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Equivalent Circuit Model of Novel Solid Rotor Induction Motor with Toroidal Winding
Haichao Feng,Xu Cui,Jikai Si,Caixia Gao,Chun Gan 한국자기학회 2019 Journal of Magnetics Vol.24 No.4
Solid rotor induction motor (SRIM) is widely used in many fields due to its sturdy construction, low maintenance costs, and soft mechanical characteristic. A novel SRIM with toroidal winding (N-TWSRIM) is proposed and its equivalent circuit model (ECM) is established herein. The structure of N-TWSRIM is introduced and its operating principle is analyzed according to the movement of armature magnetic field at different times. The main structural parameters of N-TWSRIM are given, an equivalent circuit model is established to analyze performance of motor, and the results of ECM and two-dimension finite element model (FEM) are compared. Finally, to validate the correctness of operating principle and equivalent circuit model, a prototype of N-TWS-RIM has been built and experimented. It shows that the experimental results are consistent with the finite element and analytical results.
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Haichao Feng,Yaohua Guo,Xiaozhuo Xu,Caixia Gao,Liwang Ai 한국자기학회 2023 Journal of Magnetics Vol.28 No.4
In order to meet the demand of high-power density, high-precision positioning and low cost direct drive system in ropeless lifting, precision machining and other fields, the modular secondary structure with permanent magnet synchronous magnetization is adopted in this paper, and the secondary permanent magnet flux-switching linear machine (SPMFSLM) is proposed. Compared with the traditional primary permanent magnet fluxswitching linear machine (PPMFSLM), it reduces the thrust ripple and strengthens the primary structure. According to the topology and operation principle of the machine, starting from the air-gap magnetic field modulation principle and the convex tooth effect, the contribution of the air-gap flux density harmonics of the permanent magnet magnetic field and the armature magnetic field for the two machines to the average thrust is compared and analyzed, reflecting the similarities and differences between the two FSLMs in the thrust generation mechanism. In addition, the no-load characteristics for back-EMF and the thrust characteristics for two machines under equal load are calculated and compared. Finally, the multi-objective optimization of the key structural parameters of the machine is carried out by combining the response surface method (RSM) with the NSGAII algorithm. Then, the 3D simulation of the machine was carried out and cross-validated with the 2D results. Finally, a double-sided SPMFSLM (DS-SPMFSLM) is proposed from the practical point of view. The performance of DS-SPMFSLM is significantly superior to that of single-sided SPMFSLM, which verifies the advantages of the secondary permanent magnet structure scheme.
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Equivalent Circuit Based Design of an Integrated 2DoF Machine for Submerged Drilling Systems
Lujia Xie,Haichao Feng,Jikai Si,Yihua Hu,Kai Ni 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
Drilling is traditionally performed by multi-motor systems manually. However, the complex intermediate transmission mechanisms in the traditional design have large size and relatively low robustness. In this paper, a splitstator 2-degree-of freedom (2DoF) machine is applied. By conducting linear, rotary, and helical motion by only one machine, it provides a more compact, more integrated, more reliable, and stronger-adaptability electrically drilling machine for submerged drilling systems. On account of the adoption of the split-stator structure, the electromagnetic design of such 2DoF machine is a significant challenge. In this paper, a design method for the 2DoF machine with special split structure is proposed based on the electric decoupled equivalent circuit (EDEC). Then a 1.5 ㎾ 2DoF drilling machine is designed, and the electromagnetic performances are verified by the 3D finite element analysis (FEA). The results show the good characteristics and feasibility of applying the 2DoF machine in drilling systems.
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Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect
Jikai Si,Lujia Xie,Junbo Han,Haichao Feng,Wenping Cao,Yihua Hu 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
The two-degree-of-freedom direct drive induction motor, which is capable of linear, rotary and helical motion, has a wide application in special industry such as industrial robot arms. It is inevitable that the linear motion and rotary motion generate coupling effect on each other on account of the high integration. The analysis of this effect has great significance in the research of two-degreeof- freedom motors, which is also crucial to realize precision control of them. The coupling factor considering the coupling effect is proposed and addressed by 3D finite element method. Then the corrected mathematical model is presented by importing the coupling factor. The results from it are verified by 3D finite element model and prototype test, which validates the corrected mathematical model.
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Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect
Si, Jikai,Xie, Lujia,Han, Junbo,Feng, Haichao,Cao, Wenping,Hu, Yihua The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
The two-degree-of-freedom direct drive induction motor, which is capable of linear, rotary and helical motion, has a wide application in special industry such as industrial robot arms. It is inevitable that the linear motion and rotary motion generate coupling effect on each other on account of the high integration. The analysis of this effect has great significance in the research of two-degree-of-freedom motors, which is also crucial to realize precision control of them. The coupling factor considering the coupling effect is proposed and addressed by 3D finite element method. Then the corrected mathematical model is presented by importing the coupling factor. The results from it are verified by 3D finite element model and prototype test, which validates the corrected mathematical model.
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