| 1. | World veterans federation , wvf
世界退伍军人联盟 |
| 2. | World veterans federation , wvf
世界退伍军人联盟 |
| 3. | But wvf can only control the air - gap flux and can not adjust the torque
调压调频控制只控制了电机的气隙磁通，而不能调节转矩。 |
| 4. | Some simulation models are also used in other wvf control strategy systems
其中的一些仿真模块也可用于其它控制策略的变频调速系统中。 |
| 5. | The simulation result has proved this two wvf systems has better static and dynamic performances
仿真结果证明这两个变频调速系统具有良好的动态、静态性能。 |
| 6. | In the process of close - loop vector - control system , the author designed a model of current delay - loop pwm vector - control wvf system which includes speed and magnetic double close - loops and rea lized it in simulink
在闭环控制系统的仿真中，设计了一个速度、磁链闭环的电流滞环型pwm变频调速系统，并且使这个闭环系统在simulink中加以实现。 |
| 7. | This thesis analyzes the control principles of energy regulating ways in reefer units , compares the merits and demerits of these control methods in the outside working conditions of the changing burthen , and then puts forward the wvf , a entirely new energy saving regulative and control method . in addition , the thesis educes the heat response factors of container ' s round wall constructions by analyzing the dynamic heat transfer and adopting the method of heat response factors , and illustrates the refrigerated container ' s characteristics through an experiment on an empty refrigerated container
本文通过分析目前冷藏集装箱的能量调节方式，比较了这些控制方式在箱外负荷变化的情况下的能量调节优缺点，在此基础上提出全新的变频能量调节控制方式：通过对冷藏箱围壁结构的动态传热性能的分析和热反应系数法的应用，得出了各围壁结构的热反应系数；通过冷藏箱空箱降温实验分析了制冷系统在空箱打冷时系统的特性。 |
| 8. | Vector - contorl wvf system of asynchomous motor is a high performance speed - control system and has been used in a lot of situations of high precision and high performence . in the base of vector - control , some control methods are developing , for example speed - sensorlesss control and self - adaptation control
矢量变换控制的异步电动机变频调速系统是一种高性能的调速系统，已经在许多需要高精度、高性能的场合中得到应用。以矢量变换为基础的许多控制方法，诸如无速度传感器控制、自适应控制等正在发展中。 |
| 9. | This thesis make a study on vector - contorl wvf system of asynchronous motor . in the course of study , making use of the mathematical model of asynchomous motor in mt axes . then both open - loop control system and close - loop vector - control system are respectively simulated with simulation block simulink in matlab
本文对异步电动机变频调速系统进行了研究，利用异步电动机在二相同步旋转mt坐标系下的数学模型，使用matlab中的仿真工具箱simulink分别对开环控制系统和闭环矢量控制变频调速系统进行了仿真。 |
| 10. | Suction gas pressure goes up as the compressor run at the lower speed in the lower burthen , and this is beneficial to lower systems energy - consume . when the system is controlled by wvf , the discharge change of the evaporator is not linear ; the electronic expansion valve is adopted to regulate the system superheat degree , and the controlled object is parameter time varying , accordingly , the time varying controller should be adopted
在负荷较小时，压缩机采用低速运转，吸气压力升高，这对系统降低能耗是有利的；变频控制时，蒸发器制冷剂流量的变化并非线性；系统中采用电子膨胀阀进行过热度控制，被控对象具有参数时变的特性，相应地宜采用变结构的控制器。 |
