Pub Date : 2024-11-12DOI: 10.1109/TASC.2024.3491418
Brian J. Vaughn
Radio Frequency superconductivity has been a mainstay of accelerator science for decades. However, its benefits have yet to be applied to proton synchrotrons with demanding tuning requirements. For example, the Main Injector (MI), Fermilab's high-energy proton synchrotron, currently utilizes 20+ ferrite-loaded cavities for a targeted 1.2 s acceleration cycle. Harnessing the extremely high gradients associated with superconductivity, the required number of cavities could be reduced by an order of magnitude, dramatically lowering operational power requirements even with cryogenic considerations. Additionally, the current plans for the Fermilab accelerator complex evolution initiative involve almost doubling the number of cavities in MI if the same designs are to be used, further highlighting the potential benefits of superconductivity. These advantages are attractive, but to date, no tunable superconducting cavity suitable for MI has been proposed due to the incompatibility of conventional broadband tuning methods with superconductivity. Here, we present a tunable superconducting cavity concept capable of record-breaking performance. Tuning will be accomplished by using high-speed linear actuators to vary the insertion depth of metallic plungers into the cavity volume. This tuning concept is theoretically viable with currently available technology and will be fully compatible with a superconducting cavity.
几十年来，射频超导一直是加速器科学的支柱。然而，它的优势尚未应用于对调谐要求苛刻的质子同步加速器。例如，费米实验室的高能质子同步加速器 "主注入器"（MI）目前使用 20 多个铁氧体空腔来实现 1.2 秒的目标加速周期。利用与超导相关的极高梯度，所需的空腔数量可以减少一个数量级，即使考虑到低温因素，也能显著降低运行功率要求。此外，费米实验室加速器综合体进化计划的当前计划涉及，如果使用相同的设计，MI 中的空腔数量将增加几乎一倍，这进一步凸显了超导的潜在优势。这些优势非常吸引人，但由于传统的宽带调谐方法与超导不兼容，迄今为止还没有提出适合 MI 的可调谐超导腔。在这里，我们提出了一种可调谐超导腔概念，它能够实现破纪录的性能。调谐将通过使用高速线性致动器来改变金属柱塞插入腔体的深度来实现。这种调谐概念在理论上是可行的，目前已有的技术也可以实现，而且与超导腔完全兼容。
{"title":"A Broadband Mechanically Tuned Superconducting Cavity Design Suitable for the Fermilab Main Injector","authors":"Brian J. Vaughn","doi":"10.1109/TASC.2024.3491418","DOIUrl":"https://doi.org/10.1109/TASC.2024.3491418","url":null,"abstract":"Radio Frequency superconductivity has been a mainstay of accelerator science for decades. However, its benefits have yet to be applied to proton synchrotrons with demanding tuning requirements. For example, the Main Injector (MI), Fermilab's high-energy proton synchrotron, currently utilizes 20+ ferrite-loaded cavities for a targeted 1.2 s acceleration cycle. Harnessing the extremely high gradients associated with superconductivity, the required number of cavities could be reduced by an order of magnitude, dramatically lowering operational power requirements even with cryogenic considerations. Additionally, the current plans for the Fermilab accelerator complex evolution initiative involve almost doubling the number of cavities in MI if the same designs are to be used, further highlighting the potential benefits of superconductivity. These advantages are attractive, but to date, no tunable superconducting cavity suitable for MI has been proposed due to the incompatibility of conventional broadband tuning methods with superconductivity. Here, we present a tunable superconducting cavity concept capable of record-breaking performance. Tuning will be accomplished by using high-speed linear actuators to vary the insertion depth of metallic plungers into the cavity volume. This tuning concept is theoretically viable with currently available technology and will be fully compatible with a superconducting cavity.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-9"},"PeriodicalIF":1.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-06DOI: 10.1109/TASC.2024.3492545
Yan Shaoqi;Wei Xie;Li Jinding;Long Teng;Xiaoling Zhang;Qingduan Meng;Chi Zhang;Jia Wang;Chunguang Li;Yun Wu;Xu Wang;Liang Sun
This article presents a miniaturized C-band high-temperature superconducting triplexer. The triplexer is composed of multimode resonators and adopts the co-coupling structure to reduce its size. Furthermore, the co-coupling structure voids designing the impedance matching structure of triplexers adopting branch line structures and improves the design efficiency of triplexers. Besides, the isolation of the triplexer has been effectively improved by adjusting the coupling between resonators without increasing its size. The measured results show that the center frequencies of the triplexer are 5.503, 6.002, and 6.500 GHz, with relative bandwidths of 1.113%, 1.155%, and 1.115%, respectively. The insertion losses are 0.53, 0.28, and 0.37 dB, respectively. The isolations between channels are larger than 33.9 dB. The adopted approaches benefit to design miniaturized triplexers with high performance.
