Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Interior permanent magnet synchronous motors (IPMSMs) have been widely used as traction motors in electric vehicles. Finite element analysis is commonly used to design IPMSMs but is highly time-intensive. To shorten the design period for IPMSMs, various surrogate models have been constructed to predict relevant characteristics, and they have been used in the optimization of IPMSM geometry. However, to date, no surrogate models have been able to accurately predict the characteristics over the wide speed range required for automotive applications. Herein, we propose a method for accurately predicting the speed-torque characteristics of an IPMSM by using machine learning techniques. To improve the prediction accuracy, we set the motor parameters as the prediction target of the machine learning methods. We then used the trained surrogate model and a real-coded genetic algorithm to minimize the volume of the permanent magnet and showed that the design time can be significantly reduced compared with the case where only finite element analysis is used.

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“…The value of ai is determined from the optimization problem in equation (4). In this study, we use a Gaussian kernel as the kernel function K.…”

Section:    mentioning

confidence: 99%

Using Machine Learning to Reduce Design Time for Permanent Magnet Volume Minimization in IPMSMs for Automotive Applications

et al. 2021

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“…with l st being the machine stack length and g the air gap. Using equations (18) to (20), a simple estimate for F m and F t can be given as…”

Section: B Consequent-pole Linear Vernier Hybrid Machinementioning

confidence: 99%

“…Since the higherorder field harmonics are mainly the source of pulsating flux and force, this indicates that the cogging and ripple forces of the CP LHVM would be greater than those of the SM LHVM. As discussed in the literature [7], [9], [18], [19], some techniques such as tapering the consequent-poles and translator teeth, are normally applied to reduce the flux leakage, mitigate the cogging/ripple forces, and provide a more sinusoidal induced EMF for CP LVHMs.…”

Section: Comparison Of the Sm And Cp Lvhmmentioning

confidence: 99%

Analytical Modeling of Surface-Mounted and Consequent-Pole Linear Vernier Hybrid Machines

et al. 2021

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This paper presents an analytical method for modelling the no-load air gap flux density of a surface-mounted and a consequent-pole linear Vernier hybrid machine (LVHM). The approach is based on simple magneto-motive force (MMF) and permeance functions to account for the doubly-slotted air gap of the LVHM. These models are used to determine the flux linkage, induced electromotive force (EMF) and average thrust force of each machine. The accuracy of the two analytical models is validated by comparison with 2D finite element method (FEM) solutions. Based on the analytical models, it is found that the working harmonics of both surface-mounted and consequent-pole LVHMs are essentially the same. However, the magnitudes of these working harmonics in the consequent-pole LVHM are invariably greater than those of surface-mounted LVHM. Further, using the analytical model, the contribution to the thrust force of the machine by each individual working harmonic can be shown clearly, and is used to explain why the consequent-pole LVHM has improved performance despite using only 50% of the permanent magnet (PM) material compared to the surface-mounted LVHM.

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“…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%

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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Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

Cited by 34 publications

References 42 publications

Using Machine Learning to Reduce Design Time for Permanent Magnet Volume Minimization in IPMSMs for Automotive Applications

Using Machine Learning to Reduce Design Time for Permanent Magnet Volume Minimization in IPMSMs for Automotive Applications

Analytical Modeling of Surface-Mounted and Consequent-Pole Linear Vernier Hybrid Machines

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

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