Improved Maximum-Torque-Per-Ampere Algorithm Accounting for Core Saturation, Cross-Coupling Effect, and Temperature for a PMSM Intended for Vehicular Applications
Improved Maximum-Torque-Per-Ampere Algorithm Accounting for Core Saturation, Cross-Coupling Effect, and Temperature for a PMSM Intended for Vehicular Applications
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DOI：
10.1109/tte.2016.2528505
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发表时间：
2016-02
影响因子：
7
通讯作者：
A. Rabiei;T. Thiringer;M. Alatalo;E. Grunditz
中科院分区：
文献类型：
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作者：
A. Rabiei;T. Thiringer;M. Alatalo;E. Grunditz
本文提出了一种推导永磁同步电机 (PMSM) 理想每安培最大扭矩 (MTPA) 角度的改进方法。该算法考虑了磁芯饱和以及直轴和交轴磁通量的交叉耦合。此外，还研究了各种温度的影响。经证明，该算法可提供非常接近整个工作范围内真实 MTPA 角度的 $d{-}q$ 当前参考角度。研究发现，如果在 MTPA 算法中针对每个优化迭代步骤更新等效电路机器参数（例如 $L_d$、$L_q$ 和 $\Psi_m$）的当前依赖性，而不是在优化中直接考虑，则预测的 MTPA 角度对于所研究的机器来说会低 7°。然而，使用此处提出的 MTPA 角度方法，可以消除这种差异。此外，这里利用衍生的改进算法的结果是，峰值扭矩工作点的损失比没有完全优化的情况低 6%。这使得额定电流下的扭矩增加了 3.6%，从而增强了起飞能力。
This paper presents an improved method of deriving the ideal maximum-torque-per-ampere (MTPA) angle for a permanent-magnet synchronous machine (PMSM). The algorithm accounts for core saturation and cross coupling of the direct- and quadrature-axis magnetic flux. In addition, the impact of various temperatures is also investigated. The algorithm is demonstrated to provide a $d{-}q$ current reference angle that is very close to the real MTPA-angle for the whole operating range. It is found that if the current dependency of the equivalent circuit machine parameters such $L_d$, $L_q$, and $\Psi_m$ is updated for each optimization iteration step in an MTPA algorithm rather than being accounted for directly in the optimization, the MTPA angle is predicted up to 7° too low for the investigated machine. However, with the proposed MTPA-angle method here, this discrepancy is eliminated. Moreover, the consequence of utilizing the derived improved algorithm here is that the losses at the peak torque operating point is 6% lower than without the full optimization. This leads to an enhanced take-off ability by increasing the torque at the rated current by up to 3.6%.