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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (7): 1436-1446    DOI: 10.3785/j.issn.1008-973X.2022.07.019
    
Characteristic of air gap balanced hybrid excitation linear synchronous motor
Xiao-zhuo XU1(),Han DU1,Yang-yang ZHANG1,Hai-chao FENG1,Bao-yu DU2,*(),Shu-hua WANG3
1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
2. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China
3. School of Electrical Engineering , Shanghai Dianji University, Shanghai 200240, China
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Abstract  

A novel hybrid excitation linear motor was designed aiming at the problems of vibration, noise and wear between wheel and rail caused by uneven air gap in linear motor ropeless lifting system. The magnetic field and normal force were adjusted by changing the secondary current. Then the bilateral air gap was evenly adjusted to reduce the pressure between wheel and rail. The topology of new motor and the principle of air gap magnetic field adjustment were introduced. Then the influence of structural parameters on motor performance was analyzed, and the parameters of the prototype were determined. The regulation performance of secondary excitation current on normal force was analyzed under different load conditions. Then the effects of secondary DC excitation current on no-load back EMF and thrust were analyzed. Results show that the DC excitation has a significant effect on the normal force and has little effect on the thrust of the motor. The normal force changes linearly with DC excitation current under the same load condition. The regulation ability of DC excitation current to normal force decreases slightly when the load increases. The experimental results basically accorded with the finite element analysis, which verified the correctness of the theoretical analysis in this paper.

Key words： permanent magnet linear synchronous motor      magnetic field adjustment      hybrid excitation      normal force     
Received: 18 July 2021      Published: 26 July 2022
CLC:  TM 359  
Fund:  国家自然科学基金资助项目(52177039)；河南省科技攻关项目(222102220016，212102210145，222102210274)
Corresponding Authors: Bao-yu DU     E-mail: xxz@hpu.edu.cn;dbyhpu@163.com
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Xiao-zhuo XU
Han DU
Yang-yang ZHANG
Hai-chao FENG
Bao-yu DU
Shu-hua WANG
Cite this article:

Xiao-zhuo XU,Han DU,Yang-yang ZHANG,Hai-chao FENG,Bao-yu DU,Shu-hua WANG. Characteristic of air gap balanced hybrid excitation linear synchronous motor. Journal of ZheJiang University (Engineering Science), 2022, 56(7): 1436-1446.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.07.019     OR     https://www.zjujournals.com/eng/Y2022/V56/I7/1436


气隙调衡式混合励磁直线同步电机特性

针对直线电机无绳提升系统中因气隙不均匀引起的轮轨间振动、噪声和磨损等问题，设计新型的混合励磁直线电机. 通过改变次级励磁电流来调节双边气隙磁场和法向电磁力，进而调节双边气隙平衡，有效地降低轮轨间压力. 介绍新型电机的拓扑结构及气隙磁场调节原理，分析主要结构参数对电机性能的影响，确定样机的基本参数. 研究不同负载工况下次级励磁电流对法向电磁力的调节特性，分析次级励磁电流对直线电机空载反电势和电磁推力的影响. 研究结果表明，次级直流励磁电流对电机法向电磁力具有良好的调节能力，对电机推力输出基本没有影响. 在相同的负载工况下，法向电磁力随次级直流励磁电流基本呈线性变化. 当电机负载增大时，直流励磁电流对法向电磁力的调节能力略有降低. 实验结果与有限元分析结果基本吻合，验证了本文理论分析的正确性.


关键词： 永磁同步直线同步电机,  磁场调节,  混合励磁,  法向力 
Fig.1 Structure diagram of new hybrid excited double-sided linear motor
Fig.2 Sectional view of HES-LSM
Fig.3 Flux paths under different magnet-motive force
Fig.4 Force diagram of mover under DC excitation
参数 数值
初级槽宽wps/mm 16
初级槽高hps/mm 20
初级长度lp/mm 360
初级高度hp/mm 50
次级高度hs/mm 62
永磁宽度wpm/mm 8.5
次级凸铁宽wst/mm 14
直流绕组槽高hdc/mm 34
直流绕组槽宽wdc/mm 3.5
初级铁心叠厚d/mm 70
气隙长度g/mm 4
极距τ/mm 22.5
Tab.1 Structure parameters of HES-LSM
Fig.5 Basic size of HES-LSM
Fig.6 Back EMF of phase A (v = 1.035 m/s)
Fig.7 Harmonic analysis of back EMF
Fig.8 Detent force wave forms at different magnetization length of PM
Fig.9 Influence of DC excitation winding slot width and height on thrust
Wdc/mm FT/N Fr/% hdc/mm FT/N Fr/%
2.5 1365.18 2.56 20 1369.35 2.14
3.0 1363.41 2.75 18 1362.34 1.65
3.5 1360.16 1.79 17 1360.16 1.79
4.0 1358.80 1.41 16 1359.52 2.33
4.5 1362.18 2.00 14 1366.59 2.10
Tab.2 Influence of DC excitation winding slot width and height on thrust
Fig.10 Comparison of ρ and η before and after slotting
λ/(°) Δρ/% Δη/% λ/(°) Δρ/% Δη/%
0 0.86 4.98 60 2.11 0.69
10 0.16 6.44 70 1.78 0.19
20 1.76 3.93 80 1.32 0.15
30 2.29 2.56 90 1.60 0.23
40 2.41 1.74 100 1.82 0.21
50 2.32 1.12 — — —
Tab.3 Deviation ofρ and η under different power angles
Fig.11 Finite element model of HES-LSM
Fig.12 Variation of By under different air-gap shift
Fig.13 Variation of back EMF amplitude of phase A with air gap offset
Fig.14 Magnetic field distribution under different DC excitation current
Fig.15 Influence of DC excitation current on normal air-gap flux density (4 mm vs.4 mm)
Fig.16 Influence of air gap offset on normal force (Idc = 0)
Fig.17 Relationship between normal resultant force and DC excitation current under different air gap offset
Fig.18 Variation of back EMF under different Idc (v = 0.54 m/s)
Fig.19 Variation of normal resultant force with DC excitation current under different load angles
Fig.20 Variation of thrust and normal resultant force with different load angles under different DC excitation
Fig.21 Primary and secondary structure
Fig.22 Primary and secondary assembly diagram
Fig.23 Test platform of HES-LSM prototype
Fig.24 Comparison between test and simulation results of detent force (Wpm = 8.5 mm)
Fig.25 Comparison between test and simulation results of back EMF(v = 0.54 m/s)
Fig.26 Back EMF of phaseA under different DC excitation current
Fig.27 Effect of DC excitation current on primary current
Fig.28 Influence of air gap offset and DC excitation current on normal force
Fig.29 Influence of DC excitation current on thrust and normal force
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