Analysis of Cogging Torque in Permanent Magnet Motors PDF Download

Author: Touzhu.* Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 126

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Author: Kai Wang
Publisher: Springer
ISBN: 981130629X
Category : Technology & Engineering
Languages : en
Pages : 216

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Book Description
This book investigates the utilization of harmonics in the permanent magnet (PM) or rotor shape to improve the torque density of PM brushless AC machines including three-phase inner rotor and outer rotor machines, five-phase machines, dual three-phase machines, linear machines, by means of analytical, finite element analyses, and as well as experimental validation. The torque density can be improved while the torque ripple remains low in PM shaping utilizing the 3rd harmonic. In this book, the analytical expression of output torque is derived for PM machines with rotor shape using the 3rd harmonic, and then the optimal 3rd harmonic for maximizing torque is analytically obtained. The book compares the PM shape in surface-mounted PM (SPM) machines and the rotor lamination shape in interior PM (IPM) machines utilizing the 3rd harmonic, and it becomes clear that their shaping methods and amount of torque improvement are different. In a five-phase PM machine, the 3rd harmonic can be utilized in both the current waveform and PM shapes to further improve the output torque. For the dual three-phase SPM machines without deteriorating the torque more than 30% when the optimal 3rd harmonic into both the current and PM shape are injected. The harmonics in airgap flux density have significant influence on the cogging torque, stator iron flux distribution, and radial force between the rotor and stator. These effects has been investigated as well in this book.

Author: Mohammed Rakibul Islam
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 200

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Book Description
"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.

Author: Coy Brian Studer
Publisher:
ISBN:
Category :
Languages : en
Pages : 492

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Author: Ungtae Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 320

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Book Description

Author: Sadegh Vaez-Zadeh
Publisher: Oxford University Press
ISBN: 0191060674
Category : Technology & Engineering
Languages : en
Pages : 384

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Book Description
Permanent magnet synchronous (PMS) motors stand at the forefront of electric motor development due to their energy saving capabilities and performance potential. The motors have been developed in response to mounting environmental crises and growing electricity prices, and they have enabled the emergence of motor drive applications like those found in electric and hybrid vehicles, fly by wire, and drones. Control of Permanent Magnet Synchronous Motors is a timely advancement along that path as the first comprehensive, self-contained, and thoroughly up-to-date book devoted solely to the control of PMS motors. It offers a deep and extended analysis, design, implementation, and performance evaluation of major motor control methods, including Vector, Direct Torque, Predictive, Deadbeat, and Combined Control, in a systematic and coherent manner. All major Sensorless Control and Parameter Estimation methods are also studied. The book places great emphasis on energy saving control schemes.

Author: Duane C. Hanselman
Publisher:
ISBN: 9781932133639
Category : Electric motors, Brushless
Languages : en
Pages : 0

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Book Description
Explaining techniques for magnetic modelling and circuit analysis, this book shows how magnetic circuit analysis applies to motor design. It describes the major aspects of motor operation and design, and develops design equations for radial flux and axial flux motors. It is intended for electrical, electronics and mechanical engineers.

Author: Duane C. Hanselman
Publisher: McGraw-Hill Companies
ISBN:
Category : Science
Languages : en
Pages : 216

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Book Description
Written for electrical, electronics, & mechanical engineers responsible for designing & specifying motors, the book provides details of brushless DC & synchronous motors, as well as both radial & axial motor topologies. Beginning with a discussion of the fundamentals of generic motor design, it logically progresses to a set of more advanced, yet easily understandable, concepts for designing brushless permanent-magnet motors. In addition, the author fully explains techniques for magnetic modeling & circuit analysis, shows how magnetic circuit analysis applies to motor design, describes all major aspects of motor operation & design in simple mathematical terms, develops rigorous design equations for radial flux & axial flux motors, & illustrates basic motor drive schemes. All common motor design terms are clearly defined & a wealth of charts, tables & equations are included.

Author: Jacek F. Gieras
Publisher: CRC Press
ISBN: 1439859019
Category : Technology & Engineering
Languages : en
Pages : 591

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Book Description
The importance of permanent magnet (PM) motor technology and its impact on electromechanical drives has grown exponentially since the publication of the bestselling second edition. The PM brushless motor market has grown considerably faster than the overall motion control market. This rapid growth makes it essential for electrical and electromechanical engineers and students to stay up-to-date on developments in modern electrical motors and drives, including their control, simulation, and CAD. Reflecting innovations in the development of PM motors for electromechanical drives, Permanent Magnet Motor Technology: Design and Applications, Third Edition demonstrates the construction of PM motor drives and supplies ready-to-implement solutions to common roadblocks along the way. This edition supplies fundamental equations and calculations for determining and evaluating system performance, efficiency, reliability, and cost. It explores modern computer-aided design of PM motors, including the finite element approach, and explains how to select PM motors to meet the specific requirements of electrical drives. The numerous examples, models, and diagrams provided in each chapter facilitate a lucid understanding of motor operations and characteristics. This 3rd edition of a bestselling reference has been thoroughly revised to include: Chapters on high speed motors and micromotors Advances in permanent magnet motor technology Additional numerical examples and illustrations An increased effort to bridge the gap between theory and industrial applications Modified research results The growing global trend toward energy conservation makes it quite possible that the era of the PM brushless motor drive is just around the corner. This reference book will give engineers, researchers, and graduate-level students the comprehensive understanding required to develop the breakthroughs that will push this exciting technology to the forefront.

Author: Chang-liang Xia
Publisher: John Wiley & Sons
ISBN: 1118188365
Category : Technology & Engineering
Languages : en
Pages : 306

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Book Description
An advanced introduction to the simulation and hardware implementation of BLDC motor drives A thorough reference on the simulation and hardware implementation of BLDC motor drives, this book covers recent advances in the control of BLDC motor drives, including intelligent control, sensorless control, torque ripple reduction and hardware implementation. With the guidance of the expert author team, readers will understand the principle, modelling, design and control of BLDC motor drives. The advanced control methods and new achievements of BLDC motor drives, of interest to more advanced readers, are also presented. Focuses on the control of PM brushless DC motors, giving readers the foundations to the topic that they can build on through more advanced reading Systematically guides readers through the subject, introducing basic operational principles before moving on to advanced control algorithms and implementations Covers special issues, such as sensorless control, intelligent control, torque ripple reduction and hardware implementation, which also have applications to other types of motors Includes presentation files with lecture notes and Matlab 7 coding on a companion website for the book