Improved Sensorless Operation of Interior PM BLAC Motor Drives with Reduced-Order EKF

It is a challenge to realise an EKF-based sensorless controller for an Interior Permanent Magnet （IPM） brushless ac motor drive due to the influence of nomlinearities and rotor saliency. An improved reduced-order EKF method is presented, reducing the rotor position estimation error of an IPM motor, as evident in [1] due to the neglect of saliency. The effectiveness of the proposed method is verified experimentally.

A Review of Nonlinear Kalman Filter Appling to Sensorless Control for AC Motor Drives

Sensorless control of AC motor drives,which takes the advantages of cost saving,higher reliability,and less hardware,has been developed for several decades.Among the existing speed sensorless control methods,nonlinear Kalman filter-based one has attached widespread attention due to its superb estimation accuracy and inherent resistibility to noise.However,the determination of noise covariance matrix and robustness of model uncertainties are still open issues in practice.A great number of studies try to solve these problems in resent years.This paper reviews the application of extended Kalman filter(EKF),unscented Kalman filter(UKF),and cubature Kalman filter(CKF)in speed sensorless control for AC motor drives.As an iterative algorithm,EKF has advantages in processor implementation.However,EKF suffers from the linearization error and model uncertainties when applying to sensorless control system.This paper presents the predominant improvements of EKF which is also applicative in UKF and CKF mostly.

A Review of Sensorless Control Methods for AC Motor Drives

In recent years,the application of sensorless AC motor drives is expanding in areas ranging from industrial applications to household electrical appliances.As is well known,the advantages of sensorless motor drives include lower cost,increased reliability,reduced hardware complexity,better noise immunity,and less maintenance requirements.With the development of modern industrial automation,more advanced sensorless control strategies are needed to meet the requirements of applications.For sensorless motor drives at low-and zero-speed operation,inverter nonlinearities and motor parameter variation have significant impact on the stability of control system.Meanwhile,high observer’s bandwidth is required in high-speed region.This paper introduces the state of art of recent progress in sensorless AC motor drives.In addition,this paper presents the sensorless control strategies we investigated for practical industrial and household applications.Both advanced sensorless drives of induction motor(IM)and permanent magnet synchronous motor(PMSM)are presented in this paper.

Six-step Voltage Control of PM Brushless AC Motors under High Speed Flux-weakening Operation for EV/HEV Applications

The torque-speed characteristics of brushless motor having an interior permanent magnet rotor and a sinusoidal back-emf waveform are compared experimentally when it is operated in brushless AC(BLAC) mode and brushless DC (BLDC) modes with both 2-phase,120° conduction(BLDC-120) and 3-phase,180° conduction(BLDC-180).Particular emphasis is on high-speed,six-step voltage controlled,flux-weakening operation.It is shown that for EV/HEV applications,even for interior PM brushless motors which have sinusoidal back-emf waveforms,in order to achieve maximum torque per ampere capability over wide operation speed range,it is advantageous to employ a hybrid operation mode-BLAC operation in the constant torque region and six-step voltage control(BLDC-180 operation,together with current phase control) in the flux-weakening region.

EFFECTS OF DYNORPHIN A （1－17） ON MOTOR FUNCTION AND SPINAL INTRACELLULAR MESSENGER SYSTEMS IN RAT

The effect of intrathecal injection of dynorphin A (1-17) on second messenger systems of spinal cord relative to behavioral change in rats was studied. Dynorphin A (1-17) 5 ,10 (20nmol) caused dose-dependent flaccid paralysis of hindlimbs. Dynorphin A (1-17) 10, 20 nmol dose-dependently decreased spinal adenylate cyclase (AC) activity, cyclic AMP production, calmodulin (CaM) level and cyclic-nucleotide phosphodiesterase(PDE)activity 10 min after intrathecal injection. They recovered to a varying extent two hours later. Pretreatment with selective κ-opioid receptor antagonist nor-BNI 30 nmol 10 min before dynorphin A (1-17) markedly antagonized the effects of dynorphin A (1-17 ) at 20 nmol on hindlimb paralysis and inhibition of intracellular second messengers. The L-type calcium channel blocker verapamil (100nmol) also played a role in blocking dynorphin neurotoxicity. The NMDA receptor antagonist APV could partially or completely block dynorphin inhibition of CaM level and PDE activity without affecting paralysis and decrease of AC-cAMP level induced by dynorphin A(1-17) 10 min after intrathecal injection.

