共查询到18条相似文献,搜索用时 203 毫秒
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详细分析了电磁耦合无级变速系统的工作原理及其调磁原理,在此基础上,利用有限元法对其进行二维有限单元和三维有限单元的分析,研究了电磁耦合无级变速器的磁场的相关特性及调磁对气隙磁场的影响。根据调磁对气隙磁场的影响,计算得出调磁对该系统效率的影响,研究结果为电磁耦合无级变速系统的控制策略及控制系统开发提供了基础。
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基于电磁耦合无级变速器的混合动力车传动控制 总被引:3,自引:0,他引:3
研究基于电磁耦合无级变速器的混合动力传动系统,分析其基本原理和功率流模型,并对电磁耦合无级变速器的变速比控制目标、工作模式和控制策略进行详细研究,同时设计适用的整车传动控制器框架。为了研究混合励磁的动态控制效果,对混合动力汽车在低速大负载和高速工况下进行初步动力性仿真。通过仿真,分析车速跟踪的控制效果、发动机转速跟踪控制效果、电池组荷电状态的变化曲线、电磁耦合无级变速器的转速和转矩、发动机输出功率、电池组输出功率和行驶阻力功率等的变化规律,并得出直流励磁电流和电磁耦合无级变速器的磁链观测值变化规律。 相似文献
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针对液力自动变速器传动效率低、油耗大、结构复杂的缺陷,提出了一种新型的行星齿轮功率分流式无级变速器,它取消了液力变矩器,在辛普森双行星排变速机构的基础上,通过功率分流并调节发电机输入功率来实现无级变速,该变速器结构简单,传动效率高,具有较高的实用价值。 相似文献
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《中国工程机械学报》2015,(2)
无级变速(CVT)是最理想的传动方案,在众多无级传动方案中能够适应装载机激烈变化的工况、较宽的牵引力和车速变化范围的较少.静液-机械复合传动方案利用行星排将静液传动支路和机械传动支路的动力进行耦合输出,使系统既具有静液传动的无级变速性质又能通过机械传动拓宽变速范围、提高传动效率并增加传动功率,实现了分段无级传动的功能,满足了装载机的动力传动要求.建立了静液-机械无级传动系统的数学模型,利用分段函数表达了无级变速系统总速比与静液速比和机械速比的关系,并用数学方法概括了总速比连续性条件和切换工作换段时静液传动支路速比无突变的条件.运用该数学模型分析了当前三款适合于装载机使用工况的无级传动方案,获得了相应的性能评价. 相似文献
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针对当前金属带式无级变速传动(Continuously Variab le Transm ission,CVT)系统误差的特点,提出基于空域分析法的金属带式无级变速传动误差检测新方法。介绍空域分析法的特点,根据空域数据采集的特点,提出以空间位移坐标代替时间坐标对金属带式无级变速传动进行空域频谱分析的方法,给出应用空域分析理论设计的FMT测量系统,以及应用该系统进行金属带式无级变速传动误差检测的实用效果。 相似文献
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POWER FLOW ANALYSIS AND APPLICATION SIMULATION OF ELECTROMAGNETIC CONTINUOUSLY VARIABLE TRANSMISSION 总被引:2,自引:0,他引:2
LUO Yutao TAN Di MENG Fanzhen 《机械工程学报(英文版)》2008,21(6):48-56
With the structure of two air gaps and two rotors, the electromagnetic continuously variable transmission(EMCVT) is a novel power-split continuously variable transmission(CVT). There are two kinds of power flowing through the EMCVT, one is mechanical power and the other is electric power. In the mean time, there are three power ports in the EMCVT, one is the outer rotor named mechanical power port and the other two are the inner rotor and the stator named electric power ports. The mechanical power port is connected to the driving wheels through the final gear and the electric ports are connected to the batteries through the transducers. The two kinds of power are coupled on the outer rotor of the EMCVT. The EMCVT can be equipped on the conventional vehicle being regarded as the CVT and it also can be equipped on the hybrid electric vehicle(HEV) as the multi-energy sources assembly. The power flows of these two kinds of applications are analysed. The back electromotive force(EMF) equations are illatively studied and so the dynamic mathematic model is theorized. In order to certify the feasibility of the above theories, three simulations are carried out in allusion to the above two kinds of mentioned applications of the EMCVT and a five speed automatic transmission(AT) vehicle. The simulation results illustrate that the efficiency of the EMCVT vehicles is higher than that of the AT vehicle owed to the optimized operation area of the engine. Hence the fuel consumption of the EMCVT vehicles is knock-down. 相似文献
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电动汽车产生的电磁干扰强于传统汽车,尤其是驱动系统产生的共模传导电流不但严重干扰车辆内部电子设备的整车运行,还向周围环境辐射强烈的电磁干扰。为通过减小驱动系统的共模电流,来降低电动车辆的磁场辐射强度,介绍了阻性耦合、感性耦合和容性耦合,并且给出了在电动汽车布线中减小感性耦合与容性耦合的具体措施;从电池的物理结构和电路模型入手,建立了电动汽车电池组与底盘之间的分布电容模型;着重分析了驱动系统的共模干扰源和共模干扰路径,提出了抑制共模干扰的具体办法;最后进行了电动汽车辐射强度试验。研究结果表明,通过抑制电动汽车驱动系统的共模电流,可以有效抑制车辆的磁场辐射强度,使车辆满足GB/T 18387对电动汽车磁场辐射发射限值的要求。 相似文献
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CVT轻度混合动力系统电动机和发动机联合工作模式下的系统效率优化 总被引:1,自引:0,他引:1
进行无级变速器(Continuously variable transmission, CVT)轻度混合动力电动汽车关键部件效率的试验数值建模,基于效率数值模型和系统的纵向动力学方程,分析推导出混合动力电动汽车驱动工况不同工作模式下的系统效率计算公式,得到了系统效率优化模型,利用序列二次规划算法对CVT轻度混合动力电动汽车驱动工况的系统效率进行优化计算,从而确定了驱动工况不同工作模式下的最佳电动机/发电机输出功率和最佳CVT速比,为驱动工况下CVT轻度混合动力汽车系统效率的提高和控制策略的优化提供了方法和依据。 相似文献
