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抢先看|CES TEMS 2022年第1期目次及摘要
CES TEMS
Message from Editors
Deputy Editor-in-Chief: Professor Ping Zheng
Guest Editors:
Fengge Zhang, Shoudao Huang, Deliang Liang, Bo Zhou, Xiuhe Wang, Wei Hua， Wenxiang Zhao, Xiaoyong Zhu, Chengde Tong, Jingang Bai, Yi Sui, Mingqiao Wang
Authors: Zhenyao Xu, Qingguo Yu, and Fengge Zhang
Abstract—Bearingless switchedreluctance motor (BSRM) not only combinesthe merits of bearingless motor (BM) and switched reluctance motor (SRM), but also decreases the vibration and acoustic noise of SRM, so it could be a strong candidate for high-speed driving fields. Under the circumstances, a 12/14 BSRM with hybrid stator pole has been proposed due to its high output torque density and excellent decoupling characteristics between torque and suspension force. However, this motor has torque dead-zone, which leads to problems of self-start at some rotor positions and large torque rippleduring normal operation. To solve the existing problems in the 12/14 type, an asymmetric rotor pole type BSRM is proposed. The structure and design process of the proposed motoris presented in detail. The characteristics of the proposed motor is analyzed and compared with that of the 12/14 type. Furthermore, prototype of the proposed structure is designed, manufactured and experimented. Finally, simulation and test results are illustrated and analyzed to prove the validity of the proposed structure.
Design and Key Technology of Oil-Free Centrifugal Air Compressor for Hydrogen Fuel Cell
Authors: Hongjie Zhang, Wenfei Yu, and Wei Hua
Abstract—For a 120kW hydrogen fuelcell system, a centrifugal air compressor with fixed power of 22kW fuel cell isdesigned. Firstly, the the oretical calculation is carried out for theaerodynamic characteristics of a ultra-high-speed permanent magnet synchronous motor, an air compressor, and an aerodynamic foil bearing. Then, a prototype is trial-produced and arelated test bench is built for test verification. Finally, both the simulation and test results indicate that the designed centrifugal air compressor meets the overall requirements of the hydrogen fuel cell system, and the relevant conclusions provide both theoretical and experimental references for the subsequent series development and design of the centrifugal air compressor.
Design and Analysis of a V-Shaped Permanent Magnet Vernier Motor for High Torque Density
Authors: Zixuan Xiang, Weiling Pu, Xiaoyong Zhu, and Li Quan
Abstract—This paper proposes a V-shaped permanent magnet vernier (V-PMV) motor for potential applications in direct drive system. By designing suitable pole slot ratio and adopting the V-shaped PM topology and dummy slots in rotor, the flux leakage canbe avoided effectively. Meanwhile, the high-order harmonics with large amplitude in the air gapmagnetic field are fully utilized and served as the effective working harmonics, which aim at enhancing the output torque and reducing the torque ripple. Moreover, to extensively explore the performance advantages of the V-PMV motor, a multi-objective optimization study is carried out. And, the electromagnetic performances of the V-PMV motors are analyzed and compared in detail. Finally, a prototype machine is built and tested. Both the oretical analysis and experimental results verify the validity of the motorand multi-objective optimization design approach.
Three-dimensional Electromagnetic Characteristics Analysis of Novel Linear Synchronous Motor under Lateral and Yaw Conditions of MAGLEV
Authors: Gang Lv, Zhixuan Zhang, Xiaodong Li Zhen Sun, Kota Watanebe, and Xiaozhuo Xu
Abstract—Dynamic stability analysis of super conducting electro-dynamic maglev train underlateral and yawing motion condition is the key research content. The novel three-dimensional electromagnetic model of integrated linear synchronous motor in electro-dynamicmaglev train with yawing operation condition is proposed, which can not only simultaneously achieve the propulsion, levitation and guidance performances of maglev vehicle, but also analyze the dynamic stability performance of train with yawing condition. The three-dimensional analytical method is introduced for analyzing the electromagnetic force characteristics of the linear synchronous motor with the yawing operation condition. Firstly, the topology structure and operation principle of the linear synchronous motor with yawing attitude are proposed. Secondly, the three-dimensional analytical model and expressions of electromagnetic characteristics are obtained by equivalent circuit method and Fourier decomposition method, such as levitation force, guidance force, propulsion force and yawing torque, etc. Finally, the three-dimensional electromagnetic characteristics ofthe linear synchronous motor are calculated under yawing operation conditions of maglev train, and the correctness of the analytical theory is verified by the finite element analysis and measured data on the test line.
