共查询到20条相似文献,搜索用时 15 毫秒
1.
《Energy Conversion, IEEE Transaction on》2009,24(3):578-586
2.
《Energy Conversion, IEEE Transaction on》2009,24(2):305-313
3.
4.
5.
《Energy Conversion, IEEE Transaction on》2009,24(4):819-825
6.
Mininger X. Lefeuvre E. Gabsi M. Richard C. Guyomar D. 《Energy Conversion, IEEE Transaction on》2008,23(1):78-85
This paper presents two vibration control approaches using piezoelectric inserts applied to a switched reluctance machine (SRM) in order to reduce acoustic emission. The semiactive approach, called synchronized switch damping, consists of a particular voltage processing that increases the electromechanical energy conversion of the piezoelectric insert and leads to effective vibration energy dissipation. Piezoelectric inserts can also be considered as actuators: the active technique aims at imposing an adequate force in order to compensate the structure strain originated by the electromagnetic forces. These two techniques are compared on a single-phase structure mechanically similar to that of an SRM. Advantages and drawbacks depending on the chosen technique are then discussed. 相似文献
7.
以60kW开关磁阻电机系统中采用三相不对称半桥电路的功率变换器为例,设计叠层母排方案,通过电路仿真,研究各部分杂散电感对电路瞬态特性的影响。分析母排设计中各几何因素对杂散电感影响,引入影响因子,对母排设计中各因素的影响程度进行评估。据此,为母排最优设计提供依据。 相似文献
8.
This paper presents a novel numerical method, which will be referred as the position stepping method (PSM), to predict the performances of switched reluctance motor (SRM) drives. The 2D bicubic spline is employed to generate the finite rectangular elements. The 2D bilinear spline is used to model the nonlinear magnetic characteristics in SRMs. Consequently, the conventional nonlinear first-order differential voltage equation for describing the performances of SRM drives can be simplified into an analytical expression in terms of the current with respect to the rotor position. Furthermore, the position stepping algorithm is developed according to the boundary and continuity conditions, to accurately and rapidly compute the current from the proposed current expression. Simulated and measured current waveforms are reported to validate the developed PSM. The CPU execution time required by the PSM compares very favorably with that of the analytical method. Overall, this paper provides an accurate and speedy approach to predict the currents and torques of SRM drives. 相似文献
9.
A new torque estimator for switched reluctance motor (SRM) drives based on 2-D rotary regression analysis is presented in this paper. The proposed torque estimator is composed of a bicubic regressive polynomial as a function of rotor position and input current. The regressive coefficients can be computed offline or online from the torque characteristics acquired either experimentally or from numerical computation. Furthermore, a torque estimation method by taking mutual coupling into consideration is proposed. It can be seen that the estimated and experimentally obtained self-coupling and mutual-coupling torque characteristics are in good agreement with each other. In addition, the dynamic torque waveforms with and without the mutual coupling, estimated by the proposed estimator, are found to be virtually the same as those obtained from the bicubic spline interpolation for SRM drives with single-pulse voltage, hysteresis current chopping, as well as with voltage pulse width modulation control. The success of all the case studies being reported is a good validation of the usefulness and accuracy of the proposed real-time torque estimator that, as described in this paper, can be used to quickly estimate the instantaneous output torque of SRM drives. 相似文献
10.
11.
12.
Shuyan Qi Daqing Zhang Liangdong Guo Libing Wu 《Journal of Dynamical and Control Systems》2018,24(2):269-286
This paper studies the adaptive control problem for a class of switched nonlinear systems with guaranteed prescribed performance bounds under arbitrary switchings. The unknown system functions are approximated by radial basis function neural networks. We employ dynamic surface control technique to solve the explosion of the complexity problem. We control the transformed system such that it is stabilizable, by this way, the original system is stabilizable as well as the prescribed performance is guaranteed. The proposed controller and update laws guarantee the stability of the closed-loop system and the boundedness of all signals. Furthermore, the prescribed performance is ensured. Finally, a simulation example is employed to illustrate the effectiveness of the proposed method. 相似文献
13.
汽油机瞬态工况点火系统的优化控制 总被引:1,自引:0,他引:1
应用微机技术,使汽油机在非爆震区根据发动机的转速和功率由开环控制系统自动寻找点火角度;而在爆震区,则由闭环控制系统对其跟踪调整,至微爆状态。这样,发动机在稳态和瞬态运行都能实现点火系统的最佳控制。本文介绍的正是这种技术在480型汽油机上应用的成果。 相似文献
14.
15.
0引言 最近,我公司经常接到一些出口国外的普通油环产品,对于这种环的弹力修正系数的确定比较复杂,我们采用了一种近似方法求解,介绍如下,仅供参考. 相似文献
16.
17.
汽轮发电机组轴系扭振主动控制模拟实验研究 总被引:5,自引:0,他引:5
在理论分析的基础上建立了国产200MW汽轮发电机转子轴系扭振主动控制模拟试验台,并在该试验台上进行了阻尼减振和主动控制减振等多项实验研究,结果表明主动控制可以有铲地抑制汽轮发电机组轴系的扭振。 相似文献
18.
《Energy Conversion, IEEE Transaction on》1987,(2):246-253
This paper describes principles together with analytical and experimental studies of a speed control system for brushless induction motors of cascade connection in the control range of the slips s1> 1 and s2>1 which was devised by one of the authors. Steady state analyses of the performances of the motor control system are discussed, and results of the tests are presented. It is found that the motor can be controlled widely and comparatively efficiently by controlling the converters which are connected electrically to one of the stator windings of the two motors. 相似文献
19.
20.
汉江喜河水电站表孔弧形闸门控制系统设计 总被引:1,自引:0,他引:1
喜河水电站坝顶设5孔溢流弧形工作闸门。本文在分析溢流表孔弧形工作闸门控制需满足要求的基础上,提出控制系统组成、控制方式的设计以及可实现的控制功能。经过对启动控制柜在出厂前进行的各项功能试验,证明该设计方案可行。 相似文献