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Torque Ripple Reduction In A Permanent Magnet Synchronous Machine Using Repetitive Control Techniques Drift
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Book Synopsis Torque ripple reduction in a permanent magnet synchronous machine using repetitive control techniques (Drift) by : Yi Yuan
Download or read book Torque ripple reduction in a permanent magnet synchronous machine using repetitive control techniques (Drift) written by Yi Yuan and published by . This book was released on 2014 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les machines synchrones à aimants permanents (MSAP) sont de plus en plus utilisées dans de nombreuses applications grâce à leur efficacité, fiabilité et performances. Cependant, les oscillations de couple peuvent provoquer des oscillations de la vitesse qui sont considérées comme un problème majeur dans certaines applications à faible vitesse. Par conséquent, la commande répétitive (CR) est choisie pour sa forte capacité à réduire ces perturbations périodiques et réduire les oscillations de couple. Il existe deux problèmes principaux lors de l’application de la CR à une MSAP. D’abord, la CR ne peut réaliser la réduction souhaitée que dans le cas d’une vitesse constante. Grâce à la relation fixe entre ces oscillations et la position du rotor, nous proposons de prendre l’angle mécanique comme la nouvelle variable du fonctionnement de la CR. Ce nouveau régulateur est appelé régulateur répétitif basé sur la position angulaire. L’avantage de ce contrôleur est sa capacité de réduction même dans le cas d’une vitesse variable. Le deuxième inconvénient de l’application de la CR est sa difficulté d’implantation dans les systèmes industriels. Ainsi, nous proposons d’ajouter le contrôleur répétitif dans un capteur de vitesse et de développer une nouvelle technique appelée capteur répétitif intelligent. Avec ce capteur, l’application de la technique de CR ne requiert aucune modification du contrôleur, mais il est nécessaire de remplacer le capteur normal par le capteur répétitif intelligent. Finalement, ces deux nouvelles techniques sont réalisées ensemble sur un banc d’essais et leur efficacité est validée par des résultats expérimentaux.
Book Synopsis Permanent Magnet Synchronous Machines and Drives by : Wei Xu
Download or read book Permanent Magnet Synchronous Machines and Drives written by Wei Xu and published by CRC Press. This book was released on 2023-07-31 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permanent magnet synchronous motors (PMSMs) are popular in the electric vehicle industry due to their high-power density, large torque-to-inertia ratio, and high reliability. This book presents an improved field-oriented control (FOC) strategy for PMSMs that utilizes optimal proportional-integral (PI) parameters to achieve robust stability, faster dynamic response, and higher efficiency in the flux-weakening region. The book covers the combined design of a PI current regulator and varying switching frequency pulse-width modulation (PWM), along with an improved linear model predictive control (MPC) strategy. Researchers and graduate students in electrical engineering, systems and control, and electric vehicles will find this book useful. Features: • Implements evolutionary optimization algorithms to improve PMSM performance. • Provides coverage of PMSM control design in the flux-weakening region. • Proposes a modern method of model predictive control to improve the dynamic performance of interior PMSM. • Studies the dynamic performance of two kinds of PMSMs: surface-mounted and interior permanent magnet types. • Includes several case studies and illustrative examples with MATLAB®. This book is aimed at researchers, graduate students, and libraries in electrical engineering with specialization in systems and control and electric vehicles.
Book Synopsis Cogging Torque Reduction for Interior Permanent Magnet Synchronous Motors by : Miquel Tost Candel
Download or read book Cogging Torque Reduction for Interior Permanent Magnet Synchronous Motors written by Miquel Tost Candel and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Interior permanent magnet synchronous machines show a good range of behaviours, which make these kinds of machines good candidates for an electromechanical energy conversion. However, in order to improve their accuracy in their torque responses, the cogging torque and torque ripple phenomena should be mitigated to obtain better performance of the machine. In order to reduce the cogging torque and torque ripple, control techniques as well as geometric parameters of the machine have to be improved. In this thesis, geometric parameters such as the use of the fractional slot windings, the improvement of the pole-arc to pole-pitch ratio and the dimensions of the stator slots are considered for the better minimization of the cogging torque and torque ripple. The results are presented to show the performance of the IPMSM with fractional slot windings as well as the reduction of the cogging torque and torque ripple. Furthermore, four models of IPMSM with fractional and integer slot windings are going to be compared with the aim of the attenuation of the cogging torque phenomenon.
