Improved torque performance in BLDC-motor-drive through Jaya optimization implemented on Xilinx platform

Robust dynamic speed response with less maintenance and efficient operation makes the Brushless Direct Current (BLDC) motors as an oblivious choice for many motoring applications which needs instantaneous speed control while developing high torque. This paper proposes Jaya optimization Algorithm on Xilinx platform for BLDC Motor and Fractional Order Proportional Integral Derivative controller to improve its efficiency through minimizing the ripples present in the Torque of the motor. The control strategy of torque controller works with the combinations of Xilinx and optimization algorithms. In this proposed controller, the strategy of control is achieved after deriving the BLDC motor's dynamic mode there after the electronic interaction with BLDC motor is enrooted with the Math lab/Simulink model while tactically utilizing Xilinx tools for all kind of co-simulation in the same model. Initially the dynamic model of a BLDC motor drive is derived and the control topology is designed with the help of the proposed controller. The controlling mechanism established in this paper is effective and efficient in minimizing the ripples present in the torque of the motor. The proposed controller is utilized for possible low-cost and high-performance industrial applications. The results are obtained and analyzed with existing methodologies and it shows that the proposed technique outperforms the existing models.     

Compensation of torque ripple in high performance BLDC motor drives

Brushless DC motor drives (BLDC) are finding expanded use in high performance applications where torque smoothness is essential. The nature of the square-wave current excitation waveforms in BLDC motor drives permits some important system simplifications compared to sinusoidal permanent magnet AC (PMAC) machines. However, it is the simplicity of the BLDC motor drive that is responsible for causing an additional source of ripple torque commonly known as commutation torque to develop. In this paper, a compensation technique for reducing the commutation torque ripple is proposed. With the experimental results, the proposed method demonstrates the effectiveness for a control system using the BLDC motors that requires high speed and accuracy.     

Commutation Torque Ripple Suppression in Three Phase Brushless DC Motor Using Open-end Winding

Three phase brushless DC motor has the characteristics of high power density, simple structure and excellent speed regulation performance, which is widely used in the field of electric drive. Open-end winding brushless DC motor has no neutral point, and each phase winding is electrically isolated, which can realize the independent control of each phase winding. Compared with Y-connected brushless DC motor, the open-end winding brushless DC motor has a wider range of speed regulation under the same voltage, and has certain fault-tolerant performance, which is suitable for the application of low voltage and large current. Compared with the multiphase fault-tolerant motor, open-end winding brushless DC motor has simpler structure and higher winding utilization rate. However, the open-end winding brushless DC motor still has torque ripple, among which the cogging torque is related to the motor body structure, while commutation torque ripple is affected by the mutual inductance of the winding and the current freewheeling loop. The commutation process of the open-winding brushless DC motor is analyzed, and it is concluded that the current change rates of the turn-off phase and turn-on phase are equal under the ideal back electromotive force(back-EMF), which can ensure that the non-commutation phase current and the electromagnetic torque kept constant. The overlapping commutation with phase current closed-loop method is proposed to suppress the commutation torque ripple of open-end winding BLDC motor, and the applied voltage on turn-off phase and delayed time of turn-off phase in overlapping commutation are derived, the sliding mode observer is used to calculate the electromagnetic torque. MATLAB simulation and experimental results verify the effectiveness of this method.

     

ANFIS based multi-sector space vector PWM scheme for sensorless BLDC motor drive

This paper presents a design and development of Multi Sector Space Vector Pulse Width Modulation scheme (MS-SVPWM) for the speed control of brushless direct current (BLDC) motor drive. This control scheme is developed to enhance the performance of BLDC under wide range of speed and load variation. The hardware prototype is developed for 400 W, 30 V, 3000 rpm BLDC motor. The drive consists of uncontrolled rectifier unit for providing DC source to inverterunit. The proposed drive control has been done by implementing MS-SVPWM scheme using ANFIS control. The main function of ANFIS controller is to select the suitable sector for the drive and also predict the mismatching pulses by comparing conventional SVPWM and MS-SVPWM switching patterns. This new switching control technique helps to reduce switching losses of inverter and also improves an efficiency of BLDC system. This MS-SVPWM reduces the DC voltage ripple; Total Harmonic Distortion (THD) and torque ripple to the standard level. To verify and validate the practicality of the proposed system, the simulation is first performed using MATLAB Simulink tool. The hardware system is developed for the MS-SVPWM using DSPIC30F4011controller, the simulation and experimental results are presented.     

