Low Pole Axial Flux-switching Permanent Magnet Machines with Even Harmonic Elimination Capability PDF Download
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Author: Ju Hyung Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This thesis proposes topologies of axial flux-switching permanent magnet (AxFSPM) machines having a 6-slot/4-pole configuration. Different from other high-pole topologies, the proposed topologies achieve the capability of even harmonics elimination taking advantages of a dual structure of AxFSPM machine. The dual structure AxFSPM machine includes a dual-rotor single-stator (DRSS) and a dual-stator single-rotor (DSSR) AxFSPM machines. Other cascaded versions are possible. Significant attention is devoted to developing several alternative approaches to reducing the number of rotor poles. Theory of eliminating even harmonics of the flux linkage is presented introducing a new concept of a stator and a rotor shifting to find the offset angle between stator and rotor pole. Furthermore, this thesis presents technical details of the proposed topologies, including sizing equations of the AxFSPM machine, scalability of the sizing equation, topology comparison, cogging torque elimination methods, manufacturing tolerance issue, demagnetization, and structural dynamics of AxFSPM machines. For the initial design of the proposed topology, sizing equations are derived considering the PM dimension and the magnetic flux. The sizing equations are also verified with finite element analysis (FEA) and prototyping to generalize the scalability of the AxFSPM machine. The characteristics of the proposed topologies are investigated with FEA supported by experimental results. Topologies are compared for dual-structure AxFSPM machines as well as dual-rotor single stator axial flux surface PM (AxSPM) machine. Various rotor tooth shaping methods are proposed and compared using FEA to reduce the cogging torque and ripple torque maintaining average torque. Manufacturing tolerance of AxFSPM machine is considered and investigated to quantify the effect of flaws in the manufacturing process. Demagnetization is investigated to provide an understanding of problems of PMs in the stator. Structure dynamics are also considered understanding the effect of dual-structure in AxFSPM machines. Through proof of concept machine, this thesis proves that the proposed topologies physically can be realized in AxFSPM machine. The proof of concept machine also verifies that dual structure is beneficial to eliminate the even harmonics in 6-slot/4-pole AxFPSM machine.
Author: Ju Hyung Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This thesis proposes topologies of axial flux-switching permanent magnet (AxFSPM) machines having a 6-slot/4-pole configuration. Different from other high-pole topologies, the proposed topologies achieve the capability of even harmonics elimination taking advantages of a dual structure of AxFSPM machine. The dual structure AxFSPM machine includes a dual-rotor single-stator (DRSS) and a dual-stator single-rotor (DSSR) AxFSPM machines. Other cascaded versions are possible. Significant attention is devoted to developing several alternative approaches to reducing the number of rotor poles. Theory of eliminating even harmonics of the flux linkage is presented introducing a new concept of a stator and a rotor shifting to find the offset angle between stator and rotor pole. Furthermore, this thesis presents technical details of the proposed topologies, including sizing equations of the AxFSPM machine, scalability of the sizing equation, topology comparison, cogging torque elimination methods, manufacturing tolerance issue, demagnetization, and structural dynamics of AxFSPM machines. For the initial design of the proposed topology, sizing equations are derived considering the PM dimension and the magnetic flux. The sizing equations are also verified with finite element analysis (FEA) and prototyping to generalize the scalability of the AxFSPM machine. The characteristics of the proposed topologies are investigated with FEA supported by experimental results. Topologies are compared for dual-structure AxFSPM machines as well as dual-rotor single stator axial flux surface PM (AxSPM) machine. Various rotor tooth shaping methods are proposed and compared using FEA to reduce the cogging torque and ripple torque maintaining average torque. Manufacturing tolerance of AxFSPM machine is considered and investigated to quantify the effect of flaws in the manufacturing process. Demagnetization is investigated to provide an understanding of problems of PMs in the stator. Structure dynamics are also considered understanding the effect of dual-structure in AxFSPM machines. Through proof of concept machine, this thesis proves that the proposed topologies physically can be realized in AxFSPM machine. The proof of concept machine also verifies that dual structure is beneficial to eliminate the even harmonics in 6-slot/4-pole AxFPSM machine.
