参数在线估算的永磁同步电机最大转矩电流比控制

Maximum-torque-per-ampere control of permanent magnet synchronous motors with online parameter estimation

在矢量控制坐标变换的基础上,针对内置式永磁同步电动机(IPMSM)d、q轴电感不相等的特性,对内置式永磁同步电动机最大转矩电流比控制方法进行了研究。用极值原理推导出在输出转矩一定时所需要的最小d、q轴电流应满足的关系式。在系统容量相同的情况下,相对于id=0控制显著提高系统的低速转矩及动态性能。在此基础上,进一步考虑到电感饱和效应,对电机关键参数Ld、Lq进行了在线自适应估算,给出了适于工程应用的近似算法并应用于工程实践。最后对id=0控制、最大转矩电流比控制进行了试验对比,结果表明:该方法可有效提高系统的转矩输出能力,具有很好的工程应用性。

According to the characteristics that d,q-axis inductances are not equal in interior permanent magnet synchronous motors（IPMSM）,introduced a maximum-torque-per-ampere（MTPA） control scheme,which can get a larger torque output under certain current condition.A relationship about the minimum d,q-axis currents required under certain torque output was derived by the maximum principle.In same capacity,relative to id=0 control,this method could significantly improve the low-speed torque and dynamic performance of the system.Moreover,the inductance saturation effect was considered,the parameters Ld and Lq of the motor were online adaptive estimated,and an approximate algorithm for engineering applications was presented and applied to engineering practice.Finally,experimental results verify the effectiveness and engineering practicability of the proposed approach.