System construction of a four-side primary permanent-magnet linear motor drive mechanical press

doi:10.1007/s11465-020-0597-z

Front. Mech. Eng.

2020, Vol. 15

Issue (4) : 600-609 https://doi.org/10.1007/s11465-020-0597-z

RESEARCH ARTICLE

System construction of a four-side primary permanent-magnet linear motor drive mechanical press

Jintao LIANG(

), Zhengfeng MING, Peida LI

School of Mechano-Electronic Engineering, Xidian University, Xi’an 710071, China

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Abstract

A primary permanent-magnet linear motor (PPMLM) has a robust secondary structure and high force density and is appropriate for direct-drive mechanical press. The structure of a four-side PPMLM drive press is presented based on our previous research. The entire press control system is constructed to realize various flexible forming processes. The control system scheme is determined in accordance with the mathematical model of PPMLM, and active disturbance rejection control is implemented in the servo controller. Field-circuit coupling simulation is applied to estimate the system’s performance. Then, a press prototype with 6 kN nominal force is fabricated, and the hardware platform of the control system is constructed for experimental study. Punch strokes with 0.06 m displacement are implemented at trapezoidal speeds of 0.1 and 0.2 m/s; the dynamic position tracking errors are less than 0.45 and 0.82 mm, respectively. Afterward, continuous reciprocating strokes are performed, and the positioning errors at the bottom dead center are less than 0.015 mm. Complex pulse trajectories are also achieved. The proposed PPMLM drive press exhibits a fast dynamic response and favorable tracking precision and is suitable for various forming processes.

Keywords mechanical press direct drive primary permanent-magnet linear motor (PPMLM) servo system active disturbance rejection control (ADRC) prototype experiment

Corresponding Author(s): Jintao LIANG

Just Accepted Date: 08 September 2020 Online First Date: 16 October 2020 Issue Date: 02 December 2020

Cite this article:

Jintao LIANG,Zhengfeng MING,Peida LI. System construction of a four-side primary permanent-magnet linear motor drive mechanical press[J]. Front. Mech. Eng., 2020, 15(4): 600-609.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-020-0597-z
https://academic.hep.com.cn/fme/EN/Y2020/V15/I4/600

Fig.1 Structure of the four-side PPMLM drive press: (a) Magnified view and (b) front sectional view.

Fig.2 Electromagnetic characteristics of PPMLM: (a) No-load EMF, (b) electromagnetic force, (c) force–current ratio.

Fig.3 Winding connection of the four PPMLMs: (a) Parallel connection, (b) series connection, and (c) series–parallel connection.

Fig.4 Schematic of the entire drive system.

Fig.5 Schematic of a linear active disturbance rejection control.

Fig.6 Field-circuit coupling simulation results. (a) Punch speed, (b) LESO output y₃, and (c) output force.

Fig.7 6 kN prototype of the four-side PPMLM drive press.

Fig.8 Servo control system of the four-side PPMLM drive press.

Fig.9 60 mm stroke achievement with different speeds. (a) Speed waveforms, (b) position waveforms, and (c) I_q current waveforms.

Fig.10 Current waveforms of one stroke with different speeds: (a) 0.1 and (b) 0.2 m/s.

Fig.11 Ten continuous strokes achieved with different speeds. Trapezoidal speed of (a) 0.1 and (b) 0.2 m/s.

Fig.12 Advance pulse trajectory achievement: (a) Four-time 20 mm and (b) seven-time 10 mm pulse waveform.

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