1.The flux ripple, the current ripple and the torque ripple of the traditional direct torque control (DTC), indirect torque control based on three phases asynchronous sinusoidal pulse width modulation (ITC) and the direct torque control based on space vector modulation (SVM-DTC) are studied by using of Matlab/Simulink, the advantages and disadvantages of the methods are pointed out.
在完成论文的过程中，基于从整体到局部再到整体的方法论，论文在分析异步电动机各种控制方法的基础上着重研究了传统的直接转矩控制(DTC)、基于三相异步正弦脉宽调制的间接转矩控制(ITC)和基于空间矢量调制的直接转矩控制(SVM-DTC)。
2.Do not allow excessive ripple current to pass. Use the electrolytic capacitor at current values within the permissible ripple range.
通过电解电容器的纹波电流不应超过其充许范围，如超过了规定值，需选用耐大纹波电流的电解电容器。
3.The appearance of ripple of dial make it, through two pellets the scroll between ripple indicates time, be being designed beautifully only so is to let a person fondle admiringly really.
表盘做成波纹的样子，通过两个圆球在波纹间的滚动来指示时间，如此唯美的设计真是让人爱不释手。
4.According to the different back-EMF waveforms of BLDCM, this dissertation gives a detailed analysis to the torque ripple due to trapezoidal EMF, pseudo-sinusoidal EMF, and general shape EMF respectively, and from each one proposes a kind of control technique for torque ripple minimization.
根据永磁无刷直流电动机反电势波形的不同，对方波型无刷直流电动机的换相转矩脉动，准正弦波(pseudo-sinusoidal EMF)反电动势无刷直流电动机以及任意波形反电动势无刷直流电动机的电磁转矩脉动，进行了详细的分析，分别提出三种不同的控制策略，进行转矩脉动抑制控制。
5.Compared with existing modulating method, torque ripple is greatly reduced by uniform modulating in one monocycle, increasing current slope of upcoming conducting phase instantaneously suppresses the torque ripple by 30’ during low speed with obviously lower initiating noise.
采用单周期内各功率管均衡调制的方式，不仅消除了反向电流，而且与其他调制方式相比，可使转矩脉动较小。
6.For APFC with the determinations of the structure, power stage circuit, current modes, control methods and control IC, it can be shown that this traditional APFC has the following disadvantages, i.e. the greater ripple of output voltage, the longer response time of voltage loop and a great deal of switch ripple lying on the input current.
对于已经确定了结构、功率级主电路、工作模式、控制策略及UC3854控制芯片的有源功率因数校正电路,分析表明,这种传统的有源功率因数校正电路存在着输出电压纹波大、电压环响应速度慢和输入电流叠加开关纹波的缺陷。
7.The functions and effect of inductance and capacitance in the circuit of single and double transformer on the current wavcform and ripple factor have been studicd and tested systematically in this paper and it is proved that this power supply without any forms of filter circuit in the sccondary eide of transformer can obtain direct currcnt with stability, no currcnt zero and low ripple factor to satisfy complctely the rcquircmcnt of CO2 lascr when it is conncctcd a single-phase nctwork service.
对电感、电容在单和双变压器电路中的作用及其对电流波形和波纹系数的影响进行了系统的分析和测试，并证明了该电路接入单相网路电源时可在变压器次极端无任何形式滤波电路条件下获得稳定．不过零点且波纹系数小的直流电流完全能满足CO2激光器工作的要求．
8.Study on the the control effect of zero voltage vector in DTC and a modified strategy of DTC of PMSM. The simulation experiment results show that they could restrain torque ripple availably.
研究了零电压矢量在直接转矩控制中的作用和一种改进的永磁同步电机直接转矩控制策略，仿真结果表明将零电压矢量引入控制和改进的策略都能明显抑制系统转矩脉动。
9.Improvement of RF phase ripple by adjusting PFN in BFEL
调整PFN提高BFEL微波相位稳定度
10.Direct Torque Control(DTC) of induction machines(IM),based on hysteresis comparators and selection table,suffers from variable switching frequency and large torque ripple,especially at low speed.
基于磁滞比较器和选择表的感应电机直接转矩控制(DTC),其开关频率可变,且转矩脉动大,特别在低速时。
