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.

scholarly journals Design and fault tolerant analysis of five-phase permanent magnet synchronous motor

2019 ◽  
Vol 16 (3) ◽  
pp. 1115
Author(s):  
Ahmad Sofian Saari Saari ◽  
Dahaman Ishak
Keyword(s):  
Permanent Magnet ◽  
Analytical Method ◽  
Electric Propulsion ◽  
Fault Tolerant ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Acceptable Error ◽  
Cogging Torque

<span lang="EN-IN">This paper presents a design of 15-slot/12-pole, five-phase, surface-mounted permanent magnet synchronous motor (PMSM).  The five-phase PMSM can be an attractive solution to few applications that demand fault tolerant capability such as in aerospace engineering and electric propulsion. The motor model is first investigated based on the implementation of analytical method. The analytical method derived from the subdomain model of the permanent magnet machine is initially applied to estimate the magnetic flux density distributions for the radial component <em>B</em><sub>r</sub> and the tangential component <em>B</em><sub>t</sub> in the machine air gap. Other important motor characteristics such as phase back-EMF, line back-EMF, cogging torque and electromagnetic torque are also calculated. The analytically calculated results are then compared with the numerical method in a 2D finite element analysis. Additionally, the capability of this PMSM model against faulty conditions are further investigated. The results show that the analytical model of the 15-slot/12-pole, five-phase PMSM provides very accurate motor performance within acceptable error margin. For instance, the average electromagnetic torques, inclusive of the cogging torque, as computed by the analytical and numerical methods are 5.53Nm and 5.33Nm respectively, yielding an error of 3.6%. During faulty conditions, the PMSM can possibly continue to operate with lower output torque, about 60% to 80% of its rated torque, when one-phase or two phase windings are out of service.</span>

scholarly journals Suppression of Cross-Coupling Effect of Hybrid Permanent Magnet Synchronous Motor with Parallel Magnetic Circuit

2021 ◽  
Vol 13 (1) ◽  
pp. 11
Author(s):  
Xiao He ◽  
Guangqing Bao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Coupling Effect ◽  
Permanent Magnet Synchronous Motor ◽  
Cross Coupling ◽  
Synchronous Motor ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Cross

Hybrid permanent magnet synchronous motor (HPMSM) has attracted increased attention in recent years due to its adjustable air gap flux. However, as a result of the cross-coupling effect of high- and low-coercive permanent magnets, the precise magnetic adjustment of HPMSM has become increasingly difficult. In order to weaken the cross-coupling effect, two methods of adding magnetic barrier and exciting coil are adopted in this paper. First, the equivalent magnetic circuit model is established, and the theoretical rationality of the weakening method is analyzed. Second, the electromagnetic performance of two weakening methods are analyzed based on the finite element analysis. Finally, the rationality of the theoretical analysis is verified, which provides the structure basis for the precise magnetic adjustment of the hybrid permanent magnet motor.

scholarly journals A DIFFERENT APPROACH IN OPTIMUM DESIGN PROCESS AND FEA VALIDATION OF LOW-SPEED MULTI-PHASE IPMSMS

2017 ◽  
Vol 18 (1) ◽  
pp. 133-145
Author(s):  
Seyed Asghar Gholamian ◽  
Hamid Reza Gholinejad
Keyword(s):  
Permanent Magnet ◽  
Ant Colony Algorithm ◽  
Permanent Magnet Synchronous Motor ◽  
Design Procedure ◽  
Volume Ratio ◽  
Magnetic Flux Density ◽  
Permanent Magnet Motors ◽  
Element Analysis ◽  
Interior Permanent Magnet ◽  
Dimensional Finite Element

Magnets placement effects on permanent magnet motors performance, because of its different magnetic flux density distribution. Therefore, different types of magnet placement should be examined experimentally or by valid simulations. In this paper, first, an interior permanent magnet synchronous motor (IPMSM) called spoke type with specifications related to the propulsion of ships is designed and then optimized by ant colony algorithm to increase the torque-to-volume ratio. The design procedure and its formulas presented as simple as possible. Then, to verify the optimization results of the optimized motor, a Two-dimensional finite element analysis (FEA) is done. Also in this analyze the core and the slot saturation was studied.

Research on Starting Process of a Novel Wound Rotor Line-Start Permanent Magnet Synchronous Motor

2011 ◽  
Vol 383-390 ◽  
pp. 1825-1830
Author(s):  
Gui Hong Feng ◽  
Shuang Li ◽  
Min Zhao ◽  
Bing Yi Zhang
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Difficult Problem ◽  
Element Analysis ◽  
Squirrel Cage ◽  
The Finite Element Analysis ◽  
Starting Conditions ◽  
Starting Process ◽  
Cage Rotor

Squirrel-cage rotor line-start permanent magnet synchronous motor can not meet the heavy lifting, frequent starting conditions for the lifting requirements. In order to solve the difficult problem of starting caused by the squirrel-cage rotor line-start permanent magnet synchronous motor (LS-PMSM), a novel wound rotor line-start permanent magnet synchronous motor is proposed in this paper, which uses wound rotor to replace squirrel cage rotor. In this paper, the finite element analysis method is adopted to simulate and analyze the starting process of the motor, through reasonably determining the value of the external rotor resistance, the starting performance of the motor has improved greatly, and lead the motor smoothly into synchronous speed. The simulation results show the correctness and effectiveness of the research methods.

