Influence of inverter output voltage harmonic on surface-mounted permanent-magnet synchronous motor performance

2019 ◽  
Vol 43 (4) ◽  
pp. 515-525
Author(s):  
Hongbo Qiu ◽  
Yong Zhang ◽  
Cunxiang Yang ◽  
Ran Yi
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Permanent Magnet ◽  
Motor Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Air Gap ◽  
Transient Electromagnetic ◽  
Air Gap Magnetic Field

The application of an inverter is becoming more and more widespread in the surface-mounted permanent-magnet synchronous motor (SMPMSM). A large number of voltage harmonics can be generated by the inverter. The electromagnetic torque, loss, and air-gap magnetic density of the SMPMSM are affected by voltage harmonic. To analyze its influence, taking a 3 kW 1500 r/min SMPMSM as an example, a two-dimensional transient electromagnetic field model is established. The correctness of the model is verified by comparing the experimental data with the calculated data. Firstly, the finite element method is used to calculate the electromagnetic field of the SMPMSM, and the performance parameters of the SMPMSM are obtained. Based on these parameters, the influence of voltage harmonic on motor performance is analyzed quantitatively. Secondly, the influence of the voltage harmonic on the air-gap magnetic field is analyzed, and the influence degree of the time harmonic on the air-gap magnetic field is determined. At the same time, torque ripple, average torque, and loss are studied when the different harmonics orders, amplitudes, and phase angles are contained in voltage, and the variation is obtained. Finally, the variation mechanism of eddy current loss is revealed. The conclusion of this paper provides reliable theoretical guidance for improving motor performance.

Starting Performance of Novel Magnet Arrayed Permanent Magnet Synchronous Motor

2011 ◽  
Vol 383-390 ◽  
pp. 835-839
Author(s):  
Yue Jun An ◽  
Hong Liang Wen ◽  
Wen Qiang Zhao ◽  
Guo Ming Liu ◽  
Zhao Jun Meng
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Sine Wave ◽  
Synchronous Motor ◽  
Air Gap ◽  
Iron Core ◽  
Field Calculation ◽  
Air Gap Magnetic Field ◽  
Magnetic Poles

In order to improve the sinusoidal level of air gap magnetic field of the traditional surface PMSM, reduce its harmonic losses and fully reflect its energy-saving advantages, this paper introduces a type of sinusoidal pole width modulation permanent magnet synchronous motor. The surface magnetic poles of the rotor iron core constitute by a number of small array magnets, which makes the air gap magnetic field more sinusoidal. Placing starting winding in remaining space between array magnets of rotor outer surface to make surface-mounted permanent magnet synchronous motor add self-starting function. The sine wave distortion rate of air gap magnetic field of sinusoidal pole width modulation structure was compared with traditional surface-mounted structure by electromagnetic field calculation and experiment. The copper starting winding and aluminum starting winding were placed in sinusoidal pole width modulation structure motor respectively, and then the paper analyzes dynamic torque and rotational speed of self-starting progress. Finally the analysis is verified by experiments.

Torque ripple optimization for synchronous reluctance motors based on a virtual permanent magnet harmonic machine model

2021 ◽  
Vol 67 (3) ◽  
pp. 327-338
Author(s):  
Yixiang Xu ◽  
Chong Di ◽  
Xiaohua Bao ◽  
Dongying Xu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Torque Ripple ◽  
Air Gap ◽  
Analysis Model ◽  
Machine Model ◽  
Asymmetric Rotor ◽  
Rotor Flux ◽  
Air Gap Magnetic Field ◽  
Intermediate Variables

The torque ripple is affected by both the stator and the rotor magnetic field harmonics. In synchronous reluctance motors (SynRM), there are only rotor permeance harmonics existing on the rotor side for the absence of the rotor windings. Since the asymmetric rotor flux barriers are widely applied in the SynRM rotor, it is difficult to calculate the rotor permeance accurately by the analytical method. In this article, the effects of the rotor permeance harmonics on the air-gap magnetic field are studied by a virtual permanent magnet harmonic machine (VPMHM), which is a finite-element (FE) based magnetostatic analysis model. The air-gap flux density harmonics produced by the SynRM rotor are extracted from the VPMHM model and used as the intermediate variables for the torque ripple optimization. The proposed method does not need to solve the transient process of motor motion. Hence, the time of the optimization process can be significantly shortened. Finally, a full electric cycle is simulated by dynamic FE simulation, and the torque ripple is proved to be effectively reduced.

