Winding Inductance Estimations in Air-Cored Resonant Induction Machines

Jin, Zhao; Iacchetti, Matteo F.; Smith, Alexander C.; Deodhar, R.; Komi, Yoshiyuki; Abduallah, Ahmad Anad; Umemura, Chiaki

doi:10.1109/ecce44975.2020.9236229

Cited by 7 publications

(8 citation statements)

References 6 publications

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“…voltage. This is the main idea behind air-cored resonant induction machines (ACRIMs) [1]. The concept was firstly proposed in [2].…”

Section: Takedown Policymentioning

confidence: 99%

“…The proposed method is validated against 3-D FEA. Compared to [1], this paper also adds an experimental validation on an ACRIM prototype: the determination of the coil shape using measurable prototype geometric parameters is presented, from which the estimated winding inductance values are calculated then compared with the measured values. The estimation accuracy is also validated in the comparison between the analytically-predicted and tested ACRIM performance.…”

Section: Takedown Policymentioning

confidence: 99%

“…4, where ωs is the stator supply frequency, k is the stator-to-rotor turns ratio, s is the slip value, Rs, Rr are the stator and rotor per-phase resistance respectively, Cs and Cr are the stator and rotor capacitance respectively, Ls, Lr are the stator and rotor self-inductances respectively, Lm is the magnetizing inductance. The detailed derivation for winding inductance values has been given in [1], so only the final expressions are presented here. The stator and rotor selfinductance values used in the equivalent circuit are.…”

Section: The Equivalent-circuit Inductancesmentioning

confidence: 99%

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A Fast 3-D Winding Inductance Estimation Method for Air-Cored Resonant Induction Machines

Jin

Iacchetti

Smith

et al. 2022

IEEE Trans. on Ind. Applicat.

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The air-cored resonant induction machine removes the magnetic core so the fields produced by the windings are truly 3-D in nature. The end-windings normally regarded as a non-active and leakage source in conventional iron-cored machines now become an active part and contribute to the torque production. Therefore, the electromagnetic modeling can no longer be reduced to a 2-D analysis and the 3-D inductance calculation becomes a key problem. The 3-D Finite Element Analysis (FEA) can solve the 3-D magnetic field but, firstly, the validity of its solution depends on the precision in geometry modeling. In particular, representing the end-winding region avoiding conductor clashing can be very complicated. Secondly, 3-D FEA solutions are computationally-slow and therefore inefficient as an "internal routine" of an optimization procedure. This paper proposes a fast analytic 3-D winding inductance estimation method for air-cored resonant induction machines. The approach breaks down the real coils into straight conductors and represents them by single filaments located at their centers, then uses closed-form expressions derived from Neumann integrals to calculate the coil self and coil-to-coil mutual inductances which are then collected into winding phase self and mutual inductances. All the independent coil-pair contributions are isolated so as to eliminate redundant calculations. Good accuracy of the calculated results is confirmed by validation against both 3-D FEA and experimental results, including winding inductance breakdown and overall machine tested performance.

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“…voltage. This is the main idea behind air-cored resonant induction machines (ACRIMs) [1]. The concept was firstly proposed in [2].…”

Section: Takedown Policymentioning

confidence: 99%

Section: Takedown Policymentioning

confidence: 99%

Section: The Equivalent-circuit Inductancesmentioning

confidence: 99%

See 1 more Smart Citation

A Fast 3-D Winding Inductance Estimation Method for Air-Cored Resonant Induction Machines

Jin

Iacchetti

Smith

et al. 2022

IEEE Trans. on Ind. Applicat.

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“…However, [8]- [10] do not cover the design procedure. Considering there is no magnetic core in air-cored machines and therefore the magnetic field is inherently 3-D, [11] proposes a fast 3-D inductance estimation method for ACRIMs using closed-form expressions without relying on the computationallydemanding 3-D FEA, but the design optimization of ACRIMs is not discussed.…”

Section: Introductionmentioning

confidence: 99%

“…3-D FEA can be computationally-heavy, and modeling the detailed endwinding shape to avoid conductors intersecting from design to design can also be time-consuming, so 3-D FEA can be hard to incorporate into an optimisation procedure. [11] proposes an analytic method for 3-D inductance calculation for aircored windings which is computationally-fast and 3-D-FEAfree. It uses closed-form solutions of Neumann integrals for a pair of conductors with any mutual orientation, it is robust and can handle crossing points in the coil ends without being affected by numeric singularities and is suitable for analytic implementation without detailed modeling of end-winding shape and end-region arrangement in 3-D FEA.…”

mentioning

confidence: 99%

Design Optimization Procedure of Air-Cored Resonant Induction Machines

Jin

Iacchetti

Smith

et al. 2021

2021 IEEE Energy Conversion Congress and Exposition (ECCE)

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The air-cored resonant induction machine removes the iron core which makes its magnetic field truly 3-D in nature. The axial conductors and end windings now both become active components contributing to torque production. The whole winding therefore needs to be considered in the design process. Conventional 3-D finite element analysis has large computational costs and is hard to integrate into the design optimization. This paper presents a new design optimization procedure for air-cored resonant induction machines using closed-form solutions of Neumann integrals which are computationally fast and considers the 3-D magnetic field distributions created by the air-cored coils. Optimized designs for two tuning options in the literature: option I with stator capacitors only and option II with both stator and rotor capacitors, are presented. The optimization trends with respect to different machine parameters are also discussed.

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