[Objective]In the traditional curriculum of Electrical Machinery,students often struggle to grasp abstract theoretical concepts that are fundamental to the subject.These challenges are frequently compounded by methodological constraints that limit the practical application of these theories.Moreover,students may experience a disconnect between the academic material they study and the engineering standards widely used in the industry.[Methods]To address these limitations,this study introduces an innovative educational approach that incorporates real-world data from a transformer factory report,supplied by a collaborative industry partner,as an authoritative reference standard.This initiative aims to bridge the frequently encountered gap between academic theory and practical engineering applications.The paper outlines the development of an innovative experimental setup leveraging the capabilities of two robust software tools:Ansys Maxwell for magnetic field analysis and MATLAB/Simulink for electrical circuit analysis.Within this revised experimental framework,student groups are tasked with constructing models using these tools.The students then engage in a dual-path simulation process,where they not only simulate the electrical machinery but also compare their simulation results against the empirical data from the factory report.[Results]Through this comparison,a data feedback loop is established to meticulously analyze any discrepancies between the simulated outcomes and actual data.This detailed analysis provides valuable insights into the factors causing variations between theoretical predictions and real-world performance.This process not only enhances the students'understanding of the correlation between simulation results and actual product performance but also hones their ability to use multiple tools collaboratively to solve complex engineering problems.The practical implementation of this approach demonstrated that it effectively improves students'capabilities to apply theoretical knowledge to real-world scenarios.The approach also fosters a deeper understanding of the intricacies involved in the design and operation of electrical machinery.Furthermore,this method provides a pragmatic solution for conducting industry-education integrated experiments,especially in situations with limited access to measured operational data.[Conclusions]Integrating industry-standard data into the academic curriculum prepares students better for future challenges they may encounter in their engineering careers,ensuring that they are not only well-versed in theoretical concepts but also adept at applying them in practical,real-world contexts.The students can,thus,develop the necessary skills and knowledge to bridge the gap between academic learning and professional practice.Thus,students can develop into more competent and confident engineers,ready to tackle the complexities of the modern engineering landscape.

Eddy-current sensor-free control based on reusing Hall sensors of a bearingless slice motor system can reduce the volume, cost, weight, and the impact of shear on transmitted liquid. However, the algorithm will fail in the presence of the PM’s third harmonic. Hence, this article presents the eddy-current sensor-free control algorithm based on the two negative sequence coordinate transformation in parallel with different frequencies (TNSPDF). The random and disordered signal in the Hall output is modulated into asymmetrical component about the displacement vector angle through negative sequence coordinate transformation at different electrical frequencies, achieving decoupling between the displacement vector angle and the motor electrical frequency. The interference signal does not lead to any pulsation in the estimated displacement; rather, it evolves into a significant coefficient for the purpose of displacement identification. The validity and effectiveness of the proposed method are verified through experiments on a bearingless permanent magnet slice motor system.

The bearingless slice motor employed in ventricular assist devices must deliver not only ultra-clean operation but also exceptionally low speed fluctuations to ensure precise flow control. While feed-forward compensation for cogging torque within the vector control framework can mitigate these fluctuations, the predictive accuracy of such strategies is limited by existing analytical models. These models, which are grounded in conventional magnetic field modulation theory, often neglect the critical modulation effect of stator saturation, leading to significant errors. To address this gap, this article introduces a novel analytical method for cogging torque based on a synchronous rotation saturation modulation (SRSM) factor. First, the modulation mechanism of the SRSM factor is analyzed. Second, the air gap permeance was reconstructed by introducing the SRSM factor, allowing for the complete and accurate determination of the harmonic pairs that generate cogging torque, thus achieving accurate analysis of cogging torque. Finally, experiments are conducted to verify the effectiveness and correctness of the proposed analytical method.

A virtual simulation experimental platform is designed based on the physical experimental platform by taking the automatic sorting system by multi-robot as a typical case.A special fixture for the sorting robot is designed based on SolidWorks 3D modeling software.PLC program is designed by GT Works software, the human machine interface on touch screen panel is finished based on GT Designer software, the layout of the experimental platform is constructed in ROBOGUIDE simulation software, and the offline programming and simulation of the robot is realized through the virtual teach pendant in the software. The virtual simulation experimental platform breaks the time and space constraints, and it can not only be used as a comprehensive experimental platform of PLC technology, human machine interface configuration technology and industrial robot technology, but also as a practical platform of industrial robot training courses.

