Operation of an Electrical Excited Synchronous Machine by Contactless Energy Transfer to the Rotor
09 Mar 2018-IEEE Transactions on Industry Applications (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 54, Iss: 4, pp 3217-3225
TL;DR: In this article, a rotating contactless energy transfer (CET) system consisting of the power electronics, the compensation network, the magnetic path, the control system, and the electrical excited synchronous machine with controller is presented.
Abstract: This paper deals with the design, the setup, and the operation of a rotating contactless energy transfer (CET) system. The system is used to replace the slip rings of an electrical excited synchronous machine and to transfer energy onto the rotor of the machine without mechanical contact. A compensation topology with an autoresonant circuit to generate the high frequency voltage is presented. Furthermore, the required parameters of the CET system are calculated. Based on these calculations, the system consisting of the power electronics, the compensation network, the magnetic path, the control system, and the electrical excited synchronous machine with controller, is set up. Finally, the calculated parameters are verified by measurements.
Citations
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01 Sep 2016
TL;DR: In this article, the design, the set-up and the operation of a rotating contactless energy transfer system was discussed, where the system was used to replace the slip rings of an electrical excited synchronous machine and transfer energy contactless on the rotor of the machine.
Abstract: This paper deals with the design, the set-up and the operation of a rotating contactless energy transfer system. The system is used to replace the slip rings of an electrical excited synchronous machine and transfer energy contactless on the rotor of the machine. Considering the application and the involved boundary conditions, the optimal topology of the compensation network and the optimal operation range is chosen. Furthermore, the required parameters of the contactless energy transfer system are calculated. Based on these calculations the system, consisting of the power electronics, the compensation network, the magnetic path and the control system, is set up. Finally, the calculations are verified by measurements.
17 citations
Cites methods from "Operation of an Electrical Excited ..."
...Compared to the 1s2p prototype, presented in [20], the dimensions of the active part of the energy transfer system could be reduced by about half....
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...Using a CET system instead of slip rings to operate an electrical excited synchronous machine (iEESM) implies some differences compared to well established applications, like battery charging or voltage stable power supply [19], [20]....
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...The setup, calculation, and measurements of the 1s2p-system with a half-bridge inverter is already presented in [20]....
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...The equivalent circuit for the 1s2p-system is shown in [20]....
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...The 1s2p-system is already calculated, set up, and tested in [20]....
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21 Sep 2020
TL;DR: The most common topologies of rotary transformers for wireless power transfer (WPT) will be presented and the recommendations for the rotary transformer design will be provided.
Abstract: In this article, the most common topologies of rotary transformers for wireless power transfer (WPT) will be presented. Their main advantages, disadvantages and applications will be discussed. The methodology for modeling of rotary transformers for wireless excitation of the electrically excited synchronous machines will be especially emphasized. Based on the literature review and the results obtained in the present study the recommendations for the rotary transformer design will be provided.
12 citations
TL;DR: In this article , the authors proposed a robust maximum torque per ampere (MTPA) control strategy based on a series of new sliding mode (SM) inductance observers.
Abstract: Wound field synchronous motors (WFSMs) without installing slip rings and brushes are drawing increasing attention in the electric vehicle (EV) propulsion systems. To ensure high control performance of the EV-WFSMs, this article proposes a robust maximum torque per ampere (MTPA) control strategy based on a series of new sliding mode (SM) inductance observers. First, after establishing the model of a WFSM based on capacitive coupling, the current control scheme is designed for the MTPA control. Second, to eliminate the impacts of the inductance uncertainties on the MTPA control, the SM mutual inductance observer, q-axis inductance observer, and d-axis inductance observer are designed, which need to be implemented one by one. Then, the Lyapunov stability criterion is used to analyze the stability conditions for the observers. Moreover, considering that the observers are achieved by using the offline inductance information provided by the suppliers, the robustness against parameter mismatch is innovatively discussed at length, and an analytical method that can avoid estimation errors is developed. The proposed inductance identification techniques and MTPA control method are verified by both simulation and experiments, which are conducted on a 580-W three-phase WFSM drive.
10 citations
TL;DR: In this paper, the optimal design and comparative analysis of resonant and non-resonant high-frequency GaN-based rotating transformers is discussed. And the results of both design optimizations have shown large improvements in terms of output power and core inertia as a result of applying series-series resonant compensation.
Abstract: This paper concerns the optimal design and comparative analysis of resonant and non-resonant high-frequency GaN-based rotating transformers. A multi-physical design approach is employed, in which magnetic, electrical, and thermal models are coupled. The results are verified by experiments. Two different optimization objectives are considered; firstly, the efficiency of two standard core geometries is maximized for a required output power level. Secondly, a geometrical optimization is performed, such that the core inertia is minimized for the desired output power level. The results of both design optimizations have shown large improvements in terms of output power and core inertia as a result of applying series–series resonant compensation.
6 citations
Cites background from "Operation of an Electrical Excited ..."
..., in battery charging and robotic applications [1,2], as well as an alternative to slip rings or brushes in electric machines [3,4]....
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TL;DR: In this article , a contactless power transfer device using wireless power transfer (WPT) is designed, and its performances are simulated by finite-element method, where high-frequency ferromagnetic materials and Litz wires are used.
