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电气化行业的最新科研集锦(十三)

2023-03-31


01.基于改进迭代田口法的双余度永磁电机优化设计

针对双余度永磁同步电机(DRPMSM)的多目标优化设计问题,本文采用Pearson相关系数分析法,在参数敏感度分析的基础上,提出一种改进迭代田口法的多目标优化设计方法。该方法利用单余度模式下的田口法优化设计结果作为双余度模式下优化因子水平取值的依据,对优化因子的水平取值进行了优化选择。该方法既考虑了各工作模式下的优化设计,又解决了不同水平值之间无法寻优的问题。以800W双余度永磁电机为例,利用有限元仿真,对比分析了优化前后的效率、转矩等关键性能参数,验证了所提优化方法的有效性。最后,加工了实验样机,实验测试结果与优化设计结果有较高的吻合度,证明本文所提出方法可有效解决多余度电机的多目标优化设计问题,拓宽了对于该类电机的优化设计思路。
https://kns.cnki.net/kcms2/article/abstract?v=3HpZxZdrsp1A9GWOwsPRHCOVSt5tfxGKpMO8wuRq4fyu_rA1IgLHr45zqGBua7doFbMOcSDiGtVSc4ujKhxT-kLa-yjnVBeIWj2WTa07MWu67YfC8PoWnKeUXlfa77XigCyEBDM6sZk=

 

02.基于双矢量的并网逆变器无模型预测电流控制策略

为消除并网逆变器模型预测控制对系统参数的依赖,本文提出了一种基于双矢量的并网逆变器无模型预测电流控制(MFPCC)策略。该策略通过计算和存储上一时刻双矢量作用下的电流梯度,更新剩余6个未使用矢量的电流梯度,并结合当前时刻的电流采样值,实现未来时刻的电流预测;进一步利用电流预测的价值函数选取合适的电流梯度及其作用时间,从而得到下一时刻最优的电压矢量。该方法不依赖于任何系统参数、计算量小,且消除了传统MFPCC策略中电流梯度更新停滞现象,降低了输出电流谐波。最后,通过仿真和实验验证了所提方法的有效性和优越性。

https://kns.cnki.net/kcms2/article/abstract?v=3HpZxZdrsp1Pblaf41lFhbog023C-HylQ8U17zqsjkv1sMrJzZAH9DQAMp-CVcmAI37XA6NArB3iNPV5AzX8Ll03P3NYZgVpebJPaYOSxj7jTpzSQAAhr0tQ1fu9IboIQpeo3LKgpwA=
 

03.基于GAF-CapsNet的电机轴承故障诊断方法

针对一维机械振动信号在输入卷积神经网络时无法充分提取相对位置关系的问题,提出一种基于格拉姆角场(GAF)和小尺寸卷积的胶囊网络的轴承故障诊断分类方法。利用格拉姆角场对采集到的振动信号进行编码,可以很容易地进行角度透视,从而识别出不同时间间隔内的时间相关性并产生相应特征图。胶囊网络对小尺寸图像相对位置比较敏感,特征提取具有优势,同时考虑到VGG网络优秀的特征提取能力,在结合胶囊网络和VGG网络的基础上,加入了深度小尺寸卷积层。将格拉姆角场编码的振动图像输入到改进的CapsNet网络进行训练,组成GAF-CapsNet模型对轴承故障进行诊断。该模型在凯斯西储大学轴承数据集上进行试验,结果表明,格拉姆角和场(GADF)编码方式相比格拉姆角差场(GASF)编码效果差,效果较好的GADF-CapsNet有99.27%准确率,较差的GASF-CapsNet也有98.83%,相较其他编码方式和卷积神经网络,该模型性能表现普遍比其他模型具有更高准确率。

https://kns.cnki.net/kcms2/article/abstract?v=3HpZxZdrsp2VOa_dtLs15U_G0czT7HHUO-yztKgP3dUtznLnZ99XU2FGE9XUXvvBFi41qWXssG6YxI64mbj21QUHI1Q9QHc3IBURoSGsw89jTU-GvD_tfrAxWWsZHUuPH89CBvQxtOk=

 

