The Experts below are selected from a list of 45879 Experts worldwide ranked by ideXlab platform
Dan Xiao - One of the best experts on this subject based on the ideXlab platform.
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a new and fast method for on line estimation of d and q axes Inductances of interior permanent magnet synchronous machines using measurements of current derivatives and inverter dc bus voltage
IEEE Transactions on Industrial Electronics, 2019Co-Authors: Minh Xuan Bui, Faz M Rahman, Deqi Guan, Dan XiaoAbstract:This paper proposes a novel on-line technique for estimation of the Inductances of an interior permanent magnet synchronous machine (IPMSM) based on the measurement of dc-bus voltage of the inverter and the stator current derivatives at certain voltage vectors during each pulsewidth modulation (PWM) cycle. This technique removes the requirement for the bulky and expensive shaft-locking mechanisms and test signal injection for obtaining the machine dq Inductance parameters off line. It also overcomes the problems associated with other recursive on-line techniques which take a number of PWM cycles to update the parameters. The proposed method estimates the d and q axes Inductances of IPMSMs within each PWM cycle without requiring knowledge of stator resistance, rotor flux linkage, and rotor speed. It also tracks the variations of the Inductances (especially the q -axis Inductance), which vary significantly due to q -axis magnetic saturation and cross saturation effect of the IPMSM, with sufficient accuracy. This paper presents full analysis, system simulation, and extensive experimental studies in order to verify the accuracy, quick tracking ability, and robustness of the proposed method.
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a preliminary study of the effect of saturation and cross magnetization on the Inductances of a fractional slot concentrated wound interior pm synchronous machine
International Conference on Power Electronics and Drive Systems, 2015Co-Authors: Alireza Pouramin, M.f. Rahman, J.e. Fletcher, Rukmi Dutta, Dan XiaoAbstract:Accurate determination of the variation of Inductances with respect to increase in current is necessary to characterize the behavior of a Permanent Magnet Synchronous Machine (PMSM) under saturation. This is even more crucial in the Fractional Slot Concentrated Wound Interior PM synchronous machine (FSCW IPMSM) because of increased spatial harmonics in the magneto-motive force (MMF) waveform. This paper attempts to determine the variation of Inductances of a prototype FSCW IPMSM due to saturation and cross-magnetization effects. The variation of incremental and apparent Inductances and their effect on voltage equations are investigated. The flux-linkage calculation method was used to calculate the incremental and apparent Inductances for a wide range of operating points including constant torque and flux-weakening regions. The results of a Finite Element (FE) model which agree well with the experimental results were used to further investigate the Inductance characteristics.
F C Lee - One of the best experts on this subject based on the ideXlab platform.
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hybrid integration of a low voltage high current power supply buck converter with an ltcc substrate inductor
IEEE Transactions on Power Electronics, 2010Co-Authors: Michele Hui Fern Lim, Jacobus Daniel Van Wyk, F C LeeAbstract:Miniaturization of hybrid integrated buck converters is impeded by the difference in growth laws in current rating for silicon and for inductors as current rating increases. In the 20 A range, this leads to the attractive feasibility of planarizing the output inductor as the largest component by utilizing low-temperature cofired ceramic technology in the form of the (magnetic) substrate to carry the rest of the converter circuit. The presence of a magnetic substrate below the circuitry creates additional parasitic Inductances, which results in low-frequency oscillations. From simulation, the presence of a conductive shield reduces trace Inductances and improves circuit performance. There is a minimum shield thickness required to minimize losses associated with ringing. High-shield conductivity is necessary to lower the trace Inductance and minimize power loss. Traces should be placed close to the shield to minimize Inductance. Experimental results on converters with ceramic-based shield layers and organics-based shield layers bear out the theoretical expectations and establish the practical viability of the proposed hybrid integration technology.
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critical Inductance in voltage regulator modules
IEEE Transactions on Power Electronics, 2002Co-Authors: Pitleong Wong, F C Lee, Kaiwei YaoAbstract:Multichannel interleaving makes it possible to use small Inductances to improve voltage regulator modules' (VRMs) transient responses. However, smaller Inductances reduce efficiency. Analysis shows that the transient responses are not only determined by the Inductances but also the control bandwidths. This paper presents the concept of critical Inductance in VRM. Critical Inductance is the largest Inductance that gives the fastest transient responses. Critical Inductance is a good reference for optimal VRM design. Critical Inductance is a function of the feedback control, the step current magnitude and the steady-state operating point.
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critical Inductance in voltage regulator modules
Applied Power Electronics Conference, 2002Co-Authors: Pitleong Wong, F C Lee, Kaiwei YaoAbstract:Multi-channel interleaving makes it possible to use small Inductances to improve voltage regulator module's (VRM's) transient responses. However, smaller Inductances reduce efficiency. Analysis shows that the transient responses are not only determined by the Inductances but also the control bandwidths. This paper presents the concept of critical Inductance in VRM. Critical Inductance is the largest Inductance that gives the fastest transient responses. Critical Inductance is a good reference for the VRM optimal design. Critical Inductance is a function of the feedback control, step current magnitude, and steady-state operating point.
