Non-uniform air gap modeling and electromagnetic characteristics of a new six-phase doubly salient electro-magnetic generator

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1325-1335
Author(s):  
Xiaoyu Zhou ◽  
Liwei Shi ◽  
Junhao An ◽  
Fukang Ding
Keyword(s):  
Finite Element ◽  
Linear Structure ◽  
Mutual Inductance ◽  
Air Gap ◽  
Electromagnetic Properties ◽  
Element Analysis ◽  
Doubly Salient ◽  
Electro Magnetic ◽  
Magnetic Generator ◽  
Gap Structure

The voltage harmonics of the six-phase doubly salient electro-magnetic generator (DSEG) are large, and the electromagnetic isolation is poor due to the mutual inductance of the armature winding. An optimization scheme for the stator non-uniform air gap structure is proposed. By establishing a non-uniform air gap angle function model, the analytical expression of the induced electromotive force in the non-uniform air gap structure is derived. Using finite element and mathematical model to verify that the stator tip is changed from circular arc to linear structure can increase power and reduce voltage high harmonics, improve the power quality of the generator. Based on the equivalent magnetic circuit, the influence of the winding method of the excitation winding on the mutual inductance of the armature winding is studied. When the field winding is wound interval every two stator poles, the mutual inductance is small. The electromagnetic properties of the new six-phase electric excitation double salient pole are analyzed by two-dimensional finite element analysis. The rationality of the proposed motor structure is verified by experiments.

Analysis of Design Parameter Sensitivity of On-Off Shift Solenoid Valve

2014 ◽  
Vol 998-999 ◽  
pp. 582-586 ◽  
Author(s):  
Fei Huang ◽  
Chun Yang Wang ◽  
Yu Bo Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electromagnetic Force ◽  
Orthogonal Experiment ◽  
Solenoid Valve ◽  
Air Gap ◽  
Design Parameters ◽  
Analysis Software ◽  
Element Analysis ◽  
Orthogonal Experiment Design

The parameters of the On-off shift solenoid valve are analyzed by finite element analysis software Ansoft and orthogonal experiment design. What’s more, the design parameters of the on-off shift solenoid valve can be optimized by analysis of the data of the orthogonal table. The result shows that the voltage influences the electromagnetic force the most, the air gap comes second and the number of turns is the minimum. We find that the force increases with the growth of voltage and the number of turns, but it is opposite to the air gap.

scholarly journals Topology Comparison Study of Five-Phase Wound-Field Doubly Salient Fault Tolerant Generators

2019 ◽  
Vol 9 (10) ◽  
pp. 2112 ◽  
Author(s):  
Liwei Shi ◽  
Junhao An ◽  
Wenchao Zhang
Keyword(s):  
Finite Element ◽  
Fill Factor ◽  
Simulation Analysis ◽  
Fault Tolerant ◽  
Finite Element Models ◽  
Element Analysis ◽  
Split Ratio ◽  
Doubly Salient ◽  
Rotor Pole ◽  
Electro Motive Force

To present the characteristics of pole number and pole shape of the core, the five-phase wound-field doubly salient generators (WFDSGs) with symmetric phase inductance are studied and optimised in this paper, considering the split ratio, slot fill factor and core fringing effect. Based on the principle and structure of the five-phase WFDSGs, the winding induced electro-motive force under different number of poles is theoretically analysed. The constraints for parameter optimisation design including slot fill factor, split ratio and magnetic density characteristic are given. The finite element models of 30/24-pole and 20/16-pole WFDSG are established, and the comparative simulation analysis is carried out. It is pointed out that when the inner and outer diameters of the stator and rotor, the axial length and the maximum magnetic density are constant, the induction electromotive forces of the WFDSGs with different pole numbers and same phase coil number are same. Considering the pole fringing effect, the rotor pole equivalent width is the sum of the rotor pole actual width and 4 times of the air gap. The comparison experiments between the 30/24-pole and 20/16-pole WFDSGs were carried out, which verified the correctness of the theoretical analysis and finite element analysis (FEA).

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