纯电动汽车用内置式永磁同步电机弱磁控制策略综述

针对纯电动汽车对内置式永磁同步电机（IPMSM）要求有较宽的调速区间,结合内置式永磁同步电机的结构特点,并在内置式永磁同步电机的数学模型基础上,介绍了其弱磁扩速原理。综述了永磁同步电机（PMSM）弱磁控制策略的研究和发展现状,根据每个弱磁控制策略的特点进行分类和归纳,并进行分析。最后对纯电动汽车用永磁同步电机的弱磁控制算法进行展望。     

A mildly exponential approximation algorithm for the permanent

A new approximation algorithm for the permanent of ann ×n 0,1-matrix is presented. The algorithm is shown to have worst-case time complexity exp(O(n ^1/2 log² n)). Asymptotically, this represents a considerable improvement over the best existing algorithm, which has worst-case time complexity exp((n)).Supported by SERC Grant GR/F 90363; work done in part while visiting DIMACS (Center for Discrete Mathematics and Computer Science).Supported by an NSF PYI grant, with matching equipment grant from the AT&T Foundation; work done in part while visiting DIMACS.     

基于自适应模糊反步法的永磁同步电机位置跟踪控制

研究具有参数不确定性的永磁同步屯动机位置跟踪控制问题.利用模糊逻辑系统逼近系统中非线性函数,采用反步设计方法实现永磁同步电动机的自适应模糊控制.所提出的自适应模糊控制器在电机参数不确定和负载扰动的情况下,实现了永磁同步电动机的高性能位置跟踪控制.仿真结果表明了所提出方法的有效性.     

迭代学习的高速伺服系统位置控制策略

针对高速运动伺服控制系统的精确位宣跟踪控制问题,在A型迭代学习控制算法的基础上,提出了一种基于比例一预期迭代学习控制的位置控制策略,并将其应用于建立的交流永磁同步电机模型,最后利用Matlab进行仿真研究。结果表明,此控制策略仅需少量对象信息就能满足系统的性能要求。它与常见迭代学习控制算法相比,具有位置控制精度高、学习收敛速度快等优点。     

Comparison of two novel MRAS based strategies for identifying parameters in permanent magnet synchronous motors

Two model reference adaptive system (MRAS) estimators are developed for identifying the parameters of permanent magnet synchronous motors (PMSM) based on the Lyapunov stability theorem and the Popov stability criterion, respectively. The proposed estimators only need online measurement of currents, voltages, and rotor speed to effectively estimate stator resistance, inductance, and rotor flux-linkage simultaneously. The performance of the estimators is compared and verified through simulations and experiments, which show that the two estimators are simple, have good robustness against parameter variation, and are accurate in parameter tracking. However, the estimator based on the Popov stability criterion, which can overcome parameter variation in a practical system, is superior in terms of response speed and convergence speed since there are both proportional and integral units in the estimator, in contrast to only one integral unit in the estimator based on the Lyapunov stability theorem. In addition, the estimator based on the Popov stability criterion does not need the expertise that is required in designing a Lyapunov function.     

基于模糊神经网络的永磁同步电动机矢量控制系统

该文提供了一种基于自适应模糊神经网络的永磁同步电动机（PMSM）矢量控制系统速度控制器的实施方案。模糊神经网络控制器（FNNC）包括神经网络控制器（NC）和模糊逻辑控制器（FC）两部分，它同时具有神经网络自学习能力和模糊逻辑在处理不确定信息方面的能力。人工神经网络（ANN）的初始权值和阈值通过离线训练的方式获得。在实际的运行过程中，利用模糊控制器的输出对神经网络的权值和阈值进行实时调整。仿真结果表明利用所提出的模糊神经网络来建立永磁同步电动机矢量控制系统的速度控制器，当电机参数改变或者受到外部扰动时，系统具有良好的动态特性。     

无轴承永磁同步电机有限元分析

无轴承永磁电机径向悬浮力与电机绕组结构、永磁体厚度及悬浮力绕组中电流等存在着复杂关系，研究这些关系对电机优化设计具有重要参考价值。该文在介绍了无轴承永磁同步电机径向悬浮力产生原理基础上，推导了径向悬浮力数学模型。用有限元分析和计算方法，讨论了无轴承永磁同步电机在定子绕组相应等效电流作用下，改变径向悬浮力绕组中的电流，电机气隙磁路分布状况；在电机气隙不变，改变永磁体厚度，计算和分析了径向悬浮力与永磁体厚度之间的关系；在电机转矩绕组极对数pM=2不变的情况下，对径向悬浮力绕组采用一对极pB=1和三对极pB=2方式绕制，计算和比较产生的径向悬浮力和麦克斯韦力大小。对pM=2，pB=3的实验样机，在静态悬浮状态下，测试了径向悬浮力和径向悬浮力绕组电流之间的关系，实验结论验证了ANSYS软件计算结果的正确性。     

永磁型无轴承电机的完整系统建模

为实现永磁型无轴承电机的稳定悬浮运行，须对转矩和悬浮力进行实时控制。电磁转矩和磁悬浮力的精确计算是无轴承电机设计及其控制的基础。传统的永磁型无轴承电机数学模型将转矩与悬浮力作为两个独立的系统来考虑，忽略了它们之间的非线性电磁耦合关系，因此计算精度不理想。该文通过虚位移法推导、并建立了考虑转矩绕组与悬浮绕组之间非线性电磁耦合关系及转子运动的面贴式永磁型无轴承电机完整系统数学模型，并通过有限元分析提取了模型中的关键参数。基于此模型实现了转子磁场定向控制的悬浮运行仿真，通过与传统数学模型的仿真结果对比，验证了该模型的精确性与完整性。     

Prediction of the electromagnetic torque in synchronous machines through Maxwell stress harmonic filter (HFT) method

For the calculation of torque in synchronous motors a local method is analysed, based on the Maxwell stress theory and the filtered contributions due to the harmonics of the magnetic vector potential in the motor air-gap. By considering the space fundamental field only, the method can efficiently estimate the average synchronous torque for a variety or motor topologies, including concentrated winding designs. This approach employs an analytical filter for the Maxwell stress tensor and `frozen permeability' technique. The proposed method is validated by comparison with FE results for several synchronous motor types: interior permanent magnet motors, wound field motor, synchronous reluctance motor.     

永磁电机直接驱动变速恒频风力发电控制技术

本文采用永磁同步电机，通过带有中间直流环节的IGBT转换器将电机发出的变频变幅交流电转换成可用的交流电，通过控制整流器电流来控制发电机转速从而控制风力机。