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This paper proposes a sensorless field-oriented control(FOC) strategy for Surface-mount Permanent Magnet Synchronous Motor(SPMSM). Firstly, a rotor flux estimation method with a high pass filter is introduced. Secondly, the basic principle of PLL and PI parameters tuning method derivation are demonstrated. And then, the compensation method for the phase shift caused by the high pass filter has been...
This paper has focused on the modified sensorless method for PMSM drive, which could estimate the rotor position information with the small DC-link capacitor. Due to the evaporation of electrolyte with working time, the electrolytic capacitor is vulnerable to the current ripple and heat. Thus, the film capacitor is selected as the DC-link capacitor in recent years. However, the capacitance of film...
In switched-flux permanent magnet (SFPM) machines, the 6th-harmonic back electromotive force (EMF) is dominant, whilst the 3rd-harmonic back-EMF is much smaller. This paper proposes several new position estimation methods for sensorless control based on the 6th-harmonic back-EMF. Firstly, by detecting the zero-crossings of the 6th-harmonic back-EMF with/without eliminating the influence of the 3rd-harmonic...
Wind power plant is source of harmonics and inter-harmonics. Estimation of these harmonics is very important and crucial task in modern distribution generation environment. This paper presents sliding window matrix pencil algorithm to estimate harmonics and inter harmonics produced by doubly fed induction generator based wind power plant. The series of simulation results under variable wind speed...
The phase inductance character of permanent magnet synchronous motor (PMSM) is closely related to its saliency, which has significantly influence on the position estimation using high frequency signal injection at low speed. In this paper, the relationship between phase inductance harmonics and position estimation error is discussed with qualitative and quantitative analysis, which is helpful for...
This paper proposes a novel rotor position estimation algorithm for the vector control of the doubly-fed induction generators (DFIGs) in wind power applications. The proposed algorithm uses a sliding mode observer (SMO) to estimate the rotor position information from the stator currents. The estimated rotor position is then used for the position sensorless vector control of the DFIG. The proposed...
Fault diagnosis of electric motors is still a challenging task for researchers. Various rotor cage faults detection techniques for electric motors have been proposed during the last two decades. One of these techniques widely used is the one based on the stator current spectral analysis which is still an open topic of research. This paper focusses on this technique; which has proven to be simple and...
The harmonic saliency signals created by rotor slot effects are found in the stator currents of most induction motors, and their frequencies are inherently correlated with the speed. In general, the relationships between speed and the signals are determined by rotor slot number, pole pairs and the way to obtain these signals. In this paper, a speed estimation scheme based on dominant rotor slot harmonic...
Detection of harmonics and inter-harmonics produced by wind power plant is very challenging task for the modern power system researchers. This paper presents estimation of harmonics produced by wind generator under variable wind speed by sliding window ESPRIT and sliding window Root-MUSIC algorithm. The series of simulation results demonstrate advantages of the sliding window ESPRIT over the sliding...
High-resolution position and velocity estimation algorithms based on binary Hall-effect sensors for low-cost vector control drives have been the subject of significant research in recent years. While different estimation algorithms have been proposed and analyzed, no contribution so far has dealt with Hall-effect sensor faults and their repercussion on the drive. This paper intends to fill this gap...
In wind power generators, position information is often required for tracking maximum power point as well as implementing control strategies for the Permanent Magnet (PM) generator. For such a system, failure of position sensor could potentially lead to major fault or require the system to be shut down. This could cause significant economic losses and also require unscheduled maintenance. This paper...
It is well known that slotting harmonics exist in most of the electrical machines. These harmonics may supply valuable information for condition monitoring of bearings, windings or rotor bars. Utilization of these harmonics for rotor speed and position estimation is limited mainly due to long sampling periods required by spectral estimation techniques. In this study, a novel speed and position estimation...
This paper presents a co-simulation based methodology combining Finite Element Analysis (FEA) with time domain analysis aimed at the performance evaluation of sensorless control strategies for AC motor drives. In the paper the tool is used to compare various sensorless techniques, based on additional high frequency injection signals, implemented on an Interior Permanent Magnet Synchronous Machine...
Low power DC motors are today largely used as actuators in home automation, office automation, medical equipment and automotive fields. Among automotive applications of DC motors, those regarding windows lifters, seat and mirror adjustment or multi-zone air conditioning, require a quite precise position control, leading to the introduction of suitable sensors. Unfortunately, the extra cost of even...
Air-gap flux of all electrical machines contains harmonics. Some of these harmonics stem from rotor slotting of the machine. These harmonics can be utilized for control or diagnostic purposes. In the literature, rotor slot harmonics are mostly utilized for condition monitoring. There is also some research utilizing them for rotor speed estimation. However, it is observed that in the existing work...
A hybrid estimator which combined the advantages of sliding mode estimator and extended Kalman filter for sensorless control of PMSM was proposed. The algorithm is more effective than sliding mode estimator for a motor with a distorted back-emf distribution. The hybrid estimator established a three-order EKF, considering the high order harmonics components of back-emf as system and measurement noise...
As the effects of power systempsilas frequency fluctuation and harmonics, errors are unavoidable when using the FFT to analyze the induction motor current signal. In order to saving the problem of frequency leakage and error of the FFT, the polynomial approximation method is employed to obtain simple formulas for frequency correction. This paper is aimed at using the frequency correction to estimate...
In this paper, the test voltage injection coupled with tracking of magnetic saliencies created by saturation and rotor slotting was used for shaft sensorless speed control of induction motor drives at zero and low speed. Method does not require additional wire connections and is usable for star or delta machine connection. The paper is proposing low memory method of elimination saturation effect from...
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