{"title":"A High-Temperature Superconducting Triplexer Based on Co-Coupling of Multimode Resonators","authors":"Yan Shaoqi;Wei Xie;Li Jinding;Long Teng;Xiaoling Zhang;Qingduan Meng;Chi Zhang;Jia Wang;Chunguang Li;Yun Wu;Xu Wang;Liang Sun","doi":"10.1109/TASC.2024.3492545","DOIUrl":"https://doi.org/10.1109/TASC.2024.3492545","url":null,"abstract":"This article presents a miniaturized C-band high-temperature superconducting triplexer. The triplexer is composed of multimode resonators and adopts the co-coupling structure to reduce its size. Furthermore, the co-coupling structure voids designing the impedance matching structure of triplexers adopting branch line structures and improves the design efficiency of triplexers. Besides, the isolation of the triplexer has been effectively improved by adjusting the coupling between resonators without increasing its size. The measured results show that the center frequencies of the triplexer are 5.503, 6.002, and 6.500 GHz, with relative bandwidths of 1.113%, 1.155%, and 1.115%, respectively. The insertion losses are 0.53, 0.28, and 0.37 dB, respectively. The isolations between channels are larger than 33.9 dB. The adopted approaches benefit to design miniaturized triplexers with high performance.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1109/TASC.2024.3487978
Ning Zhang;John R. Hull
AC losses in high-temperature superconductors are considered a major obstacle in the development of fully superconducting machines. Current methods for measuring ac losses can be difficult to implement for superconducting samples that are large or have complex geometries. This article presents a new method, known as the drag-torque method, for measuring ac losses. The present measurement system involves suspending the superconducting sample holder, which is cooled by liquid nitrogen, in the air using a pair of air-bearing journals. When the sample is placed in a rotating magnetic field generated by a permanent magnet rotor, ac losses are induced in the superconducting material. As a result, the sample holder tends to rotate with the permanent magnet rotor and is stopped by a load cell. By measuring the torque exerted on the load cell, the ac losses can be calculated. This method can be applied to complex superconducting samples, such as coils and stacks of superconducting tapes.
{"title":"A Drag-Torque Method for Measuring AC Losses in Superconducting Samples","authors":"Ning Zhang;John R. Hull","doi":"10.1109/TASC.2024.3487978","DOIUrl":"https://doi.org/10.1109/TASC.2024.3487978","url":null,"abstract":"AC losses in high-temperature superconductors are considered a major obstacle in the development of fully superconducting machines. Current methods for measuring ac losses can be difficult to implement for superconducting samples that are large or have complex geometries. This article presents a new method, known as the drag-torque method, for measuring ac losses. The present measurement system involves suspending the superconducting sample holder, which is cooled by liquid nitrogen, in the air using a pair of air-bearing journals. When the sample is placed in a rotating magnetic field generated by a permanent magnet rotor, ac losses are induced in the superconducting material. As a result, the sample holder tends to rotate with the permanent magnet rotor and is stopped by a load cell. By measuring the torque exerted on the load cell, the ac losses can be calculated. This method can be applied to complex superconducting samples, such as coils and stacks of superconducting tapes.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10738193","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-25DOI: 10.1109/TASC.2024.3486791
Daisuke Saida;Mutsuo Hidaka;Yuki Yamanashi
Prime factorization ( P = M × N ) is considered to be a promising application in quantum computations. We perform 4-bit factorization in experiments using a superconducting flux qubit toward quantum annealing (QA). Our proposed method uses a superconducting quantum circuit implementing a multiplier Hamiltonian, which provides combinations of M and N as a factorization solution after QA when the integer P is initially set. The circuit comprises multiple multiplier units (MUs) combined with connection qubits. The key points are a native implementation of the multiplier Hamiltonian to the superconducting quantum circuit and its fabrication using a Nb multilayer process with a Josephson junction dedicated to the qubit. The 4-bit factorization circuit comprises 32 superconducting flux qubits. Our method has superior scalability because the Hamiltonian is implemented with fewer qubits than in conventional methods using a chimera graph architecture. We perform experiments at 10 mK to clarify the validity of interconnections of a MU using qubits. We demonstrate experiments at 4.2 K and simulations for the factorization of integers four, six, and nine.
