scholarly journals A Study on Core Skew Considering Manufacturability of Double-Layer Spoke-Type PMSM

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 610
Author(s):  
Dong-Woo Nam ◽  
Kang-Been Lee ◽  
Hyun-Jo Pyo ◽  
Min-Jae Jeong ◽  
Seo-Hee Yang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Permanent Magnet ◽  
Double Layer ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Element Analysis ◽  
Cogging Torque ◽  
The Core ◽  
The Difference

The spoke-type permanent magnet synchronous motor (PMSM), which is a general ferrite magnetic flux-concentrated motor, has a low portion of reluctance torque at the total torque magnitude. Therefore, as a way to increase the reluctance torque, there is a double-layer spoke-type PMSM that can maximize the difference in inductance between the d-axis and the q-axis. However, in the double-layer spoke-type PMSM, cogging torque, torque ripple, and total harmonic distortion (THD) increase with reluctance torque, which is the main cause of vibration and noise. In this paper, a method is proposed that provides the same effect as skew without dividing stages of the permanent magnet by dividing the core of the rotor into two types so that it is easy to manufacture according to the number of stages, unlike extant skew methods. Based on the method, the reduction in cogging torque and THD was verified by finite element analysis (FEA).

scholarly journals Reduction Design of IPMSM Torque Ripple using Design of Experimental

2021 ◽  
Vol 12 (6) ◽  
pp. 514-519
Author(s):  
Do-hyun Kim Et.al
Keyword(s):  
Factorial Design ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Maximum Speed ◽  
Analysis Model ◽  
Skew Angle ◽  
Element Analysis ◽  
Line Voltage ◽  
Cogging Torque

In the internal permanent magnet synchronous motor (IPMSM), torque pulsation occurs under no load. This is called cogging torque, and this causes noise and vibration during startup. Use factorial design, one of the experimental designs (DoE), to find the level of the factor with the lowest cogging torque and harmonic distortion (THD). The level of the found factor is applied to the analysis model. The main factors in factorial design are the skew step and skew angle. Based on the optimal factor level found through factor design, we compared the waveforms of torque ripple and line voltage at the maximum speed and the base speed of the analysis model and the model to which the skew was applied through finite element analysis (FEM). As the skew was applied, the harmonics were reduced, thereby reducing the torque ripple, and the line voltage waveform was also applied to the skew, resulting in a smoother waveform.

scholarly journals Design and Analysis of a Dual Airgap Radial Flux Permanent Magnet Vernier Machine with Yokeless Rotor

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2311
Author(s):  
Mudassir Raza Siddiqi ◽  
Tanveer Yazdan ◽  
Jun-Hyuk Im ◽  
Muhammad Humza ◽  
Jin Hur
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Permanent Magnet ◽  
Flux Linkage ◽  
Element Analysis ◽  
Cogging Torque ◽  
Torque Density ◽  
Stator Windings ◽  
Radial Flux ◽  
Torque Ripples

This paper presents a novel topology of dual airgap radial flux permanent magnet vernier machine (PMVM) in order to obtain a higher torque per magnet volume and similar average torque compared to a conventional PMVM machine. The proposed machine contains two stators and a sandwiched yokeless rotor. The yokeless rotor helps to reduce the magnet volume by providing an effective flux linkage in the stator windings. This effective flux linkage improved the average torque of the proposed machine. The competitiveness of the proposed vernier machine was validated using 2D finite element analysis under the same machine volume as that of conventional vernier machine. Moreover, cogging torque, torque ripples, torque density, losses, and efficiency performances also favored the proposed topology.

scholarly journals Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3887
Author(s):  
Jeong ◽  
Lee ◽  
Hur
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Component ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Cogging Torque ◽  
Maxwell Stress Tensor ◽  
The Finite Element Analysis ◽  
Harmonic Components

This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.

Electromagnetic Performance due to Tooth-tip Design in Fractional-slot PM Brushless Machines

2015 ◽  
Vol 6 (4) ◽  
pp. 860
Author(s):  
Mohd Luqman Mohd Jamil ◽  
Zulfikri Zaki Zolkapli ◽  
Auzani Jidin ◽  
Raja Nor Firdaus Raja Othman ◽  
Tole Sutikno
Keyword(s):  
Double Layer ◽  
Great Influence ◽  
Single Layer ◽  
Torque Ripple ◽  
Element Analysis ◽  
Cogging Torque ◽  
Torque Density ◽  
Iron Modification ◽  
Winding Machine ◽  
Electromagnetic Performance

Permanent Magnet (PM) machines are favorable as an alternative to other machine topologies due to simpler construction and high torque density. However, it may result hight torque ripple due to an influence of cogging torque and electronic commutation. In this paper, comparisons of phase back-emf, static torque and cogging torque due to influence of tooth-tip asymmetry in 12-slot/10-pole double-layer and 12-slot/10-pole single layer winding machines are carried out using 2D Finite-Element Analysis. At rated condition, the stator asymmetry has great influence on the torque performance as there is significant reduction of torque ripple in 12-slot/10-pole mahine equipped with single layer winding than one equipped with double layer winding machine. It si confirmed that an optimum torque performance is desirable via stator iron modification in PM machines.

Study on Low-Speed High-Torque PMSM for Surface-Drive System of Progressive Cavity Pump

2012 ◽  
Vol 516-517 ◽  
pp. 1643-1646
Author(s):  
Bing Yi Zhang ◽  
Shuai Wang ◽  
Gui Hong Feng ◽  
Xiang Cheng
Keyword(s):  
Finite Element Analysis ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Element Analysis ◽  
Low Speed ◽  
Linear Finite Element ◽  
Motor Design ◽  
Simulation And Experiment ◽  
High Torque ◽  
Fractional Slot Windings

This paper focus on a surface-mounted low-speed high-torque permanent magnet synchronous motor (PMSM) for progressive cavity pump wells. To minimize torque ripple, several methods is used such as proper pole-arc coefficient and fractional-slot windings. In the motor design, a non-linear finite element analysis (FEA) method is conducted to compute the performance of the motor. Through the simulation and experiment, the result shows that the design of low-speed high-torque PMSM is valid and presents a good performance.

Sign in / Sign up

Export Citation Format

Share Document