Book Synopsis Direct Torque Control of Dual Three Phase Permanent Magnet Synchronous Machine Drives, with Particular Reference to Reduction of Current Harmonics and Torque Ripples by : Bo Shao
Download or read book Direct Torque Control of Dual Three Phase Permanent Magnet Synchronous Machine Drives, with Particular Reference to Reduction of Current Harmonics and Torque Ripples written by Bo Shao and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Minimization of Torque Ripple in Permanent Magnet Synchronous Motors Through Direct Torque Control by : Kevin N.L. Heward-Mills
Download or read book Minimization of Torque Ripple in Permanent Magnet Synchronous Motors Through Direct Torque Control written by Kevin N.L. Heward-Mills and published by . This book was released on 2018 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permanent Magnet motors are of pertinent use in factory automation, machine tool applications, electric vehicles, robotics applications and many others. Within these industries, the measure of accuracy that is required on a constant basis is stymied by the common obstacle of harmonic ripple in torque, caused by discrepancies in flux within the air-gap of the motors. This ripple reflects in performance of the motor drive and consequently causes a harmonic disturbance in stator current. In order to understand this phenomenon and come about various remedial practices, a detailed study is carried out in this project to investigate the causes of torque ripple in permanent magnet synchronous motor drives, and the methods used in the minimization of this ripple. Minimization of these ripples in torque would prove essential to save erroneous manufacturing deviations that they characterize in the above-mentioned industry applications. It would also help in saving industrial financial resources, increase reliability, as well as save time spent in corrections of these errors. A model is presented in MATLAB/Simulink to implement the Direct Torque approach of ripple minimization.
Book Synopsis Adaptive Position Control of Permanent Magnet Synchronous Motors and Torque Ripple Compensation by : O. Seta Boğasyan
Download or read book Adaptive Position Control of Permanent Magnet Synchronous Motors and Torque Ripple Compensation written by O. Seta Boğasyan and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is about the modeling and control of permanent magnet synchronous motors which are prime candidates for direct drive applications, due to their characteristics like high torque over a wide speed range, high acceleration/deceleration and high torqe/intertia ratio. Direct drive applications solve problems like backlash, friction and coupling effects, but as a result the filtering effect on torque ripple is also lost which may give rise to undesirable performance in robotics. Thus initially in this thesis, the modeling of the PMSM is done to include the space harmonics which give rise to torque ripple. First, past studies on torque ripple suppression are reviewed and new and more efficient methods are presented, offering more generality and flexibility of control. Assuming these methods first, the adaptive model folowing control of PMSM is studied and simulated on a single link manipulator to demonstrate theimproved performance of the system in terms of tracking error and torque ripple suppression. Then, simulation results are obtained for an adaptive feedback linearization scheme developed for the smooth motion of a single link manipulator, using parameter identification. Next, experimental results are obtained for the position control of PMSM using conventional PID, optimal and adaptive control. The test stand is arranged to simulate a single link manipulator with varying inertia and it has been noted that the adaptive control method gives the overall best system responses in terms of error convergence. However, with this control scheme no parameter convergence has been achieved. Thus, in the final part of the thesis simulation results are given using the same adaptive control method but for a persistently exciting reference signal instead of the previous critically damped one and parameter convergence is obtained, as expected.