04.双三相永磁同步电机低共模电压模型预测电流控制

针对双三相永磁同步电机模型预测控制中存在共模电压较大、x-y平面上谐波电流较大和控制器计算负担严重的问题,本文提出了一种低共模电压的模型预测电流控制方法。首先,将虚拟电压矢量作为输入控制集,通过具有小共模电压的虚拟电压矢量对x-y平面进行控制。其次,在每个采样周期中,通过计算参考电压矢量位置来减少候选电压矢量的数量。再通过无权重系数的价值函数对候选电压矢量进行评估,选择出最优电压矢量。所提方法有效减少了x-y平面上的谐波电流、消除了价值函数中的权重系数、减少了控制器的计算负担和双三相永磁同步电机驱动系统中固有的共模电压。最后,通过与两种现存的传统模型预测控制方法进行了对比实验,证明了所提方法的有效性。

https://kns.cnki.net/kcms2/article/abstract?v=3HpZxZdrsp2wgys94RVO4H45ri5sz4BRYJIIRMAqaGTZhgnPCfzsE5c5aP2b1Oe22Jk7Kabi_DixkUAZcJEjw00RhJEPnGbj7r7fXa9dsHGL2pzN03ycOQsdiMtAo6sWcLml-CixGjs=

 

05.基于容错齿磁通的五相永磁电机匝间短路故障诊断研究

匝间短路故障是一种常见的电机绕组故障,具有危害大、易扩散、诊断难的特点,是多相容错永磁同步电机研究过程中关注的重点。本文以一台高故障隔离能力五相永磁同步电机为基础,对基于齿磁通的故障诊断方法进行了研究。建立了五相永磁同步电机定子磁路模型,给出了匝间短路故障对绕线齿及容错齿磁通的影响规律。研究了不同绕制方式下探测线圈感应电动势随电机运行状态的变化规律,对各绕制方案的故障识别能力、故障灵敏度、复杂程度等进行了综合评价,提出了基于容错齿磁通的匝间短路故障诊断方法,给出了基于故障标志αi的故障识别和定位方法。研究表明,当电机发生匝间短路故障时,故障相αi值明显降低,剩余健康相αi值接近于1,根据这一特征可以对故障进行准确识别和定位。该方法不依赖傅里叶变换、不受负载和电机转速影响,具有准确度高、鲁棒性强的优点。本文进一步分析了槽口宽度、容错齿长度对故障敏感度和电机性能的影响,给出了兼顾高低匝数短路故障诊断灵敏度和电机性能的尺寸选取方法。

https://kns.cnki.net/kcms2/article/abstract?v=3HpZxZdrsp0RnQGBFeB5-MINg0e8N9PymgOUOfJiHI6wRtmv8d76-wAlxiTU_ElQFruHgGdJNt1t8GUFsfBqqpaCCx5vdRpC0DRardYQKW4_fqH3dmlah4H6AAtjyqb6lmYSn7okeSk=

 

06.变频驱动下双斜槽转子感应电机径向电磁力特性分析

针对变频驱动下双斜槽转子感应电机振动性能研究的不足,本文对变频驱动下双斜槽转子感应电机的径向电磁力展开了细致研究。首先从变频器的输出谐波特性出发,采用解析法分析了气隙磁密成分,并通过分析各个磁密谐波的相互作用得到了径向电磁力的幅值、阶次、频率的表达式。然后采用分层有限元法结合二维快速傅里叶分解,得到了平均径向电磁力的时空分布频谱。通过不同供电方式与不同转子结构下气隙径向电磁力的对比,发现双斜槽转子结构能够有效的削弱由变频供电引入的部分高频附加径向电磁力。最后通过实验对比不同供电方式下电动叉车用双斜槽转子感应电机机壳表面的振动频谱,验证分析的正确性。
https://kns.cnki.net/kcms2/article/abstract?v=3HpZxZdrsp2h1eHVWwsgfwSUrXRuhcWKbVxGltPA9-xWxnfLyXJscxSgPXXfoQW1Gi82ktKRdmGPNMPsXBdH5vunzGp01WLusG0TqjqMQ_DjI5TBQYJ3GG-PYa2LI4uKi29rDbweBqk=
 

