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.

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.

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.

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.

Effect of magnetic slot wedge on the performance of bulb tubular turbine generator

2020 ◽  
Vol 39 (4) ◽  
pp. 915-925
Author(s):  
Hongbo Qiu ◽  
Xutian Zou ◽  
Xiaobin Fan
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Negative Impact ◽  
Torque Ripple ◽  
Air Gap ◽  
Turbine Generator ◽  
Content Type ◽  
Pole Structure ◽  
Air Gap Magnetic Field ◽  
Generator Performance

Purpose Owing to the salient pole structure and stator slots of hydro-generator, the air gap magnetic field in the generator is unevenly distributed. High-frequency harmonic components contained in the inhomogeneous air gap magnetic field will have a negative impact on the generator performance. The purpose of this paper, therefore, is to improve the distribution of air gap magnetic field by using appropriate magnetic slot wedge, thereby improving the generator performance. Design/methodology/approach Taking a 24 MW, 10.5 kV bulb tubular turbine generator as an example, the 2 D electromagnetic field model of the generator is established by finite element method. The correctness of the model is verified by comparing the finite element calculation data with the experimental data. The influences of the permeability and thickness of the magnetic slot wedge on the generator performance are studied. Findings It is found that the intensity and harmonic content of the air gap magnetic field will change with the permeability of slot wedge and then the performance parameters of the generator will also change nonlinearly. The relationship between the eddy current loss, torque ripple, output voltage and other parameters of the generator and the permeability of slot wedge is confirmed. In addition, the variation of losses and torque with wedge thickness is also obtained. Originality/value The influence mechanism of magnetic slot wedge on the performance of hydro-generator is revealed. The presented results give guidelines to selecting suitable magnetic slot wedge to improve generator performance.

Optimized Design of Permanent Magnetic Stage Based on Simplex Method

2011 ◽  
Vol 467-469 ◽  
pp. 1333-1338
Author(s):  
Yi Zhang ◽  
Dong Hong Tang ◽  
Hui Zhi Sun
Keyword(s):  
Magnetic Field ◽  
Simplex Method ◽  
Optimization Design ◽  
Magnetic Parameter ◽  
Air Gap ◽  
Step Response ◽  
Optimized Design ◽  
Optimization Function ◽  
Operational Factors ◽  
Air Gap Magnetic Field

Because the thrust and suspend stability is related to sine level of air gap magnetic field, so the sine level of air gap magnetic field is the point of it’s operational factors, proposed a optimization function of magnetic field based on the simplex method, and the optimization design of the stage is established. The main magnetic parameter is assured, and step response is attached, the result is expressed that the magnetic stage is finished the nm position requirements.

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.

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