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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: 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: Aleksandar Borisavljevic
Publisher: Springer Science & Business Media
ISBN: 3642334571
Category : Technology & Engineering
Languages : en
Pages : 229
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Book Description
There is a growing number of applications that require fast-rotating machines; motivation for this thesis comes from a project in which downsized spindles for micro-machining have been researched. The thesis focuses on analysis and design of high-speed PM machines and uses a practical design of a high-speed spindle drive as a test case. Phenomena, both mechanical and electromagnetic, that take precedence in high-speed permanent magnet machines are identified and systematized. The thesis identifies inherent speed limits of permanent magnet machines and correlates those limits with the basic parameters of the machines. The analytical expression of the limiting quantities does not only impose solid constraints on the machine design, but also creates the way for design optimization leading to the maximum mechanical and/or electromagnetic utilization of the machine. The models and electric-drive concepts developed in the thesis are evaluated in a practical setup.
Author: Sandra Eriksson
Publisher: MDPI
ISBN: 3039213504
Category : Technology & Engineering
Languages : en
Pages : 282
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Book Description
Interest in permanent magnet synchronous machines (PMSMs) is continuously increasing worldwide, especially with the increased use of renewable energy and the electrification of transports. This book contains the successful submissions of fifteen papers to a Special Issue of Energies on the subject area of “Permanent Magnet Synchronous Machines”. The focus is on permanent magnet synchronous machines and the electrical systems they are connected to. The presented work represents a wide range of areas. Studies of control systems, both for permanent magnet synchronous machines and for brushless DC motors, are presented and experimentally verified. Design studies of generators for wind power, wave power and hydro power are presented. Finite element method simulations and analytical design methods are used. The presented studies represent several of the different research fields on permanent magnet machines and electric drives.
Author: Nguyen Phung Quang
Publisher: Springer
ISBN: 3662469154
Category : Technology & Engineering
Languages : en
Pages : 374
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Book Description
This book addresses the vector control of three-phase AC machines, in particular induction motors with squirrel-cage rotors (IM), permanent magnet synchronous motors (PMSM) and doubly-fed induction machines (DFIM), from a practical design and development perspective. The main focus is on the application of IM and PMSM in electrical drive systems, where field-orientated control has been successfully established in practice. It also discusses the use of grid-voltage oriented control of DFIMs in wind power plants. This second, enlarged edition includes new insights into flatness-based nonlinear control of IM, PMSM and DFIM. The book is useful for practitioners as well as development engineers and designers in the area of electrical drives and wind-power technology. It is a valuable resource for researchers and students.
Author: Amirmasoud Takbash
Publisher:
ISBN:
Category :
Languages : en
Pages : 159
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Book Description
Permanent magnet synchronous machines (PMSMs) with rare-earth magnets are widely used especially in traction applications as a result of their higher efficiency and torque density in comparison with other electrical motors. Due to price fluctuations and limited production of rare-earth materials, it is essential to find alternatives to the rare-earth PMSMs for different applications. This thesis focuses on the application of Aluminum-Nickel-Cobalt (AlNiCo) magnets in PMSMs. AlNiCo magnets can theoretically provide torque densities comparable to rare-earth magnets in electrical machines. The application of AlNiCo magnets in electrical machines can improve the field-weakening performance, due to the possibility of varying their magnetic flux density using armature current pulses. As a result, these machines are named variable flux machines (VFMs). This thesis presents an analytical model for the VFM to calculate the no-load air gap flux density and consequently, the no-load back-EMF, torque peak to peak value, average torque, and magnetization current. The proposed model is used to develop an analytical design criterion for spoke type AlNiCo-based VFMs. An experimental characterization of an existing spoke type VFM at different magnetization levels is done of the torque waveform, the torque-angle characteristics, the no-load back-EMF and the magnetization/demagnetization energy. An optimization procedure to reduce the torque ripple and the magnetization current of the spoke type AlNiCo-based VFM is then proposed. A new VFM design with radially magnetized interior magnets is presented to enhance the torque density in the field-weakening operating condition. The torque-speed and power-speed characteristics of the VFM are calculated considering the demagnetization of the AlNiCo magnets in the field-weakening region. The proposed design keeps the fully magnetized condition at both no-load and full-load conditions and provides high power densities at a wider speed range. This design is also optimized to have reduced torque ripple. An improved core loss model is proposed and implemented in the finite element software, and an experimental method based on the flux controllability of the VFM is developed to measure the mechanical and core losses at the no-load condition. These results are then used to verify the proposed core loss model.