质数因式分解（P = M × N）被认为是量子计算中的一项前景广阔的应用。我们在实验中使用超导通量量子比特进行量子退火（QA），实现了 4 位因式分解。我们提出的方法使用一个超导量子电路来实现乘法器哈密顿，当整数 P 初始设定时，该电路在 QA 之后提供 M 和 N 的组合作为因式分解解。电路由多个乘法器单元（MU）和连接量子比特组成。其关键点在于将乘法器哈密顿原生实现到超导量子电路中，并采用铌多层工艺和量子比特专用约瑟夫森结进行制造。4 位因式分解电路由 32 个超导通量量子比特组成。与使用嵌合图架构的传统方法相比，我们的方法用更少的量子位实现了哈密顿，因此具有更优越的可扩展性。我们在 10 mK 下进行了实验，以澄清使用量子比特的 MU 相互连接的有效性。我们演示了在 4.2 K 条件下进行的实验，以及对整数四、六和九的因式分解进行的模拟。
{"title":"4-Bit Factorization Circuit Composed of Multiplier Units With Superconducting Flux Qubits Toward Quantum Annealing","authors":"Daisuke Saida;Mutsuo Hidaka;Yuki Yamanashi","doi":"10.1109/TASC.2024.3486791","DOIUrl":"https://doi.org/10.1109/TASC.2024.3486791","url":null,"abstract":"Prime factorization (\u0000<italic>P</i>\u0000 = \u0000<italic>M</i>\u0000 × \u0000<italic>N</i>\u0000) is considered to be a promising application in quantum computations. We perform 4-bit factorization in experiments using a superconducting flux qubit toward quantum annealing (QA). Our proposed method uses a superconducting quantum circuit implementing a multiplier Hamiltonian, which provides combinations of \u0000<italic>M</i>\u0000 and \u0000<italic>N</i>\u0000 as a factorization solution after QA when the integer \u0000<italic>P</i>\u0000 is initially set. The circuit comprises multiple multiplier units (MUs) combined with connection qubits. The key points are a native implementation of the multiplier Hamiltonian to the superconducting quantum circuit and its fabrication using a Nb multilayer process with a Josephson junction dedicated to the qubit. The 4-bit factorization circuit comprises 32 superconducting flux qubits. Our method has superior scalability because the Hamiltonian is implemented with fewer qubits than in conventional methods using a chimera graph architecture. We perform experiments at 10 mK to clarify the validity of interconnections of a MU using qubits. We demonstrate experiments at 4.2 K and simulations for the factorization of integers four, six, and nine.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-11"},"PeriodicalIF":1.7,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10736342","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1109/TASC.2024.3486249
Grant Giesbrecht;Nathan E. Flowers-Jacobs;Adam Sirois;Manuel A. Castellanos-Beltran;Michael Vissers;Jiansong Gao;Taylor Barton;Paul Dresselhaus
This article presents a method of frequency multiplication which exploits the kinetic inductance of a superconducting coplanar waveguide (CPW). Both frequency doubling and tripling are examined, with attention paid to conversion efficiency. This approach allows up-conversion to be implemented in a miniaturized packaged and cryogenic environment, which can simplify the design of cryogenic systems. We achieved a conversion efficiency of 12.7% and an output power of −5.0 dBm when up-converting a 10-GHz fundamental tone to the 20-GHz second harmonic, which is an improvement compared to higher power room-temperature commercial offerings. To better understand device behavior, we also develop a measurement-based model using a harmonic balance simulation, and achieved good agreement between measurements and simulations.
