Analysis and Optimization Design of U-Shaped Ironless Permanent Magnet Linear Synchronous Motor

Longqi Zhang; Lei Zhao; Shihao Li

doi:10.62051/ijmee.v2n2.08

Authors

Longqi Zhang
Lei Zhao
Shihao Li

DOI:

https://doi.org/10.62051/ijmee.v2n2.08

Keywords:

Ironless Linear Motor, Air Gap Magnetic Field, Thrust Performance, Finite Element

Abstract

The working speed of the U-shaped ironless permanent magnet linear synchronous motor is determined by the frequency and pole pitch. When the motor’s working speed is required to be constant, different combinations of frequency and pole pitch can be chosen. This article mainly discusses the influence of the pole pitch on the motor performance when other parameters are kept constant. First, the magnetic field of the motor permanent magnet is analyzed using the equivalent magnetizing current method to discuss the relationship between the pole pitch and the motor air gap magnetic field. Then, the finite element method is used to analyze the influence of the pole pitch on the motor air gap magnetic field, transverse edge effect, and electromagnetic thrust considering the saturation effect of the magnetic yoke. The research shows that under the conditions of constant motor basic structural parameters and speed, and the same amount of permanent magnet material, both the air gap magnetic density and the motor thrust line density have maximum values as the pole pitch changes. The research results have certain guiding significance for the design of this type of motor.

References

LU Qinfen,SHEN Yiming,YE Yunyue. Development of permanent magnet linear synchronous motors structure and research [J]. Proceedings of the CSEE,2019,39(09): 2575-2588.

KANO Y, YOSHIAKI T, KOSAKA N, et al. Simple nonlinear magnetic analysis for permanent-magnet motors [J]. IEEE Transactions on Industry Applications,2005,41(5):1205-1214.

CAO Yongjuan, HUANG Yunkai, JIN Long. Design of axial-flux coreless permanent magnet brushless dc motor [J]. Journal of Southeast University (Natural Science Edition),2013,43(02):317-321.

MIN S G and SARLIOGLU B. Comparative study of coreless-type pm linear synchronous machines with non-overlapping windings[C]//Energy Conversion Congress and Exposition (ECCE). USA: IEEE,2017,4274-4281.

WANG Weitao,HUANG Yunkai,SONG Juncai,et al. Design and optimization of double layer reverse dip coil permanent magnet linear synchronous motors[J]. Proceedings of the CSEE,2020,40(03):980-989.

MEI Weihu, LU Qinfen. Comparative analysis of an air-core pmlsm with new double-layer windings[J]. micromotors, 2019,52(05):1-5+38.

QIU Shuheng,ZHANG Jie,SUN Xianbei,et al. Magnetic field optimization of u-type ironless permanent magnet linear motor using magnetic permeable block[C]// International Symposium on Linear Drives for Industry Applications (LDIA). China:IEEE,2021. 1-4.

DONG Fei, ZHAO Jiwen, ZHAO Jing, et al. Thrust ripple reduction of air-core permanent magnet linear synchronous motor based on arc shaping technique and taguchi method[C]// International Electric Machines & Drives Conference (IEMDC). USA: IEEE,2019. 1169-1174.

LI Liyi, TANG Yongbin, L IU Jiaxi. Design optimization of air-cored pmlsm with overlapping windings by multiple population genetic algorithm[J]. Proceedings of the CSEE,2013,33(15):69-77+14.

FERKOVA Z, FRANKO M, KUCHTA J, et al. Electromagnetic design of ironless permanent magnet linear synchronous motor[C]// International Symposium on Power Electronics. Italy: IEEE,2008. 721-726.

ISFAHANI A H, VAEZ-ZADEH S. Design optimization of a linear permanent magnet synchronous motor for extra low force pulsations[J]. Energy Conversion & Management,2007,48(2):443-449.

LI Zheng, ZHANG Jiazhen, WANG Qunjing. Magnetic field modeling and analysis of u-shaped ironless permanent magnet linear synchronous motor[J]. Electric Machines and Control Application,2018,45(02):75-80.

ZHANG Lu, KOU Baoquan, ZHAO Binchao, et al. A novel synchronous permanent magnet linear motor with halbach secondary structure[J]. Transactions of China Electrotechnical Society,2013,28(07):39-45.

MOHAMMADPOUR A. Winding factor calculation for analysis of back emf waveform in air-core permanent magnet linear synchronous motors[J]. Iet Electric Power Applications,2012,6(5):253-259.

VAEZ-ZADEH S, ISFAHANI A H. Multiobjective design optimization of air-core linear permanent-magnet synchronous motors for improved thrust and low magnet consumption[J]. IEEE Transactions on Magnetics, 2006, 42 (3):446-452.

MIN S G and SARLIOGLU B. 3-D Performance analysis and multiobjective optimization of coreless-type pm linear synchronous motors[J]. IEEE Transactions on Industrial Electronics,2017,65(2):1855-1864.