| 1. | Pulse width modulation control system ; pwm control system
脉冲调宽控制系统 |
| 2. | Pulse frequency modulation control system
脉冲调频控制系统 |
| 3. | The paper introduces the design of digital variable - frequency induction motor speed modulation control systems , based on fpga
本文提出了一种采用现场可编程门阵列( fpga )器件实现数字化变频调速控制系统的设计方案。 |
| 4. | The thesis tries to solve the problems in two ways : carrier wave modulation control methods and deadbeat control methods as well as some theoretic problems discussed
本文从载波调制控制和无差拍控制两个方面进行了尝试，并对一些理论问题进行了一些探讨。 |
| 5. | Furthermore , cpld design is the necessary step for the verification of asic design . in this paper , several cpld speed modulation control systems and ip are presented
本文设计的几种cpld调速控制系统以及几个ip核，一部分下载到芯片，通过实际验证；一部分通过仿真验证。 |
| 6. | This dissertation proposes a new approach to nonlinear active and reactive power modulation control design for multi - infeed hvdc systems , which realizes the emergency power support to ac system in the presence of large disturbances occurred in ac system
将己有的基于线性方法的有功及无功调制策略由单馈入直流输电系统推广至多馈入直流输电系统，并提出一种非线性的有功及无功调制方法。 |
| 7. | These illuminate that voltage vector control of a low power tow phase inverter - fed induction motor driver as a pulse width modulation control of a two - phase inverter - fed induction motor driver system can effectively cancelled the low harmonic and improve the system performance
相对于方波等其它供电方式的控制，采用电压空间矢量技术在小功率两相异步电动机的变频调速控制上的应用可使转矩脉动减少，效率提高，具有一定的经济性和实用性。 |
| 8. | The study has completed the design of two - phase inverter and made up of the two - phase inverter - motor system for experimental use it is a variable frequency adjustable speed system with a open - loop control of rotational speed , which consists of voltage - controlled oscillator circulating assign device inverter circuit and two - phase induction motor a accurate mathematical model is set based on the whole system , and simulator program of dynamic and steady condition is established , which is used to calculate the dynamic and steady performance by kron and symmetrical coordinate converter by simulator calculation and experimental research with specific parameter of the system , a comparison is made between predicted and experimental characteristics , experimental measurements are shown to compare closely with corresponding theoretical result it is compared with some variable frequency adjus table speed system comprising inverter and single - phase induction motor from the system efficiency torque pulsation and the effect of two - phase inverter capacitance based on the conclusion , harmonic cancellation pulse width modulation control of a two - phase inverter - fed induction - motor drive system is researched , which cancelled the low harmonic and improve the system performance
通过对电机的kron变换和对称分量变换，建立了系统较精确的数学模型，编制了系统动态及稳态运行的仿真计算程序分别计算系统的动态和稳态性能。通过对系统的具体参数进行了仿真运算和实验研究，实验和仿真结果进行比较，说明实验和理论较为一致，并从系统效率、转矩脉动及两相逆变器电容的影响等方面与各种逆变器和单相异步电动机组成的变频调速系统加以比较。在此基础上，对两相逆变器供电-异步电动机系统使用谐波抑制pwm控制进行了研究，由于减少了低次谐波，改善了系统性能。 |
| 9. | This paper expatiated that the mathematics models of ac motor is higher order , non - linear and closed coupling , multivariable input - output system . and introduces the principle and the algorithm of sine pulse width modulation ( spwm ) , opened - loop space voltage pulse width modulation control ( svpwm ) and field oriented control ( foc ) . finally , realized the control strategies of variable - frequency speed regulating using assembly and c language
文中阐述了交流异步电机的数学模型是高阶、非线性、强耦合的多变量输入输出系统,介绍了交流电机的正弦脉宽调制、开环电压空间矢量的u / f控制和磁场定向控制的原理及控制算法,并利用dsp构成控制系统,通过汇编语言和16位定点c语言混合编程的方法实现了上述的变频调速控制策略。 |
| 10. | Our results show that pmd induces pulse broadening randomly in high bit - rate optical fiber communications ; the synchronous amplitude modulation control may correct directly any position change of timing jitter and soliton interaction , so the transmission distance and pulse quality will increase further
研究结果表明对于高速率传输系统， pmd对脉冲的影响在时域上表现为脉冲形状的展宽，这种展宽是随机的；而同步幅度调制是在时域上，将发生形变的脉冲通过振幅调制，恢复原形，从而提高脉冲的传输性能。 |
