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一种电动自行车用无位置传感器无刷直流电机转子位置检测方法 总被引:3,自引:2,他引:1
本文提出了一种用于电动自行车的无位置传感器无刷直流电机转子位置信号的检测方法.本文所有测量电压的参考电位为电源的负母线.高速下通过比较电机的交流虚拟中点与直流虚拟中点,得到反电势的过零点;低速下将电机的交流虚拟中点电压与负母线电位进行比较,得到反电势的过零点.再将反电势的过零点延迟30°电角度即可获得无刷直流电机绕组换相所需要的转子位置信号.该方法具有扩展速度范围的优点.由于不必对检测信号进行滤波,不但省去了滤波电路,同时消除了滤波电路带来的相移问题.文中对该检测方法的原理进行了详细介绍,并通过实验验证了该方法的有效性. 相似文献
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This paper addresses the possibility of integration of an induction machine rotor fault monitoring technique into batch tests. Conventional monitoring techniques are designed for operating conditions near nominal speed and load. Generally, load torque is not available at batch test as the test sample should not or cannot be clutched. However, at standstill, shaft torque and rotor currents are big enough to enable rotor monitoring. Therefore, short-circuit tests are applicable for diagnostic purposes. This application is demonstrated by means of the Vienna Monitoring Method, which is a model-based torque evaluation technique 相似文献
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针对在永磁同步电机(PMSM)中安装传感器带的高成本、体积增大、可靠性降低、易受环境干扰等缺陷,提出了一种基于模型参考自适应理论(MRAS)的转速和转子位置的估算方法.以PMSM本体作为参考模型,电机的定子电流作为可调模型,以超稳定性与正性动态系统理论(Popov)为基础,设计了自适应律PI调节器参数,达到了可调模型稳定追踪参考模型的目的,实现了无速度传感器的转速和转子位置的准确估计.仿真结果表明,所提出的电机无位置传感器的控制方法能在转速突变、负载转矩扰动的情况下,快速、准确估算转速和转子位置,具有较强的动静态性能和鲁棒性. 相似文献
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针对配电网故障的基于模型诊断方法在发生多重多相故障时存在诊断速度慢、诊断准确率不高、容错能力低的情况,提出一种适用于配电网故障的基于模型分层诊断方法。在诊断算法上,利用新的适应度函数和特征学习搜索策略来提高诊断速度和诊断准确率。在诊断模型上,利用分层的方法,将单层单次高维度运算转变为2层多次低维度运算,进而再次提高诊断速度、诊断准确率;通过定义等效部件的约束关系式提高第1层诊断的容错能力,利用电压约束和电流约束的冗余关系提高第2层诊断的容错能力。算例表明,与其他模型相比,基于模型分层诊断方法的诊断速度有了较大的提高,诊断准确率始终维持在理想值附近,容错能力明显增强;在大规模配电网故障诊断中,其优势明显。 相似文献
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线反电动势检测无刷直流电机转子位置方法 总被引:4,自引:1,他引:4
利用传统的反电动势过零检测原理,提出一种利用简化的线反电动势过零检测无刷直流电机转子位置方法,该方法通过实时测量无刷直流电机的任意两路线电压和两路相电流信号,并利用定子电阻参数进行实时简化计算,就可以得到三路线反电动势的过零时刻,从而实现无刷直流电机的无位置传感器控制.该方法结构简单、计算方便,不需要构造电机中点,也不需要进行相位延迟补偿,定子电阻变化对转子位置辨识的精确度影响较小.仿真和实验结果表明,提出的改进线反电动势过零检测方法可以在较宽的速度范围内对转子位置进行准确检测. 相似文献
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为实现永磁同步电机(permanent magnet synchronous motor,PMSM)的平稳起动,同时保证电机工作过程中的转子位置检测精度,提出一种PMSM转子位置复合检测和编码器校正方法。在分析正余弦型复合编码器绝对和增量两种工作模式的基础上,首先给出PMSM转子位置的复合检测方法,导出编码器的单向校正方法,并分析其校正误差。根据编码器单向校正误差的对称性,提出编码器的正、反转双向校正方法。结果表明,编码器参考零点标记信号位置校正值与实际相吻合,提出的方法可以保证电机的平稳起动和转子位置检测的精度,并且提出的校正方法同时适用于电机空载和带载的情况。 相似文献
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内置式永磁同步电机转子初始位置估计方法 总被引:1,自引:0,他引:1
针对现有内置式永磁同步电机(IPMSM)转子初始位置估计方法设计复杂与计算量大的问题,提出了基于旋转高频信号注入和傅氏算法的改进方法。使用移相和傅氏算法从响应电流中提取转子位置初步估算值,利用磁路饱和特性获得转子磁极方向,综合其结果得到转子初始位置,并对死区效应等非线性因素对该方法的影响进行了分析。在此基础上提出使用移位代替移相滤波器(通过选择适当的PMW频率和注入信号频率)、平均滤波等方法改进算法实现。在实验平台上完成验证实验,实验结果表明本文提出的方法能够快速且准确地估算出IPMSM转子初始位置(误差小于6°电角度),并且该方法相比传统方法更容易实施、计算量更小,适合工程应用。 相似文献
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永磁同步电机(PMSM)转子初始位置的准确预测,对电机启动过程的控制有着重要的影响,而在无传感器下精准辨识转子初始位置对电机控制有着诸多好处。提出了一种基于脉冲电压矢量法的高精度永磁同步电机初始位置预测方法。该方法在分析了永磁同步电机转子位置对磁路饱和程度影响的基础上,通过在电机任意两相中加入正反向脉冲电压,测量无电流相的感应电压,获得感应电压幅值与转子位置的关系。利用测试数据训练神经网络来拟合这种关系,构成转子初始位置估算装置。通过仿真实验表明,这种方法可以克服采用电机集中参数模型所带来的各种误差,具有极高的预测准确性。 相似文献
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Riley C.M. Lin B.K. Habetler T.G. Schoen R.R. 《Industry Applications, IEEE Transactions on》1998,34(6):1240-1245
This paper proposes a method for the sensorless online vibration monitoring of induction machines based on the relationship between the current harmonics in the machine and their related vibration harmonics. Initially, the vibration monitoring system records two baseline measurements of current and vibration with the machine operating under normal conditions. The baseline data is then evaluated to determine the critical frequencies to monitor online. Once these frequencies are determined, the baseline vibration measurement is simply used to scale the current harmonic signal to an estimated vibration level. Based on theoretical analysis, simulation results and the experimental results shown here, a linear relationship between the current harmonics and vibration level can be assumed. The results of two experiments on a three-phase 230 V 10 hp induction motor operating under no load are discussed and show the feasibility of this method for sensorless online vibration monitoring 相似文献