Conventional generator system with multiple power sources mostly uses one converter to control one input power source and all the converters are in parallel on the bus finally. This structure makes the control of the power source independently and without interference. However, the number of converters is redundant which reduces the system integrity and stability. This paper compares the system with an open-winding hybrid excitation generator system comprehensively. The voltage and power equation are deduced in the paper. And the speed range, load range, switch number and withstand voltage the system needs is analyzed by the mathematical model. It provides the theory basis for the application of the two systems in different occasions of multiple power sources system.

针对多变量的被控对象采用模糊控制算法时存在着"规则爆炸"问题,提出一种基于融合函数的模糊控制器设计方法.先对一级倒立摆系统进行建模并分析其稳定性和可控性,再设计LQR控制器;接着分析基于融合函数的模糊控制算法并设计模糊控制器;最后利用MATLAB软件对LQR控制和基于融合函数的模糊控制进行仿真研究.仿真结果表明,所设计的基于融合函数的模糊控制器能很好地对倒立摆进行控制,在控制性能、控制精度和抗干扰性方面优于LQR控制,并且具有很好的鲁棒性.

Permanent magnet (PM) machines inevitably suffer from cogging force, which does not contribute to the average output torque (force) but contributes as a type of torque (force) ripple. This paper provides an overview of the cogging force reduction methods for different types of PM machines. First, a systematic and comprehensive categorization of different kinds of cogging force reduction methods is given according to the reduction principle. Then, the cogging force reduction methods for different types of PM machines are analyzed and discussed based on the categorization. Finally, according to the versatility and feasibility of the cogging force reduction methods, practical methods are recommended for different types of PM machines. The categorization, analyses, and recommendations presented in the paper are useful for the design of different types of PM machines with the requirement of cogging force reduction or output torque (force) ripple suppression.

随着汽车行业的"新四化"发展,现有的车辆工程专业课程体系已不能满足行业对汽车类专业人才的培养需求."新工科"建设有力地促进了高校的专业改革与发展,据此分析了独立学院车辆工程专业课程体系现状,重新定位专业人才培养目标,完成特色人才培养的课程体系的构建,"以学生为中心",参考工程认证标准,深化科教融合,实施课程思政,为培养车辆工程专业创新型应用人才提供保障.

Linear flux-switching permanent magnet (LFSPM) machines have high power density and simple robust stator structure,which shows significant potential in long stroke applications. However,linear motors are required to have high thrust density and low thrust ripple in many applications. Therefore,the research on the issues causing the thrust force ripple and corresponding suppression methods are important means to enhance the application potential of the LFSPM machines. Through the finite element analysis (FEA) method,the end effect of LFSPM machine is improved by using different structures of the additional teeth,and the end force is reduced. Based on this,different thrust ripple reduction methods are employed and compared to suppress different thrust ripple components of the LFSPM machine. In the process of comparison,a step (staggered tooth) displacement selection method is given. It shows that each structure can reduce the thrust force ripple while taking into account the average output thrust force. FEA verifies the universality of the proposed method,and it can be used in LFSPM machines with different structures to reduce the thrust force ripple while taking into account the average output thrust.

永磁电机具有效率高、功率密度高、控制灵活的特点,研究永磁电机及其驱动系统的容错技术有利于提升其在电动汽车、新能源发电和航空电力作动系统等领域的应用潜力.对近年来永磁电机驱动系统容错技术领域的研究成果和最新进展进行归纳和总结:系统地将容错电机本体分为"冗余拓扑"设计和"结构优化"设计来进行归纳总结;将容错算法归纳为"基于电流矢量重构技术"和"基于电压矢量重构技术"来进行类比分析;三相和多相逆变器系统容错技术;位置/速度传感器和电流传感器故障容错方案,包括冗余传感器和无传感观测器技术.最后,指出目前容错技术存在的主要问题以及未来发展方向,为永磁电机及其驱动系统容错技术研究工作的进一步开展提供了参考.

