Capacitive Power Transfer Field Excitation with an Integrated Resolver for Synchronous Machines PDF Download
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Author: Marisa Jean Tisler Liben
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Permanent magnet synchronous machines currently dominate traction motor applications such aselectric vehicles. However, wound field synchronous machines offer a comparable alternative in terms of performance and efficiency without the unpredictable prices and high carbon emissions of mining and manufacturing permanent magnets. These machines are ubiquitous at megawatt levels, especially in power plants, but require high-performance, low-cost excitation systems in order to be attractive as traction motors. This work continues research into capacitive power transfer (CPT) as a suitable wireless excitation method for wound field synchronous machines. Here, a capacitive power transfer system is scaled beyond previous work to achieve a > 3X increase in power transfer over previous work by increasing the frequency to > 6.78MHz. A peak output power of 2.3kW at a DCDC efficiency of 88.5% is reached in this system. The system features a minimal part count series tank resonant topology with the inverter redesigned for megahertz level operation with special consideration for stray inductance verified in Ansys Q3D FEA. Likewise, the coupler structure's rectifier is updated to reduce the total parts count by half and handle kilowatt output power with a current-stiff rectifier. The current stiff rectifier features a large DC filter inductor on the output to maintain continuous conduction operation of the diodes. Using SiC Schottky diodes the rectifier has superior performance over conventional voltage-stiff rectifiers to achieve the 2.3kW output power to the load. Additionally, a capacitive resolver is developed to be integrated around the rotating rectifier ofany wireless exciter and also around the CPT coupler boards. This solution reduces the machine cost for traction applications by removing the cost of an external rotor position sensor. The capacitive resolver is made to be a drop-in replacement for conventional magnetic resolvers and compatible with their existing demodulation strategies. The general integrated resolver and rectifier is tested with a digital demodulation kit, AD2S1210 from Analog Devices, and achieves a maximum angle error of 0.3 degrees. The carrier excitation frequency is 20kHz as is standard for magnetic resolvers. For the CPT-integrated resolver and rectifier, the excitation frequency is > 6.78MHz and demodulation with an analog multiplier is used instead. A maximum rotor angle error of 10 degrees is achieved. Overall, the integrated capacitive resolver and rectifier provides an additional pathway to reduce the wound field synchronous machine system cost for adoption in traction applications.
Author: Marisa Jean Tisler Liben
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Permanent magnet synchronous machines currently dominate traction motor applications such aselectric vehicles. However, wound field synchronous machines offer a comparable alternative in terms of performance and efficiency without the unpredictable prices and high carbon emissions of mining and manufacturing permanent magnets. These machines are ubiquitous at megawatt levels, especially in power plants, but require high-performance, low-cost excitation systems in order to be attractive as traction motors. This work continues research into capacitive power transfer (CPT) as a suitable wireless excitation method for wound field synchronous machines. Here, a capacitive power transfer system is scaled beyond previous work to achieve a > 3X increase in power transfer over previous work by increasing the frequency to > 6.78MHz. A peak output power of 2.3kW at a DCDC efficiency of 88.5% is reached in this system. The system features a minimal part count series tank resonant topology with the inverter redesigned for megahertz level operation with special consideration for stray inductance verified in Ansys Q3D FEA. Likewise, the coupler structure's rectifier is updated to reduce the total parts count by half and handle kilowatt output power with a current-stiff rectifier. The current stiff rectifier features a large DC filter inductor on the output to maintain continuous conduction operation of the diodes. Using SiC Schottky diodes the rectifier has superior performance over conventional voltage-stiff rectifiers to achieve the 2.3kW output power to the load. Additionally, a capacitive resolver is developed to be integrated around the rotating rectifier ofany wireless exciter and also around the CPT coupler boards. This solution reduces the machine cost for traction applications by removing the cost of an external rotor position sensor. The capacitive resolver is made to be a drop-in replacement for conventional magnetic resolvers and compatible with their existing demodulation strategies. The general integrated resolver and rectifier is tested with a digital demodulation kit, AD2S1210 from Analog Devices, and achieves a maximum angle error of 0.3 degrees. The carrier excitation frequency is 20kHz as is standard for magnetic resolvers. For the CPT-integrated resolver and rectifier, the excitation frequency is > 6.78MHz and demodulation with an analog multiplier is used instead. A maximum rotor angle error of 10 degrees is achieved. Overall, the integrated capacitive resolver and rectifier provides an additional pathway to reduce the wound field synchronous machine system cost for adoption in traction applications.
Author: Skyler Steven Hagen
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Book Description
With the current proliferation of electric machines taking over roles that were historically performed by mechanical transmissions and combustion engines, strides are being taken to make electric machines more power and torque dense, as well as less expensive. The wound field synchronous machine (WFSM) has advantages in power density, controllability, as well as cost of manufacturing, over other types including induction machines and permanent magnet synchronous machines. Its use for vehicle and traction applications has been limited due to the requirement of electrical power on the rotor field windings throughout the machine's entire range of speed, including stall. Field excitation requirements at stall and low speeds prohibit the use of conventional brushless exciters, commonly used in gen-sets, which rely on shaft rotation and torque to produce field current. Gapped rotating electromagnetic transformers allow excitation at stall but suffer from complexity of manufacturing and added volume to accommodate the ferrous core materials required to complete a magnetic circuit. All contactless field excitation methods require a rotating rectifier diode board or assembly to be installed on the rotor, alongside the brushless exciter or rotating transformer, in order to provide direct current to the field winding, from a contactless power coupler which is inherently alternating current. Capacitive power transfer (CPT) has been shown to be competitive with inductive power transfer in supplying full field excitation to wound rotor synchronous machines. In this thesis, a capacitive power transfer system is described in which the rotating rectifier board, manufactured using conventional printed circuit board techniques, dual-purposes as the capacitive power coupling structure, resulting in an efficient, low cost and compact means for transferring kilowatt scale electrical power to a wound field synchronous machine. A design process for the capacitive coupler itself in conjunction with necessary passive components and controls is laid out, and experimental results are given for a CPT system being used to provide full field excitation to a 55kW WFSM.
