Directing at the nonideal trapezoid

Directing at the nonideal trapezoidal back EMF and commutation in BLDC drives, a current optimization control method for torque ripple reduction is proposed in this paper. There are possibly three major considerations in this paper.

First, a reference current optimization method is proposed for the situation where the back EMF is a nonideal trape- zoidal waveform. Reference currents in two-phase conduction mode and commutation mode are optimized, respectively, in accordance with the back-EMF waveforms. In order to obtain back EMF in real time, it was a good choice to construct observers . In this paper, a Luenberger full-order observer is designed to estimate back-EMF waveforms .

Second, during commutation, commutation control with two-phase switching mode or three-phase switching mode is em-ployed to control the currents of noncommutated windings to trace the optimized reference current. The current rate of change of the noncommutated winding and the difference between the reference current and the actual current are used to determine whether the three-phase inverter works in two-phase switching mode or in three-phase switching mode, which avoids the possible wrong selection of control modes only by judging speed in conventional control methods.

Third, variable structure control (VSC) with the advantages of strong broadband noise-suppressing capacity and strong ro-bustness against external disturbances had been widely used in motor drives [25], [28]一【30]. Based on the advantages of VSC mentioned previously, current controllers using integral VSC(IVSC) are employed to realize current optimization control in both two-phase conduction mode and commutation mode.
The control law of IVSC is composed of continuous equivalent component and switch component; therefore, chatting phenomenon in nature is avoided. The proposed method in this paper can reduce torque ripple and can improve the control performance of a motor over a wide-speed range and wide-load range.
The rest of this paper is organized as follows. Section II describes the reference current optimization method in two- phase conduction mode and commutation mode. Section III describes the commutation methods in low- and high-speed modes. Section IV is the design of current controllers using NSC in two-phase conduction mode and commutation mode based on the different switch modulation methods. Section V is the design of a Luenberger full-order observer to estimate back-EMF waveforms in real time. The validity of the proposed method is verified experimentally in Section VI. Finally, the conclusion is given in Section VII.

結果 (中文) 1:

针对非理想梯形反电势和换向无刷直流电机驱动器，本文提出了一种当前的转矩脉动抑制优化控制方法。可能是本文的三个主要考虑因素。第一，为反电势非理想的吹扫捕集 zoidal 波形的情况，提出了参考当前优化方法。参考电流在两相导通模式和换相模式的优化设计，分别根据反电动势波形。为了获得反电势在真正的时间，它是一个不错的选择，构建观察员。在本文中，全阶观测被为了估计反电动势波形。第二，在减刑，换向控制与两相开关模式或三相开关模式是聘来控制 noncommutated 绕组跟踪优化的参考电流的电流。目前的 noncommutated 绕组和参考电流和实际电流之间差异的变化速度用于确定是否三相逆变器工作在两相开关模式或三相开关模式，避免可能的错误选择控制模式仅通过判断速度在常规控制方法。第三，变结构控制 (VSC) 与宽带噪声抑制能力强、 强 ro 滞后反对外部干扰等优点广泛应用于电机驱动器 [25]，[28] 一【30]。基于 VSC 前面提到的优点，使用积分 VSC(IVSC) 的电流控制器用于实现电流的优化控制的两相导通模式和换向模式。IVSC 的控制律被由连续的等效组件和开关元件;因此，避免了在自然的聊天现象。本文提出的方法可以降低转矩脉动和宽调速范围和全负载范围内可以提高电机的控制性能。本文的其余部分是有组织如下。第二节描述了参考当前优化方法在两相导通模式和换流模式。第三节叙述了减刑方法在高高速模式。第四节是在两相导通模式和基于不同开关调制方法的换向模式中使用 NSC 的电流控制器的设计。第五节是全阶观测估计实时反电势波形的设计。第六节，实验验证了所提出方法的有效性。最后，在第七节给出结论。

結果 (中文) 3:

针对非理想梯形波反电势换向无刷直流驱动，提出了减少转矩脉动的电流优化控制方法。这可能有三个主要的考虑因素。首先，提出的情况下，反电动势是非理想吸附-梯形波形参考电流的优化方法。在两相的导通模式和换向模式的参考电流进行了优化，分别按照反电动势波形。为了实时获得反电动势，构造观测器是一个很好的选择。在本文中，一个状态全阶观测器反电势波形。其次，在换向，换向控制两相开关或三相开关是用于控制noncommutated绕组电流跟踪参考电流的优化。目前的noncommutated曲折变化和基准电流和实际电流之间的差异率来确定三相逆变器在三相开关两相开关或作品，避免了控制模式只有通过判断在常规控制方法速度可能错误的选择。第三、变结构控制（VSC）具有较强的宽带噪声抑制能力和较强的鲁棒性和外部干扰的优点，已被广泛用于电机驱动的[ 25 ]，[ 28 ]一【30 ]。基于滑模变结构的优势，前面提到的，使用积分VSC电流控制器（IVSC）来实现电流优化控制两相导通模式和换流方式。IVSC的控制律是由连续的等效元件和开关元件；因此，在本质上聊天的现象是可以避免的。本文提出的方法可以减少转矩脉动，可以提高电机的控制性能，在很宽的速度范围和宽的负载范围。本文的其余部分组织如下。第二节介绍了双相传导模式和换向模式的参考电流优化方法。第三节介绍了在低和高速模式下的换相方法。第四部分是使用NSC在两相导通模式和基于不同的开关调制方法减刑模式电流控制器的设计。第五节是一个状态观测器实时估计反电动势波形的设计。第六节最后实验验证了所提出方法的有效性，得出的结论是在第七节了。