CONVEX CONTROLLER DESIGN APPLIED TO AC INDUCTION MOTOR TO SATISFY MULTIPLE SIMULTANEOUS SPECIFICATIONS

The application of a closed-loop specification oriented feedback control design method, which addresses the design of controllers to satisfy multiple simultaneous conflicting closed-loop performance specifications is presented. The proposed approach is well suited to the design of controllers which must meet a set of conflicting performance specifications. Gain tuning is central to the design process, however, the tuning process is greatly simplified over that presented by the problem of tuning a PID controller for example. The proposed control method is applied to an AC induction motor, with an inner-loop flux vector controller applied to design a position control system. Experimental results verify the effectiveness of this method.

HC-55 Single-Phase AC Series-Excitation Commutator Motor

The HC-55 single-phase AC series-excitation commutator motor exported to Japan by the Linquan Motor Factory is an open-type motor characterized by simple structure, small volume, high rotary speed, large starting torque, reliable operation and easy installation. It can be used as a driving component for various kinds of household electrical appliances, such as electric mills, pulverlizers, small stirrers, vacuum cleaners and electric hair dryers, an ideal product for electrical equipment.

Power Factor Improvement of AC-DC Converter Based on Separately Excited DC Motor Using Passive Filter

In industries DC motor drives are very essential due to their high performance applications such as its reliability, ease of control, low cost and simplicity. And speed control of these motors is very easy due to power electronic AC-DC converters. These power electronic converters are with prominent low power factor and higher Total Harmonic Distortion (THD). These converters operate only for short time resulting non-sinusoidal waveform. This problem of harmonic distortion can be mitigated by reshaping the non-sinusoidal waveform to pure sine wave. Different wave shaping techniques have been developed by using different filters among which one is tuned passive filter. This paper proposed power factor improvement and harmonic mitigation of AC-DC converters based on separately excited DC motor using tuned passive filter. In this context experimental model is designed and results are analyzed by power quality analyzer.

ACE-Star循证护理模型在甲状腺癌患者术后康复护理中的应用效果

目的探讨ACE-Star循证护理模型在甲状腺癌患者术后康复护理中的应用效果。方法采用简单随机抽样法选择2021年1月至2023年4月安徽省阜阳市肿瘤医院收治的100例甲状腺癌患者作为研究对象,采用随机数字表法将其分为对照组和观察组,各50例。对照组实施常规护理模式,观察组实施ACE-Star循证护理模型,观察比较两组术后次日、术后12周的颈部运动度情况。结果术后12周,两组颈部运动度均高于术后次日,且观察组高于对照组(P<0.05)。结论ACE-Star循证护理模型能加快改善甲状腺癌患者术后的颈部运动功能,对改善预后有重要意义。

采用AC0.69k V为市域线远距离低压电动机配电的应用研究

分析了市域线区间内电动机负荷采用AC 0.69 kV(660 V)供电的可行性与经济性。AC 0.69 k V(660 V)为规范规定的标准电压,低压相关元器件均可在0.69 kV系统中正常运行,其实际运用案例在我国工业领域已数不胜数。研究表明,AC 0.69 kV应用于市域线电动机配电领域是可行的;可选择合适的负荷,由AC 0.69 kV供电,其他负荷的配电方案可按常规的AC 0.4 kV方式供电,2种方案可并行;各市域线项目应根据工程投资估算确定远距离电机配电方案。当负荷的距离及容量合理时,AC 0.69 kV可显著减少工程的总投资。

基于PMAC的交流伺服CO_2脉动送丝系统的研究

采用PMAC2-PC104运动控制卡对转动惯量低、响应速度快的交流伺服电机进行控制,研制了实时控制CO2焊脉动送丝系统。设计了信号隔离接口电路,将焊接过程的各种信号实时传递给运动控制系统。根据CO2焊接工艺参数规划了焊丝的运动参数。通过对PMAC运动控制卡PID参数和其他运动参数的配置,以PLC程序和运动程序组合的方式实现了由短路/燃弧信号触发的实时控制的脉动送丝短路过渡CO2焊接过程。系统送丝稳定,最高脉动送丝频率可达90Hz。