07.Mechanical and Thermal Design of an Optimized PCB Motor for an Integrated Motor Drive System With GaNFETs

 PCB motors are a viable alternative to commercial electric motors as they are easy to mass-produce and have low manufacturing costs. Moreover, integrated motor drives have gained popularity thanks to their high power density and ease of installation. However, the mechanical and thermal aspects are challenging due to reduced volume. In this paper, a GaNFET switched integrated motor drive axial-flux permanent magnet synchronous machine with a printed circuit board (PCB) stator is designed. The machine is optimized using a multi-objective, non-dominated sorting genetic algorithm (NSGA-II). Two stator types are designed and manufactured to compare the effect of eddy losses. A method for measuring eddy current losses on PCB stators is proposed and used. A mechanical and thermal solution is proposed and tested. Integrated motor drive with sinusoidal pulsed width modulation (SPWM) is used to drive the motor up to 5000 RPM at a 1 MHz switching frequency. The overall system‘s efficiency is 82% at 0.36 N.m and 90% at 0.18 N.m torque. The system has an output power of 270 W of output power with 59 °C stator temperature that proved the effectiveness of the proposed passive cooling method.

https://ieeexplore.ieee.org/document/9917380

 

08.Adjustable-Flux Permanent Magnet Synchronous Motor Sensorless Drive System Based on Parameter-Sensitive Adaptive Online Decoupling Control Strategy

The parameter variation in sensorless control has a great influence on the estimated position accuracy, while the most existing solutions are unsystematic and increase the complexity of the entire drive system. In this article, a new adjustable-flux permanent magnet synchronous motor (AF-PMSM) sensorless drive system under diverse operating conditions is proposed from the perspective of motor design and control. With the special rotor design of the new AF-PMSM, the influence issue of the parameter variation can be well-resolved. To further improve the estimated accuracy of rotor position and suppress the secondary saliencies harmonics, a parameter-sensitive adaptive online decoupling sensorless control strategy is developed. Consequently, the steady-state and dynamic performances and the variable parameter sensitivity of the motor drive system can be improved. Finally, the experimental results verify the feasibility and effectiveness of the proposed motor drive system.

https://ieeexplore.ieee.org/document/9795064

 

09.Multimode Model Predictive Control for PMSM Drive System

In order to improve the control performance of the motor model predictive control (MPC) system, a multimode hybrid-vector MPC strategy is proposed in this article, which is developed from the conventional double-vector MPC strategy. The proposed method extends the last voltage vector of the previous control period to the present control period according to the relationship between the last voltage vector of the previous control period and the first voltage vector of the present control period. Then, two voltage vectors or three voltage vectors are included in each control period, which forms the concept of the hybrid vector. Since a voltage vector is inherited from the previous control period, the proposed method can achieve better steady-state control performance at a lower switching frequency, considering the two adjacent control periods as a whole. Finally, comparative experiments demonstrate that the proposed method has better steady-state control performance at the same switching frequency.

https://ieeexplore.ieee.org/document/9766371

 

10.Research on Novel Flat Wire Transposed Winding of PMSM for Electric Vehicle

Permanent magnet synchronous motor (PMSM) for electric vehicles is developing higher frequency and speed but triggering a significant increase of eddy current loss. To resolve the eddy current loss issue, a novel flat wire transposed winding composed of double-row multiple parallel strands is proposed. Transposed winding techniques have been proved to be efficient in reducing eddy current loss by preventing the uneven leakage magnetic field induced by high frequency. The proposed transposition further improved this technique in reducing circulating current loss. Taking a 60-kW PMSM as an example, the novel flat wire transposed winding arrangement is carried out. The 3-D field-circuit coupled finite-element models of 360° complete transposed and incomplete transposed winding PMSM are established, and circulating current losses are compared. The analysis results show that incomplete transposed winding has a better performance in reducing the circulating current loss. The transposition method suitable for novel flat wire transposed winding is obtained, and the feasibility of PMSM with novel flat wire transposed winding to reduce winding losses is proven.

https://ieeexplore.ieee.org/document/9857900