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所叙述的无刷直流伺服电动机包括两个基本部份:1)由永磁转子和作为转子位置传感器的霍尔效应装置所组成的无刷直流电动机和2)电子控制箱。该控制箱的一个重要特点是有非线性的运算放大器电路,使控制输入死区被消除,并且提供一个由定子绕组的反电势得到的负反馈控制信号。结果是装置的力矩与速度特性非常接近理想的伺服电动机:即均匀距离的负斜率的直线簇。 相似文献
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数字化伺服放大器MAXON精密电动机公司开发的 DES70 / 1 0为数字化伺服放大器 ,设计用于无刷电动机的速度和转矩控制。 5 0 Hz下的正弦波整流 ,用以确保即使在低转速时平稳的速度与转矩控制。 4象限的伺服放大器表示 ,无论加速度还是制动时 ,均可顺时钟或逆时钟方向控制转速。设计上是针对装有霍耳( Hall)效应传感器和数字式编码器的无刷电动机。DES70 / 1 0还备有与低电感电动机能兼容的元件——扼流模块。该伺服放大器重 41 0 g,外形尺寸为1 80 mm× 2 6mm× 1 0 3mm。(摘译自《Mechamical Engineering》2 0 0 3,No.4)光电旋转编码… 相似文献
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基于自适应转速辨识的直接转矩控制系统研究 总被引:1,自引:0,他引:1
介绍了一种基于模型参考自适应系统(Model Reference Adaptive System,简称MRAS)的感应电动机无速度传感器直接转矩控制(direct torque control,简称DTC)方案.该方案中,根据Popov超稳定性理论得出了电动机转子转速的估算方法,给出了感应电动机无速度传感器DTC系统的结构,完成了以16位嵌入式微控制器dsPIC30F6010和智能功率模块为核心的控制系统设计.实验结果表明,该方案能准确观测电动机定子磁链,可以对电动机的转速进行有效的辨识. 相似文献
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基于DSP的无刷直流电动机控制系统 总被引:9,自引:0,他引:9
设计一种基于数字信号处理器DSP的无刷直流电动机控制系统。充分利用TMS320C240DSP外设接口丰富、运算速度快的特点 ,采用PWM方式 ,以霍尔传感器作为位置和速度传感器 ,实现对无刷直流电动机的位置与速度控制。 相似文献
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随着我国海上风电的迅猛发展,感应电机作为一种主流电机已广泛用作海上风电中的发电机组。针对感应电机无速度传感器控制中转速估算误差大、过渡不平滑及反馈矩阵的计算量大等问题,设计了一种基于简化型反馈矩阵的新型全阶观测器方案。设计时先按照极点平移法推导出反馈矩阵中各元素的表达式,再从稳定性与收敛速度两方面综合考虑,提出一种反馈矩阵的简化思想,以减小计算量及实现难度。通过对方案进行仿真与实验,结果表明该新型全阶观测器在感应电机的无速度传感器控制过程中观测精度高,动态性能好,工程实用性强。 相似文献
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Pulse generators (PGs) are equipped to detect the rotor frequency of induction traction motors for torque control in railway vehicle traction field. Eliminating PGs is preferable from the viewpoints of increasing the reliability of the traction system, reduction of both the initial and maintenance cost, and downsizing induction traction motors. Expecting those advantages, we have been studying the application of a sensorless control method to induction traction motor control. Prior to some reports of studies and tests to apply speed sensorless strategy to railway vehicle traction we launched ideas to apply the speed sensorless control strategy and results of the studies and tests. In this paper, we present the novel control method for railway vehicle traction and some results of theoretical study and tests. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 161(2): 69–77, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20273 相似文献
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扩展卡尔曼滤波器(extended Kalman fileter,EKF)已广泛应用于无速度传感器矢量控制转速估计。尽管扩展卡尔曼滤波器具有较强的抗干扰能力,但是面对粗差时仍然会出现较大的抖动,影响系统的控制性能。提出了一种基于抗差扩展卡尔曼滤波器的转速估计方法,分析了粗差对扩展卡尔曼滤波器估算精度的影响,探讨了在应用于感应电机转速估计时抗差EKF能否同样取得良好的估计精度,以及优于EKF的抗粗差性能。通过仿真与实验,对比了遇到较大外部干扰和估算误差干扰时抗差EKF与EKF的转速误差和磁链变化。仿真与实验结果表明,抗差EKF较EKF而言具有更好的抗粗差性能,可以使系统遇到干扰时更快收敛。 相似文献
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异步电机参数离线辨识改进算法 总被引:2,自引:0,他引:2
为实现变频调速系统的自运行(self-commissioning),提出了一种异步电机参数离线辨识的改进算法,该算法能直接辨识出与无速度传感器定子磁场定向矢量控制相关的大部分电机参数。利用直流实验辨识定子电阻,并通过分析逆变器的开关状态,得到直流实验的等效控制电路。采用单相交流堵转实验辨识定子总漏感和转子电阻,并通过分析异步电机相量图得到单相交流堵转实验稳定运行的工作条件。恒压频比空载实验辨识定子自感,对电机定子频率进行补偿以消除可能出现的定子电流振荡。利用直流侧电压和PWM占空比来重构定子电压,并根据电机电流极性补偿逆变器死区引起的电压误差。最后,在两台不同功率等级的异步电机上进行了参数辨识和无速度传感器定子磁场定向控制的实验研究。实验结果表明,参数辨识结果对直流侧电压不敏感,辨识得到的电机参数能满足无速度传感器矢量控制系统对电机参数准确性的要求。 相似文献
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Sensorless Vector Control of Induction Motors Using Minimum Dimensional Flux D‐State Observer with Instantaneous Speed Estimation 下载免费PDF全文
SHINJI SHINNAKA 《Electrical Engineering in Japan》2016,196(1):31-41
This paper proposes a new sensorless vector control method for induction motors using a minimum dimensional flux D‐state observer with instantaneous speed estimation. First, the D‐state observer with a new design rule of constant observer gains is established in a different way. Second, a new speed estimator using flux estimates produced by the observer is established on the basis of the fundamental relationship between the rotor flux and the slip frequency. Speed estimates are reused in the observer as feedback. Characteristic analyses and the usefulness of the proposed vector control method are verified by simulations. 相似文献
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《Electric Power Systems Research》2007,77(5-6):619-629
Sensorless control is considered to be a lower cost alternative than the position or speed encoder-based control of induction motors. Two popular sensorless control methods, namely, the model reference adaptive system (MRAS) and the Luenberger observer (LO) methods are compared for speed and torque control characteristics. They are also compared against the well-known vector control principle. For the drive system simulated, the torque and speed obtained from sensorless control are almost identical to those obtained from the vector control method. However, the torque ripple for the sensorless methods is observed to be higher than vector control-based method. The MRAS method introduces higher torque ripple when compared to the Luenberger observer. In addition, speed estimation methods employed in sensorless control are more sensitive to motor parameter variations. 相似文献
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Vector control systems of induction motors without speed sensors have been earnestly developed to obtain a simple construction. To estimate the rotor speed, these systems require information of machine parameters such as secondary resistance. Therefore their performance is sensitive to variations of secondary winding temperature. The authors propose two useful calculation methods for a speed sensorless system. The first is a rotor speed calculation method by which the exact speed can be computed directly. The method does not require information of the secondary resistance, which makes it free from variations of secondary resistance. The second is a direct secondary resistance calculation method. It can be applied to compensation in speed sensorless vector control for exact speed estimation of secondary resistance. The effectiveness of the proposed methods are verified by digital simulation and experimental results. In this article, the influence of the machine and control circuit parameters are also examined 相似文献