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

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

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (Grant No. 51605363), China Postdoctoral Science Foundation (Grant No. 2016M590922), and Shaanxi Postdoctoral Research Project Funding.

Electronic Supplementary Material

The supplementary material can be found in the online version of this article at https://doi.org/10.1007/s11465-020-0597-z and is accessible to authorized users.

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