Design of Notches on Rotor Surface to Minimize Cogging Torque in Dual-Layered IPMSM by Optimizing Squared Gap Flux Density Waveform

2021 ◽  
Author(s):  
Marika Kobayashi ◽  
Shigeo Morimoto ◽  
Masayuki Sanada ◽  
Yukinori Inoue
Keyword(s):  
Flux Density ◽  
Cogging Torque ◽  
Rotor Surface

Performance Comparison between Surface-Mounted and Interior Brushless DC Motor

2013 ◽  
Vol 416-417 ◽  
pp. 133-138
Author(s):  
Nan Nan Zhao ◽  
Qian Yang ◽  
Ming Hui Zhang ◽  
Wei Guo Liu
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Eddy Current ◽  
Skin Effect ◽  
Performance Comparison ◽  
Brushless Dc Motor ◽  
Eddy Current Losses ◽  
Cogging Torque ◽  
Brushless Dc ◽  
Copper Loss

In this paper, the cogging torque, airgap flux density, back-emf, and losses of a surface-mounted and a hybrid magnetization interior brushless machines with the same stator, airgap width, armature core length, material, permanent magnet consumption, speed and copper loss are compared. The analysis reveals that the loss in rotor back iron of interior motor is higher than that in surface-mounted motor due to the skin effect while the eddy current losses in sleeve and magnets of surface-mounted motor are significant, causing the total losses of surface-mounted motor are higher than that of interior motor.

scholarly journals Optimization Analysis of Automotive Asymmetric Magnetic Pole Permanent Magnet Motor by Taguchi Method

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wenchao Zhang ◽  
Liwei Shi ◽  
Kaiwen Liu ◽  
Lintao Li ◽  
Jianning Jing
Keyword(s):  
Taguchi Method ◽  
Permanent Magnet ◽  
Flux Density ◽  
Magnetic Circuit ◽  
Harmonic Distortion ◽  
Air Gap ◽  
Total Harmonic Distortion ◽  
Initial Structure ◽  
Cogging Torque ◽  
Output Torque

In order to improve the air-gap flux density of the permanent magnet synchronous motor and reduce the cogging torque, a novel structure with asymmetric magnetic poles for automobile was proposed. Based on the characteristics of the parallel magnetic circuit, the magnetic flux path diagram is established. And the equivalent magnetic circuit model is established by the equivalent magnetic circuit method. The Taguchi method is used to be a multiobjective optimization algorithm. The total harmonic distortion of the air-gap flux density is the first optimization goal. The second and third optimization goals are the cogging torque and the average of output torque, respectively. And the torque ripple is a constraint condition. The optimized parameter combination is obtained by the Taguchi method. Finite element simulation analysis and prototype test are carried out for the optimized motor structure. The results show that the total harmonic distortion of air-gap flux density is reduced by 36.7% comparing with the initial structure. The cogging torque is reduced by 26.0%. And the average output torque is increased by 4.8%.

Cogging Torque Reduction by Means of Pole Segmentation Optimization on the Permanent Magnet Synchronous Machine

2020 ◽  
Author(s):  
Hugo E. Santos ◽  
Khristian M. de Andrade Jr. ◽  
Wellington M. Vilela ◽  
Geyverson T. de Paula
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Torque Ripple ◽  
Air Gap ◽  
Optimization Techniques ◽  
Machine Construction ◽  
Permanent Magnet Machines ◽  
Element Analysis ◽  
Cogging Torque ◽  
Main Component

One of the main obstacles during the design of permanent magnet machines consists in reducing the developed torque ripple characteristic of this type of machine. The main component of such ripples is a parasitic torque, called cogging torque. A technique present in the literature to reduce this parasitic torque considers the segmentation of the poles. This allows a decrease in the cogging torque, however reducing the air gap flux density too and thus the torque mean. Thus, in order to keep the torque mean reduction in reasonable levels, optimization techniques can be employed with the pole segmentation. The variables to be optimized are the number, distance and width of the segments. The present article proposes two methods to optimize these variables in order to minimize the cogging torque, but also maintain a satisfactory flux density value. Some constraints are added to account for the machine construction feasibility. The proposed methods were validated through a nite element analysis. The results proved the effectiveness of the proposed methods, with a reduction by up to 76% in the cogging torque and keeping, in the best case, about 95% of the reference machine air gap flux density and 78% in the worst one.

Optimum arrangement of PMs in surface-mounted PM machines: cogging torque and flux density harmonics

2020 ◽  
Vol 102 (3) ◽  
pp. 1117-1127 ◽  
Author(s):  
Vahid Zamani Faradonbeh ◽  
Samad Taghipour Boroujeni ◽  
Noureddine Takorabet
Keyword(s):  
Flux Density ◽  
Cogging Torque ◽  
Optimum Arrangement
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