Electromagnetic Performance Analysis of Claw-Pole Alternator with Changing Permeance

2013 ◽  
Vol 668 ◽  
pp. 510-513
Author(s):  
Xiao Hua Bao ◽  
Mou Zhi Liu
Keyword(s):  
Magnetic Field ◽  
High Speed ◽  
Noise Analysis ◽  
Calculation Model ◽  
Air Gap ◽  
Field Analysis ◽  
Electromagnetic Properties ◽  
Magnetic Field Analysis ◽  
Field Distortion ◽  
Air Gap Magnetic Field

A changing air gap permeance model of the alternator and its influence were discussed in this paper. When the alternator was under high-speed operation, taking it into consideration that the claws getting deformation for rotating centrifugal force and electromagnetic exciting force, the alternator’s changing air gap permeance model was established. And the alternator’s Maxwell3D calculation model was built. The field magnetic distribution under the rated speed was obtained as well, also before the claws’ deformation was obtained. The harmonics of the air-gap flux were analyzed and compared. The changing air gap permeance model was proved to be reasonable. It would lead to air-gap magnetic field distortion of the generator, which affected the generator’s electromagnetic properties. Instruction was provided for more precise of air gap magnetic field analysis or vibration noise analysis of alternator.

Electromagnetic Field Analysis and Measurement for High Speed Attraction Type Magnetic Levitation Vehicle Systems

2005 ◽  
Vol 295-296 ◽  
pp. 655-660
Author(s):  
D.X. Chen ◽  
M.C. Pan ◽  
F.L. Luo ◽  
Z.W. Kang ◽  
W.G. Tian ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Speed ◽  
Magnetic Levitation ◽  
Experimental System ◽  
Air Gap ◽  
Field Analysis ◽  
The Finite Element Method ◽  
Magnetic Field Analysis ◽  
Vehicle Systems ◽  
The Magnetic Field

Research achievements in a high speed attraction type magnetic levitation vehicle experimental system are reported. The high speed attraction type magnetic levitation vehicle constitutes a typical long stator linear synchronous motor. The study on levitation and propulsive electromagnetic fields is of great importance and is studied. Owing to the influence of the stator grooves and the material discontinuousness, the magnetic field distribution is very complex to be analyzed in analytical forms. The magnetic fields in the air gap are determined using the finite element method. The levitation force and thrust produced by the levitation magnetic field and the propulsive magnetic field are calculated. They are found to vary following the change of the air gap and exciting current. A magnetic field strength measurement system based on a hall sensor is designed. Experimental results are compared with the results from the magnetic field analysis.

scholarly journals Magnetic field analysis of Primary Permanent Magnet Linear Motor Based on Halbach Distribution

2020 ◽  
Vol 204 ◽  
pp. 02012
Author(s):  
Xiuping Wang ◽  
Yan Li ◽  
Chuhan Yang ◽  
Chunyu Qu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Technical Problem ◽  
Linear Motor ◽  
Air Gap ◽  
Field Analysis ◽  
Transit System ◽  
Finite Element Software ◽  
Magnetic Field Analysis ◽  
Air Gap Magnetic Field

The rail transit system driven by linear motor has outstanding advantages in climbing ability, traction performance, vibration and noise. However, with the increase of traffic travel and other situations, how to ensure that the linear motor still has a large thrust and stability in the air gap condition is the key technical problem. In order to solve this problem, three Halbach permanent magnet array structures are proposed and applied to the magnetic barrier coupled primary permanent magnet unilateral excitation linear motor (MBCPPMUELM). The finite element software is used for simulation and analysis. By comparing the harmonic distribution of air gap magnetic field of the three Halbach permanent magnet array motors, a topology structure with high magnetic field modulation effect is obtained It provides a useful reference for the further design and analysis of this kind of motor.

