Influences of Winding MMF Harmonics on Torque Characteristics in Surface-Mounted Permanent Magnet Vernier Machines

Jang, Daekyu; Chang, Junghwan

doi:10.3390/en10040580

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…The proposed machine parameters with non-uniform tooth distribution considering the suitable width of tooth and tooth pitch between main and auxiliary tooth, is presented in Table 4. The selected τ t corresponding to the number of k in Equation ( 17) is 19. In order to verify the advantage of the proposed machine, FEM is used to verify machine performance.…”

Section: Fem Results Of Proposed Topologymentioning

confidence: 99%

“…Considering the symmetry of three phasors, a 240 • angle is also a feasible angle to control total cogging torque as 120 • , while a 360 • different angle causes all cogging torque harmonics to be tripled. In order to realize the above angle, the tooth pitch between main and auxiliary tooth trends to be set as 15,16,17,18,19)…”

Section: Cogging Torquementioning

confidence: 99%

“…However, the composition of magnetomotive force (MMF) caused by winding layout is not analyzed in detail, which is one key factor in machine design and harmonic utilization. In another analysis, winding MMF is proposed in similar topology, and the design method is given with a sinusoidal function [19] for the split-pole type PMVM. However, the extra cogging torque caused by non-uniform FMPs distribution is not discussed.…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

et al. 2021

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To improve the torque performance of the permanent magnet vernier machine in the direct-drive system for Unmanned Aerial Vehicle (UAV), this paper proposes the topology of non-uniform tooth distribution. This distribution, considering the additional flux harmonics, aims to contribute to torque improvement, whereas the cogging torque also increases at the same time. A phasors method is proposed to solve the issue caused by the non-uniform structure, adjusting the mechanic angle of each tooth reasonably to restrict the cogging torque. In addition, the non-uniform design is illustrated in detail, which includes the method of grouping the teeth, considering the factors of series pole ratio and winding layout. By using the three-dimensional finite element method, torque is significantly increased without additional torque ripple, which satisfies the desired design target.

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Section: Fem Results Of Proposed Topologymentioning

confidence: 99%

Section: Cogging Torquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

et al. 2021

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“…In this regard, permanent magnet vernier generators (PMVGs) have gained much interest in wind energy conversion systems (WECSs) because they can generate higher torque density even in low-speed conditions due to their magnetic gear effect compared to PMSG. Furthermore, it has a significantly greater output power density since it employs the primary permanent magnet flux as the modulation flux simultaneously [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Reference Model Adaptive Control Scheme on PMVG-Based WECS for MPPT under a Real Wind Speed

2022

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Over the last few years, improving power extraction from the wind energy conversion system (WECS) under varying wind speeds has become a complex task. The current study presents the optimum maximum power point tracking (MPPT) control approach integrated with neural network (NN)-based rotor speed control and pitch angle control to extract the maximum power from the WECS. So, this study presents a reference model adaptive control (RMAC) for a direct-drive (DD) permanent magnet vernier generator (PMVG)-based WECS under real wind speed conditions. Initially, the RMAC-based rotor speed tracking control is presented with adaptive terms, which tracks a reference model that guarantees the expected exponential decay of rotor speed error trajectory. Then, to reduce the wind speed measurement errors, a recurrent neural network (RNN)-based training model is presented. Moreover, the asymptotic stability of the proposed control method is mathematically proven by Lyapunov theory. In addition, the pitch angle control is presented to efficiently operate the rotor speed within the allowable operating range. Eventually, the proposed control system demonstrates its effectiveness through simulation and experimentation using a prototype of 5 kW DD PMVG-based WECS. After that, the comparative results affirm the superiority of the proposed control method over existing control methods.

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“…In the previous studies, regardless of the winding configurations, the FMPs were designed at equal intervals, and the resulting permeance distribution consisted of only the spatial harmonics corresponding to multiples of the FMF numbers [11][12][13]. However, the output torque of the SPMVM can be improved by adjusting the FMP shape to change the harmonic components of the permeance that create the working harmonic by interacting with the winding MMF harmonics [14]. Hence, to maximize the output torque of the SPMVM, the FMPs shape of the SPMVM is necessary to be designed with consideration to the harmonic characteristics of the permeance and winding MMF.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Surface-Mounted PM Vernier Machines Considering Harmonic Characteristics of Winding MMF

Jang

Chang

2019

Energies

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This paper proposes a design method for the flux modulation poles (FMPs) formed on the stator of surface-mounted permanent magnet vernier machines (SPMVM) considering the winding configurations. In three types of the SPMVM with the different winding configurations, the FMP shapes to maximize the output torque are optimized by employing the analytical equations for the magneto-motive force (MMF) due to the windings, permeance, and flux density in the air-gap. Then, the validity of the optimal shapes for the FMPs is verified by the finite element analysis. It is found that the optimal FMP shapes are designed differently in the three types of the SPMVM and increase the output torque by different ratios according to the winding configurations. In addition, the experimental results for the prototype show that the proposed method can optimally design the FMP shape by analyzing mathematically the effects of the winding configuration and the FMP shape on the output torque of the SPMVM.

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Influences of Winding MMF Harmonics on Torque Characteristics in Surface-Mounted Permanent Magnet Vernier Machines

Cited by 10 publications

References 21 publications

Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

Design and Analysis of a Permanent Magnet Vernier Machine with Non-Uniform Tooth Distribution

Reference Model Adaptive Control Scheme on PMVG-Based WECS for MPPT under a Real Wind Speed

Design and Analysis of Surface-Mounted PM Vernier Machines Considering Harmonic Characteristics of Winding MMF

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