共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
世界上十大风机制造商,有超过一半的制造商正在进行永磁发电机技术的研究,或是早已向市场推出了永磁发电机产品.通常,最简单的将传统双馈异步发电机转换为永磁发电机的办法就是用同速的永磁发电机和全功率变流器替代现在高速齿轮箱后面的双馈异步发电机,仅需要对风机和机舱布置做很小的设计改动.永磁技术提供了各种不同的概念,从10 r/min到20 r/min的大转矩直驱发电机.同时也提供了各种结构方式,像外转子轴向磁通发电机,永磁励磁使电机同时具有高效、高转矩,因为励磁不需要向系统连续地输入能量.而且,也会产生较低的同步电感,可使电机具有大转矩. 相似文献
4.
5.
6.
7.
对一种新型小功率盘式永磁直流风力发电机的原理和电磁设计进行了分析和推导,利用 Ansoft Maxwell 3D软件对电机的磁场分布和运动情况进行了仿真,其结果可为进一步研究提供参考. 相似文献
8.
9.
永磁同步风力发电机存在产能效率不高的问题,而诠释产能效率的两个分解因素是?效率和输出功率,因此该研究借助一种响应面法(RSM)和存档微遗传算法(AMGA)相结合的优化方法,以改善内部结构参数开展提高发电机产能效率的双目标优化研究。首先建立发电机?平衡模型,确立优化双目标;其次,采用敏感性分析法确定定子内径、气隙长度、永磁体厚度及铁芯长度组合为设计变量,通过Box-Behnken试验设计(BBD)试验设计获得29组样本数据,根据RSM获得输出功率和?效率的回归方程,并经方差分析验证模型可靠性;最后以?效率和输出功率极大为优化双目标,借助RSM和AMGA相结合法进行寻优,得出最佳结构参数,从而提高发电机产能效率,并降低了功率脉动,提升电能品质。 相似文献
10.
以影响发电机温度场分布的齿槽结构为研究对象,基于变工况下的实测值,采取有限元数值模拟法,开展功率为400 W的不同齿槽结构的永磁风力发电机温度场研究。首先,按照测试方案并运用FLIR红外热成像仪采集梨形槽、扇形槽、斜肩圆底槽3种结构发电机在不同工况下的动态温度场,将测试温度值整理后,通过meshgrid(x,y)函数和surf(x,y,z)函数相结合,分别绘制出不同槽型的定子沿径向随负载值大小和位置变化的三维曲面;其次,以所测温度值为计算载荷和边界条件,模拟出不同齿槽结构的温度场;最后,对比分析测试和计算温度场的分布规律,以二者一致且有效的规律为依据,找出产热低、散热强的最优齿槽结构。 相似文献
11.
Jiabin Wang West M. Howe D. La Parra H.Z.-D. Arshad W.M. 《Energy Conversion, IEEE Transaction on》2007,22(2):299-306
This paper discusses issues that are pertinent to the design of a linear permanent magnet generator for application in a free-piston energy converter. To achieve the required high power density, high efficiency, and low moving mass, a tubular machine equipped with a modular stator winding and a quasi-Halbach magnetized armature is employed. It is shown that the machine design can be optimized with respect to three key dimensional ratios while satisfying other performance requirements. It is also shown that, when the generator is interfaced to an electrical system via a power electronic converter, both the converter volt-amps rating and the converter loss should be taken into account when optimizing the machine design. The performance of such a tubular generator is demonstrated by measurements on a 10-pole/9-slot prototype machine. 相似文献
12.
13.
This paper presents a detailed and comprehensive multiphysics design process of an 80 kW, 60 000 r/min high-speed permanent magnet machine (HSPMM) for a micro gas turbine application. First, the preliminary design of the HSPMM is carried out according to the mechanical and electromagnetic theory. Afterwards, the influence of carbon fiber sleeve (CFS) thickness, rotor diameter and core length on rotor stress and rotor dynamics is carefully analyzed to obtain the optimal range of rotor diameter and core length. On this basis, the electromagnetic and power loss characteristics are analyzed in detail to obtain the final design scheme. Fluid-solid coupling model is used to calculate the temperature field of the HSPMM to verify the rationality of the scheme. The rotor thermal stress analysis considering the multi-layer and multi-angle winding of CFS is carried out to obtain the rotor models suitable for prototype and mass production, respectively. Finally, the prototypes are manufactured and tested to verify the reliability of the multiphysics design process. 相似文献
14.
《Energy Conversion, IEEE Transaction on》1987,(1):16-20
Complex demagnetization characteristics of Alnico permanent magnet material forces pole design procedure to rely upon empirical methods. The Alnico material adopts several B-H (flux density-coercive force) curves due to nonhomogenous demagnetization, thereby causing hand calculations for magnet working conditions and generator voltage to be nebulous. A method is presented which yields the magnetic operating characteristics of the Alnico pole and corresponding generator terminal voltage for a given load current. The finite element modeling of the pole is based on a field solution of the magnet's severest previous demagnetization. 相似文献
15.
采用有限元法对大功率永磁直驱风力发电机定子三维瞬态温度场进行计算,得到了电机定子温度场。对发电机进行了型式试验,测试结果与计算的稳态结果较为接近,验证了计算的准确性。结果表明,电机在额定工况下,温升稳定后端部绕组温度高于中间绕组,最高温度点在背风侧的端部绕组,最高温度与平均温度相差16℃左右。将实际风场的风资源数据作为外界条件,对永磁直驱发电机一定时间跨度的瞬态温度进行计算,结果与SCADA系统采集的风力发电机运行数据较为接近,为绝缘系统设计和电机的优化提供了参考。 相似文献
16.
17.
18.
直驱式永磁同步发电系统以其噪声小、可靠性高等优点在风力发电系统中越来越得到重视。对一种采用新型永磁同步发电机的直驱式永磁同步发电系统进行了仿真研究,建立了新型永磁风力发电机组的MATLAB模型,提出了一种基于萤火虫群算法的优化功率分配方法。该方法以减小发电机损耗为目标,能够较大地提高发电机组的效率。仿真结果表明,采用优化功率分配方法的发电机由于能够减小损耗,可以输出更多的有功功率,具有更高的发电效率。研究结果可为新型永磁同步发电机发电效率的提高提供参考。 相似文献
19.
《Energy Conversion, IEEE Transaction on》2008,23(3):860-867