Kaiwei Yao - One of the best experts on this subject based on the ideXlab platform.
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critical Inductance in voltage regulator modules
IEEE Transactions on Power Electronics, 2002Co-Authors: Pitleong Wong, F C Lee, Kaiwei YaoAbstract:Multichannel interleaving makes it possible to use small Inductances to improve voltage regulator modules' (VRMs) transient responses. However, smaller Inductances reduce efficiency. Analysis shows that the transient responses are not only determined by the Inductances but also the control bandwidths. This paper presents the concept of critical Inductance in VRM. Critical Inductance is the largest Inductance that gives the fastest transient responses. Critical Inductance is a good reference for optimal VRM design. Critical Inductance is a function of the feedback control, the step current magnitude and the steady-state operating point.
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critical Inductance in voltage regulator modules
Applied Power Electronics Conference, 2002Co-Authors: Pitleong Wong, F C Lee, Kaiwei YaoAbstract:Multi-channel interleaving makes it possible to use small Inductances to improve voltage regulator module's (VRM's) transient responses. However, smaller Inductances reduce efficiency. Analysis shows that the transient responses are not only determined by the Inductances but also the control bandwidths. This paper presents the concept of critical Inductance in VRM. Critical Inductance is the largest Inductance that gives the fastest transient responses. Critical Inductance is a good reference for the VRM optimal design. Critical Inductance is a function of the feedback control, step current magnitude, and steady-state operating point.
D Howe - One of the best experts on this subject based on the ideXlab platform.
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winding Inductances of fractional slot surface mounted permanent magnet brushless machines
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2009Co-Authors: A M Elrefaie, Z Q Zhu, Thomas M Jahns, D HoweAbstract:Purpose – Permanent magnet (PM) brushless machines equipped with fractional‐slot concentrated‐windings (FSCW) have been receiving considerable attention over the past few years, due to the fact that they have short end‐windings, a high‐slot fill factor, a high efficiency and power density, and good flux‐weakening and fault‐tolerance capabilities. A key design parameter for such machines is the phase winding Inductance since this has a significant impact on the performance, as well as on the magnitude of any reluctance torque. The purpose of this paper is to describe a detailed investigation of the various components of the winding Inductance in machines equipped with both overlapping and non‐overlapping windings and different slot/pole number combinations. It also examines the influence of key design parameters, which affect the Inductance components, with particular reference to the Inductances of machines in which all the teeth are wound and those in which only alternate teeth are wound.Design/methodolo...
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winding Inductances of fractional slot surface mounted permanent magnet brushless machines
IEEE Industry Applications Society Annual Meeting, 2008Co-Authors: A M Elrefaie, Z Q Zhu, Thomas M Jahns, D HoweAbstract:Permanent magnet (PM) brushless machines equipped with fractional-slot concentrated-windings (FSCW) have been receiving considerable attention over the past few years, due to the fact that they have short end-windings, a high slot fill factor, a high efficiency and power density, and good flux- weakening and fault-tolerance capabilities. A key design parameter for such machines is the phase winding Inductance since this has a significant impact on the performance, as well as on the magnitude of any reluctance torque. The paper describes a detailed investigation of the various components of the winding Inductance in machines equipped with both overlapping and non- overlapping windings and different slot/pole number combinations. It also examines the influence of key design parameters, which affect the Inductance components, with particular reference to the Inductances of machines in which all the teeth are wound and those in which only alternate teeth are wound. It is shown that the main component of the winding Inductance is the relatively large slot leakage component. Both analytical and finite element models are employed and predicted results are validated on several prototype machines.
Chengkok Koh - One of the best experts on this subject based on the ideXlab platform.
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exact closed form formula for partial mutual Inductances of rectangular conductors
IEEE Transactions on Circuits and Systems I-regular Papers, 2003Co-Authors: Guoan Zhong, Chengkok KohAbstract:In this brief, we propose a new exact closed-form mutual Inductance equation for rectangular conductors. We express the mutual Inductance between two parallel rectangular conductors as a weighted sum of self Inductances. We do not place any restrictions on the alignment of the two parallel rectangular conductors. Moreover, they could be coplanar or reside on different layers. Most important, experimental results show that our formula is numerically more stable than that derived by Hoer and Love.
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exact closed form formula for partial mutual Inductances of on chip interconnects
International Conference on Computer Design, 2002Co-Authors: Guoan Zhong, Chengkok KohAbstract:In this paper we propose a new exact closed form mutual Inductance equation for on-chip interconnects. We express the mutual Inductance between two parallel rectangular conductors as a weighted sum of self-Inductances. We do not place any restrictions on the alignment of the two parallel rectangular conductors. Moreover they could be co-planar or reside on different layers. Most important, experimental results show that our formula is numerically more stable than that derived by Hoer and Love (1965) for long parallel onchip interconnects.