Author: Yingjie Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 734
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Book Description
The purpose of this research is to investigate a novel family of flux-switching permanent magnet (FSPM) machines that have a low number of rotor poles. The low-pole topology is favorable for the medium to high-speed operation to minimize fundamental frequency requirement and associated losses. The conventional six stator slots and four rotor poles (6/4) FSPM machine has inherent large harmonic distortion in the flux linkage and severe cogging torque. The proposed flux-coupling dual-stator structure eliminates the even order harmonics in the flux linkage. Harmonic distortion and cogging torque are notably reduced in the proposed machine. The principle of operation, design methodologies, sizing equations, and multiple alternative topologies are investigated for the proposed dual-stator 6/4 FSPM machine. The performance of proposed machine is compared to 12/10 FSPM machine to show benefits of reduced losses and improved efficiency. Various scalable designs are compared and the principle of scalability is summarized. Torque ripple reduction techniques including rotor pole shaping and step skew are implemented. Mechanical tolerance analysis including deviation of offset angle, rotor static and dynamic eccentricities are presented to show the importance of tolerance control. Rotor dynamic properties such as natural frequencies and vibration modes are studied for the medium-speed machine. Structural stress distribution is evaluated to show the machine operates at safe margin within material strength. Dynamometer experimental tests are performed to validate the performance of the proposed machine.
Author: Jacek F. Gieras
Publisher: Springer Science & Business Media
ISBN: 9781402026614
Category : Technology & Engineering
Languages : en
Pages : 360
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Book Description
Axial Flux Permanent Magnet (AFPM) brushless machines are modern electrical machines with a lot of advantageous merits over their conventional counterparts. They are increasingly used in power generation, domestic appliances, industrial drives, electric vehicles, and marine propulsion drives and many other applications. This book deals with the analysis, construction, design, optimisation, control and applications of AFPM machines. The authors present their own research results, as well as significant research contributions made by others. This monograph will be of interest to electrical engineers and other engineers involved in the design and application of AFPM brushless machine drives. It will be an important resource for researchers and graduate students in the field of electrical machine and drives.
Author: Mingda Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Permanent magnet (PM) electric machines have been widely used in many applications because of the high power density and efficiency. Several topologies of PM machine have been proposed and investigated, and each topology has its own features and advantages. Flux-switching permanent magnet (FSPM) machine has been widely investigated in the past few decades because of many unique properties such as robust rotor structure and easy thermal management. Low-pole FSPM machine such as 6/4 FSPM machine is attractive for high-speed applications because of the low fundamental frequency, which is beneficial to reduce iron loss and inverter switching loss. However, the existing double-layer concentrated winding dual-stator 6/4 FSPM machine has potential issues such as large second-order harmonic and low winding factor. The purpose of this research is to further investigate the design of the 6/4 FSPM machine and to make it a competitive candidate for real-world applications. The proposed dual-stator 6/4 FSPM machine with single-layer winding is shown to be able to increase the winding factor from 0.5 to 1 and to achieve high efficiency. Analytical model and finite element analysis (FEA) models are established to compare the performance of the proposed and the existing 6/4 FSPM machine. Having both permanent magnet and armature winding in the stator allows the FSPM machine to be easily cooled by water jacket which locates outside the stator. One the other hand, the temperature-sensitive permanent magnets are in the stator assembly and located close to the major heat sources. Therefore, careful thermal analysis on the FSPM machine is needed to guarantee the machine sanity. Lumped-parameter thermal network (LPTN) model and thermal FEA model are built to estimate the machine steady-state and transient thermal performance. It is shown that the winding layout and the use of winding encapsulation play an important role in the thermal performance of the FSPM machine. Windage loss and housing eddy current loss is more prominent in the FSPM machine compared to the surface PM machine and interior PM machine due to the salient rotor pole and stator-mounted permanent magnet. This research investigates the windage and housing loss of the FSPM machine and proposes modified machine structures to mitigate the windage loss and housing loss. Prototype 6/4 FSPM motors are built and tested on the dynamometer test bench. Good agreement is found between the measured data and the machine performance predicted by the analytical calculation and FEA simulation.
