Slot Harmonic Effect on Magnetic Forces and Vibration in Low-Speed Permanent-Magnet Machine With Concentrated Windings

Valavi, Mostafa; Nysveen, Arne; Nilssen, Robert; Rølvåg, Terje

doi:10.1109/tia.2014.2309717

Cited by 51 publications

(26 citation statements)

References 15 publications

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“…number of pole pairs). The second largest component is the 64 th harmonic which is caused by slotting effect [29]. Harmonic orders of radial flux density in the outer airgap of case II are presented in Fig.…”

Section: Single Vs Double Layer Windingsmentioning

confidence: 98%

Multiple-airgap iron-cored direct-driven permanent magnet wind generators

Valavi

Matveev²,

Nysveen

et al. 2014

2014 International Conference on Electrical Machines (ICEM)

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Multiple-air-gap permanent magnet (PM) generators with iron cores are analysed for application in wind turbines. Electromagnetic analysis of a double-stator, radialflux, low-speed PM generator with concentrated windings using time-stepping finite element analysis is presented. Two design variants -with magnetic and non-magnetic rotor yokes -are considered. Magnetic flux density, output electrical characteristics and electromagnetic torque are compared for the two variants. Generator structure (one vs. two level machines), winding topology (single vs. double layer windings) are discussed for the machine with magnetic rotor yoke. Finally, optimal number of air gaps is proposed based on predictions of generator's power density and cost.Index Terms-Permanent magnet machines, direct-driven wind generators, multiple-airgap machines, iron-cored machines, concentrated windings.978-1-4799-4389-0/14/$31.00 ©2014 IEEE

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Section: Single Vs Double Layer Windingsmentioning

confidence: 98%

Multiple-airgap iron-cored direct-driven permanent magnet wind generators

Valavi

Matveev²,

Nysveen

et al. 2014

2014 International Conference on Electrical Machines (ICEM)

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“…Hence, by fixing the high-speed PM mover and the iron yoke, the pullout thrust forces ( ) ls F that can be supplied to the low-speed PM mover can be evaluated by using either the equivalent Maxwell's stress tensor [9] or the virtual work approach [10] in the longitudinal direction as:…”

Section: Component Thicknesses Of the Linear Magnetic Gearsmentioning

confidence: 99%

Designs and feasibility assessments of an integrated linear electromagnetic actuator for cold roll mill applications

Liu

Chiu

Hwang

2015

2015 IEEE Industry Applications Society Annual Meeting

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This paper will present the detailed feasibility and design assessments of a linear electromagnetic actuator that can be adopted for providing the required roll gap adjustment forces directly. A systematic analyzing scheme will be developed to optimize the system structures within specified physical constraints and steady-state operational requirements. The magnetic fluxes, thrust generations, and force densities that can be provided by the proposed system will be analyzed in detail, and the comparisons with those conventional electromagnetic devices will be provided. By considering the related system response time, the corresponding dynamic operational performances are also investigated. Hence, the replacement feasibilities of such electromagnetic systems for those commonly used hydraulic cylinder/servo valve compositions in the tandem roll mill can be confirmed.

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“…In the past years, the research of slot harmonics and modulation effect are mainly focused on parasitic effects such as cogging torque [8] [9], torque ripple [10], unbalanced magnetic force [11] [12], noise and vibration [13] [14]. The influence of slotting modulation on the PM and rotor iron losses have also been investigated in [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Air-Gap Field Modulation and Magnetic Gearing Effect in Fractional-Slot Concentrated-Winding Permanent-Magnet Synchronous Machines

Zhu

Liu

2018

IEEE Trans. Ind. Electron.

186

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Abstract-In this paper, the torque production of fractional slot concentrated winding (FSCW) permanent magnet synchronous machines (PMSM) are analyzed from the perspective of the air-gap field harmonics modulation accounting for slotting effect. It is found that the average torque of FSCW PMSM is produced by both the principle of conventional PMSM and the magnetic gearing effect. A finite element analysis (FEA)-based equivalent current sheet model and harmonic restoration method is firstly used in FSCW PM machines with different slot-pole number combinations to quantify the respective contribution of the conventional PMSM and the magnetic gearing effect to the average torque. The influence of slot opening on the magnetic gearing effect, cogging torque and torque ripple is analyzed. The results show that the magnetic gearing effect makes a non-ignorable contribution to the average torque when a large slot opening stator is used. The expression of the gear ratio in FSCW PMSMs is derived. The influence of gear ratio on the contribution of the magnetic gearing effect to the total torque is investigated by FEA. The FEA predicted torques are validated by experiments on the prototypes.

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Slot Harmonic Effect on Magnetic Forces and Vibration in Low-Speed Permanent-Magnet Machine With Concentrated Windings

Cited by 51 publications

References 15 publications

Multiple-airgap iron-cored direct-driven permanent magnet wind generators

Multiple-airgap iron-cored direct-driven permanent magnet wind generators

Designs and feasibility assessments of an integrated linear electromagnetic actuator for cold roll mill applications

Analysis of Air-Gap Field Modulation and Magnetic Gearing Effect in Fractional-Slot Concentrated-Winding Permanent-Magnet Synchronous Machines

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