{"title":"On-Chip Frequency Multiplication Using Kinetic Inductance Within a Coplanar Waveguide","authors":"Grant Giesbrecht;Nathan E. Flowers-Jacobs;Adam Sirois;Manuel A. Castellanos-Beltran;Michael Vissers;Jiansong Gao;Taylor Barton;Paul Dresselhaus","doi":"10.1109/TASC.2024.3486249","DOIUrl":"https://doi.org/10.1109/TASC.2024.3486249","url":null,"abstract":"This article presents a method of frequency multiplication which exploits the kinetic inductance of a superconducting coplanar waveguide (CPW). Both frequency doubling and tripling are examined, with attention paid to conversion efficiency. This approach allows up-conversion to be implemented in a miniaturized packaged and cryogenic environment, which can simplify the design of cryogenic systems. We achieved a conversion efficiency of 12.7% and an output power of −5.0 dBm when up-converting a 10-GHz fundamental tone to the 20-GHz second harmonic, which is an improvement compared to higher power room-temperature commercial offerings. To better understand device behavior, we also develop a measurement-based model using a harmonic balance simulation, and achieved good agreement between measurements and simulations.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1109/TASC.2024.3486124
Yu Hoshika;Shohei Takagi;Tomoyuki Tanaka;Christopher L. Ayala;Nobuyuki Yoshikawa
Adiabatic quantum-flux-parametron (AQFP) logic is an emerging superconducting circuit technology, which is superior in terms of energy dissipation at reasonable clock frequencies. Although multiplication is important for signal or image processing applications, such as fast Fourier transform processors or GPUs, no multipliers implemented in AQFP logic have been demonstrated yet. In this article, we introduce two types of algorithms to calculate multiplication results: array type and Wallace-tree type. We design 4-bit multipliers based on these algorithms using the AIST 10 kA/cm $^{2}$ high-speed standard process and compare these circuits in terms of the following metrics: number of Josephson junctions, circuit latency, area, and power dissipation. As a result, in all respects, the Wallace-tree type is better than the array type. In addition, we experimentally confirm that the fabricated chips containing both types of multipliers are operating correctly at 100 kHz for all test patterns, including random patterns. This is the first time AQFP multipliers have been experimentally demonstrated completely.
{"title":"Design and Demonstration of Array and Wallace-Tree Multiplier Families Using Adiabatic Quantum Flux Parametrons","authors":"Yu Hoshika;Shohei Takagi;Tomoyuki Tanaka;Christopher L. Ayala;Nobuyuki Yoshikawa","doi":"10.1109/TASC.2024.3486124","DOIUrl":"https://doi.org/10.1109/TASC.2024.3486124","url":null,"abstract":"Adiabatic quantum-flux-parametron (AQFP) logic is an emerging superconducting circuit technology, which is superior in terms of energy dissipation at reasonable clock frequencies. Although multiplication is important for signal or image processing applications, such as fast Fourier transform processors or GPUs, no multipliers implemented in AQFP logic have been demonstrated yet. In this article, we introduce two types of algorithms to calculate multiplication results: array type and Wallace-tree type. We design 4-bit multipliers based on these algorithms using the AIST 10 kA/cm\u0000<inline-formula><tex-math>$^{2}$</tex-math></inline-formula>\u0000 high-speed standard process and compare these circuits in terms of the following metrics: number of Josephson junctions, circuit latency, area, and power dissipation. As a result, in all respects, the Wallace-tree type is better than the array type. In addition, we experimentally confirm that the fabricated chips containing both types of multipliers are operating correctly at 100 kHz for all test patterns, including random patterns. This is the first time AQFP multipliers have been experimentally demonstrated completely.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-8"},"PeriodicalIF":1.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1109/TASC.2024.3485097
Yuki Hironaka;Nobuyuki Yoshikawa
In this study, we aimed to achieve high-speed readout operations of Josephson–CMOS hybrid memory. We first experimentally evaluated the timing margin in the readout operations of the hybrid memory. In single-channel bit line measurements, we confirmed that the hybrid memory could work at a 1-GHz memory clock frequency with a timing margin as high as 0.63 ns. Subsequently, we designed and measured a Josephson–CMOS hybrid accumulator circuit to demonstrate high-speed read operations of the hybrid memory. The core design of the Josephson–CMOS hybrid memory follows our previous design. We introduced a sequential-access read-only CMOS memory and a single-flux-quantum accumulator into a test circuit, enabling high-speed measurement of Josephson–CMOS hybrid memory with only two high-speed external inputs. We designed and fabricated a test circuit using the Rohm 180-nm CMOS process and the AIST-ADP2 Josephson process. In the measurement, we achieved correct operation of the test circuit, including the readout operation of the 32-b hybrid memory at a memory clock frequency as high as 1.2 GHz, corresponding to a 38.4-Gb/s readout.
