电机的

The rotors in these motors do not require any induced current so they do not slip backward against the mains frequency.

这种电机中的转子不需要任何感应电机，所以他们不会低于主频。

Motor model under synchronous coordination is established and indirect field oriented control is implemented in the paper.

建立包含电机动态边端效应的同步坐标模型，实现直线感应电机间接磁场定向控制。

The series of low-speed motor is in the house at the same time, the electromagnetic motor-driven institutions and the slowdown in integration as one of the high-tech products.

各系列中低速电机是在电机内部同时将电磁驱动与减速机构融合为一体的高科技产品。

At present,the servomotor is a one-up production in driving motor.

目前，伺服电机是电机驱动中的领先产品。

"If the cranking motor is to be checked with a jumper cable from the cranking motor to the Battery ,first disconnect the distributor primary lead from the ignition coil , and then turn the ignition switch to ON."

如果用连接起动电机和蓄电池的跨接电缆检查起动电机，应把分电器初级线圈从点火线圈上拆下，然后打开点火开关。

"If the crank ing motor is to be checked with a jumper cable from the crank ing motor to the Battery ,first disconnect the distributor primary lead from the ignition coil, and then turn the ignition switch to ON."

如果用连接起动电机和蓄电池的跨接电缆检查起动电机，应把分电器初级线圈从点火线圈上拆下，然后打开点火开关。

In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究，得出了许多有价值的结论，主要概括如下： 1、阐述了目前针对超声电机压电振子的主要建模方法，对压电振子动态特性的研究意义和必要性进行了论述，突出了本文研究内容的迫切性； 2、以压电陶瓷诱发弹性体发生弯曲变形为例，分析了压电陶瓷通过诱发应变来实现机电能量转换的机理；对基于纵弯模式的压电振子的运动及动力传递机理进行了分析； 3、基于模态假定，利用分析动力学的Hamilton原理，建立了面向直线超声电机压电振子的机电耦合动力学模型，并据此建立了压电振子的等效电路模型，导出了电参量与动力学特性参量的耦合方程，为压电振子与驱动电路的匹配提供了依据； 4、从压电陶瓷的本构方程出发，综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程，采用虚位移原理，建立了压电振子动态问题机电耦合场求解的有限元控制方程，为研究其大功率驱动下的非线性本构模型奠定了基础； 5、界定压电振子的动力学特性指标，对压电振子的机电耦合动力学模型参数进行计算及变参数仿真；依据等效电路模型，对压电振子的电学特性进行了仿真分析；通过有限元数值实验，对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析，找出了实现模态简并的激振频率；利用有限元控制方程，通过编程计算，对压电振子的力电耦合场参数进行了详细计算，得出了一些有价值的结论。

Electric machinery ; BLDCM driven systems ; Rate smoothness ; Force ripple ; Robust repetitive control

电机；无刷直流电机驱动的系统；速率平稳性；力矩波动；鲁棒重复控制

The company has the most advanced vacuum cleaner and high-speed series motor production equipment, mainly produce various kinds of smoke and high-speed series motor.

公司拥有最先进的吸尘器及高速串激电机生产设备，主要生产各类吸器和高速串激电机。

Series Y2 three-phase induction motor is defined as totally closed, squirrel cage motors with aluminum frame.

Y2系列电机是广泛应用的全封闭，鼠笼型三相异步电机，为铝质外壳。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。