CC BY
58
DOI 10.17816/transsyst201843s1156-164
© Y. Yang, J. Deng , L. Tong, X. Li, Q. Peng, W. Zhang
CRRC Zhuzhou Locomotive CO., LTD (Zhuzhou, China)
STUDY ON THE OPTIMIZATION OF LINEAR INDUCTION MOTOR TRACTION SYSTEM FOR FAST-SPEED MAGLEV TRAIN
Background: The short stator linear induction motor (LIM) is normally used in medium-low speed maglev train.
The restriction by mounting space on bogie and motor input voltage from the third power supply rail lead that the maximum speed of medium-low speed maglev train can reach no more than 120 km/h.
Aim: In this paper, by means of the LIM design optimization, improvement of the LIM force characteristic in high speed range, the maximum speed of medium-low speed maglev train can reach 160 km/h.
Methods: After comparing the LIM theoretical calculation and actual test data, it shows that the new designed LIM is effective.
Conclusion: Afterwards, by installing the new designed LIMs, the traditional medium-low speed maglev train becomes a fast-speed maglev train, and it has a bright future in transportation applications.
Keywords: linear induction motor, maglev train, medium-low speed, fast-speed, suspension bogie, traction system, F-shaped track, Changsha maglev express.
Till now, three maglev research and development groups in China have respectively built three 1.5~1.7 km long medium-low speed maglev engineering test line in Zhuzhou, ShanghaiandTangshan. All these three test trains on the three test lines use linear induction motors (LIM) with VVVF converter and control system. Due to the restriction of mounting space on the suspension bogie and motor input voltage (DC 1500V converted for 5 series connection motors), the maglev train can reach the highest limit speed about 100 km/h.
As China's first, the world's longest commercial short stator medium-low speed maglev line - Changsha maglev express was put into application in 2016, the medium-low speed maglev train with advantages of green, quiet and comfortable, strong climbing ability, small turning radius and low construction cost, reflects the strong adaptability to the environment and higher economy in city rail transportation
INTRODUCTION
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applications [1]. The Changsha maglev express as showed in Fig. 1 uses short stator linear induction motor (LIM, the structure is indicated in Fig. 2) to drive, since LIM with simple structure and no intermediate transmission device that can directly generate linear movement thrust, has been widely used in the fields of industry applications such as transportation, maglev train, subway / light rail train, piling machine, pumping device, electric vehicle door [2, 3]. Maglev train with no traditional wheel and rail, and the state of train operation, such as traction and braking, positive and reverse operation, is completely realized by linear motor frequency converter system. The main circuit of the traction system of maglev train consists of traction inverter, linear motor and corresponding control and detection circuit [4]. Due to the special structure of the maglev vehicle, the linear motor in the medium-low speed maglev train with the short length of air gap, terrible electromagnetic load, weight index of strict restrictions, leads to some difficulties for the design and manufacture. Generally, in order to achieve matched traction / braking characteristics, the speed of the maglev train resistance characteristics is calculated firstly, then, the related technical parameters and the design of single motor and traction inverter for obtaining the required traction power and traction characteristics are specified.
Many researches of the design and performance analysis of LIM have been done around the word, and in those researches also a lot of simulations and measurements are carried out [5, 6]. With some of those studies, the formation of improvement design of LIM have provided experience for faster speed applications.
For some application situations of urban or suburban, higher maximum speed maglev trains are expected, for example airport or satellite city connection
Beam
Fig. 1. The levitation and traction structure of medium-lowspeed maglev train
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Fig. 2. The primary and secondary parts of a LIM
to downtown. Therefore, a new LIM is specially proposed and realized to meet the higher speed requirement. Through optimization of the traction system including VVVF converter, the highest speed could reachup to 160 km/h according to theoretical calculation and actual comparison.
DESIGN OF THE NEW LIM FAST-SPEED MAGLEV TRAIN IN COMPARISON WITH THE ORIGINAL LIM FOR CHANGSHA MAGLEV EXPRESS
Tab.1 shows the main parameter and dimension of the LIM which is utilized in 160 km/h fast-speed maglev train and the LIM which is used in Changsha maglev express. The whole speed rang force calculation showed that with the new LIM the train has the ability to run up to 160 km/h.
Table 1. Design data and performance of the new LIM for Fast-speed Maglev Train and the original LIM for Changsha maglev express
Items Design Data Sign LIM of Fast-speed Maglev Train LIM of Changsha Maglev Express
Max.linevoltage (RMS) V 220 V 220 V
Max.primarycurrent 450 A 340 A
Perfor- Capacity S 170 kVA 130 kVA
mance Max.outputpower P m 48 kW 36 kw
Max.thrust F m 2800 N 3100 N
Max. speed v m 160 km/h 100 km/h
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Items Design Data Sign LIM of Fast-speed Maglev Train LIM of Changsha Maglev Express
Numberofphases m 3 3
Numberofpoles 2p 8 8
Polepitch t 225 mm 202.5 mm
Lengthofstator L 2020 mm 1820 mm
Thicknessofironcore H 220 mm 220 mm
Stator Heightofironcore d a 58 mm 58 mm
Parameter Overalldimensions 2020x600x110 mm 1820x580x101 mm
Numberofstatorslots 80 80
Windingconstruction doublelayerlapwinding doublelayerlapwinding
Wirematerials silk- silk-
coveredaluminiumwire coveredaluminiumwire
Coolingmethod Naturalwindcooling Naturalwindcooling
Speed (km/h)
Fig. 3. Traction characteristic curve of the original LIM for Changsha maglev express (calculation with constant slip frequency 13.7 Hz)
As can be seen from Fig. 5, 6 and Tab. 2, the new LIM has better performance of equivalent stress and deformation than the original LIM.
