控制矢量

The torque ripple in direct torque control system of permanent magnet synchronous motor is analyzed. To decrease the torque ripple in PMSM DTC, a PMSM DTC system based on the strategy of modulating the time of voltage vector is proposed .

讨论了永磁同步电机直接转矩控制转矩脉动问题，针对永磁同步电机直接转矩控制存在较大脉动转矩的缺点，提出了一种模糊调节电压矢量作用时间的永磁同步电机直接转矩控制策略。

Using SPWM control with MCU designed subdivision drive mode of current vector even rotating with uniform amplitude, which can realize multi-kinds subdivision series control by setting software data. The current feedback was also adopted to compensate the error and the precise control to hybrid motor was implemented.

设计利用单片机的SPWM控制的电流矢量恒幅均匀旋转的细分驱动模式，并通过软件实现多种细分驱动控制，在此基础上为修正误差引入电流反馈环节，实现了对混合式步进电动机的精确运行控制。

Since a great deal of mathematical calculation is needed for the vector control system, parameters identification and software real-time filter, realtime control by a lower speed microprocessor will lead to longer sample interval and thus lower down the performance of control.

由于矢量控制系统和参数辨识及软件实时滤波需要大量的数学运算，若选用速度较慢的微机进行实时控制，为实现上述功能则不得不延长采样周期，从而导致控制性能的下降。

This method is to control the stator current as a vector quantity on the basis of slip frequency control .

在这一控制方法中，定子电流在转差频率控制的基础上作为一个矢量进行控制。

Thirdly, the thesis has conducted the simulation research of the three-phase voltage-type PWM rectifier system, has established the simulation models of the main circuit, the space voltage vector PWM control module and PI regulator, and has carried on the simulation for the three-phase voltage PWM rectifier system.

其次，介绍三相电压型PWM整流器的控制方法，深入研究三相电压型PWM整流器的空间电压矢量脉宽调制控制方法，进行三相电压型PWM整流器的PI控制调节器的设计。

Due to these characteristics,it is especially suitable for those situations with high voltage level,High Power and not large speed adjustment range,such as wind machines and pump load. Direct Torque Control which was developed rapidly in the middle of 1980's has been applied to many occasions up to now .

直接转矩控制是80年代中后期发展起来的新型电机调速方法，是继矢量变换控制技术之后，且与之并行发展的一种新型的高性能的交流调速传动的控制技术。

Due to thesecharacteristics,it is especially suitable for those situations withhigh voltage level,High Power and not large speed adjustmentrange,such as wind machines and pump load. Direct Torque Control which was developed rapidly in the middle of 1980's has beenapplied to many occasions up to now .

直接转矩控制是80年代中后期发展起来的新型电机调速方法，是继矢量变换控制技术之后，且与之并行发展的一种新型的高性能的交流调速传动的控制技术。

Based on the basic control theory of permanent magnet synchronous motor,the function of zero voltage vector in the control is analyzed.

摘 要：介绍了永磁同步电动机直接转矩控制基本控制理论，分析了零电压矢量在控制过程中的作用。

Because of lots of space voltage vectors are used impliedly to compose this algorithm, the THD of motor phase current, the ripple of stator flux and torque are lower, and then the drive system torque response can be more quick.

在此基础上分析多相感应电机矢量控制系统和直接转矩控制系统的稳态机械特性和动态转矩过渡过程，用来全面分析、比较这两种高性能控制方法的性能，研究二者的内在联系。

The principle of TDTC and the field-weakening method are introduced. The space voltage vector PWM overmodulation method suiting is adopted. IDTC is extended to the whole speed range. This scheme is proved by experiments.

本文介绍了改进型直接转矩控制的基本原理，加入弱磁控制算法，同时采用一种适合工程应用的空间电压矢量PWM过调制算法，将改进型直接转矩控制扩展到全速度范围。

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。