Author: Asko Parviainen
Publisher:
ISBN: 9789522140302
Category :
Languages : en
Pages : 153
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Book Description
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: D.J. Littler
Publisher: Elsevier
ISBN: 1483287483
Category : Technology & Engineering
Languages : en
Pages : 599
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Book Description
The introduction of new 500 MW and 660 MW turbine generator plant in nuclear, coal- and oil-fired power stations has been partly responsible for the increase in generating capacity of the CEGB over the last 30 years. This volume provides a detailed account of experience gained in the development, design, manufacture, operation and testing of large turbine-generators in the last 20 years. With the advance in analytical and computational techniques, the application of this experience to future design and operation of large turbine-generator plant will be of great value to engineers in the industry.
Author: IEEE Staff
Publisher:
ISBN: 9781728129075
Category :
Languages : en
Pages :
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Book Description
The symposium is intended as an international forum where an effective exchange of knowledge and experience amongst researchers active in various theoretical and applied areas of electrical and electronics engineering, power electronics and telecommunications, control systems and computational intelligence can take place The objective of the fourth symposium is oriented but not limited to the paradigm of interdependency between electrical and electronic systems The symposium will provide presentations on the latest trends, in depth knowledge about achieving the highest level of technology in the field The event will also provide a variety of workshops, discussions, and exhibitions to fully immerse the attendees in the Symposium pleasant atmosphere
Author: Juha Pyrhonen
Publisher: John Wiley & Sons
ISBN: 1118701658
Category : Technology & Engineering
Languages : en
Pages : 612
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Book Description
In one complete volume, this essential reference presents an in-depth overview of the theoretical principles and techniques of electrical machine design. This timely new edition offers up-to-date theory and guidelines for the design of electrical machines, taking into account recent advances in permanent magnet machines as well as synchronous reluctance machines. New coverage includes: Brand new material on the ecological impact of the motors, covering the eco-design principles of rotating electrical machines An expanded section on the design of permanent magnet synchronous machines, now reporting on the design of tooth-coil, high-torque permanent magnet machines and their properties Large updates and new material on synchronous reluctance machines, air-gap inductance, losses in and resistivity of permanent magnets (PM), operating point of loaded PM circuit, PM machine design, and minimizing the losses in electrical machines> End-of-chapter exercises and new direct design examples with methods and solutions to real design problems> A supplementary website hosts two machine design examples created with MATHCAD: rotor surface magnet permanent magnet machine and squirrel cage induction machine calculations. Also a MATLAB code for optimizing the design of an induction motor is provided Outlining a step-by-step sequence of machine design, this book enables electrical machine designers to design rotating electrical machines. With a thorough treatment of all existing and emerging technologies in the field, it is a useful manual for professionals working in the diagnosis of electrical machines and drives. A rigorous introduction to the theoretical principles and techniques makes the book invaluable to senior electrical engineering students, postgraduates, researchers and university lecturers involved in electrical drives technology and electromechanical energy conversion.
Author: Rui Araújo
Publisher: BoD – Books on Demand
ISBN: 1789844541
Category : Science
Languages : en
Pages : 373
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Book Description
Today, switched reluctance machines (SRMs) play an increasingly important role in various sectors due to advantages such as robustness, simplicity of construction, low cost, insensitivity to high temperatures, and high fault tolerance. They are frequently used in fields such as aeronautics, electric and hybrid vehicles, and wind power generation. This book is a comprehensive resource on the design, modeling, and control of SRMs with methods that demonstrate their good performance as motors and generators.