Author: Jacek F. Gieras
Publisher: Springer Science & Business Media
ISBN: 1402082274
Category : Technology & Engineering
Languages : en
Pages : 365
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Book Description
Axial Flux Permanent Magnet (AFPM) brushless machines are modern electrical machines with a lot of advantages over their conventional counterparts. This timeless and revised second edition deals with the analysis, construction, design, control and applications of AFPM machines. The authors present their own research results, as well as significant research contributions made by others.
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: Alejandro Jose Pina Ortega
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The use of soft and hard magnetic materials in the construction of electric machines has become a common practice. However, demand for machines with higher power density and efficiency sets new challenges; new machines require non-conventional geometries, materials with higher energy densities, higher operating temperatures and reliable mechanisms of control. The Permanent Magnet Synchronous Machine (PMSM) is one of the key enabling technologies that have been subject of investigation in the past few decades because it can outperform other types of electric machines in a broad range of applications. In the manufacturing of high power density PMSMs, even small manufacturing variations can impact heavily on their performance. The tolerances and imperfections lead to physical machine asymmetries, and this work deals with the modeling and analysis of these asymmetries. It is noteworthy that asymmetries can also be introduced in the machine intentionally to enhance the functionality in certain cases. By means of electromagnetic field theory, analytic models have been developed in this study; Also, numerical analysis on the basis of Finite Element Method (FEM) have been extensively used throughout this work with the aim to validate the results and further investigate the non-linear nature of materials. Prototypes of Surface-Mounted Permanent Magnet (SPM) machines, Interior Permanent Magnet (IPM) machines and Synchronous Reluctance Machines assisted Permanent Magnets (PMaSynRM) were built and tested to verify the validity of the proposed models under loaded and unloaded conditions. The results provided by the analytic models were considerably more time-efficient without compromising accuracy when compared to those of FE-based models, even when the geometries do not match perfectly owing to the limitations of solving the model in polar coordinates. %Discrepancies were found only when the machine goes beyond the linear region due to the assumption of infinite permeability in the analytic model. The analysis of radial forces showed that new vibration modes occur due to unbalanced radial pressure, which then introduce new resonance frequencies. Additionally, a geometry optimized to minimize torque ripple through controlled-asymmetry compensates harmonics in torque efficiently, but such compensation does not occur in the same manner on radial forces. The results suggest that neglecting the tolerances in the analysis might underestimate the resultant torque ripple by as much as 75\%. On the other hand, when appropriately using controlled-asymmetries, up to 90\% of reduction in the amplitude of torque pulsations are achieved. Furthermore, the effect of tolerances can be mitigated in introducing controlled-asymmetries since both cases produce similar harmonic orders in tangential and radial forces.
Author: Ping Zhou
Publisher:
ISBN:
Category : Electric motors, Synchronous
Languages : en
Pages : 348
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Book Description
Author: Ahamed Bilal Asaf Ali
Publisher: Cuvillier
ISBN: 9783954047703
Category : Electric motors, Synchronous
Languages : en
Pages : 196
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Book Description
This thesis presents the generic rules for permanent magnet synchronous machine (PMSM) with tooth coil winding arrangement. The generic rules concentrates on minimized cogging torque and torque ripple. The geometries considered in this thesis are two different tooth coil winding arrangements and three different rotor types to formulate the design rules. The occurrence of parasitic torque in the PMSM is classified from the origin of harmonic sources. The cogging torque and torque ripple are derived analytically using the stator current sheet distribution, the rotor field distribution and the permeance functions. The detailed torque analysis are performed in Finite Element Method (FEM) for different slot opening and magnet pole coverage. The 2D harmonics analysis approach is used to predict the sources of the harmonics. The torque is reconstructed from the selected harmonics combinations and are compared with the pulsating torque obtained directly from the FEM. The harmonic sources of pulsating torque are also validated with prototype for a geometry. The investigations on pulsating torque are extended to other operating points such as field weakening and half load condition. Finally, the generic design rules are suggested for PMSM with tooth coil winding arrangement. In addition, simplified design rules to have quick design approach and design guidelines from manufacturing point of view are suggested.
