内嵌式永磁同步电机定子电流矢量最佳弱磁轨迹控制策略
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摘要
针对电动汽车用内嵌式永磁同步电机(IPMSM)在高温高速下永磁体可能发生不可逆退磁的问题,提出一种定子电流矢量最佳弱磁轨迹控制策略。首先采用等效磁路法计算气隙磁密和永磁体负载工作点,校核永磁体最大退磁工作点并计算得出永磁体的退磁电流临界值;然后结合内嵌式永磁同步电机弱磁控制原理,得出退磁电流临界曲线。据此以最大电流输出曲线、退磁电流临界曲线和最大功率输出曲线为边界提出一种最佳弱磁轨迹;仿真结果证明了该控制策略的正确性和可行性,并在电流限制范围内极大提高了电机调速范围,保证了大扭矩、高功率的输出,改善了电机的动态和稳态性能。
A control strategy of optimal flux-weakening trajectory for the stator current vector was put forward to solve the problem that the interior permanent magnet synchronous motor(IPMSM) for electric vehicles may be irreversibly demagnetized at high temperature and high speed. First, the equivalent magnetic circuit method was used to calculate the air-gap flux density and load working point of permanent magnet, and then the maximal demagnetizing working point of permanent magnet was checked, from which the demagnetizing critical current of permanent magnet was calculated; Second, the critical current was combined with the principle of flux-weakening control of the IPMSM to work out the critical curve of demagnetization current; Then an optimal flux-weakening trajectory was proposed with its boundary composed of the maximum current output curve, the critical curve of demagnetization current and the maximum power output curve; The simulation results proved that the control strategy is correct and feasible, and greatly extends the speed range of motors within a predetermined current range, thus ensuring the output of large torque and high power and improving the dynamic and steady-state performance of motors.
A control strategy of optimal flux-weakening trajectory for the stator current vector was put forward to solve the problem that the interior permanent magnet synchronous motor(IPMSM) for electric vehicles may be irreversibly demagnetized at high temperature and high speed. First, the equivalent magnetic circuit method was used to calculate the air-gap flux density and load working point of permanent magnet, and then the maximal demagnetizing working point of permanent magnet was checked, from which the demagnetizing critical current of permanent magnet was calculated; Second, the critical current was combined with the principle of flux-weakening control of the IPMSM to work out the critical curve of demagnetization current; Then an optimal flux-weakening trajectory was proposed with its boundary composed of the maximum current output curve, the critical curve of demagnetization current and the maximum power output curve; The simulation results proved that the control strategy is correct and feasible, and greatly extends the speed range of motors within a predetermined current range, thus ensuring the output of large torque and high power and improving the dynamic and steady-state performance of motors.
引文
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[2] 柴凤,欧景,裴宇龙.双定子锥形永磁同步电机的弱磁研究[J].电工技术学报,2013,28(7):12-18.
[3] 李立毅,于吉坤,曹继伟,等.新型定子结构永磁同步电机弱磁调速性能分析[J].电工技术学报,2015,30(14):86-93.
[4] Hochhalter K,Seiler M.Permanent Magnet Motor or Actuator With Field Weakening Capability:US,US 8072107 B2[P].2011.
[5] Nedjar B,Hlioui S,Amara Y,et al.A New Parallel Double Excitation Synchronous Machine[J].IEEE Transactions on Magnetics,2011,47(9):2252-2260.
[6] B K Bose.A High-performance Inverter-fed Drive System of an Interior Permanent Magnet Synchronous Machine[J].IEEE Transactions on Industry Applications,1987,24(6):987-997.
[7] Tursini M,Chiricozzi E,Petrella R.Feedforward Flux-Weakening Control of Surface-Mounted Permanent-Magnet Synchronous Motors Accounting for Resistive Voltage Drop[J].IEEE Transactions on Industrial Electronics,2010,57(1):440-448.
[8] 郭仲奇,罗德荣,曾智波,等.一种新的内置式永磁同步电机弱磁控制方法[J].电力电子技术,2011,45(3):44-47.
[9] 王贺超,夏长亮,阎彦,等.基于谐振控制的表贴式永磁同步电机弱磁区电流谐波抑制[J].电工技术学报,2014,29(9):83-91.
[10] 盛义发,喻寿益,桂卫华,等.轨道车辆用永磁同步电机系统弱磁控制策略[J].中国电机工程学报,2010,30(9):74-79.
[11] 唐朝晖,丁强,喻寿益,等.内埋式永磁同步电机的弱磁控制策略[J].电机与控制学报,2010,14(5):68-72.
[12] 卢素华,张小波,陈东锁.永磁电机退磁电流分析[C].国家节能环保制冷设备工程技术研究中心2010年国际制冷技术交流会,2010.
[13] 黄松,田娜,纪志成.一种新的自适应变异粒子群优化算法在PMSM参数辨识中的应用[J].电工电能新技术,2016,35(6):67-73.
[14] 朱扣成.内置式永磁电动机宽弱磁调速技术研究[D].沈阳:沈阳工业大学,2015.