Author: Ryan Patrick Knippel
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
A survey of rotary power conversion systems based on electrostatics shows favorable features in materials and manufacturing, but they lag the gap power density of electromagnetic approaches by orders of magnitude. Rather than trying to match the air gap power density of electromagnetics, this work pursues modes of maximizing the capacitive surface area while minimizing the dielectric gap present in electrostatically coupled systems. Utilizing hydrodynamic bearing structures integrated into the surface of the rotating capacitors, the dielectric gap may be maintained at distances approaching tens of microns over tens of centimeters up to speeds exceeding 30,000 rotations per minute. This approach eliminates the longstanding air gap field impediment to electrostatic systems by increasing volumetric power density. The ability of this mechanical approach to enable capacitively coupled system is demonstrated in two areas of power conversion, wireless power transfer and an electric machine platform. The wireless power transfer portion of this research culminates the design and implementation of a system of axially stacked rotating capacitors for wireless power transfer, known as a capacitive power coupler (CPC). This device delivered 700 W at 6.5 amps of excitation to the field coils of an 80 kW wound field synchronous machine. 6 stator and 5 rotor discs offset by 115 microns comprised each of the two 2.8 nF coupling capacitors, yielding a total capacitor length of 4.98 mm. This design achieved a gap/rotor diameter aspect ratio previously attained only in the MEMs community, opening the way for the development of a macroscale electrostatic mechanical platform. An axial flux PCB based electrostatic induction machine (ESIM) platform utilizing the principles of operation of, and tools resulting from the capacitive coupler was constricted. Structural models based on tensile tests of FR4 were developed to predict safe operation spaces of the ESIM. The final ESIM platform maintains an axial air gap of 57 microns across its 170 mm diameter rotor face (a 1:1500 aspect ratio) and delivers 2.4 W of mechanical power per facing pair of rotor and stator discs. This proof of concept machine provides the first strong mechanical base for future electrical optimization of these machines.
Author:
Publisher:
ISBN:
Category : Power transmission
Languages : en
Pages : 544
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Author:
Publisher:
ISBN:
Category : Power transmission
Languages : en
Pages : 1822
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Author:
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 980
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Author: Peter W. Sauer
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
For a one-semester senior or beginning graduate level course in power system dynamics. This text begins with the fundamental laws for basic devices and systems in a mathematical modeling context. It includes systematic derivations of standard synchronous machine models with their fundamental controls. These individual models are interconnected for system analysis and simulation. Singular perturbation is used to derive and explain reduced-order models.
Author: P. C. Sen
Publisher: New York ; Toronto : J. Wiley
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 648
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Book Description
This new edition combines the traditional areas of electric machinery with the latest in modern control and power electronics. It includes coverage of multi-machine systems, brushless motors and switched reluctance motors, as well as constant flux and constant current operation of induction motors. It also features additional material on new solid state devices such as Insulated Gate Bipolar Transistors and MOS-Controlled Thrysistors.
Author: Theodore Wildi
Publisher: Pearson Educación
ISBN: 9789702608141
Category : Technology & Engineering
Languages : en
Pages : 966
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Book Description
The HVDC Light[trademark] method of transmitting electric power. Introduces students to an important new way of carrying power to remote locations. Revised, reformatted Instructor's Manual. Provides instructors with a tool that is much easier to read. Clear, practical approach.
Author: Marius Rosu
Publisher: John Wiley & Sons
ISBN: 1119103444
Category : Science
Languages : en
Pages : 312
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Book Description
Presents applied theory and advanced simulation techniques for electric machines and drives This book combines the knowledge of experts from both academia and the software industry to present theories of multiphysics simulation by design for electrical machines, power electronics, and drives. The comprehensive design approach described within supports new applications required by technologies sustaining high drive efficiency. The highlighted framework considers the electric machine at the heart of the entire electric drive. The book also emphasizes the simulation by design concept—a concept that frames the entire highlighted design methodology, which is described and illustrated by various advanced simulation technologies. Multiphysics Simulation by Design for Electrical Machines, Power Electronics and Drives begins with the basics of electrical machine design and manufacturing tolerances. It also discusses fundamental aspects of the state of the art design process and includes examples from industrial practice. It explains FEM-based analysis techniques for electrical machine design—providing details on how it can be employed in ANSYS Maxwell software. In addition, the book covers advanced magnetic material modeling capabilities employed in numerical computation; thermal analysis; automated optimization for electric machines; and power electronics and drive systems. This valuable resource: Delivers the multi-physics know-how based on practical electric machine design methodologies Provides an extensive overview of electric machine design optimization and its integration with power electronics and drives Incorporates case studies from industrial practice and research and development projects Multiphysics Simulation by Design for Electrical Machines, Power Electronics and Drives is an incredibly helpful book for design engineers, application and system engineers, and technical professionals. It will also benefit graduate engineering students with a strong interest in electric machines and drives.
