检索范围:
排序: 展示方式:
Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems
Le YANG, Shuo WANG, Jianghua FENG
《机械工程前沿(英文)》 2018年 第13卷 第3期 页码 329-353 doi: 10.1007/s11465-018-0466-1
Electromagnetic interference (EMI) causes electromechanical damage to the motors and degrades the reliability of variable-frequency drive (VFD) systems. Unlike fundamental frequency components in motor drive systems, high-frequency EMI noise, coupled with the parasitic parameters of the trough system, are difficult to analyze and reduce. In this article, EMI modeling techniques for different function units in a VFD system, including induction motors, motor bearings, and rectifier-inverters, are reviewed and evaluated in terms of applied frequency range, model parameterization, and model accuracy. The EMI models for the motors are categorized based on modeling techniques and model topologies. Motor bearing and shaft models are also reviewed, and techniques that are used to eliminate bearing current are evaluated. Modeling techniques for conventional rectifier-inverter systems are also summarized. EMI noise suppression techniques, including passive filter, Wheatstone bridge balance, active filter, and optimized modulation, are reviewed and compared based on the VFD system models.
关键词: variable-frequency drive (VFD) electromagnetic interference (EMI) motor drive modeling EMI noise suppression
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 344-350 doi: 10.1007/s11465-016-0406-x
Researchers have investigated direct drive valve for many years to solve problems, such as fluid force imbalance and switching frequency. The structure of the rotary valve has received considerable research interest because of its favorable dynamic properties and simple structure. This paper studied the high frequency double-servo direct drive rotary valve (DDRV), and proposed a novel structure and drive method satisfying high reversing frequency and adequate quantity of flow. Servo motors are integrated into the valve by the innovative structure, which is designed to equilibrate the unbalanced radial fluid force with the symmetric distributed oil ports. Aside from the fast reversing function of the valve, the DDRV presented high performance in linearity of the flow quantity and valve opening as a result of the fan-shaped flow ports. In addition, a computational fluid dynamics (CFD) method based on Fluent was conducted to verify the flux regulation effect of the height change of the adjustable boss.
关键词: direct drive rotary valve computational fluid dynamics (CFD) flow regulation
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 711-725 doi: 10.1007/s11465-021-0647-1
关键词: variable stiffness actuator variable stiffness module drive module symmetrical structure double-deck grooves expandable electrical system
Effects of elastic support on the dynamic behaviors of the wind turbine drive train
Shuaishuai WANG, Caichao ZHU, Chaosheng SONG, Huali HAN
《机械工程前沿(英文)》 2017年 第12卷 第3期 页码 348-356 doi: 10.1007/s11465-017-0420-7
The reliability and service life of wind turbines are influenced by the complex loading applied on the hub, especially amidst a poor external wind environment. A three-point elastic support, which includes the main bearing and two torque arms, was considered in this study. Based on the flexibilities of the planet carrier and the housing, a coupled dynamic model was developed for a wind turbine drive train. Then, the dynamic behaviors of the drive train for different elastic support parameters were computed and analyzed. Frequency response functions were used to examine how different elastic support parameters influence the dynamic behaviors of the drive train. Results showed that the elastic support parameters considerably influenced the dynamic behaviors of the wind turbine drive train. A large support stiffness of the torque arms decreased the dynamic response of the planet carrier and the main bearing, whereas a large support stiffness of the main bearing decreased the dynamic response of planet carrier while increasing that of the main bearing. The findings of this study provide the foundation for optimizing the elastic support stiffness of the wind turbine drive train.
关键词: wind turbine drive train elastic support dynamic behavior frequency response function
宁玉泉
《中国工程科学》 2004年 第6卷 第12期 页码 27-31
提出一种新型双馈变速凸极同步电机,阐述了它的基本原理和结构,电机的转子采用分裂磁极和正交绕组, 结构简单、可靠。转子绕组由低频交流变频电源供电,使电机具有变速恒频的特性。通过原型样机的试验,验证了该项发明的正确性和实用性,它将在大型水电、风电中得到广泛应用。
关键词: 凸极同步电机 变速恒频 交流励磁 双馈
Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation
Yajvender Pal VERMA, Ashwani KUMAR
《能源前沿(英文)》 2012年 第6卷 第2期 页码 184-192 doi: 10.1007/s11708-012-0185-y
关键词: doubly fed induction generator (DFIG) load frequency control inertial control wind energy conversion system (WECS)
Impact drive rotary precision actuator with piezoelectric bimorphs
ZHANG Hongzhuang, ZENG Ping, HUA Shunming, CHENG Guangming, YANG Zhigang
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 71-75 doi: 10.1007/s11465-008-0008-3
关键词: specific fixed-frequency waveform piezoelectric cantilever mechanisms adjustable-amplitude
李洪斌,张承慧,宋军
《中国工程科学》 2001年 第3卷 第9期 页码 52-57
分析了变频驱动并联水泵变压变流量运行优化调度问题的常用建模方法,并比较了各种方法的优劣。 常用的方法是以水泵轴功率作为目标函数,以供水指标和高效区为约束条件。另一种方法是以满足扬程指标时 的实际流量与所需流量之差的二次方作为目标函数,以水泵的高效区作为约束条件。提出了一种新的建模方法, 模型物理意义与实际工况严格相符,具有较高的精度,满足了工程中对水泵切换频率尽量小的要求。仿真结果 表明该方法是有效的。
Solid-state transformer-based new traction drive system and control
Jianghua FENG, Jing SHANG, Zhixue ZHANG, Huadong LIU, Zihao HUANG
《机械工程前沿(英文)》 2018年 第13卷 第3期 页码 411-426 doi: 10.1007/s11465-018-0467-0
A new type of traction drive system consisting of solid-state traction transformer (SSTT), inverter unit, auxiliary inverter, traction motor and other key components is built in order to suit the demand of developing the next-generation electric traction system which will be efficient and lightweight, with high power density. For the purpose of reducing system volume and weight and improving efficiency and grid-side power quality, an efficient SSTT optimized topology combining high-voltage cascaded rectifiers with high-power high-frequency LLC resonant converter is proposed. On this basis, an integrated control strategy built upon synchronous rotating reference frame is presented to achieve unified control over fundamental active, reactive and harmonic components. The carrier-interleaving phase shift modulation strategy is proposed to improve the harmonic performance of cascaded rectifiers. In view of the secondary pulsating existing in a single-phase system, the mathematical model of secondary power transfer is built, and the mechanism of pulsating voltage resulting in beat frequency of LLC resonant converter is revealed, so as to design optimum matching of system parameters. Simulation and experimental results have verified that the traction system and control scheme mentioned in this paper are reasonable and superior and that they meet the future application requirements for rail transit.
