负载电压

The thesis illustrates the principle of the and its application in the system, establishes the simulation model of the vector control system of PMSM based on the EKF and successfully realizes the application of the speedless sensor in motor control. Firstly, based on the mathematic model of permanent-magnet synchronous motor, the PMSM vector control system is built. Secondly, the Extended Kalman Filter is designed for the on-line estimation of the speed and rotor position by only using measurements of the motor voltages and currents.

首先，基于PMSM的数学模型，建立了电机的矢量控制仿真模型；其次，设计了扩展卡尔曼滤波器，通过检测电机端电压、相电流对电机转速和转子位置进行在线实时估计，实现了PMSM的无传感器矢量控制；最后，在Matlab7.0环境下进行的系统仿真试验表明，该方法具有优良的转角跟踪特性和较好的转速跟踪特性，同时系统具有较强的抗负载扰动性能和较佳的控制性能。

In this paper,The necessity of frequency tracking in ultrasonic cleaning equipmens is discussed.Based on a introduction on the principle of the mian circuit of the ultrasonic power supply for cleaning equipmens and the principle of PLL ,the output frequency of 74HC4046 is changed by a singlechip measuring the phase difference between volage and current.

本文讨论了超声波清洗机中自动频率跟踪的必要性，在介绍超声波清洗机的主电路原理、PLL锁相环原理的基础上，利用单片机检测超声电源负载的电流、电压的相位差，来改变74HC4046 的输出频率，完成了变步长频率跟踪软件设计。

In this paper,the necessity of frequency tracking in ultrasonic cleaning equipmens is discussed.Based on introduction on the principle of the mian circuit of the ultrasonic power supply for cleaning equipmens and the principle of PLL,the output frequency of 74HC4046 is changed by a single chip measuring the phase difference between volage and current.The software of adaptive tracking technique with varied frequency steps is completed.

讨论了超声波清洗机中自动频率跟踪的必要性，在介绍超声波清洗机的主电路原理、PLL锁相环原理的基础上，利用单片机检测超声电源负载的电流、电压的相位差，从而改变74HC4046 的输出频率，完成了变步长频率跟踪软件设计。

At the maximum luffing position check oil pressure, current and voltage when slewing.

4.2 安全工作负载试验SWL test 4.2.1 在吊臂与水平面成 60°位置处，检测绞车起升，下降动作的速度，油压，电流，电压等。

However, this consumes more power and is undesirable in low power applications.

常规的现有技术泵响应于指示负载已达到预定电压的信号而关闭。

Moreover,the converter provides a full load transient response setting time of less than 5μs and overshoots and undershoots of less than 30mV.

其提供的全负载瞬态响应的建立时间小于5μs，过冲电压小于30mV。

In the end, the waveform and value of electrical potential of winding and armature reaction property curve are gained through electromagnet field calculation, and compare it with the calculation result.

最后，对谐波励磁同步发电机的负载运行进行了计算，得到了基波绕组和谐波绕组的电压大小和波形以及电枢反应特性曲线。

Secondly,this paper makes simulations on PID control,Nonline-PID control and Fuzzy-PID control under step-response and sudden-load change in the case of brush and brushless excitation system.

其次，分别在有刷和无刷励磁系统下，对普通PID、非线性PID和模糊自适应PID三种控制方式在阶跃响应和突变负载的情况下进行仿真，对输出的机端电压进行分析并得出相关结论。

Charge and discharge at rated voltage at +15℃～+35℃ in every 30 seconds for 5000 times via Xe flash tube with discharge resistance of 0.7～1.0Ω.

15℃～+35℃，施加额定电压，充放电间隔30秒，共5000次，放电负载0.7～1.0Ω氙气管。

One explanation of 'smoothing' is that the capacitor provides a low impedance path to the AC component of the output, reducing the AC voltage across, and AC current through, the resistive load.

对&滤波&的一种解释是电容对输出AC元件提供了低阻抗路径，减小了电阻负载上通过的交流电压和交流电流。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