DC–DC converters with high dynamic performance are attracting more and more attentions in industry and academia. The charge balance control (CBC) method enables the single-input dc–dc (SIDD) converter system to achieve optimal dynamic performance. In this article, the CBC method for the multiport converter is proposed, and the analogy and the innovative transplantation approach of the CBC from single-input systems to multi-input systems are developed. First, general steps and unified equations of the CBC for SIDD converter are summarized. Second, through analogy analysis, the CBC method is transplanted to a full-bridge three-port converter (FB-TPC) system to improve the dynamic performance under load step change. Third, through innovative transplantation, a CBC strategy based on magnetizing current three-stage regulation is proposed, achieving optimal dynamic performance for the FB-TPC system under power distribution step change. Experimental results on an FB-TPC verify the feasibility and effectiveness of the CBC methods for multiport converter and the transplantation method.

Linear flux switching permanent magnet (LFSPM) motors show significant potential in many applications from urban rail transit, automobile to naval. Direct force control (DFC) methods are always employed for the linear motor driven systems owing to their high dynamic performance and parameter robustness. However, the traditional DFC has the drawbacks of big ripples and nonlinear hysteresis control for both thrust force and primary flux linkage. Two direct force linear control (DFLC) methods based on space vector modulation (SVM), namely, DFLC-SVM1 and DFLC-SVM2, are presented in this paper, where the hysteresis controllers are removed, and the relationship between the electromagnetic force and the thrust angle or its increment is established. Thus, an accurate and linear control of the electromagnetic force can be achieved through SVM. Furthermore, DSLC-SVM2 is simpler than DSLC-SVM1 due to that it does not require electromagnetic force estimation part, only the primary flux estimation is needed. Simulation results verifies the effectiveness of the two methods.

Flux-switching permanent magnet (FSPM) machines can provide high torque density, strong flux-weakening capability, and high reliability, which makes these machines attractive in electrical drive systems. FSPM machines always employ different control methods, such as the vector control (VC) and direct torque control (DTC) methods. These methods exhibit different electromagnetic torque dynamic performances; hence, the dynamic performances of their rotor speeds are different. However,the proportional integral (PI) controllers of the speed loop in these methods are linear regulators, which hardly guarantee the optimal dynamic performance of the rotor speed. This causes the rotor speed to have several adjustments, overshoots, and a relatively long recovery time during the response to a sudden load change. Therefore, to achieve the optimal dynamic trajectory of rotor speed and maintain the excellent performance of the steady-state simultaneously, a torque-current (I-q) integral balance (IQIB) method, which can eliminate the restriction of the PI controllers on the dynamic performance of the rotor speed, is investigated for the VC system of FSPM machines. In the dynamic process, a group of optimal switch vectors is obtained to achieve the shortest recovery time and the minimum number of adjustments for the rotor speed without overshoot, thereby achieving an optimal dynamic performance for the system. Comparative experiments between the IQIB-based VC, VC, DTC, and improved DTC are conducted, and the accuracy and effectiveness of the proposed method are validated.

An open-winding permanent magnet generator (OWPMG) system that offers features like fewer switching devices and high integration can be used in multi-input generator systems. To achieve high-accuracy position sensorless operation for the OWPMG system, this study investigates a phase-shift-free synchronous reference frame filter (SRFF-PSF) for use in the sliding mode observer (SMO) position sensorless algorithm. The proposed SRFF-PSF can completely restore the fundamental component of back-electromotive force (EMF) without phase shift and filter out the high-order harmonics owing to the following two improvements. First, the fundamental phase lag is eliminated by removing the low-pass filter between the back-EMF and the SRFF. Second, the error iteration of the output position angle is avoided by using the synchronous angle information from an additional phase locked loop module for the coordinate transformation of the SRFF. Based on the aforementioned improvements, the proposed method can effectively solve the phase shift problem in position estimation. The correctness and effectiveness of the method are verified by the experimental results.