Book Synopsis Noise Reduction Control Strategy of a Permanent Magnet Synchronous Machine for Vehicle Applications by : Randy Gene Doolittle
Download or read book Noise Reduction Control Strategy of a Permanent Magnet Synchronous Machine for Vehicle Applications written by Randy Gene Doolittle and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was to investigate a permanent magnet synchronous machine which will be produced by an industry partner of the Institut für Stromrichtertechnik und Elektrische Antriebe (ISEA) an institute of the Rheinisch Westfälisch Technische Hochschule - Aachen, Germany (RWTH). The machine manufacturer noted certain abnormalities with the frequency spectrum produced by an electric machine that they were developing; this problem was brought to ISEA in order to be investigated. My work continues the work of my supervisor, Dipl.- Ing Matthias Bösing, and seeks to further examine the machine for a much wider range of operating points, determine the relationship between current amplitude, harmonics, control angle and rotor position on radial force components of the machine and therefore stresses on the stator; which are the primary causes of electrical machine noise. Rather than investigate acoustic issues in particular, the study was limited to the study of electromagnetically generated radial force ripple, which is the cause of stator deflection modes and therefore the emission of sound waves. The primary results of this thesis researched the operation of a permanent magnet synchronous machine and described its behavior with regards to force, torque, and force and torque ripple and their spectrums versus numerous parameters, including control angle, secant current and rotor position. Next, the work used provided data, literature and the simulation results for this thesis in order to deconstruct the operation regions of the particular machine and therefore link the causes of particular noise spectral components to the operation of the machine. From this it was possible to identify potential ways to eliminate these areas of noise. Following this, the thesis examined a particular abnormality in the torque and force waveforms produced by the machine and devised actions which could correct this abnormality. After identifying this asymmetry, the work explored how to choose an optimal control strategy for eliminating particular harmonics based on the simulated operating points and a desired command torque. Finally, the research built on the previous work by supplementing the method of current harmonic injection for eliminating radial force harmonics in this machine, with a method of determining an optimal operating point before the injection currents are calculated.
Book Synopsis Torque Ripple Minimisation in Permanent Magnet Synchronous Motor Drives by : J. Power
Download or read book Torque Ripple Minimisation in Permanent Magnet Synchronous Motor Drives written by J. Power and published by . This book was released on 1995 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Torque Ripple Reduction in A.c. Permanent Magnet Servo Motor Drives by : Mi Tang
Download or read book Torque Ripple Reduction in A.c. Permanent Magnet Servo Motor Drives written by Mi Tang and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Direct Thrust Force Control of Linear Permanent Magnet Synchronous Motor by : Muhammad Ali Masood Cheema
Download or read book Advanced Direct Thrust Force Control of Linear Permanent Magnet Synchronous Motor written by Muhammad Ali Masood Cheema and published by Springer. This book was released on 2021-02-13 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the direct thrust force control (DTFC) of tubular surface-mount linear permanent magnet synchronous motors (linear PMSMs). It presents a detailed account and analysis of several advanced nonlinear control schemes, based on the direct thrust control principle, to achieve a reduction in steady-state ripple in thrust force with faster transient response, and describes their experimental validation. It also provides rigorous details of the dynamic modelling of linear PMSMs from a control system perspective, and demonstrates the superior control performance of the proposed techniques compared to the current state-of-the-art techniques. Lastly, the book proposes and validates a stator flux observer for sensorless speed estimation comprising a linear state observer and an improved sliding mode component.
Book Synopsis Cogging Torque, Torque Ripple and Radial Force Analysis of Permanent Magnet Synchronous Machines by : Mohammed Rakibul Islam
Download or read book Cogging Torque, Torque Ripple and Radial Force Analysis of Permanent Magnet Synchronous Machines written by Mohammed Rakibul Islam and published by . This book was released on 2009 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This dissertation presents a methodology for designing low noise small permanent magnet synchronous motor (PMSM) drives by addressing the issues of cogging torque, torque ripple, acoustic noise and vibration. The methodology incorporates several pole shaping and magnet skew schemes in different motor topologies with similar envelop dimensions and output characteristics intended for an automotive application. The developed methodology is verified with finite element analysis (FEA) and experiments. A comprehensive design methodology has been developed for obtaining the analytical design of the machine for a given set of output characteristics. Using the FEA, the effects of various magnet shapes and skew on the machine performances (e.g. cogging torque, torque ripple etc.) have been analyzed. The FEA and experimental results show that for certain magnet designs and configurations the skewing does not necessarily reduce the ripple in the electromagnetic torque, but may cause it to increase. An analytical model to predict radial vibration due to magnetic radial pressure on the motor structure has also been developed. This model is used for predicting the noise power level for several motor topologies designed for similar powe level applications. The predicted noise levels are utilized to develop guidelines for selecting motor configurations, internal dimensions and winding types for a low-noise PMSM. The selection of low-noise PMSM is not a straightforward one; rather it is a compromise between torque harmonics and radial vibration of the machines. Some PMSM configurations with less radial vibration might have seen to posses excessive torque ripples and thereby violating the other requirements for the motor to be less noisy. Experiments are conducted to record the torque ripple variation for different magnet shapes and skew in order to validate the results of FE models. The experimental results have successfully correlated with the FE computations."--Abstract.
