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首页> 外文期刊>IEEE Transactions on Energy Conversion >Low-Speed Sensorless Control With Reduced Copper Losses for Saturated PMSynRel Machines
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Low-Speed Sensorless Control With Reduced Copper Losses for Saturated PMSynRel Machines

机译：饱和PMSynRel机器的低速无传感器控制，可减少铜损

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摘要

Permanent-magnet-assisted synchronous reluctance (PMSynRel) machines are generally well suited for sensorless operation at all speeds since the rotor topology possesses a magnetic saliency. However, magnetic saturation can result in a vanishing differential saliency which renders sensorless control at certain operating points difficult (or even impossible) at low speed. In this paper, an optimization procedure, based on results from finite-element (FEM)-based simulations, is proposed. As output, current reference trajectories are obtained in which copper losses are kept at minimum, while the capability for sensorless control is still maintained. The results from the FEM-based simulations are in good agreement with the corresponding experimental results. For the experimental prototype in consideration, the torque limit when operating sensorless at low speed is increased substantially from below 45% to around 95% of its rated value with only slightly increased copper losses. Additionally, the impact of position-dependent harmonics on the magnetic cross saturation (affecting the steady-state position estimation error) is found to be substantial. This highlights that this spatial variation should be taken into consideration for accurate prediction of performance during sensorless operation even if the winding of the machine is of the conventional distributed type.
机译：永磁辅助同步磁阻（PMSynRel）机器通常非常适合在所有速度下进行无传感器操作，因为转子拓扑具有磁凸度。但是，磁饱和会导致差分显着性消失，这使得在低速下难以（甚至无法实现）在某些操作点进行无传感器控制。在本文中，基于基于有限元（FEM）的仿真结果，提出了一种优化程序。作为输出，可获得电流参考轨迹，在该轨迹中，铜损保持最小，同时仍保持无传感器控制的能力。基于FEM的模拟结果与相应的实验结果非常吻合。对于所考虑的实验原型，低速无传感器运行时的扭矩极限从其额定值的不到45％大幅提高到大约95％，而铜损仅略有增加。另外，发现与位置有关的谐波对磁交叉饱和的影响很大（影响稳态位置估计误差）。这突出表明，即使机器的绕组为传统的分布式类型，在无传感器操作期间，也应考虑这种空间变化，以准确预测性能。

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