Modeling of Losses in a Permanent Magnet Machine Fed by a PWM Supply PDF Download
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Author: Mehdi Taghizadeh Kakhki
Publisher:
ISBN:
Category :
Languages : en
Pages : 131
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Book Description
In order to respect the constraints for efficiency in an electrical machine, losses should be accurately estimated. In the case of a permanent magnet machine fed by a PWM supply, the high frequency harmonic content of the current (associated with the modulation scheme), may generate additional losses in the machine which the conventional models tend to overlook. Development of new models which may take account of these additional losses will allow us to improve the analysis and design of the electrical machines. In this work various models for the prediction of losses in a permanent magnet machine including the mechanical losses, copper losses and magnetic losses are presented. A new loss expression for taking account of the skin effect in a laminated magnetic material due to high frequency harmonic content of the stator current is developed. Regarding hysteresis losses, an algorithm for the identification of the minor hysteresis cycles is presented. An analytical model for the estimation of the PWM losses in the stator of the permanent magnet machine, and a new method for the direct estimation of eddy current losses in the lamination material by 2D-FE analysis are also developed. The design methodology for the design of a surface mounted permanent magnet machine is briefly described. A prototype machine is designed and realised to measure the losses in a variety of operating conditions and validate the loss models. Various models for magnetic losses are compared in order to find the most appropriate method in the time or frequency domains. The method which offers the best performance is then validated in a wide range of operating conditions. The losses in two PM rotors (with or without magnet segmentation) are compared and the effect of magnet segmentation and the choice of rotor yoke material are investigated by 2D FE analysis. These results are also used to evaluate the performance of an analytical model for the prediction of eddy current losses in the rotor magnets.
Author: Mehdi Taghizadeh Kakhki
Publisher:
ISBN:
Category :
Languages : en
Pages : 131
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Book Description
In order to respect the constraints for efficiency in an electrical machine, losses should be accurately estimated. In the case of a permanent magnet machine fed by a PWM supply, the high frequency harmonic content of the current (associated with the modulation scheme), may generate additional losses in the machine which the conventional models tend to overlook. Development of new models which may take account of these additional losses will allow us to improve the analysis and design of the electrical machines. In this work various models for the prediction of losses in a permanent magnet machine including the mechanical losses, copper losses and magnetic losses are presented. A new loss expression for taking account of the skin effect in a laminated magnetic material due to high frequency harmonic content of the stator current is developed. Regarding hysteresis losses, an algorithm for the identification of the minor hysteresis cycles is presented. An analytical model for the estimation of the PWM losses in the stator of the permanent magnet machine, and a new method for the direct estimation of eddy current losses in the lamination material by 2D-FE analysis are also developed. The design methodology for the design of a surface mounted permanent magnet machine is briefly described. A prototype machine is designed and realised to measure the losses in a variety of operating conditions and validate the loss models. Various models for magnetic losses are compared in order to find the most appropriate method in the time or frequency domains. The method which offers the best performance is then validated in a wide range of operating conditions. The losses in two PM rotors (with or without magnet segmentation) are compared and the effect of magnet segmentation and the choice of rotor yoke material are investigated by 2D FE analysis. These results are also used to evaluate the performance of an analytical model for the prediction of eddy current losses in the rotor magnets.
Author: Frédéric Dubas
Publisher: MDPI
ISBN: 3036503986
Category : Technology & Engineering
Languages : en
Pages : 252
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Book Description
This book is a comprehensive set of articles reflecting the latest advances and developments in mathematical modeling and the design of electrical machines for different applications. The main models discussed are based on the: i) Maxwell–Fourier method (i.e., the formal resolution of Maxwell’s equations by using the separation of variables method and the Fourier’s series in 2-D or 3-D with a quasi-Cartesian or polar coordinate system); ii) electrical, thermal and magnetic equivalent circuit; iii) hybrid model. In these different papers, the numerical method and the experimental tests have been used as comparisons or validations.