Analytical Calculation Model of Air-Gap Magnetic Field for Claw Pole Machine with Outer PM Rotor

2012 ◽  
Vol 588-589 ◽  
pp. 463-466
Author(s):  
Guang Wei Liu ◽  
Feng Ge Zhang ◽  
Jin Xiang Gao
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
3D Structure ◽  
Analytical Calculation ◽  
Calculation Model ◽  
Air Gap ◽  
Field Analysis ◽  
Polar Coordinates ◽  
Element Analysis ◽  
Air Gap Magnetic Field

In view of the time consuming and sensitive to finite element meshes, the finite element method is not suitable for claw pole machine with outer permanent magnet rotors with complicated and asymmetric 3D structure. A new analytical calculation model based on air-gap magnetic field analysis in polar coordinates is proposed. According to boundary conditions, the radial and tangential flux density is obtained by using the Fourier’s series, and then the cogging torque and no load EMF is calculated. In order to verify the accuracy of the analytical method, the finite element analysis is finished. Moreover, one prototype is manufactured and measured also. The analytical results well agree with those obtained by the FEM and experiments, confirmed the feasibility of this method.

An improved conformal mapping method for magnetic field analysis in surface mounted permanent magnet motors

2017 ◽  
Vol 36 (4) ◽  
pp. 892-905
Author(s):  
Behrooz Rezaeealam ◽  
Farhad Rezaee-Alam
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Air Gap ◽  
Field Analysis ◽  
Magnetic Saturation ◽  
Content Type ◽  
Magnetic Field Analysis ◽  
Armature Reaction ◽  
Different Parts

Purpose The purpose of this paper is to present an improved conformal mapping (ICM) method that simultaneously considers the influence of relative recoil permeability of PMs, the armature reaction, the stator slotting, and the magnetic saturation on determination of the PM operating point in its different parts. Design/methodology/approach The ICM method is a time-effective method that considers the magnetic saturation by suitable increments in air-gap length under each tooth and also the width of slot openings. In this paper, the analytical and numerical conformal mappings such as the Schwarz-Christoffel (SC) mapping are used for magnetic field analysis due to the permanent magnets and the armature reaction in one slotted air gap. The field solution in the slotted air gap is obtained through the modulation of field solution in one slotless air-gap using the complex air-gap permeance. Findings The ICM method can consider the magnetic saturation in different electric loadings, and also the variation of PM operating points in its different parts. Practical implications The ICM method is applied to one surface mounted permanent magnet (SMPM) motor and is verified by comparing with the corresponding results obtained through finite element method (FEM), and frozen permeability finite element method (FP-FEM). Originality/value This paper presents an ICM method with a new technique for saturation effect modeling, which can be used to separate and calculate the on-load components of air-gap field and torque.

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.

scholarly journals Stator and rotor turn‐to‐turn fault detection in wound rotor induction machines based on the air‐gap magnetic field distortion

2020 ◽  
Vol 14 (13) ◽  
pp. 2631-2639
Author(s):  
Mohammad Hosein Nazemi ◽  
Farhad Haghjoo ◽  
Sergio Manuel A. Cruz ◽  
Davar Gallehdar
Keyword(s):  
Magnetic Field ◽  
Fault Detection ◽  
Induction Machines ◽  
Air Gap ◽  
Field Distortion ◽  
Air Gap Magnetic Field

scholarly journals Research air gap on electromagnetic field of high speed motor under the influence of air gap

2021 ◽  
Vol 2083 (2) ◽  
pp. 022089
Author(s):  
Qi Wang ◽  
Shiyu Xing ◽  
Jian Ma ◽  
Aoxiang Liu
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
High Speed ◽  
Field Model ◽  
Asynchronous Motor ◽  
Air Gap ◽  
Finite Element Software ◽  
Magnetic Field Model ◽  
Air Gap Magnetic Field ◽  
The Magnetic Field

Abstract High speed motor are mainly used in aerospace, petrochemical and NC machining fields. Complex electromagnetic field is distributed in the motor. With the continuous maturity of asynchronous motor technology, research on magnetic field has been rapidly developed. In this paper, the changes of air gap and magnetic field of high speed motor under different working conditions is introduced. The magnetic field model of high-speed motor with Maxwell electromagnetic which established theory through Ansoft finite element software. The distribution of electromagnetic field in the motor is explored. The results show that the magnetic field distribution of induction motor tends to increase with the increase of the air gap magnetic field. Therefore, this study has an important guiding significance for the motor.

Sign in / Sign up

Export Citation Format

Share Document