Book Synopsis Improvement of Torque and Speed Control of Permanent Magnet Synchronous Machine in the Flux-weakening Region by : Dakai Hu
Download or read book Improvement of Torque and Speed Control of Permanent Magnet Synchronous Machine in the Flux-weakening Region written by Dakai Hu and published by . This book was released on 2014 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permanent Magnet Synchronous Machines (PMSM) have established their predominance over other types of machines in the motor drive industry for the past several decades. High efficiency and high torque and power density, which are the most distinguishing traits of PMSM drives, have enabled PMSM drives to be applied in almost all areas of industry, from home appliances to vehicle tractions. While the permanent magnet, which can be considered as an energy source, is what contributes to the high power density of PMSM; at the same time, it also causes inconvenience since the magnetic field it produces is relatively fixed. For high speed applications, flux-weakening (a.k.a. field-weakening) is almost always required of PMSM drives. When In the flux-weakening region, issues such as limited constant power speed ratio, current control instability, low torque control accuracy still exist, and it calls for advanced control strategies that can improve the performance of PMSM across a wide speed and torque range. The torque and speed control methods proposed in this dissertation provided improvements to existing control strategies of PMSM in the flux-weakening region. To reduce the current oscillation issue related to voltage regulated flux-weakening controller, the proposed modifications redesigned the current trajectory, and extended the operation region to the Maximum Torque per Volt (MTPV) region. To achieve accurate torque control in the flux-weakening region, an open-loop torque controller was proposed. Together with this controller, a novel PMSM characterizing test procedure was developed for the extraction of PMSM machine data. The results from this characterizing test also led to the establishment of a new high fidelity PMSM modeling method that can capture the nonlinearity of PMSM machines. All control strategies proposed in this dissertation apply both in surface-mounted (IPM) and interior-mounted (SPM) permanent magnet synchronous machines.
Book Synopsis Parameter, Speed, Position Estimations and Torque Ripple Minimization in Permanent Magnet Synchronous Motor Drives by : Tong Liu
Download or read book Parameter, Speed, Position Estimations and Torque Ripple Minimization in Permanent Magnet Synchronous Motor Drives written by Tong Liu and published by . This book was released on 1999 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct torque control of permanent magnet synchronous machines by : Julius Luukko
Download or read book Direct torque control of permanent magnet synchronous machines written by Julius Luukko and published by . This book was released on 2000 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Torque Control of Permanent Magnet Synchronous Machines with Applications to Motor Drives and Wind Energy Conversion Systems by : Zhe Zhang
Download or read book Direct Torque Control of Permanent Magnet Synchronous Machines with Applications to Motor Drives and Wind Energy Conversion Systems written by Zhe Zhang and published by . This book was released on 2015 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, the root causes of ripple production in the PMSM systems controlled by digital DTC schemes are explicitly analyzed and demonstrated. Based on the analysis, three improved DTC schemes are developed to effectively reduce the torque, flux and current ripple levels afflicting the conventional DTC. The improvement strategies in the proposed DTC schemes are generally classified into two categories. First, the space vector modulation (SVM) is integrated into DTC using fewer machine parameters and no proportional-integral (PI) regulators. Second, the hysteresis controller in conventional DTC is modified to develop new switching-table-based DTC following the idea of the conventional DTC. All of the proposed DTC schemes can effectively solve the problems associated with the conventional DTC, i.e., the large ripple levels and high-demand hardware, and provide viable and cost-effective solutions for various industrial PMSM-based applications. The inherent properties of the conventional DTC, such as fast dynamic response, no PI and current regulators, and no coordinate transformations are well preserved.
