电机的

The instantaneous current capacity may demonstrate through the nixietube, provides the craft data reference for the operator.8031If the system the setting value carries on again the current capacity actual value the comparison, calculates the control quantity after the PID adjustment operation vi, again transforms into the electric current output signal, after but controls the silicon-controlled rectifier after the enlargement the breakover angle, the realization adjusts the slippery difference electrical machinery magnetic clutch exciting current the function, thus the adjustment implementing agency slippery difference electrical machinery rotational speed, causes to transport on the leather belt the material current capacity to stabilize as far as possible nearby the setting value, and has the good static target and the dynamic performance.

瞬间流量可通过数码管显示出来，为操作人员提供工艺数据参考。8031系统再将流量实际值与其设定值进行比较，经PID调节运算后计算出控制量vi，再转换为电流输出信号，而后经放大去控制可控硅的导通角，实现调节滑差电机电磁离合器励磁电流的功能，从而调节执行机构滑差电机的转速，使输送皮带上的物料流量尽可能稳定在设定值附近，并具有良好的静态指标和动态性能。问题补充：希望大家不要给机器翻译的答案，我想要人工翻译的，谢谢大家了

ABSTRACT: A Rockwell PowerFlex7000 Variable Frequency Drive is used in JiuZHou Electric medium voltage drive test bay as the converter. Because of it belong to the current source drive, it has the function of the four quadrant, it can achieve the energy feedbackmake the motor brake,also has the advanced vector control technology, so it can achieve all kinds of load test, there are no other drives can replace it in simulate motor load. PowerFlex7000 drive has ability to achieve the full load test before the drive leave factory.

摘 要：罗克韦尔PowerFlex7000变频器在九洲中压变频实验站测试系统中作为变流逆变器使用，由于本身属于电流源型变频器，具有四象限运行功能，能够实现能量的回馈和对电机的制动，先进的矢量控制技术，可以实现各种复杂多变的负载特性，在模拟电机负载方面起到了其他变频器无可替代的作用，实现了变频器出厂之前的满负荷测试。

Factory adjustable eccentric block and the fixed angle between the eccentric block of 0 °, then the exciting force for the vibration of the motor nominal excitation force F, the different angle between the exciting force when the table below, paying particular attention to , adjust the excitation force applied, to both ends of the vibrating motor with adjustable eccentric block to adjust in the same direction the same angle.

出厂时可调偏心块和固定偏心块之间的夹角为0°，这时的激振力为振动电机的额定激振力F，不同夹角时的的激振力如下表，要特别注意，调整激振力时，要将振动电机两端的可调偏心块向同一个方向调整相同的角度。

The transient air gap magnetic fields under different conditions are also calculated and analyzed. The novel finite element method directly using magnetic induction as unknown variable has many advantage. It is analyzed theoretically in detail. Nonlinear eddy current field equations and finite element equations using magnetic induction as unknown variable are developed.

直线电机的磁场是一非均匀、非线性的涡流场，文中对非均匀磁场及材料的非线性进行了分析，提出了相应的解决办法，采用以向量磁位为求解量的传统有限元法，对不同合闸角下筒式复合次级圆筒型直线感应电机的瞬态特性进行了计算与试验分析，对不同条件下瞬态气隙磁场进行了研究。

Computer software use the VC++ 6.0 to develop a human-computer interface which can give a control order to the object, print and save the collected data in order to enquiry, deal with abnormal situations and so on. Computer hardware mainly complete the design of electrical control system, including motor-controlled, motor-driven, torque signal- acquisition and the design of interface circuit.

上位机软件采用VC++6.0进行设计，主要用它来开发一个人机交互界面，对试验台发出控制命令、可以打印采集到的扭矩数据并同时将数据进行保存以便查询、对异常情况进行处理；下位机硬件主要完成电气控制部分的设计，包括电机的控制、电机的驱动、扭矩信号的采集和接口电路的设计。

It is well known that rotor parameters of induction motor are subjected to variability and hard to be measured, which will deteriorate performance of control systems based on the mathematical model depending upon rotor parameters, such as rotor flux oriented vector control system, indirect self-regulation.

由于工作原理和材料结构上的原因，异步电机的转子侧参数易变难测，因此所有建立在异步电机动态数学模型基础之上并且利用转子侧参数进行控制的调速系统都或多或少地受到转子参数变化的影响，例如广泛采用的按转子磁链定向的矢量控制系统。

The boost converter is a voltage step-up and current step-down converter .the current source is synthesized from a DC voltage source by adding a large value inductor in series .in DC regulated power supply applications ,the voltage sink represents a large value capacitor in parallel with the load resistance .in the application of the DC motor control ,the voltage sink represents the back emf of the DC motor .the switching action produces a pulsating current .the capacitive filter smoothens the pulsating current and provides a DC voltage to the load

升压转换器是一个升压和降流的转换器。电流源是一个直流电压源添加一个大值电感串联合成的。在直流稳压电源的应用，电压降代表一个大值电容并联一个负载电阻。在直流电机的控制应用中，电压降代表反电动势的直流电机。转换行为产生一个脉动电流。一个滤波电容是这个脉动电流平和并且提供直流的电压负荷。

Based on the analysis of traditional converters, a novel circuit is proposed, what it defers from traditional two switches/phase converter is that it has not dump resistance, and that the rise time and falling time of the phase currents can be effectively reduced, and the torque and output power performance of the system is improved.

在分析了常用的功率变换电路基础上，提出了一种基于双开关功率变换电路的改进电路，该电路与常规双开关功率变换电路的区别在于不需要能耗制动电路，能够利用关断相绕组中储存的能量有效缩短相电流的建立和关断时间，改善SR电机高速运行时输出转矩下降和转矩脉动严重的问题，并且电机的输出功率也得到提高。

A new six-phase disc permanent magnetic synchronous motor which adopts a one-rotor-two-stators configuration was designed. The structure and characteristics were presented . And the design method and parameters were calculated .FEM is used to analyze the magnetic field characteristics of this motor.

设计了一种新型的采用双定子夹单转子的六相盘式永磁同步电机，介绍了它的结构和特点，给出了此电机的设计方法和主要参数的计算，并利用有限元法FEM 对六相盘式永磁同步电动机的磁场特性进行了仿真分析计算。

The theoretical analysis shows the decouple of rotation and levitation. The rotor is actively controlled only in two radial directions and rotation while the other three motions are passively stable owing to the short-span structure.

理论研究表明这种结构的无轴承电机的磁悬浮径向力和电机的转矩是相互解耦的，又因为它是片状永磁转子结构，只须控制转子的两个径向自由度和旋转自由度，其他三个自由度是被动稳定的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。