Thrust and normal force characteristics analysis of linear synchronous motor for direct drive conveyer

Issue title: Proceedings of the International Conference on Mechatronics and Information Technology (ICMIT 2005, ICMIT 2007)

Article type: Research Article

Authors: Zhu, Yu-wu^a | Lee, Sang-geon^a | Cho, Yun-hyun^{a; *}

Affiliations: [a] Power Electronics Application Lab. Dong-A University, Busan, Korea

Correspondence: [*] Corresponding author: Yun-hyun Cho, Complete Address: P3203, Power Electronics Application Lab., Dong-A University, Hadan 2-Dong, Saha-gu, Busan, 604-714, Korea. Tel.: +82 51 200 7742; Fax: +82 51 200 7743; E-mail: yhcho@dau.ac.kr

Abstract: The problem in improving the high positioning precision of permanent magnet linear synchronous motor (PMLSM) for direct drive conveyer is the large detent force, which contains two components: one is the cogging force caused by the interaction between the permanent magnet (PM) and the iron core, the other is the end effect caused by the finite mover length. In this paper a force compensator in the field oriented control (FOC) algorithm is employed to reduce this detent force, thus the thrust and the normal force characteristics analyses of PMLSM are of the most importance. First the characteristics of the thrust and the normal force are simulated by finite element method (FEM), and the relation of the thrust and the normal force to the q-axis current is analyzed. Then the components of detent force are defined by Fourier series using the curve fitting method, and compensated by injecting the instantaneous currents using the FOC method. Finally the dynamic characteristics of this PMLSM for direct drive conveyer are investigated, and the numerical results are reported to validate the effectiveness of this proposed method.

Keywords: Permanent magnet linear synchronous motor, detect force, field oriented control, thrust ripple, current compensation

DOI: 10.3233/JAE-2011-1342

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 36, no. 1-2, pp. 41-48, 2011