Authors: Jiaxin Li, Jingwen Yan,Chong Di, Xiaohua Bao, and Qinglong Zhu
Abstract—Aiming at the problem of electromagnetic vibration of the water-filled submersible induction motor(WSIM), a method of opening auxiliary slots on the rotor side is proposed toweaken the air-gap field harmonics caused by the rotor slot permeance harmonics. By analyzing the research status of electromagnetic vibration of the WSIM and the composition of the air-gap magnetic field of the motor, the idea that the auxiliary slots mainly affect the air-gap field harmonics by changing the air-gap permeance of the motor is put forward. The mathematical model of air-gap permeance of WSIM is established to simulate the influence of auxiliary slots on the air-gap permeance. Through the parametric analysis of the mathematical model, the change of auxiliary slot size is simulated. The air-gap permeance waveform is decomposed by the two-dimensional Fourier transform, and then the variation of the air-gap permeance harmonics with the size of the auxiliary slot is analyzed. Finally, the finite element simulation model of the WSIM with the auxiliary slots is established, and the waveform of the air-gapflux density of the motor is analyzed to verify the effectiveness of the mathematical model. Meanwhile, the results show that after opening theauxiliary slot, the radial electromagnetic force of the motor was reduced by28.4%.
Comparative Study on Torque Performance of Five-phase Single-Stator and Double-Stator Permanent Magnet Synchronous Motors
Authors: Jing Zhao, You Wang, Jingqi Li, and Hengzai Hu
Abstract—This paper compares the torque characteristics of single stator permanent magnet synchronous motor(PMSM) anddouble-stator PMSM under different split-ratios, air-gap lengths and shaft diameters by finite element method. Firstly, the effects of split-ratio towards the torque characteristics of the two motor structures under different air-gaplengths are researched, the results show that the optimal split-ratios of thetwo motor structures do not change under different air-gap lengths, and the optimal split-ratio of the double-stator motor is greater than that of single-stator, and the torque of the double-stator motor is greater than that of single-stator motor with arbitrary split-ratio under the same air-gaplength; Finally, the effects of the shaft diameter to the torque of the twomotor structures are investigated, obtaining that with the increasing of shaftdiameter, the electromagnetic torque of the single-stator motor is almostunchanged, however, the torque of the double-stator is gradually reduced, when the shaft diameter reached a certain extent, the electromagnetic torque of the double-statormotor is smaller than that of single-stator motor with the split ratio within acertain range, and the torque/quality ratio of the double-stator motor is smaller than that of single-stator motor with their optimal split ratio separately.
Design and Performance Analysis of Axial Flux Permanent Magnet Machines with Double-Stator Dislocation Using a Combined Wye-Delta Connection
Authors: Bing Peng, and XiaoyuZhuang
Abstract—Conventional fractional slot concentrated winding three-phase axial flux permanent magnet machines havean abundance of armature reaction magnetic field harmonics which deterioratethe torque performance of the machine. This paper presents a double-statordislocated axial flux permanent magnet machine with combined wye-delta winding.A wye-delta (Y-△) winding connectionmethod is designed to eliminate the 6th ripple torque generated by air gapmagnetic field harmonics. Then, the accurate subdomain method is adopted toacquire the no-load and armature magnetic fields of the machine, respectively, and the magnetic field harmonics and torque performance of the designed machineare analyzed. Finally, a 6kW, 4000r/min, 18-slot/16-pole axial flux permanentmagnet machine is designed. The finite element simulation results show that the proposed machine can effectively eliminate the 6th ripple torque and greatlyreduce the torque ripple while the average torque is essentially identical to that of the conventional three-phase machines with wye-winding connection.
Numerical Analysis of the Rotational Magnetic Springs for EDS Maglev Train
Authors: GangLv, Yaqing Liu, Zhixuan Zhang, and Xiaodong Li
Abstract—Different from the traditional railway trains, the combined levitation and guidance EDS maglev train is more likely to rotate after being disturbed. Therefore, the rotational electromagnetic stiffnesses are significant operating parameters for the train. In this paper, the different effects of each translational offset generated in the rotational motion on the corresponding rotational electromagnetic stiffnesses in the EDS maglev train are analyzed and calculated. Firstly, a three-dimensional model of the maglev trainis established. Then, based on the space harmonic method and the equivalent circuit of the levitation and guidance circuits, the formulas of rolling, pitching and yawing stiffness are presented. Finally, by comparing with the three-dimensional finite element simulation results, the key translational displacements in therotational motion which has a great impact on the stiffness are obtained. Hence, the three-dimensional analytical formula can be simplified and the computation can be reduced. In addition, the accuracy of the calculation results is verified by comparing with the experimental data of Yamanashi testline.
