Starting Characteristics of an Ultra-Lightweight Motor Using Magnetic Resonance Coupling

Takishima, Kenta; Sakai, Kazuto

doi:10.23919/ipec.2018.8507420

Cited by 5 publications

(8 citation statements)

References 3 publications

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“…Each characteristic value by the equivalent circuit method was obtained using Eqs. (20)-(22) (6) . Here, V 1 , I 1 , I 2 , T, and p are the primary voltage, the primary current, the secondary current, the torque, Table 10, the radial-flux-type equivalent circuit method is in good agreement with the results of the FEA, while the equivalent circuit method is effective for examining the motor characteristics.…”

Section: Verifications Of the Equivalent Circuit Methodsmentioning

confidence: 99%

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Starting Characteristics of Axial and Radial Type Ultra-Lightweight Motors Based on Magnetic Resonance Coupling

Takishima

Sakai

2019

IEEJ Journal IA

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In this paper, we propose a novel machine that transfers electrical energy between the stator and the rotor via magnetic resonance coupling (MRC). As the energy conversion in an MRC does not require any magnetic core, its mechanism realizes an ultra-lightweight motor for potential use in an energy-efficient electric aircraft. The MRC-based motor, its design, operating principles, starting characteristics, and resonance conditions are discussed in detail herein. Through magnetic analysis, we clarify the essential characteristics of the proposed MRC motor and verify the resonance conditions calculated from the equivalent circuit. Our results confirm that the proposed MRC motor transfers electrical energy between the stator and the rotor, thereby generating torque. We further verify that the resonance conditions derived from the equivalent circuit achieve a resonant state. Kenta Takishima (Student Member) received a B.Eng. degree from Toyo University, Japan. He is enrolled in the course of Electricity, Electronics and Communications at the Graduate School of Science and Engineering, Toyo University as of 2017. His technical efforts include the research of high-performance machines for electric aircraft and vehicles, and energy conversion systems. Kazuto Sakai (Senior Member) received a Dr. Eng. degree from Yamaguchi University, Japan. He worked at Toshiba Corporation, Power and Industrial Systems Research and Development Center from 1983 to 2010, where he developed an AC motor drive technology for servomotors, railroad, and hybrid vehicles, and superhigh-speed generators for cogeneration. He joined Toyo University in 2010 as a professor in the department of Electrical, Electronic and Communication Engineering. His technical efforts include the research of energy conversion and power electronics, high-performance PM motors and induction motor drives for electric vehicles and railways, and wireless power transfer using electromagnetic resonant coupling.

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Section: Verifications Of the Equivalent Circuit Methodsmentioning

confidence: 99%

“…Under the parallel resonance condition, the resonant frequency is given by Eq. (6). In other words, the reactance component of the impedance in Eq.…”

Section: Equivalent Circuit and Resonance Conditions Of The Proposed mentioning

confidence: 99%

Starting Characteristics of Axial and Radial Type Ultra-Lightweight Motors Based on Magnetic Resonance Coupling

Takishima

Sakai

2019

IEEJ Journal IA

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“…Fig. 4 compares the efficiency-torque loci, and torque, efficiency, power factor, stator current versus slip charac- (6), and tuning (c) with modified reference slip s 0 = 0.0172 in (9) in order to achieve the same peak torque. This modified tuning (c) still described by (8) achieves a torque-slip characteristic very similar to (a), with the same motoring-mode peak torque, 119.6Nm.…”

Section: An Acrim Case Studymentioning

confidence: 99%

“…The equivalent circuit incorporating stator and rotor capacitors has been introduced in [6] and validated by FE analysis. The experimental validation was reported in [7], but only for operation at zero speed.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental validation was reported in [7], but only for operation at zero speed. In [6], the focus is limited to the operation with stator and rotor capacitors tuned in order to cancel out the stator and rotor self-inductances respectively: no other options are considered and little insight is given into the optimal operating points for torque or efficiency. Reference [8] provides a thorough analysis of the operation with both stator and rotor capacitors -tuned to cancel the stator and rotor leakage inductances respectively, and considers also the more practical option of using stator capacitors only -tuned to achieve resonance, i.e.…”

Section: Introductionmentioning

confidence: 99%

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

Jin

Iacchetti

Smith

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

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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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Starting Characteristics of an Ultra-Lightweight Motor Using Magnetic Resonance Coupling

Cited by 5 publications

References 3 publications

Starting Characteristics of Axial and Radial Type Ultra-Lightweight Motors Based on Magnetic Resonance Coupling

Starting Characteristics of Axial and Radial Type Ultra-Lightweight Motors Based on Magnetic Resonance Coupling

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

Design Optimization Procedure of Air-Cored Resonant Induction Machines

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