关键词: solid-state traction transformer high-voltage cascaded rectifier LLC resonant converter synchronous rotating reference frame carrier-interleaving phase shift control secondary pulsating voltage beat frequency
廖莉,林家恒,张承慧
《中国工程科学》 2002年 第4卷 第9期 页码 54-58
供水企业向来是城市的用电大户,其用电量主要体现在泵站水泵机组的电耗上。供水泵站的高效运行对节约电能、安全供水具有极为重要的意义。文章对供水泵站的效率优化问题进行了探讨,在提出用指数曲线准确地拟合水泵性能曲线的基础上,建立了供水栗站效率优化问题的数学模型,并设计了相应的遗传算法进行求解,仿真实验结果表明了该算法合理、有效。
何惠明,杨晓洲,肖红,范作智,钱良,范光
《中国工程科学》 2012年 第14卷 第2期 页码 59-68
基于煤矿井下变频调速装置与电动机一体式的隔爆型变频调速三相异步电动机实现高效、节能的研发项目,根据传统的感应电动机电磁计算程序增加变频调速电动机的计算方案,并结合ANSOFT 2D有限元针对三相异步电动机的数值分析方法,进行设计核算。详细论述了变频电机的变频调速原理、控制策略,并给出实际样机,介绍其设计与制造技术。
Power control of dual-motor electric drive for tracked vehicles
Yuan ZOU, Chengning ZHANG, Fengchun SUN, Jingbo WU,
《机械工程前沿(英文)》 2010年 第5卷 第1期 页码 67-72 doi: 10.1007/s11465-009-0059-0
An investigation into the vibration of harmonic drive systems
M. Masoumi, H. Alimohammadi
《机械工程前沿(英文)》 2013年 第8卷 第4期 页码 409-419 doi: 10.1007/s11465-013-0275-5
Harmonic drive systems are precise and specific transmission gear systems which are beneficial in terms of the high transmission ratio and almost zero backlash. These inherent and spectacular properties result in using this mechanism in robotic and space sciences where the precision and lightwieght play an important role. This paper presents a vibration analysis of harmonic drive systems using the shell theory. Equations of vibration for the flexspline and the circular spline of the system are derived and used to find the natural frequencies for both parts and, moreover, vibration response of the system under the operating condition is calculated. Also, obtained vibration equations are utilized to study the effects of different involved parameters such as the geometry of the flexspline and its gear tooth, eccentricity, and unbalancing on the vibrational behavior of the system.
关键词: harmonic drive system strain wave gearing mechanism vibration analysis natural frequencies
SCRaMbLE drive application of synthetic yeast genome
Jin Jin, Yuan Ma, Duo Liu
《化学科学与工程前沿(英文)》 2018年 第12卷 第4期 页码 832-834 doi: 10.1007/s11705-018-1749-0
标题 作者 时间 类型 操作
Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems
Le YANG, Shuo WANG, Jianghua FENG
期刊论文
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
期刊论文
Mechanical design and analysis of a novel variable stiffness actuator with symmetrical pivot adjustment
期刊论文
Effects of elastic support on the dynamic behaviors of the wind turbine drive train
Shuaishuai WANG, Caichao ZHU, Chaosheng SONG, Huali HAN
期刊论文
Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation
Yajvender Pal VERMA, Ashwani KUMAR
期刊论文
Impact drive rotary precision actuator with piezoelectric bimorphs
ZHANG Hongzhuang, ZENG Ping, HUA Shunming, CHENG Guangming, YANG Zhigang
期刊论文
Solid-state transformer-based new traction drive system and control
Jianghua FENG, Jing SHANG, Zhixue ZHANG, Huadong LIU, Zihao HUANG
期刊论文
Power control of dual-motor electric drive for tracked vehicles
Yuan ZOU, Chengning ZHANG, Fengchun SUN, Jingbo WU,
期刊论文