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Nondahl T.A. Ray C. Schmidt P.B. Gasperi M.L. 《Industry Applications, IEEE Transactions on》1999,35(4):819-824
Sensorless detection of rotor angular position is desirable for decreasing the cost and increasing the reliability of permanent magnet AC motor drive systems. This paper describes tests performed on a rotor that has surface-mounted magnets and a conducting winding that links only the d axis of the rotor. The rotor winding increases the variation of the stator winding inductance that occurs as the rotor rotates and improves the accuracy of rotor angular position estimates 相似文献
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Tursini M. Petrella R. Parasiliti F. 《Industry Applications, IEEE Transactions on》2003,39(6):1630-1640
This paper presents a method to detect the rotor position of permanent-magnet motors at standstill, which is suitable to avoid temporary reverse rotation at startup or starting failure. The approach is based on the investigation of the stator inductance variation as a function of the rotor magnets position and the stator current space vector. It involves the application of a proper sequence of voltage pulses to the stator windings, and the measurement of the peak values of the resulting current in order to achieve the rotor position estimation. Actually, the current measurements show significant uncertainties which affect the rotor position detection. In order to avoid these problems, the authors propose a novel procedure which combines an iterative sequence of voltage pulses with a fuzzy logic processing of the current responses and phase currents derivation based on the DC-link current measurements. The proposed method has been implemented on a /spl mu/C digital signal processor (TMS320F240). The obtained results confirm the effectiveness of the proposed solution. It can be applied in sensorless drives, in drives equipped with nonabsolute position transducers, with a wide range of motors, and it does not require the knowledge of any of the motor parameters. 相似文献
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Staines C.S. Asher G.M. Bradley K.J. 《Industry Applications, IEEE Transactions on》1999,35(4):851-858
This paper describes a new method for estimating the incremental rotor position for an induction machine without using a shaft sensor. The method assumes a saturated induction motor having an engineered cage saliency spanning one pole pitch. The voltage-source inverter driving the machine is also used to inject a high-frequency signal which is needed to detect position. The paper discusses two ways in which this can be achieved. This method has been proven successful with a loaded machine at low speeds and overcomes problems associated with saturation 相似文献
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This paper deals with induction machines study by Finite Element Analysis (FEA) for position sensorless control drives based on rotating voltage carrier injection. It focuses the analysis of the rotor slotting saliency, under the variations of: (1) supply of the machine (both the high frequency rotating voltage carrier and the fundamental frequency supply), (2) reference flux of the drive, (3) load torque, and (4) rotor geometry design. The relative spatial harmonic of the stator inductance space-vector responsible for the rotor slotting effect has been chosen as an index for evaluating the response to the high frequency carrier. A methodology for retrieving the stator inductance space-vector from a FEA is proposed as well. Results of the variation of the rotor slotting spatial harmonic of the stator inductance with the carrier frequency, the rotor flux linkage, the load torque and the rotor geometry are presented. 相似文献