scholarly journals Magnetic Field Characteristics and Stator Core Losses of High-Speed Permanent Magnet Synchronous Motors

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 535 ◽  
Author(s):  
Dajun Tao ◽  
Kai Liang Zhou ◽  
Fei Lv ◽  
Qingpeng Dou ◽  
Jianxiao Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Core Loss ◽  
Load Condition ◽  
Synchronous Motor ◽  
Iron Core ◽  
Core Losses

This study focuses on the core losses in the stator region of high-speed permanent magnet synchronous motors, magnetic field characteristics in the load region, and variations in iron losses caused by changes in these areas. A two-pole 120 kW high-speed permanent magnet synchronous motor is used as the object of study, and a two-dimensional transient electromagnetic field-variable load circuit combined calculation model is established. Based on electromagnetic field theory, the electromagnetic field of the high-speed permanent magnet synchronous motor under multi-load conditions is calculated using the time-stepping finite element method. The magnetic field distribution of the high-speed permanent magnet synchronous motor under a multi-load condition is obtained, and the variations in iron core losses in different parts of the motor under multi-load conditions are further analyzed. The calculation results show that most of the stator iron core losses are dissipated in the stator yoke. The stator yoke iron loss under the no-load condition exceeds 70% of the total stator iron core loss. The stator yoke iron loss under rated operation conditions exceeds 50% of the total stator iron core loss. The stator loss under rated load operation conditions is higher than that under no-load operation. These observations are sufficient to demonstrate that the running status of high-speed motors is closely related to the stator iron losses, which have significance in determining the reasonable yoke structure of high-speed and high-power motors and the cooling methods of motor stators.

Optimization Design of Auxiliary Grooves on Rotor of Permanent Magnet Synchronous Motor for Electric Vehicles

2013 ◽  
Vol 467 ◽  
pp. 536-541
Author(s):  
Shu Wang Wang ◽  
Xu Tian ◽  
Chun Zhe Sun ◽  
Xiang Hong Ma
Keyword(s):  
Magnetic Field ◽  
Optimization Design ◽  
Permanent Magnet Synchronous Motor ◽  
Calculated Data ◽  
Torque Ripple ◽  
Air Gap ◽  
Time Stepping ◽  
Rotor Surface ◽  
Noise Vibration ◽  
Air Gap Magnetic Field

In order to reduce the influence of the harmonics of the air-gap magnetic field on PMSM performance, in this paper, the method which is to add auxiliary grooves in the rotor surface is proposed to optimize the air-gap magnetic field of PMSM and reduce the iron loss, torque ripple and noise-vibration caused by the harmonics. During the process, the orthogonal experimental method and the time-stepping FEM were used to optimize the structure of the grooves. Analyzed and compared the test-data and the calculated data,it shows that this method can largely improve motors performance.

The Influence of Second Air-Gap Length on the Performance of 10 kV, 1000 kW Permanent Magnet Synchronous Motor

2020 ◽  
Vol 14 ◽  
Author(s):  
Xianghong Cao ◽  
Yanan Xu ◽  
Junfeng Sun ◽  
Honbo Qiu
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Steady State ◽  
Permanent Magnet ◽  
Power Factor ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Air Gap ◽  
Element Calculation ◽  
Electrodynamic Force