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 Torque Ripple Minimization of the Permanent Magnet Synchronous Machine by Modulation of the Phase Currents

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2406 ◽  
Author(s):  
Cezary Jędryczka ◽  
Dawid Danielczyk ◽  
Wojciech Szeląg
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Numerical Models ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Minimization Method ◽  
Element Analysis ◽  
Current Harmonics ◽  
Wide Range ◽  
Zero Sequence

This paper deals with the torque ripple minimization method based on the modulation of the phase currents of the permanent-magnet synchronous motor (PMSM) drive. The shape of the supply current waveforms reducing the torque ripple of the machine considered was determined on the basis of finite element analysis (FEA). In the proposed approach, the machine is supplied by a six-leg inverter in order to allow for the injection of zero sequence current harmonics. Two test PMSMs with fractional-slot concentrated windings (FSCW) and surface-mounted permanent magnets (SPMs) have been examined as a case study problem. Wide-range fractional analyses were performed using developed numerical models of the electromagnetic field distribution in the considered machines. The results obtained show that the level of torque ripple in FSCW PMSMs can be effectively reduced by the modulation of the phase currents under the six-leg inverter supply.

Optimal design of a surface-mounted permanent magnet motor with multi-grade ferrite magnets to reduce torque pulsations

2020 ◽  
Vol 64 (1-4) ◽  
pp. 79-89
Author(s):  
Yan Liu ◽  
Wenliang Zhao ◽  
Xue Fan ◽  
Xiuhe Wang ◽  
Byung-il Kwon
Keyword(s):  
Optimal Design ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Kriging Method ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Cogging Torque ◽  
The Finite Element Analysis ◽  
Torque Pulsations ◽  
Flux Density Distribution

This paper proposes an optimal design for a surface-mounted permanent magnet motor (SPMM) to reduce torque pulsations, including cogging torque and torque ripple, by using multi-grade ferrite magnets. Based on a conventional SPMM with single-grade ferrite magnets, the proposed SPMM is designed with four-grade ferrite magnets and then optimized to minimize torque pulsations by maintaining the required torque, utilizing the Kriging method and a genetic algorithm. The results obtained by the finite element analysis show that the optimized SPMM with multi-grade ferrite magnets exhibits improved airgap flux density distribution with highly reduced cogging torque and torque ripple by maintaining the same average torque, as compared to the conventional SPMM. Furthermore, the analysis of the working points for the multi-grade ferrite magnets reveals that the optimized SPMM has good durability against the irreversible demagnetization.

Optimal Design of High Power Linear Permanent Magnet Synchronous Motor for Aircraft Launch

2012 ◽  
Vol 455-456 ◽  
pp. 1160-1168
Author(s):  
Shuang Hui Hao ◽  
Zi Li Tang ◽  
Rui Zheng Long ◽  
Ming Hui Hao
Keyword(s):  
Permanent Magnet ◽  
High Power ◽  
Permanent Magnets ◽  
Structural Parameters ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Analysis Method ◽  
Element Analysis ◽  
Flexible System ◽  
Finite Element Analysis Method

Design optimization and analysis of the high power linear permanent magnet synchronous motor for aircraft launch are presented in this paper. This motor has a decentralized stator that runs the entire length of travel. A plate with an array of permanent magnets is used as the secondary. This structure enables easier manufacture, flexible system assembling, and autonomous decentralized control employed for energy saving. The thrust and cogging force of the motor are highly affected by the motor structural parameters. The influences of these structural parameters on the thrust and cogging force are analyzed by finite element analysis method; experiment studies are carried out to support the theoretical analysis.

Microstructure Design of Surface Permanent Magnet and Tooth Surface Stator in Brushless DC Motor with Low Rare Earth Material

2013 ◽  
Vol 479-480 ◽  
pp. 427-430
Author(s):  
Hsing Cheng Yu ◽  
Bo Syun Yu
Keyword(s):  
Rare Earth ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Structure Design ◽  
Tooth Surface ◽  
Magnetic Flux Density ◽  
Cogging Torque ◽  
Brushless Dc ◽  
Earth Material

Permanent magnet (PM) brushless DC motors (BLDCMs) are widely applied in industrial drives. However, the price rising of rare earth resource resulted in country policy restriction, so it is detrimental for mass production of PM-BLDCMs. As a result, the design and manufacture tendency of PM-BLDCMs are smaller and slighter in adopting rare earth materials of PMs. Additional, the magnetic flux density of PMs are difficult to improve in the near future. The effective method is to decrease stator reluctance and to adjust magnetic flux distribution of the air gap in stator design. Hence, the surface permanent magnets (SPMs) and tooth surface stators (TSSs) are designed to improve the motor performance, and are calculated by finite-element analysis (FEA) software in this study. Various hemicycle groove microstructures of SPMs and TSSs for designing, analyzing and optimizing are considered to observe the magnetic field strength distribution and to reduce the cogging torque in PM-BLDCMs, and the FEA result can be regarded as important references of motor structure design. The cogging torque can be reduced 80.9% in SPM3-model and can be decayed 89.2% in TSS2-model versus original model separately, and the cogging torque of the optimal combination of SPM-BLDCM can be abated 62.4%. Furthermore, the usage amount of rare earth material volume in designed SPM-BLDCMs can be reduced 5.3% in average. Finally, a prototype of the SPM- BLDCM has been constructed to prove the simulation design.

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