基于动态换向策略的开关磁阻电机控制方法

针对开关磁阻电机(SRM)的自身结构造成的转矩脉动问题以及驱动系统的抗干扰能力,提出了一种基于改进的动态换向策略与改进小波神经网络(WNN)的控制器方案。基于直接瞬时转矩控制(DITC)系统设计了一种动态的换向策略,减少关断以后的相电流,增加开通相电流的被激励程度,进而抑制系统的转矩脉动。此外基于小波神经网络改进了速度控制器,并将系统的输出转矩引入,使得系统能更好地应对扰动,增强系统的鲁棒性。仿真结果表明,与传统直接瞬时转矩控制和基于小波神经网络的转矩控制相比,转矩脉动减少了22.12％到64.14％,负载突变后静态误差仅为0.02r/min到0.01r/min,可以有效减弱转矩脉动且系统的抗扰能力显著提高。     

无刷直流电机换相转矩脉动抑制的研究

针对无刷直流电机换相时产生的转矩脉动,采用自抗扰控制技术设计出一种自抗扰控制器来消除转速响应的超调,同时通过自身的扩张状态观测器检测系统的相电流脉动和自身的非线性状态反馈控制律对检测到的电流脉动误差值进行补偿抵消,以达到抑制相电流脉动的效果,从而抑制电机的转矩脉动.仿真结果表明,自抗扰控制比PI控制能更好地抑制转矩脉动,提高电机转速的稳定性和系统的可靠性.     

无刷直流电机转矩脉动抑制研究

在电力电子技术发展的研究中,无刷直流电机系统具有转矩电流比高、转速高、动态性能好、可靠和易于控制等优点,在中小功率驱动场合应用广泛;但缺点是换相转矩脉动大,一定程度上制约了无刷直流电机的应用。为提高电机精度和稳定性,针对无刷直流电机换相转矩脉动的问题,采用补偿方法,分析了HPWM-LON调制方式对无刷直流电机换相转矩脉动的影响,提出了一种直接面向转矩脉动的补偿方法,建立了Psp ice仿真模型,通过对仿真结果的分析和比较,得出了这种转矩脉动补偿方法能有效的抑制转距的脉动,提高性能精度,消除了转矩脉动产生的噪音。     

DSP-based control of brushless DC drives for direct-driven robotic arms

Modern permanent magnet brushless DC (BLDC) drives have excellent high-torque capabilities which make them suitable for direct-drive applications in robotic arms, but unfortunately they suffer from torque pulsations when controlled by a conventional current controller. The technique of instantaneous torque control with indirect torque sensing is aimed at reducing such torque pulsations. The AT&T DSP32, a digital signal processing chip, is used as the controller since the control algorithm requires high-speed computations. The DSP circuit has been constructed on a prototyping card and mounted in a microcomputer which serves as the program development system as well as run-time input-output controller. We present the design, implementation and experimental results of the proposed DSP-based instantaneous torque controller.     

The use of field programmable gate array （FPGA） in direct torque control of induction motor

In this paper, the feasibility of embedding the direct torque control （DTC） of an induction machine into field programmable gate arrays （FPGA） is investigated. DTC of an induction machine is simulated in a MATLAB/Simulink environment using a Xilinx system generator. The resulting design has a flexible and modular structure where the designer can customize the hardware blocks by changing the number of inputs, outputs, and algorithm when it is compared to the designs implemented using classical microcontrollers and digital signal processors. With its flexibility, other control algorithms can easily be programmed and embedded into the FPGA. The above system has been implemented on Xilinx Spartan 3A DSP FPGA controller. Simulation and experimentation have been performed to prove the validity of the proposed methodology.     

