段弹射器每相的电流跟踪第一段弹射器对应相的电流。
经过短时间的调节后两段弹射器对应相的电流大小基本保持一致。
当动子刚好进入第二段弹射器时电流跟踪器Ⅱ停止工作两段弹射器分别采用各自的三相电流作为控制器的参考电流。
当动子位移为l13τ时动子将按照A相、C相、B相的顺序依次退出第一段弹射器所以应依此顺序切断第一段弹射器绕组的供电。
同样为了实现两段动子所受推力的平稳性采用电流跟踪器使第一段弹射器的相电流跟踪第二段弹射器对应相的电流。
可以看出在逐相切断第一段弹射器的相电流过程中其三相电流与第二段的三相电流基本保持一致。
图4为弹射器的推力变化曲线在交叠处因为动子覆盖第一段弹射器绕组的数目在减少推力逐渐减小相反第二段弹射器的推力则逐渐增加它们的合成推力虽然伴有微弱的波动但也基本保持平稳。
图5为动子的速度响应曲线动子速度在交叠段达到了给定速度并且由于采用了模糊PI调节器速度的响应较快且没有超调。
-4- http://www.paper.edu.cn 00.050.10.150.20.250.30.350.40100200300400500600700800tsFN FePMLSM I FePMLSM II Fe 图4 两段电机的推力及其合力 Fig.4. RepulsiveForce of the Two Section and the Total Force 00.050.10.150.20.250.30.350.400.511.522.533.54tsvem/s Fuzzy PIPI 图5 动子速度响应曲线 Fig.5. Response Curve of Mover’s Speed 6. 结论 应用PMLSM作为电磁弹射器可以把电能直接转换为机械能且具有高推力密度、高效率、良好伺服性能等优点。
本文设计了一种用于电磁弹射的分段结构的PMLSM系统采用SVPWM控制方法。
通过在动子穿越交叠段时采用电流跟踪方法使两段弹射器对应相的电流基本保持一致实现了推力的平稳控制。
与传统采用PI调节器的系统存在超调量相比该电磁弹射器采用模糊PI调节器控制动子速度提高了速度响应的快速性减小了超调量。
应用文中所述控制方法对分段结构弹射器进行实验研究。
结果表明所提方案的正确性与可行性。
参考文献 1 Thornton R.D. Clark T. Perreault B.. Linear synchronous motor propulsion of small transit vehicles. Proceedings of the 2004 ASMEAEEE Joint Rail Conference pp.101-107 April 2004 2 D. Patterson A. Monti C. W. Brice R. A. Dougal R. A. Dougal S. Dhulipala et al. “Design and simulation of a permanent-magnet electromagnetic aircraft launcher”. IEEE Trans. on Industry Applications vol. 41 no.2 pp. 566-575 March 2005 3 Shangguan Xuanfeng Li Qingfu Yuan Shiying Jiao Liucheng. “Analysis on running process of permanent linear synchronous motors with discontinuous stators”. Journal of Xi’an jiaotong university vol. 38 no.12 pp.1292-1300 December 2004 4 K. Seki M. Watada S. Torii and D. Ebihara “Discontinuous arrangement to long stator linear synchronous motor for transportation system” Proc. IEEE conf. on Power electronics and drive systems pp. 697-702 1997. -5- http://www.paper.edu.cn Fuzzy-PI Controller for the Long-move-distance Linear Motor with Repulsive Force Li Liyi1 Song Liwei1 1 Department of Electrical Engineering Harbin Institute of Technology Harbin PRC 150001 Abstract With the propulsive force and efficiency requirements of the electromagnetic launch system permanent magnetic linear synchronous motor PMLSM is investigated in the launching system. In this paper the long primary short secondary PMLSM used in electromagnetic launch system is designed whose winding in the primary is divided into two sections. The control system employs two inverters and two current trackers and the latter are adopted to track the 3-phase currents in the other section when the mover is in the cross section so as to make the magnetic field excited by the two windings move forward smoothly and the repulsive force steady. With regard to the system nonlinearity and model variation the fuzzy PI regulator is designed to adjust the mover velocity. In contrast to the conventional PI regulator the results show that the repulsive force is steady and the velocity reaction is quick without overshoot in the cross section. The method proposed here is validated by the results. Keywords: LSM Section Control Fuzzy PI Regulator -6-
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