Background: The influence of the second air-gap length on the performance of permanent magnet synchronous motor is usually ignored. A comparative analysis is made of line-start high-voltage permanent magnet synchronous motor in this paper. Objective: The purpose of this paper is to analyze the influence of the second air-gap length on the motor performance. Methods: A 10kV 1000kW permanent magnet synchronous motor is taken as an example and the model is established based on the finite element calculation method when the second air-gap length is different. The influence of the second air-gap length on the phasor diagram, no-load back electrodynamic force, starting performance and steady-state operation performance are studied. Based on the finite element calculation method, the torque angle, current, power factor, external power factor and d/q-axis current of the motor are analyzed, and the change of the motor phasor diagram is obtained. The influence of the second air-gap length on the no-load back electrodynamic force is studied. Results and Conclusion: The relationship between the no-load back electrodynamic force and the no-load air-gap fundamental magnetic field is determined, and the influence mechanism of the no-load air-gap fundamental magnetic field on no-load back electrodynamic force is revealed. Furthermore, the influence of the no-load back electrodynamic force on the starting performance is studied. Finally, the influence of the second air-gap length on the 10kV 1000kW permanent magnet synchronous motor steady-state performance is obtained. Based on the above analysis, some references are given for the design of motor.

Air-Gap Magnetic Field Optimization to Reduce Losses in High Speed Bearingless Permanent Magnet Synchronous Motor

2013 ◽  
Vol 387 ◽  
pp. 360-364
Author(s):  
Tao Zhang ◽  
Hong Yun Jia ◽  
Hui Ping Zhang ◽  
Jian Xiang Ji
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Magnetic Bearing ◽  
Air Gap ◽  
Time Stepping ◽  
Bearing Unit ◽  
Halbach Array ◽  
Air Gap Magnetic Field

In this paper, the high speed motor hybrids with a radial-axial 3 degree of freedom hybrid magnetic bearing unit and BPMSM unit is proposed. The radial suspension force and magnetic field distributions with different magnetized mode are calculated. The losses are calculated and compared using time-stepping finite element method. The research results have shown that the high-speed BPMSM with Halbach array permanent magnet rotor has sinusoidal air-gap magnetic field, minimum losses.

Influence of Wye-and Delta-Connected Winding on the Performance of Line Start Permanent-Magnet Synchronous Motor

2018 ◽  
Vol 19 (6) ◽  
Author(s):  
Hongbo Qiu ◽  
Kaiqiang Hu ◽  
Cunxiang Yang
Keyword(s):  
Finite Element Method ◽  
Electromagnetic Field ◽  
Permanent Magnet ◽  
Motor Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Calculation Model ◽  
Two Dimensional ◽  
On Line ◽  
The Difference

Abstract In order to obtain the influence of wye (Y)-and delta ( \Delta)-connected winding on line start permanent magnet synchronous motor (LSPMSM), taking a 15 kW LSPMSM as an example, the two dimensional (2-D) finite element method (FEM) and analytical method are used to calculate the motor performance. The influence of 3rd harmonic current in \Delta-connected winding on the motor electromagnetic field is analyzed. The difference of the losses and capacity of starting and overload between the Y- and \Delta-connected winding are studied. Finally, combined with the related experiments, the correctness of the calculation model is verified and the reliability of the research results are proved.

Three-Dimensional Magnetic Field Analysis of Poly-Magnet Line-Start Permanent Magnet Synchronous Motor

2012 ◽  
Vol 229-231 ◽  
pp. 895-898
Author(s):  
Yue Jun An ◽  
Dong Xu Pei ◽  
Li Ping Xue ◽  
Yong Li
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Three Dimensional ◽  
Synchronous Motor ◽  
Air Gap ◽  
Field Analysis ◽  
Cast Aluminum ◽  
Limited Space ◽  
Magnetic Field Analysis

In order to solve the existing permanent magnet synchronous motor starting from starting performance and energy target fight between rotor and limited space of conflict. The line-start permanent magnet synchronous motor with the special structure of the disk magnet polyed magnetic type has been proposed. Motor rotor punching trough, size, and cast aluminum material can give full consideration to the requirements of line-start function in the new type of permanent magnet synchronous motor. polymer magnets which is formed from alternating magnetic yokes and permanent magnetic ring is set between the hinge and the rotor part; Interval set on the outer circle of magnetic yoke take the magnetic flux to pole. Air-gap flux density can be achieved highly by utilized to set up the starting winding after the rest of the limited space in the poly magnet structure. By finite electromagnetic field analysis software Ansoft, Three-dimensional magnetic field can be analyzed in Poly-Magnet Line-start Permanent Magnet Synchronous Motor. The result show that poly magnet structure improves the air gap magnetic field strength; Under the premise of better starting capability, it can improve the power index of motor.

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