Authors: Sa Zhu, Jianbo Lu, and Feng Zeng
Abstract—This paper introduces a novel method for fast calculating the electromagnetic forces in interior permanent magnet synchronous machines (IPMSMs) under pulse width modulation (PWM) voltage sourceinverter (VSI) supply based on the small-signal time-harmonic finite element analysis (THFEA), which has been successfully utilized for fast calculating the PWM-induced losses in silicon steel sheets and permanent magnets. Based on the small-signal THFEA, the functional relation ships between high-frequency harmonic voltages (HFHVs) and corresponding airgap flux densities are established, which are used for calculating the flux density spectra caused by each HFHV in the PWM voltage spectra. Then, the superposition principle is applied for calculating the flux density spectracaused by fundamental currents and all HFHVs, which are converted to the electromagnetic force spectra at last. The relative errors between the force densityspectra calculated with the proposed method and those obtained from traditionaltime-stepping finite element analysis (TSFEA) using PWM voltages as input arewithin 3.1%, while the proposed method is 24 times faster than the traditional TSFEA.Authors: Fei Guo, Qiu Chu, Chunyan Li, and Tao Meng
Abstract—The d-axis inductance(Ld) of the negative-salient permanent magnet synchronousmotor (NSPMSM) is larger than the q-axis inductance (Lq). Comparedwith the traditional motor, the NSPMSM has the characteristics of a highoverload capacity, widespeed range, and preventing permanent magnet demagnetization. Positive d-axis current (id)is applied to control positive reluctance torque when running at base speed. When the motor is running at high speed, a relatively small idcan achieve speed expansion and effectively expand the motor flux-weakeningrange. The use of a magnetic bridge to increase the Ld and a W-typepermanent magnet to reduce the Lq is proposed in this articleas a novel NSPMSM rotor structure. Firstly, the working principle of the NSPMSM was determined according to the equivalent magnetic circuit. Secondly, using the finite element method, the influence of motor structure on torque and speed performance of NSPMSM was analyzed, and the motor structure was optimized. Thirdly, the effect ofthe internal power factor angle on the performance of the two motors is analyzed. Finally, the short circuit simulation and analy sisverified that the NSPMSM has a stronger short circuit current suppressionability without sacrificing overload ability.Authors: Zhu Zhang, Yunfan Liu, andJingyuan Wang
Abstract—In order to improve the heat dissipation capability of motor controllerfor new energy vehicles, the water cooled radiator with multiple channels isoptimized in this paper. The heat conduction between the heat source IGBT andthe radiator, the convective heat transfer between the radiator and the coolant,the mechanical strength and the manufacturing cost are comprehensively considered during the optimization process. The power loss and thermal resistance of the IGBT unit are calculated at first, and finite element modelof the radiator is established. On this basis, multi-physics coupling analysis of the water cooled radiator is carried out. Secondly, the sensitivity analysisis applied to verify the influence of structural parameters on the heatdissipation performance of the radiator system. The influence of coolant inletvelocity v, number of cooling ribs n, height of radiator ribs Hon the maximum temperature rise T, the temperature difference ΔT between phase U and W, and the coolant pressure loss ΔP are analyzed in depth, and the optimal range of the structural parameters for heat dissipationis obtained. Finally, an experimental platform was set up to verify the performance of the proposed structure of water cooled radiator for motor controller of new energy vehicle. The results show that the heat dissipation capability of the propose dradiator is improved compared with the initial design.
Authors: Ahmad El Shafei, Saban Ozdemir, Necmi Altin, Garry Jean-Pierre, and Adel Nasiri
Abstract—The power and voltagelevels of renewable energy resources is growing with the evolution of the power electronics and switching module technologies. For that, the need for the development of a compact and highly efficient solid-state transformer is becominga critical task in-order to integrate the current AC grid with the new renewable energy systems. The objective of this paper is to present the design, implementation, and testing of a compact multi-port solid-state transformer formicrogrid integration applications. The proposed system has a four-port transformer and four converters connected to the ports. The transformer hasfour windings integrated on a single common core. Thus, it can integrate different renewable energy resources and energy storage systems. Each port hasa rated power of 25kW, and the switching frequency is pushed to 50kHz. Theports are chosen to represent a realistic industrial microgrid model consisting of grid, energy storage system, photovoltaic system, and load. The grid port isdesigned to operate at 4.16kVAC corresponding to 7.2kV DC bus voltage, while the other three ports operate at 500VDC. Moreover, the grid, energy storage and photovoltaic ports are active ports with dual active bridge topologies, while the load port is a passive port with full bridge rectifier one. The proposed design is first validated with simulation results, and then the proposed transformer is implemented and tested. Experimental results show that the designed system is suitable for 4.16kVAC medium voltage grid integration.
Fault-Tolerant Operation of Five-Phase Permanent Magnet Synchronous Motor with Independent Phase Driving Control
Authors: Yongqing Wei, Mingzhong Qiao,and Peng Zhu
Abstract—The multi-phase motor drivesystem with multiple H-bridge power supply has high fault tolerance, which iswidely used in aerospace, electric vehicle, ship integrated power system andother fields. In this paper, a fault-tolerant control strategy based on decoupling control and stator current compensation is proposed for thepropulsion system of five-phase PMSM with independent neutrals. Firstly, the mathematical model of PMSM is established by using vector space decoupling method; Secondly, a stator current compensation method is adopted to carry outfault-tolerant control after the motor has single-phase and two-phaseopen-circuit faults and the fault-tolerant control system based on decoupling control is established; Finally, the decoupling control model and thefault-tolerant control of stator current compensation are verified by the simulationand experiment. The simulation and experiment results show that the method canreduce the torque ripple caused by the stator winding open-circuit fault, and the operation performance of the motor under fault condition is significantly improved.
【专题征稿】High Performance Linear Machines and Drives
【联合征稿】High Torque Performance Machine Systems
2022国际无线电能传输技术会议（ICWPT2022）征文通知
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