Author: Ming Cheng
Publisher: John Wiley & Sons
ISBN: 1119900344
Category : Technology & Engineering
Languages : en
Pages : 568
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Book Description
General Airgap Field Modulation Theory for Electrical Machines Introducing a new theory for electrical machines Air-gap magnetic field modulation phenomena have been widely observed in electrical machines. This book serves as the first English-language overview of these phenomena, as well as developing systematically for the first time a general theory by which to understand and research them. This theory not only serves to unify analysis of disparate electrical machines, from conventional DC machines, induction machines, and synchronous machines to unconventional flux-switching permanent magnet machines, Vernier machines, doubly-fed brushless machines etc., but also paves the way towards the creation of new electrical machine topologies. General Airgap Field Modulation Theory for Electrical Machines includes both overviews of key concepts in electrical machine engineering and in-depth specialized analysis of the novel theory itself. It works through the applications of the developed theory before proceeding to both qualitative analysis of the theory’s operating principles and quantitative analysis of its parameters. Readers will also find: The collective experience of four award-winning authors with long records of international scholarship on this subject Three separate chapters covering the principal applications of the theory, with detailed examples Discussion of potential innovations made possible by this theory General Airgap Field Modulation Theory for Electrical Machines is an essential introduction to this theory for postgraduates, researchers, and electrical engineers.
Author: Cungang Hu
Publisher: Springer Nature
ISBN: 9819739403
Category :
Languages : en
Pages : 822
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Book Description
Author: Weijiang Chen
Publisher: Springer Nature
ISBN: 9813366095
Category : Technology & Engineering
Languages : en
Pages : 879
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Book Description
This book includes the original, peer-reviewed research papers from the 9th Frontier Academic Forum of Electrical Engineering (FAFEE 2020), held in Xi’an, China, in August 2020. It gathers the latest research, innovations, and applications in the fields of Electrical Engineering. The topics it covers including electrical materials and equipment, electrical energy storage and device, power electronics and drives, new energy electric power system equipment, IntelliSense and intelligent equipment, biological electromagnetism and its applications, and insulation and discharge computation for power equipment. Given its scope, the book benefits all researchers, engineers, and graduate students who want to learn about cutting-edge advances in Electrical Engineering.
Author: Slawomir Tumanski
Publisher: CRC Press
ISBN: 1439829527
Category : Science
Languages : en
Pages : 398
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Book Description
Collecting state-of-the-art knowledge from information scattered throughout the literature, this handbook describes magnetic materials and sensors, the testing of magnetic materials, and applications of magnetic measurements. It presents an up-to-date, accessible account of modern magnetic measurement techniques. The book discusses the fundamentals of magnetism and covers contemporary magnetic materials and sensors. It also explores applications of magnetic diagnostics in medicine, magnetoarcheology, and magnetic imaging. An extensive list of references is included at the end of each chapter.
![Modelling of Iron Losses of Permanent Magnet Synchronous Motors [microform] PDF](https://books.google.com/books/content/images/frontcover/tHb7ygAACAAJ?fife=w80-h100)
Author: Chunting Mi
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612589599
Category :
Languages : en
Pages : 258
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Author:
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 2304
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Author: Lei Gu
Publisher:
ISBN:
Category : Conformal mapping
Languages : en
Pages :
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Book Description
Permanent magnet synchronous machine (PMSM) is becoming more prevalent in industry applications due to its high power and torque density. The magnetic field distribution in the airgap of the motor is critical in predicting the performance, as well as implementing optimal design and control. Conventional methods to calculate the magnetic field include analytical lumped model, equivalent magnetic circuit (EMC) method, and finite element analysis (FEA) method. However, they have their limitation in terms of accuracy and computation time. Field reconstruction method was recently proposed for modeling of a surface mounted permanent magnet synchronous motor (SPMSM). It provides a fast method to reconstruct the magnetic field distribution with both high computation efficiency and good accuracy. However, due to the partial saturation effect in interior permanent magnet synchronous machine (IPMSM), conventional FRM method cannot be directly applied for modeling of IPMSM. An extended FRM (EFRM) is proposed to overcome the issue of partial saturation and slotting effect in IPMSM. Conformal mapping (CM) was recently proposed to calculate the magnetic field analytically. In general, CM is to map the complicated air gap structure into a simplified structure such as a rectangle or an annulus, in which the analytical solution of the magnetic field is readily available. The analytical solution of the magnetic field in simplified geometry is then transferred back to obtain the magnetic field distribution in original air gap geometry. Also, the effect of stator slots can be modeled with an equivalent permeability. As such original stator slots are transfomed into a slotless structure. This greatly simplifies the process of CM. What’s more, considering the equivalent permeability method would simplify the stator slot to a slotless structure which would greatly reduce the time to build the basis functions in EFRM. The combination of EFRM and CM would be an effective method to model IPMSM. In summary, CM shows a great advantage in achieving high calculation efficiency in modeling of PMSM though the accuracy is limited by only the saturation effects. The application of EFRM is extended to calculate the core loss and to estimate the average torque in PMSM. FEA simulation and experiments are conducted to verify the effectiveness of the proposed methods.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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