PRODUCTION AND INSTALLATION OF THE LIMS
Since the new LIM is only 200 mm longer than the original LIM, the suspension bogie size of Fast-speed maglev train is unchangeable with respect to Changsha maglev express. With consideration of the support wheel and skids, some incidental modifications of the new LIM has been carried out (Fig. 7, 8).
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3000 2500
s
£
a 2000 2
£ 1500
a a
1 1000 fa
H■
500
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Speed (km/h)
Fig. 4. Traction characteristic curve of the new LIM for Fast-speed maglev train (calculation with constant slip frequency 15 Hz)
AC: Static Structural
Equivalent Stress 2 Type: Equivalent (von-Mises) Stress Unit: MPa Time: 1
2017/8/10 8:36
AC: Static Structural
Total Deformation 2 Type: Total Deformation Unit: mm Tinne: 1
2017/8/10 8:42
0.12161 Max
0.10913 0.096656 0.08418 0.071703 0.05922 ~~ 0.0467 0.0M2 0.02 0Д09321 Min
Fig. 5. Equivalent stress and deformation calculations of the original LIM for Changsha maglev express (impact acceleration value 15 g)
AA: JX-130 Wi 15g
Equivalent Stress 2 Type: Equivalent (von-Mises) Stress Unit: MPa Tinne: 1
2017/8/9 20:53
I
168.08 Max
1494 130.73 112.05 93.38 74.706 56.032 37.3 18.68? 0.0090265 Min
AA:JX 130 15g
Total Deformation 2 Type: Total Deformation Unit: rnnn Time: 1
2017/8/9 20:54
0.11103 Max
0.10354 0.096046 0.088553 0.081061 0.073569 0.066077, 0.05É 0.05] 0.043601 Min
..........
.........
58585 gll* 5 ШЩ^
Fig. 6. Equivalent stress and deformation calculations of the new LIM for Fast-speed Maglev Train (impact acceleration value 15 g)
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Table 2. The Statistical results of equivalent stress and deformation
Model Max. Equivalent Stress (MPa) Max.Deformation (mm) Yield strength of material (MPa)
Theoriginal LIM 188 0.122 235
Thenew LIM 168 0.111 235
Table 3. The Statistical results of traction and breaking
Operation Items The new LIM The original LIM
Speed (km/h) Thrust (N) Speed (km/h) Thrust (N)
Start-up 0 2816 0 3105
Traction Turning point 70 2508 41 2920
Max. speed point 160 726 100 708
Turning point end 5 2820 5 3198
Breaking Turning point start 135 2744 85 3198
Max. speed point 160 1593 100 1938
Fig. 7. The Original LIM (1820 mm) Fig. 8. The New designed LIM (2020 mm)
The support wheels and skids of the Fast-speed maglev train are similar with the ones of Changsha Maglev Express, which are located by the end of the suspension bogie close to the end of the LIM windings (Fig. 9, 10).
The Fast-speed maglev train with the new LIMs is composed of 3 marshalling vehicles, andeach vehicleowns5suspension bogies. The input DC 1500 V is converted to alternative voltage and equally distributed tofive series connection LIMs. The maximum voltage foreach LIM is about AC 220 V. According to the propulsion calculation and whole-size model simulation with Finite Element Analysis (FEA), the maximum speed of the maglev train equipped with new LIMs is up to 160km/h, and the remainder acceleration value is 0.15 m/s2.
Received: 10.09.2018. Revised: 08.10.2018. Accepted: 17.11.2018. This article is available under license K-aeiWXHn
Transportation Systems and Technology. 2018;4(3 suppl. 1):156-164 doi: 10.17816/transsyst201843sll56-164
Fig. 9. The original suspension bogie applied in the Changsha Maglev Express
Fig. 10. The new designed suspension bogie for Fast-speed Maglev Train
CONCLUSION
The fast-speedmaglev train with three vehicles marshalling has been produced and tested on the Zhuzhoumedium-lowspeed maglev test line (Fig. 11) in the middle of 2018. The new designed LIMs' propulsion and suspension bogie dynamic performance weretotally verified, but due to the limitation that the length of test line is only 1.55 km, the maximum running speed was 70 km/h.
I
Received: 10.09.2018. Revised: 08.10.2018. Accepted: 17.11.2018. This article is available under license
Transportation Systems and Technology. 2018;4(3 suppl. 1):156-164 doi: 10.17816/transsyst201843sll56-164
Fig. 11. Zhuzhou Fast-speed maglev train with three vehicles marshalling (in 2018)
ACKNOWLEGEMENTS
This paper is supported by the National key Research and Development Plan (No. 2016YFB1200601).
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Information about the authors:
Yang Ying, Master, Professor Level Senior Engineer;;
ORCID: 0000-0002-3125-2126;
E-mail: 2560828867@qq.com
References
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Deng Jiangming, Doctor, Senior engineer; ORCID: 0000-0003-3450-2386; E-mail: senmingt@163.com
Tong Laisheng, Ph.D, Professor Level Senior Engineer; ORCID: 0000-0001-6905-5198; E-mail: alanatlsh@126.com
Li Xiaochun, Master, Senior engineer; ORCID: 0000-0001-6439-7711; E-mail: 6258755@qq.com
Peng Qibiao, Bachelor, Professor Level Senior Engineer; ORCID: 0000-0003-0082-4221; E-mail: pengqibi@sina.com
Zhang Wenhui, Master, Engineer; ORCID: 0000-0003-1739-8724; E-mail: 122784486@qq.com
To cite this article:
Yang Y, Deng J, Tong L, et al. Study on the Optimization of Linear Induction Motor Traction System for Fast-Speed Maglev Train. Transportation Systems and Technology. 2018;4(3 suppl. 1):156-164. doi: 10.17816/transsyst201843s1156-164
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