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概括了矿井提升同步电动机的电磁、结构等方面的设计要点。在电机电磁设计方面,说明了对于变频电源特点,如何选择电机容量、额定电压,确定极对数、定子铁心外径及气隙磁密、定子线圈每相串联匝数和定子铁心长度等初步设计需要考虑的问题。进而对详细计算进行说明。在结构设计方面,分别对定转子的组成和定转子线圈结构特点进行了介绍。 相似文献
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With the improvement of vehicles electrical equipment, the existing silicon rectification generator and permanent magnet generator cannot meet the requirement of the electric power consumption of the modern vehicles electrical equipment. It is di cult to adjust the air gap magnetic field of the permanent magnet generator. Consequently, the output voltage is not stable. The silicon rectifying generator has the problems of low e ciency and high failure rate.In order to solve these problems, a new type of hybrid excitation generator is developed in this paper. The developed hybrid excitation generator has a double-radial permanent magnet, a salient-pole electromagnetic combined rotor,and a fractional slot winding stator, where each rotor pole corresponds to 4.5 stator teeth. The equivalent magnetic circuit diagram of permanent magnet rotor and magnetic rotor is established. Magnetic field finite element analysis(FEA) software is used to conduct the modeling and simulation analysis on double-radial permanent magnet magnetic field, salient-pole electro-magnetic magnetic field and hybrid magnetic field. The magnetic flux density mold value diagram and vector diagram are obtained. The diagrams are used to verify the feasibility of this design. The designed electromagnetic coupling regulator controller can ensure the stable voltage export by changing the magnitude and direction of the excitation current to adjust the size of the air gap magnetic field. Therefore, the problem of output voltage instability in the wide speed range and wide load range of the hybrid excitation generator is solved. 相似文献
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Intelligent vehicle electrical power supply system with central coordinated protection 总被引:1,自引:0,他引:1
The current research of vehicle electrical power supply system mainly focuses on electric vehicles (EV) and hybrid electric vehicles (HEV). The vehicle electrical power supply system used in traditional fuel vehicles is rather simple and imperfect;electrical/electronic devices (EEDs) applied in vehicles are usually directly connected with the vehicle’s battery. With increasing numbers of EEDs being applied in traditional fuel vehicles, vehicle electrical power supply systems should be optimized and improved so that they can work more safely and more effectively. In this paper, a new vehicle electrical power supply system for traditional fuel vehicles, which accounts for all electrical/electronic devices and complex work conditions, is proposed based on a smart electrical/electronic device (SEED) system. Working as an independent intelligent electrical power supply network, the proposed system is isolated from the electrical control module and communication network, and access to the vehicle system is made through a bus interface. This results in a clean controller power supply with no electromagnetic interference. A new practical battery state of charge (SoC) estimation method is also proposed to achieve more accurate SoC estimation for lead-acid batteries in traditional fuel vehicles so that the intelligent power system can monitor the status of the battery for an over-current state in each power channel. Optimized protection methods are also used to ensure power supply safety. Experiments and tests on a traditional fuel vehicle are performed, and the results reveal that the battery SoC is calculated quickly and sufficiently accurately for battery over-discharge protection. Over-current protection is achieved, and the entire vehicle’s power utilization is optimized. For traditional fuel vehicles, the proposed vehicle electrical power supply system is comprehensive and has a unified system architecture, enhancing system reliability and security. 相似文献