Comparison of Different Capacitor Tuning Criteria in Air-Cored Resonant Induction Machines

Jin, Zhao; Iacchetti, Matteo F.; Smith, Alexander C.; Deodhar, R.; Mishima, Keisuke

doi:10.1109/ecce.2019.8913143

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…The realization of the motor circuit is achieved by selecting a suitable resonance topology in the stator and rotor windings. The SS resonant topology minimizes the impedance on the stator side and maximizes the current amplitude [14], [27]. The SS resonant topology also achieves good tolerance and better response to the fluctuations in the coupling coefficients of the windings.…”

Section: Machine Circuit Analysismentioning

confidence: 99%

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Design of a Coreless Multi-Phase Electric Motor Using Magnetic Resonant Coupling

Ebot

Fujimoto

2022

IEEE Trans. Magn.

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With the emergence of electric vehicles and electric aircraft technologies, lightweight motors have become a requirement. Conventional motors are generally made up of coils, permanent magnets, heavy iron stators, and rotor cores. This paper presents complete analytical modeling and design of a novel coreless multi-phase magnetic resonant motor, conceptualized through the approach of magnetic resonance coupling. The removal of magnetic iron cores drastically reduces the weight of the resulting motor. The stator and rotor cores of the motor are made of reinforced plastic fibers and can be 3-D printed. Unrelated to the general operating principle of existing conventional electric motors, resonant wireless power transfer is the key feature of these motors. All the essential machine characteristics such as self-inductance, mutual inductance, torque, and frequency domains are fully developed. The mathematical modeling of the machine's physical phenomena is linked to its operation by simulation. The paper shows the design concept and discusses the simulation procedure used to verify the developed analytical model through finite element analysis from the established modeling topology equivalent to the proposed configuration motor model. Although the design is straightforward, accurate analytical modeling and analysis are significant challenges to consider.

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Section: Machine Circuit Analysismentioning

confidence: 99%

“…In the stator and rotor phase winding, typically C 1a = C 1b and C 2a = C 2b respectively. These capacitors are also a source of losses in the MMRM [27], [31].…”

Section: Analytical Validation Through 2-d Feamentioning

confidence: 99%

Design of a Coreless Multi-Phase Electric Motor Using Magnetic Resonant Coupling

Ebot

Fujimoto

2022

IEEE Trans. Magn.

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“…The performance analysis, including torque and efficiency calculations, can be carried out using the standard per-phase equivalent circuit, where the key parameters are the inductance and capacitance values. Several tuning criteria for the capacitors have been discussed and compared in [3] and [4], but the calculation of air-cored IM inductances has not been studied thoroughly in previous works. Analytic expressions for the inductances of ACRIMs can be found in [5] and [6], but they are derived under the assumption of two-dimensional (2-D) current sheet distributions or using the 2-D field solution of wires with round cross-sections, none of them is based on threedimensional (3-D) models, and therefore are not accurate for an air-cored machines.…”

Section: Takedown Policymentioning

confidence: 99%

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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“…The MRC motor is a novel motor that can perform energy conversion without iron cores (magnetic cores) (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) , and its operating principle combines the energy transfer technologies of MRC and induction motors. Basically, an induction motor transmits energy through the electromagnetic induction between a primary side and a secondary side through an air gap.…”

Section: Principles and Behavior Of The Mrc Motormentioning

confidence: 99%

“…Kurs et al proposed a novel technology that can transfer electromagnetic energy between two separated coils via electromagnetic resonance coupling (1) . Moreover, Sakai et al (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) proposed a novel motor in which energy is converted through MRC between the three-phase windings of a stator and a rotor, and they also used the conventional induction motor technology.…”

Section: Introductionmentioning

confidence: 99%

Design Method for Ultralightweight Motor Using Magnetic Resonance Coupling and its Characteristics

Takishima

Sakai

2022

IEEJ Journal IA

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In this paper, we propose a design method for a novel motor using magnetic resonance coupling (MRC) to enable the practical use of electric aircraft. The proposed motor can transfer electrical energy between a stator and a rotor via MRC, which does not require magnetic cores, thus realizing an ultralightweight design. Moreover, we detail the operating characteristics of the proposed motor and its equivalent circuit, analysis, and experiments. From the analysis, we clarify that the proposed MRC motor has a sufficient strength at an ultrahigh speed, and we describe its essential characteristics and the usefulness of its equivalent circuit. Further, our analytical and experimental results confirm that the proposed MRC motor can transfer electrical energy between a stator and a rotor, thereby generating torque.

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Comparison of Different Capacitor Tuning Criteria in Air-Cored Resonant Induction Machines

Cited by 11 publications

References 7 publications

Design of a Coreless Multi-Phase Electric Motor Using Magnetic Resonant Coupling

Design of a Coreless Multi-Phase Electric Motor Using Magnetic Resonant Coupling

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

Design Method for Ultralightweight Motor Using Magnetic Resonance Coupling and its Characteristics

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