Influence of Various Magnetic Pole on Electromagnetic Performance of Consequent-Pole Permanent Magnet Machine

Li, Feng; Wang, Kai; Sun, Haiyang; Kong, Jinwang

doi:10.1109/access.2019.2936920

Cited by 7 publications

(8 citation statements)

References 19 publications

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“…From the stator side, design and optimization methods are carried out on different parts, e.g., slot-opening width, auxiliary tooth, dummy slot, tooth width, and skewing [5]- [9]. Similarly, it is also proved to be effective in rotor optimization, e.g., pole shaping, pole arc width, auxiliary salient poles, and rotor skewing [9]- [18]. Among the foregoing techniques, skewing, including both the stator and the magnet poles, occurs to be more popular.…”

Section: Introductionmentioning

confidence: 99%

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Chen

et al. 2020

IEEE Access

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In this paper, a salient-pole permanent magnet synchronous machine (SPPMSM) is introduced to high-speed trains, taking advantage of its high utilization of the reluctance torque from the unbalanced reactance. Torque characteristics, such as average torque and torque ripple, are rather important and should be carefully concerned during the optimal design of the SPPMSM. Both the eccentric air-gap and the advanced step-skewed rotor (ASSR) design are developed and implemented to reduce the torque ripple for comfort and safety issues. Compared to the conventional step-skewed rotor (CSSR), the ASSR takes advantage of the high utilization of permanent magnets (PMs), which are axial continuous assembled, and the easier manufacture with a single rotor lamination model, which is asymmetrically designed with pole shoes skewed by individual skewing angles. No skewing arrangement is applied to the rotor yoke and the PM chambers. The impacts of the eccentric air-gap and the ASSR on the torque characteristics are comprehensively investigated by finite element analysis. The results show that the proposed technique can significantly reduce the torque ripple with a slight expense of the average torque. Based on the optimal eccentric design, experiments of the SPPMSM with the non-skewed rotor, CSSR, and ASSR under various conditions are carried out to validate the estimated results. INDEX TERMS Eccentricity design, permanent magnet synchronous machine, step-skewed rotor, torque ripple.

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Section: Introductionmentioning

confidence: 99%

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Chen

et al. 2020

IEEE Access

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“…Figure 15 shows the second two-segment method. The modular distance satisfies S 1 = (2m 1 ± 1)τ, and the end force f is a symmetrical waveform with a period of τ, which can be expressed as a piecewise Equation (10). The displacement can be divided into two intervals in each cycle.…”

Section: Second Two-segment Design To Adjust the Period To τmentioning

confidence: 99%

“…IP and PM are alternately arranged for excitation. This structure has been applied to both rotary motor [2][3][4][5][6][7][8][9][10][11][12][13] and linear motor [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The asymmetric air-gap flux density results in even-numbered back-EMF harmonics, bigger torque ripple, severe end magnetization, as well as unbalanced magnetic tension. In order to overcome these shortcomings, slot/pole combination [7,8], multilayer windings or equal-pole-arc magnetic pole [9], and asymmetric magnetic pole structure [10] can be used to reduce or eliminate even-numbered back-EMF harmonics. The torque or thrust ripple can be suppressed by modular structure, eccentric shape PMs, skewed poles, and non-uniform air gap [11].…”

Section: Introductionmentioning

confidence: 99%

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Research on Segmented Primary Consequent-Pole Permanent Magnet Linear Synchronous Motor with Symmetric and Periodic End Force

Huang

Zhang

et al. 2021

Symmetry

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The end force of North-South permanent magnet linear synchronous motor (NS-PMLSM) fluctuates symmetrically with a period of one pole. Different from it, the end force’s fluctuation cycle of the consequent-pole permanent magnet linear synchronous motor (CP-PMLSM) is usually two poles and asymmetrical. Especially, within two half cycles, the end force presents complex asymmetric characteristics. In this paper, a piecewise function model of the end force of CP-PMLSM is established. Then a primary segmented design method for adjusting the period, symmetry and phase of the end force waveform is proposed. The two-segment and grouped four-segment modular distances are combined and matched to eliminate the odd-numbered harmonics of the end force and suppress the thrust ripple. A slotless primary core experimental platform and a slotted CP-PMLSM prototype are manufactured and tested to verify the theoretical analysis and simulation results.

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“…However, despite of mechanical constraints, effects of cogging torque and torque ripples are dominant which resulted pulsating instantaneous torque. Cogging torque and torque ripples are suppressed in [15] using various magnetic pole however in this technique, average torque reduced. Author [16] introduced spoke type rotor CP machine to maintain average torque but unfortunately core loss Furthermore, electromagnetic performances are degraded resulting reduction in torque and power densities [17].…”

Section: Introductionmentioning

confidence: 96%

Multi-objective optimization of high torque density segmented PM consequent pole flux switching machine with flux bridge

Ullah

Khan

Umair

2021

Trans. Electr. Mach. Syst.

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Due to double salient structure, Flux Switching Machines (FSMs) are preferred for brushless AC high speed applications. Permanent Magnet (PM) FSMs (PM-FSMs) are suited applicants where high torque density (Tden) and power density (Pden) are the utmost requisite. However conventional PM-FSMs utilizes excessive rare earth PM volume VPM, higher cogging torque Tcog, high torque ripples (Trip) and comparatively lower (Tden) and Pden due to flux leakage. To overcome the aforesaid demerits, a new high (Tden) Segmented PM Consequent Pole (CP) FSM (SPMCPFSM) with flux bridge and barrier is proposed which successfully reduces VPM by 46.52% and PM cost by 46.48%. Moreover, Multi-Objective Optimization (MOO) examines electromagnetic performance due to variation in geometric parameters for global optimum parameters with key metric such as flux linkage (Φpp), flux harmonics (ΦTHD) average torque (Tavg), Tcog, Trip, Tden, average power (Pavg) and Pden. Analysis reveals that MOO improve Φpp by 22.68%, boost Tavg by 11.41%, enhanced Pavg by 4.55% and increased Tden and Pden by 11.41%. Detailed electromagnetic performance comparison with existing state of the art shows that proposed SPMCPFSM offer Tavg maximum up to 88.8%, truncate Trip up to 24.8%, suppress Tcog up to 22.74%, and results 2.45 times Tden and Pden.

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Influence of Various Magnetic Pole on Electromagnetic Performance of Consequent-Pole Permanent Magnet Machine

Cited by 7 publications

References 19 publications

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Research on Segmented Primary Consequent-Pole Permanent Magnet Linear Synchronous Motor with Symmetric and Periodic End Force

Multi-objective optimization of high torque density segmented PM consequent pole flux switching machine with flux bridge

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