Book Synopsis Investigation of Torque Characteristics of Permanent Magnet and Electrically Excited Machines by : Wenqiang Chu
Download or read book Investigation of Torque Characteristics of Permanent Magnet and Electrically Excited Machines written by Wenqiang Chu and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is focused on the comparative investigation on the torque characteristics, both average torque and torque ripple, of permanent magnet (PM) and electrically excited (EE) machines for direct drive applications, which require both high torque density and low torque ripple. The effectiveness of two of the most widely used methods, i.e., rotor shaping and skewing, for torque ripple reduction in EE and PM machines is investigated. It is found that the effectiveness of skewing largely depends on the axial variation of torque ripple phase but less on its magnitude under skewing. It is further found that, in both linear and nonlinear cases, the on-load torque ripple cannot be fully eliminated by skewing one on-load torque ripple period or any other angles, except 360o electrical, which is impractical. The torque ripple may be even increased by skewing, especially when the cogging torque is low and electric loading is high. An improved skewing is developed by optimising both the skewing and current phase advance angles when the conventional skewing method fails. Compared with PM machines, rotor shaping is less effective on torque ripple reduction in EE machines due to the asymmetric magnetic saturation of the stator and rotor cores. However, if rotor skewing is used then EE machines can still achieve the same low level of torque ripple as PM machines. In order to better understand characteristics of on-load torque and hence improve it, the on-load torque separation of PM machines is investigated as well. It is found that the average torque components can be appropriately separated using the virtual work principle but not by the Maxwell stress tensor. For the on-load cogging torque calculation, which is the most difficult challenge for on-load torque ripple separation, a new method is proposed by combining the virtual work principle with an improved frozen permeability method. For torque density optimisation, analytical methods are often desirable. This thesis develops an analytical model for PM machines having external rotor. It is shown that the torque density is maximum when the average airgap flux density is slightly lower than half of the maximum flux density in the stator. In order to compare the torque densities between EE and PM machines, a simplified analytical model of EE machines is developed as well. It is shown that, for EE machines, there is an optimal pole number to maximize the torque densities and it is more advantageous for large volume applications. PM machines can exhibit higher than √2 times torque densities of EE machines. The designs of maximum torque per weight are more cost-effective and result in a significantly larger airgap diameter than the designs of maximum torque per volume.
Book Synopsis Position-sensorless Control of Permanent Magnet Synchronous Machines Over Wide Speed Range by : Song Chi
Download or read book Position-sensorless Control of Permanent Magnet Synchronous Machines Over Wide Speed Range written by Song Chi and published by . This book was released on 2007 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Permanent-magnet-synchronous-machine (PMSM) drives have been increasingly applied in a variety of industrial applications which require fast dynamic response and accurate control over wide speed ranges. Two control techniques are proposed in this dissertation for PMSM drives, namely flux-weakening control incorporating speed regulation and sliding mode observer with feedback of equivalent control. The research objectives are to extend the operating speed range of the PMSM drive system and improve its control robustness and adaptability to variations of operating conditions as well as dynamic performance. First, a robust flux-weakening control scheme is studied. With a novel current control strategy, the demagnetizing stator current required for the flux-weakening operation can be automatically generated based on the inherent cross-coupling effects in PMSM between its direct-axis and quadrature-axis current in the synchronous reference frame. The proposed control scheme is able to achieve both flux-weakening control and speed regulation simultaneously by using only one speed/flux-weakening controller without the knowledge of accurate machine parameters and dc bus voltage of power inverter. Moreover, no saturation of current regulators occurs under any load conditions, resulting in control robustness in the flux-weakening region. Secondly, a sliding mode observer is developed for estimating rotor position of PMSM without saliency in the implementation of position-sensorless vector control. A concept of feedback of equivalent control is applied to extend the operating range of sliding mode observer and improve its angle-estimation performance. Compared to conventional sliding mode observers, the proposed one features the flexibility to design parameters of sliding mode observer operating in a wide speed range. The estimation error of rotor position can be reduced by properly selecting the feedback gain of equivalent control. In addition, a flux-based sliding mode observer with adaptive feedback gain is investigated. The constant magnitude of equivalent control makes it easier to design the switching gain of discontinuous control in the sliding mode observer. As a result, the problematic chattering phenomenon normally prevailing at low speeds due to high switching gains can be mitigated or even eliminated. The feasibility and effectiveness of the control techniques addressed in this dissertation are verified by both computer simulation and experimental results.