容错电机以其可靠性高、容错能力强以及恶劣环境工作能力强等优点得到了国内外电机领域广泛关注,其工作原理、拓扑结构、电磁性能和控制策略等已有广泛而深入的研究,研究结果表明该类电机非常适合应用于全电/多电飞机电力作动系统.本文从拓扑结构和控制算法两大方面对电力作动系统用容错电机的关键技术进行分析和总结.在拓扑结构方面,横向比较了每种原型电机引入容错设计后对原有电磁性能的影响,纵向归纳了电机容错设计的通用设计方法和一般规律.在控制策略方面,分析了基于电流矢量重构技术和基于电压矢量重构技术两大类方法的内在联系与优缺点,提出了提高转速动态的容错电机转矩冲量平衡控制,并对代表性拓扑结构和容错算法进行了仿真和实验比较.最后展望了容错电机的研究前景与应用拓展.

For the traditional high frequency (HF) injection methods of bearingless motors, the HF signal is always injected into the armature winding, resulting in large suspension and torque ripples. In order to solve this problem, a general theory of combinations of HF injected auxiliary coils is presented in this paper. This theory aims to eliminate certain harmonics based on the vector superposition theory of the basic excitation vector, and can be employed for bearingless motors of all pole pairs combinations with concentrated windings. It has advantage of less influence on the suspension and torque control. This theory is implemented on a 12-tooth motor, and the correctness is verified by the simulation results using Ansoft.

电力电子技术课程设计作为电气类专业的重点实践课程,需要提高实践环节的教学比重.本文通过设计并制作经典BUCK电路的示教板,给出了完成一个电力电子课程设计案例的流程.学生可以通过该案例完成电路理论计算、仿真分析、PCB绘制、元件选型以及焊接与调试的全过程,提高解决实际工程问题的能力.

The field winding-based flux adjustable permanent magnet (FWFAPM) machines, including the hybrid excitation (HE) topology and the memory topology, can offer excellent capabilities in terms of flux regulation, wide constant power operation as well as de-excitation (flux-weakening) under fault; thus, they are capable for use in More Electric Aircraft (MEA) generator systems. First, this article probes four basic HE modes, and based on that, a general method deriving permanent magnet (PM) machines to HE machines is established. The basic characteristics of each HE mode considering the relationship between S-pole and N-pole are obtained for the first time. The performance differences of each HE mode combined with different PM machines are summarized. Then, this general topology derivation method is extended for the memory topology. The unified derivation method of the single-PM topologies, the double-PM topologies, and the triple-PM topologies for memory machines is systematically established. The general laws of the electromagnetic performance of each double-PM mode and triple-PM mode considering different relationships between NdFeB and AlNiCo are summarized for the first time. Finally, the control strategies for voltage regulation of aircraft generator systems are discussed based on the different critical control variables and controller types; a torque impulse balance control method which shows excellent dynamic performance for both target control variable and critical control variable has been achieved experimentally.

As a new type of electrical excitation synchronous generator, electrical excitation flux switching generator has the field winding and armature winding on the stator. And the brushless control can be more easily managed. Furthermore, it is suitable for the aerospace engineering and hybrid electric vehicles. However, it has lower power density than PM generator due to the electrical excitation. Thus, multi-phase electrical excitation flux switching generator is researched in the paper in order to find the topologies which have high power density and output voltage. The study in the paper provides reference for the topology selection of the generators with uncontrolled rectifier.

磁悬浮直线开关磁阻电机继承了直线开关磁阻电机的优点,结合有效的悬浮设计方案,在磁悬浮运输系统中具有一定的应用潜力.研究了磁悬浮直线开关磁阻电机的悬浮模块及其改进结构,分析磁场分布和磁路模型,在此基础上,利用有限元软件进行仿真,通过结果分析发现所提出结构具有天然解耦的结构特点,可以实现悬浮力控制和推力控制解耦以及悬浮力控制与动子前进位置解耦,通过线性调节悬浮电流即可线性控制悬浮力,使悬浮电流控制为标量控制,大大降低了悬浮控制系统的复杂性.此外,改进结构可以有效提高悬浮电流利用率,减小悬浮绕组损耗.