Abstract: In traditional applications such as machine field excitation, where power transfer from stationary to rotary side is needed, contact slip rings are often adopted. However, this kind of slip ring is easy to wear and needs frequent maintenance. In a contactless power transfer system, mechanical slip rings can be removed which will largely increase the system reliability. In this article, a contactless power transfer device using wireless power transfer (WPT) is designed. Its performances are simulated by finite-element method. To increase the system power rate and efficiency, the device is operated under high frequency. Thus, high-frequency ferromagnetic materials and Litz wires are used. Moreover, compensation circuits are added to improve the coupling between the primary and secondary sides. At last, a prototype is built and tested. From the experimental results, the functions and performances of the device are well verified.
6 citations
References
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TL;DR: In this paper, the half-bridge series-resonant, parallel-reonant and combination series-parallel resonant converters are compared for low-output-voltage power supply applications.
Abstract: The half-bridge series-resonant, parallel-resonant, and combination series-parallel resonant converters are compared for use in low-output-voltage power supply applications. It is shown that the combination series-parallel converter, which takes on the desirable characteristics of the pure series and the pure parallel converter, avoids the main disadvantages of each of them. Analyses and breadboard results show that the combination converter can run over a large input voltage range and a large load range (no load to full load) while maintaining excellent efficiency. A useful analysis technique based on classical AC complex analysis is introduced. >
1,795 citations
TL;DR: In this paper, the authors reviewed the technologies in the wireless power transfer (WPT) area applicable to electric vehicle (EV) wireless charging, and the obstacles of charging time, range, and cost can be easily mitigated.
Abstract: Wireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires. In fact, the WPT adopts the same basic theory which has already been developed for at least 30 years with the term inductive power transfer. WPT technology is developing rapidly in recent years. At kilowatts power level, the transfer distance increases from several millimeters to several hundred millimeters with a grid to load efficiency above 90%. The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios. This paper reviewed the technologies in the WPT area applicable to EV wireless charging. By introducing WPT in EVs, the obstacles of charging time, range, and cost can be easily mitigated. Battery technology is no longer relevant in the mass market penetration of EVs. It is hoped that researchers could be encouraged by the state-of-the-art achievements, and push forward the further development of WPT as well as the expansion of EV.
1,603 citations
02 Mar 1987
TL;DR: In this paper, the half-bridge series resonant, parallel resonant and combination series-parallel resonant converters are compared for use in low output voltage power supply applications, and it is shown that the combination seriesparallel converter, which takes on the desirable characteristics of the pure series and the pure parallel converters, removes the main disadvantages of those two converters.
Abstract: The half-bridge series resonant, parallel resonant and combination series-parallel resonant converters are compared for use in low output voltage power supply applications. It is shown that the combination series-parallel converter, which takes on the desirable characteristics of the pure series and the pure parallel converter, removes the main disadvantages of those two converters. Analyses and breadboard results show that the combination series-parallel converter can run over a large input voltage range and a large load range (no-load to full-load) while while maintaining excellent efficiency. A useful analysis technique based on classical ac complex analysis is also introduced.
860 citations
TL;DR: This paper reviews and addresses the research work that has been carried out to reduce the amount of rare-earth material that is used while maintaining the high efficiency and performance that rare- earth PM machines offer.
Abstract: Hybrid and electric vehicle technology has seen rapid development in recent years. The motor and the generator are at the heart of the vehicle drive and energy system and often utilize expensive rare-earth permanent magnet (PM) material. This paper reviews and addresses the research work that has been carried out to reduce the amount of rare-earth material that is used while maintaining the high efficiency and performance that rare-earth PM machines offer. These new machines can use either less rare-earth PM material, weaker ferrite magnets, or no magnets; and they need to meet the high performance that the more usual interior PM synchronous motor with sintered neodymium-iron-boron magnets provides. These machines can take the form of PM-assisted synchronous reluctance machines, induction machines, switched reluctance machines, wound rotor synchronous machines (claw pole or biaxially excited), double-saliency machines with ac or dc stator current control, or brushless dc multiple-phase reluctance machines.
653 citations
"Operation of an Electrical Excited ..." refers background in this paper
...A reasonable alternative to these machines are electrical excited synchronous machines, which use electromagnets to generate the rotor flux and offer a constant power operation over a wide speed range, by field weakening [2]–[5]....
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TL;DR: In this paper, the authors describe the optimization of inductive power transfer (IPT) coil systems with respect to efficiency and area-related power density as required in electric vehicle applications.
Abstract: This paper details the optimization of inductive power transfer (IPT) coil systems with respect to efficiency $\eta $ and area-related power density $\alpha $ as required in electric vehicle applications. Based on analytical calculations and finite-element models, which are discussed and experimentally verified in detail, generally valid design guidelines for high-power IPT systems are derived, and the $\eta $ - $\alpha $ -Pareto optimization of a scaled 5kW prototype system is presented. Experiments demonstrate a dc-to-dc conversion efficiency of more than 96.5% at a power density of 1.47kW/dm $^{2}$ with coils of 210mm diameter/52mm air gap, including the losses in the resonant capacitors and the power converter. Field measurements validate the predicted stray field with a calculation error of less than 10%.
285 citations
"Operation of an Electrical Excited ..." refers background or methods in this paper
...For the described CETsystem with a secondary side parallel compensation, a full-wave rectifier with the following transmission ratio is established [18]:...
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...Nevertheless, CET is still an important field of research [16]–[18]....
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