基于转矩分配函数的开关磁阻电机的效率优化方法

开关磁阻电机使用传统的转矩分配函数(TSF)控制时虽然可以起到一定的抑制转矩脉动的作用,但却由于换相阶段电流峰值过高,电流可控性下降等问题使得其在换相阶段出现较为明显的转矩脉动,以及较高的铜耗。针对这一问题,提出了一种基于TSF的开关磁阻电机的效率优化方法。将电机特性作为约束条件,以铜耗为优化目标建立最优化模型,利用多重嵌套的遗传算法将该最优化模型应用于Simulink仿真中,得到不同参数下最优的电流参考曲线。再根据不同转速下对电机性能的需求,进一步筛选权重参数,从而得到最优的电流参考曲线。仿真和实验结果表明,该方法能够有效地降低换相阶段的电流峰值、降低电流控制难度,进而在较低转速下抑制转矩脉动、在较高转速下提高效率。     

基于转矩分配的开关磁阻电机模糊PI控制系统

针对开关磁阻电动机调速系统显著非线性造成固定参数在常规控制下不能很好适应工况变化以及转矩脉动比较大的问题,设计了基于转矩分配的模糊PI控制器来实现参数在线优化调整,提高系统动态响应,并抑制转矩脉动。仿真结果表明,该系统具有良好的动、静态性能,能有效减小转矩脉动。     

基于脉冲注入的无位置传感器SRM转矩优化研究

位置传感器的引入,使得开关磁阻电机(SRM)结构复杂,可靠性降低,研究了非导通相注入脉冲的转子位置估计方法,该方法不受电机控制方式,以及绕组电流超越饱和阈值的影响.针对响应脉冲电流产生的扰动转矩,设计了基于脉冲注入法的开关磁阻电机转矩优化系统.通过转速环将转矩差转换为给定转矩,建立合理的转矩分配机制,得到给定相转矩,并将直接瞬时转矩控制(DITC)与电流闭环控制相结合使转矩准确吻合给定相转矩,从而实现电机的循环控制,有效减小了脉冲电流产生干扰转矩对转矩波动的影响.建模仿真验证了方法的可行性:对基于脉冲注入的无位置传感器开关磁阻电机的转矩脉动具有良好的抑制效果.     

无位置传感器的BLDC控制设计与调制优化

基于无位置传感器控制设计了一种可应用于三相直流无刷电机的驱动控制器,采用反电动势法检测转子位置,梯形波驱动控制方式实现BLDC电机的启转 、运行.介绍了BLDC运行原理及实现无位置传感控制方法,探讨了如何选择最佳调制方式及电机速度最快时的换相时机,并优化了调制方法.本文设计的控制器具有启转顺 、加速快 、防输出短路等特点,适用于多种高低速 、高低电压BLDC.     

基于DSP/BIOS的无刷直流电机控制系统的研制

无刷直流电机继承了直流电机运行效率高、调速性能好等优点,同时,克服了直流电机电刷带来的噪声、火花等缺点,在诸多领域得到广泛应用.为改善无刷直流电机控制系统的性能,本文研究模糊自适应PI控制器在无刷直流电机控制系统的应用.系统以TMS320F2812数字信号处理器为控制器设计了控制系统硬件,基于DSP/B10S嵌入式操作...     

A study on the improvement of the cam phase control performance of an electric continuous variable valve timing system using a cycloid reducer and BLDC motor

This paper discusses the control performance improvement for an electric-continuous variable valve timing (E-CVVT) system using a brushless direct current (BLDC) motor and cycloid reducer. Each component of the E-CVVT system was implemented with mathematical analysis, and the response performance of the E-CVVT system was determined based on the mathematical model of the cam shaft motion, cam profile, cycloid reducer, BLDC motor, and controller. To control the intake valve timing of the engine, a cycloid speed reducer with a high reduction ratio capable of amplifying the output torque of a small BLDC motor was implemented. The change in valve speed due to the rotation of the cam shaft was represented by the curves described by the vertical movement of the valve using the cam profile. A control performance test apparatus was constructed and the torque of the intake cam shaft was measured and applied to the analysis so that the phase of the cam shaft could be changed using the E-CVVT system. To analyze the operating characteristics of the E-CVVT system, the BLDC motors were modeled using Simulink. The E-CVVT system controls the phase angle of the intake cam shaft. When the E-CVVT system sets the target phase angle, the motor controller generates the optimal motor speed command. The intake cam phase response speed depends on the setting of each PID parameter that changes the phase of the cam shaft. Through analysis and vehicle-based experiments, we confirmed the improvement of the E-CVVT system response performance according to the change of the PID parameter.