{"title":"Experimental Demonstration of 1.2-Gb/s/Channel Readout Operation of Josephson–CMOS Hybrid Memory","authors":"Yuki Hironaka;Nobuyuki Yoshikawa","doi":"10.1109/TASC.2024.3485097","DOIUrl":"https://doi.org/10.1109/TASC.2024.3485097","url":null,"abstract":"In this study, we aimed to achieve high-speed readout operations of Josephson–CMOS hybrid memory. We first experimentally evaluated the timing margin in the readout operations of the hybrid memory. In single-channel bit line measurements, we confirmed that the hybrid memory could work at a 1-GHz memory clock frequency with a timing margin as high as 0.63 ns. Subsequently, we designed and measured a Josephson–CMOS hybrid accumulator circuit to demonstrate high-speed read operations of the hybrid memory. The core design of the Josephson–CMOS hybrid memory follows our previous design. We introduced a sequential-access read-only CMOS memory and a single-flux-quantum accumulator into a test circuit, enabling high-speed measurement of Josephson–CMOS hybrid memory with only two high-speed external inputs. We designed and fabricated a test circuit using the Rohm 180-nm CMOS process and the AIST-ADP2 Josephson process. In the measurement, we achieved correct operation of the test circuit, including the readout operation of the 32-b hybrid memory at a memory clock frequency as high as 1.2 GHz, corresponding to a 38.4-Gb/s readout.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 1","pages":"1-9"},"PeriodicalIF":1.7,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-21DOI: 10.1109/TASC.2024.3484332
Yao Meng;Yanzheng Zhu;Shuhua Fang;Hong Chen;Yuxiang Zhong
This paper proposes a new variable flux partitioned-stator flux modulation machine with multiple excitations (VF-PSFMMEM), which places permanent magnets (PMs) on the inner stator and rotor simultaneously to enhance torque production, and employs field windings in the inner stator to realize flux weakening. The configuration and operating principle of machine are described. A multi-objective optimization design of machine is developed for obtaining high average torque ( Tavg ), good flux weakening capability and low torque ripple ( Trip ). The electromagnetic performances of VF-PSFMMEM at different excitation sources are analyzed through finite element method. The results indicate that VF-PSFMMEM can provide large flux linkage, high Tavg , low Trip , high efficiency and good flux weakening capability.
{"title":"A New Variable Flux Partitioned-Stator Flux Modulation Machine With Multiple Excitations","authors":"Yao Meng;Yanzheng Zhu;Shuhua Fang;Hong Chen;Yuxiang Zhong","doi":"10.1109/TASC.2024.3484332","DOIUrl":"https://doi.org/10.1109/TASC.2024.3484332","url":null,"abstract":"This paper proposes a new variable flux partitioned-stator flux modulation machine with multiple excitations (VF-PSFMMEM), which places permanent magnets (PMs) on the inner stator and rotor simultaneously to enhance torque production, and employs field windings in the inner stator to realize flux weakening. The configuration and operating principle of machine are described. A multi-objective optimization design of machine is developed for obtaining high average torque (\u0000<italic>T<sub>avg</sub></i>\u0000), good flux weakening capability and low torque ripple (\u0000<italic>T<sub>rip</sub></i>\u0000). The electromagnetic performances of VF-PSFMMEM at different excitation sources are analyzed through finite element method. The results indicate that VF-PSFMMEM can provide large flux linkage, high \u0000<italic>T<sub>avg</sub></i>\u0000, low \u0000<italic>T<sub>rip</sub></i>\u0000, high efficiency and good flux weakening capability.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 8","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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