基于dSPACE的三相交流异步电机SVPWM实验设计

dSPACE实时仿真系统是一套基于Matlab/Simulink的控制系统开发及测试的工作平台,实现了与Matlab/Simulink的完全无缝连接。结合dSPACE仿真系统在电机控制系统实验教学中的应用,介绍了基于dSPACE的三相交流异步电机SVPWM实验的设计。完成了交流异步电机矢量控制系统的离线仿真、SVP-WM模块的搭建以及基于dSPACE仿真系统的在线测试,实现了SVPWM的正确输出,为交流电机的控制实验打下基础。

ACTS2000异步牵引电动机试验系统

介绍了 ACTS2 0 0 0异步牵引电动机试验系统的试验能力以及电源系统、负载系统、测量与控制系统等部分的主要内容。同时介绍了测控系统的软件结构 。

组合式Halbach阵列磁场分布特性研究

介绍了Halbach阵列原理和组合式Halbach阵列的自屏蔽效应,并讨论了组合式Halbach阵列的气隙磁密与磁钢厚度的关系,同时还对环形组合式Halbach阵列与表贴式永磁电机的气隙磁密基波进行了对比研究,揭示组合式Halbach阵列的磁场分布特点和在直线电机和旋转电机中的设计规律。实验结果很好地验证了所讨论模型的正确性。研究对永磁伺服电机设计和研究具有工程意义。

AC斩波器—Semihex^(TM)接法单相电动机调速系统仿真研究

着重研究了AC斩波调压器在SemihexTM接法单相电动机中的应用,建立了AC斩波器—SemihexTM接法单相电动机调速系统的瞬态数学模型,对单相buck型对称PWM交流斩波调压器供电的SemihexTM接法单相电动机的瞬态特性进行了仿真计算,仿真结果与理论分析相符。对正弦波电源供电和AC斩波调压器供电的仿真结果进行了比较分析,所做的工作对AC斩波调压器—三绕组单相电容电动机调速系统设计有一定的工程实际意义和参考价值。

基于PMAC下SCARA机器人控制

介绍如何实现 PMAC LITE四轴运动控制器对 SCARA机器人的控制 ,具体阐述了基于PMAC下 ,交流伺服电机的调整以及 SCARA机器人轨迹的生成。

基于RVACD和WPE感应电机转子断条故障诊断

针对感应电机转子断条故障诊断存在故障信号复杂多变、诊断时受负载和电源波动影响较大等诸多不足之处,提出断电残压(Residual Voltage after AC dump,RVACD)和小波包熵(Wavelet Packet Entropy,WPE)的故障诊断方法。以电机断电后残余电压为研究对象,建立转子断条故障的断电残压模型;分析断电残压信号频谱,得到故障特征频率;结合小波包和信息熵理论得到小波包Shannon熵,计算并与正常电机熵值作对比,得到故障诊断依据。仿真结果表明,断电残余电压可有效避免外界因素的干扰,断电残压频谱简单明了,小波包熵值作为故障诊断依据简单可靠,为工程实际提供了新的思路。

ACS6000交流传动系统在铝冷轧机主传动中的应用

介绍ABB中压传动系统ACS6000在铝冷轧主传动中的应用,主要描述ACS6000中压变频器在铝冷轧机应用中的系统构成和控制原理。

基于智能型AC-SSR的三相交流电机正反转控制及应用

在铁制网状纸篓成型的生产过程中,要求控制三相交流电动机正反转,采用交流接触器组成的控制电路,因其正反转频繁而造成交流接触器的触点很快损坏。使用交流固态继电器组成的控制电路,切换速度快,使用寿命长。尤其是采用智能型三相交流电动机正反转固态继电器组成的控制电路,接线简单,实际运行稳定可靠。

基于PMAC的交流伺服电机S曲线加减速控制方法研究

介绍应用于交流伺服电机的S曲线加减速速度控制方法,并着重探究PMAC控制器内部S曲线加减速功能的算法。利用永磁交流伺服电机执行PMAC的S曲线加减速运动程序,其速度曲线表明,基于S曲线的交流伺服电机加速度和速度控制方法能使系统拥有良好的稳定性、快速性等动态性能。