原油形式，切碎，脉动直流电流从传统充电器生产效率较低的收费。
The crude form, chopped, pulsating DC current from conventional chargers produces a less efficient charge.
发现了手摇交流发电机演示实验中出现脉动直流电的奇异现象并对此作出了合理的解释。
The phenomenon of a pulsating direct current in demonstrative experiment of hand alternator is founded and the reasonable explanation is presented.
因此，对无刷直流电动机的应用，必须考虑其转矩脉动的抑制问题。
So the compensation of pulsating torque is very importance for the application of PMSMs.
另外，还对滤波器的结构和参数对输出直流电压脉动和发电机相电流波形的影响及相电流谐波进行了仿真分析。
In addition, the thesis analyzes the influence of the filter structure and parameters on the output DC voltage ripple and the shape of phase currents, as well as harmonics of phase currents.
交流发电机输出的直流电动势会有较大的脉动电压。
The DC electromotive force output by AC generator can have quite big pulsating voltage.
依据永磁无刷直流电动机的数学模型及其转矩特性，分析了转矩脉动产生的多种原因，并介绍了各种有效的控制策。
According to the mathematical model and torque characteristics of permanent magnet brushless DC motor, the reasons that give rise to torque ripple have been analyzed in this paper.
在永磁无刷直流电机中，转矩脉动是需要解决的主要问题之一。
To permanent magnetic brushless direct current motors, torque tipple is one of the major problems to be solved.
为抑制飞轮储能系统驱动电机——高转速无刷直流电机能量回馈时的转矩脉动，提高系统的稳定性，提出一种适合高转速飞轮储能单元回馈制动的控制方法。
An energy feedback control scheme was developed for high speed brushless direct current motors used in flywheel energy storage systems to restrain the pulsating torque and improve the stability.
但是，无刷直流电动机运行中存在转矩脉动问题，对实现更精确的位置和更高性能的速度控制有极大影响。
But the BLDCM has the disadvantages of torque pulsation, which is in the way of achieving accurate position and speed of higher performance.
介绍了人工心脏轴流式血泵永磁无刷直流电机换相转矩脉动变化过程。
This paper introduces Commutation torque ripple process of the axial blood pump of an artificial heart brushless DC motor.
本文的研究工作对方波无刷直流电机转矩脉动抑制有积极意义。
The research have positive meaning for the torque ripple control technology utilized in BLDCM.
介绍了无刷直流电机控制系统中的四种PWM调制方式，详细分析了四种不同的调制方式对无刷直流电机换相转矩脉动的影响。
Four PWM modes used in the brushless DC motor control system are introduced and their different influences on the commutation torque ripple of BLDC motors are analyzed in detail.
分析了传统的PWM_ON调制方式对无刷直流电动机在非换相期间由于截止相的反并联二极管续流而导致转矩脉动的原因。
The torque ripple caused by diode freewheeling of the inactive phase during non-commutation state of PM brushless DC motor(BLDCM)when using the PWM_ON type of pulse width modulation was analyzed.
本文从永磁无刷直流电动机的基本工作原理出发，分析了引起转矩脉动的原因并建立无刷直流电动机的动态数学模型。
From the basic operation principles of the permanent magnet brushless DC motor, this paper analyses the producing reasons of torque pulsation and establishes the mathematical model.
高速条件下，无刷直流电动机的电流换向产生严重滞后，导致转矩下降并伴随脉动。
Serious commutation lag occurs when a Brushless DC Motor (BLDCM) operates at high speeds, and this leads to torque decline with ripple.
针对无刷直流电动机的转矩脉动，提出采用不同的PWM调制方式以及不同的重叠换相角减小换相电流所引起的转矩脉动。
According to torque ripple of brushless DC motor, the different PWM modulation mode and overlapping commutation method are used to minimize torque pulsation when current commutation is considered.
分析了永磁无刷直流电机换相原理，提出了一种换相电流预测控制方法以抑制换相转矩脉动。
A commutation current prediction control scheme was proposed in brushless DC motor (BLDCM) to suppress the commutation torque ripples.
仿真实验结果表明该方案是可行的，有效地减抑制了无刷直流电机的转矩脉动，并改善了系统的动、静态运行性能。
Simulation results show that the control method is reliable, reduces torque ripple and has effectively improved dynamic and static operation performances.
主要对永磁无刷直流电动机换相过程进行理论分析，得到引起换相转矩脉动的原因。
The cause of producing the commutation torque ripple was mainly found by means of analyzing the commutation process of permanent magnet brushless DC motor in theory.
但是无刷直流电动机运行中存在转矩脉动问题，对实现更精确的位置和更高性能的速度控制有极大影响。
But it has the disadvantages of torque pulsation, it can't achieve accurate position and speed of higher performance.
本文的主要研究目标就是采用新的控制策略来抑制永磁无刷直流电机转矩脉动。
The objective of this dissertation is to minimize the torque ripple of BLDC motor.
的直流电压的脉动或纹波可以除去用适当的过滤器。
The pulsations or ripple of the DC voltage can be remove with the proper filter.
本文详细分析了在异步调制下，直流电压的二次脉动对逆变器输出电流以及电机转矩的影响。
This paper analyses the influence of the rippled DC voltage to the output voltage of the inverter and the motors.
同时，设计了用于牵引逆变器控制的二次数字陷波器以及低通滤波器滤除直流电压信号的二次脉动。
Simultaneously, the second order notch filter and low-pass filter are designed to filter the second order rippled DC voltage signal.
该论文先介绍了螺旋桨驱动电机的工作原理，分析了无刷直流电机转矩脉动产生的原因及消除或抑制方法。
The work principle of the motor driving airscrew is presented in the dissertation. The reasons and the method of elimination or suppression of torque pulses produced by BLDCM are analyzed.
以矿井直流提升机供电系统为研究背景，对大功率直流电力传动装置，特别是串联12脉动整流电路进行了谐波特性分析。
With the hoist electric net in coal mine as the background, the harmonics characteristics of big DC electric power drives, especially 12-pulse serial converter is analyzed.
本文对于反电动势波形接近正弦的永磁无刷直流电动机，提出一种基于六个离散位置信号的自同步svpwm控制方法，用于抑制电磁转矩脉动。
For the BLDCM which has a sinusoidal back EMF, this paper presents a self-synchronous SVPWM control method using six discrete position signals for minimizing torque ripple.
本文对于反电动势波形接近正弦的永磁无刷直流电动机，提出一种基于六个离散位置信号的自同步svpwm控制方法，用于抑制电磁转矩脉动。
For the BLDCM which has a sinusoidal back EMF, this paper presents a self-synchronous SVPWM control method using six discrete position signals for minimizing torque ripple.
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