     

PI velocity control of brushless DC motors using the extended dq transformation

This paper is concerned with velocity control in brushless direct current (BLDC) motors. Our control scheme is composed of a classical proportional–integral velocity controller and a proportional electric current controller computed in the extended dq coordinate system. We employ a finite time estimator that has been previously proposed in the literature intended to estimate the unknown back electromotive forces. This estimator has been proven previously to converge locally to the true values. This control strategy is proposed to eliminate torque ripple produced by the fact that back electromotive forces in BLDC motors are nonsinusoidal. We present, for the first time, a formal stability result for this control scheme: (a) the state has an ultimate bound provided that the estimate of the back electromotive forces is close to the true values, and (b) this ultimate bound can be rendered arbitrarily small when the estimate of the back electromotive forces converges to the true values. This result stands when starting from any initial condition such that the finite time estimator is ensured to converge to the true values. We verify our findings through simulations.     

模糊滑模控制和负载转矩补偿的异步电动机直接转矩控制

针对异步电动机(IM)转矩脉动以及抗干扰能力差的问题,设计了基于模糊滑模控制(FSMC)与负载转矩补偿的新型直接转矩控制(DTC),取代传统PID速度调节器的是一种滑模控制器.为解决滑模控制器中负载转矩脉动的问题,用模糊逻辑控制器取代了传统滑模控制律中的不连续部分,可以明显降低异步电动机在低速运转时的转矩脉动.提出了一种负载转矩观测器来估计未知的负载转矩.负载转矩观测器用来估计负载转矩扰动,估计作为速度环的前馈补偿.仿真结果表明:在低速负载转矩扰动时,该设计具有更好的动态响应和速度性能、更高鲁棒性和更强的抗干扰能力.     

A new robust speed-sensorless control strategy for high-performance brushless DC motor drives with reduced torque ripple

This paper presents an analysis, design, and strategy of a high-performance speed-sensorless control scheme for estimating the phase-to-phase trapezoidal back-EMF of BLDC motor drive by means of a novel stochastic deconvolution technique in the H_∞ setting, named robust stochastic H_∞ deconvolution filter. In the proposed method, unlike the conventional observer-based approaches, the back-EMF is considered as an unknown input, and no need is felt for the constancy assumption of the rotor position and speed of machine within a short period of the time in the modeling of the BLDC motor which leads to ignoring the back-EMF dynamic at high and variable speed. In addition, since high-speed operation is vital for the motor, an improved approach has also been proposed to reduce the commutation-torque-ripple at high-speed for direct torque control (DTC) strategy of three-phase BLDC motor with 120° conduction mode in parallel with the proposed method due to the fact that drive performance intensely downgrades in this mode.     

飞艇隔振云台电机控制器设计与实现

飞艇隔振云台的主要执行机构是三相无刷直流电机,电机控制的精度决定了隔振云台系统的隔振效果。传统的云台电机控制器设计方法是根据控制规律通过反复试凑,得到PID控制器参数,这种方法费时费力,需要一定的调参经验。针对云台调参问题,对无刷直流电机进行了理论分析与模型建立,并提供一种与传统方法不同的利用特定工具和技术手段获取模型参数的方法,通过Matlab中rltool根轨迹零极点配置工具设计出合理的控制器,使得电机具有良好的动态响应和稳态响应。并且在此基础之上将控制器实际运用到云台平台上,实验取得良好的控制效果,为隔振云台中三相无刷直流电机控制器设计与调参方案提供参考。     

直流无刷电机的DSP模糊控制系统

基于DSP设计了直流无刷电机的模糊控制系统,阐述了系统硬件主电路设计,以及软件实现的设计方法,为解决直流无刷电机控制中难题,进一步提高系统控制性能,采用了无刷直流电机电流、转速双闭环控制及模糊自整定PI算法的控制策略,较好实现了直流无刷电机控制系统的智能控制。应用了PWM控制的重叠换相法抑制转矩脉动。实验结果及仿真结果表明,该系统控制效果良好,转矩脉动抑制明显,运行可靠的特点,验证了该设计的快速稳定和鲁棒性。