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. 2024 Aug 1;15(8):1002.
doi: 10.3390/mi15081002.

Development of Precision Controllable Magnetic Field-Assisted Platform for Micro Electrical Machining

Cheng Guo  1   2 , Weizhen Zhuang  1   2 , Jingwen He  1   2
Affiliations

Development of Precision Controllable Magnetic Field-Assisted Platform for Micro Electrical Machining

Cheng Guo et al. Micromachines (Basel). .

Abstract

In order to introduce the magnetic field into micro electrical machining technology to explore the influence of magnetic field on micro electrical machining, the development of a precision controllable magnetic field-assisted platform is particularly important. This platform needs to precisely control the spatial magnetic field. This study first completes the hardware design and construction of the magnetic field generation device, using electromagnetic coils with soft iron cores as the sources of the magnetic field. Mathematical models of the magnetic field are established and calibrated. Since the magnetic dipole model cannot effectively describe the magnetic field generated by the electromagnetic coil, this study adopts a more precise description method: the spherical harmonic function expansion model and the magnetic multipole superposition model. The calibration of the magnetic field model is based on actual excitation magnetic field data, so a magnetic field sampling device is designed to obtain the excitation magnetic field of the workspace. The model is calibrated based on a combination of the theoretical model and magnetic field data, and the performance of the constructed setup is analyzed. Finally, a magnetic field-assisted platform has been developed which can generate magnetic fields in any direction within the workspace with intensities ranging from 0 to 0.2 T. Its magnetic field model arrives at an error percentage of 2.986%, a variance of 0.9977, and a root mean square error (RMSE) of 0.71 mT, achieving precise control of the magnetic field in the workspace.

Keywords: electromagnetic coil; magnetic field; magnetic multipole superposition; micro electrical machining; spherical harmonic function.

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Conflict of interest statement

The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
Design of a single electromagnetic coil: (a) model of a single electromagnetic coil; (b) industrial pure iron soft iron core; (c) keel.
Figure 2
Figure 2
Simulation of a single electromagnetic coil: (a) model of a single electromagnetic coil; (b) magnetic field distribution in the workspace without a core; (c) magnetic field distribution in the workspace with a core.
Figure 3
Figure 3
Overall configuration of magnetic field-assisted machining device: (a) overall structural framework; (b) distribution of electromagnetic coils.
Figure 4
Figure 4
The drive system.
Figure 5
Figure 5
Magnetic field sampling device: (a) magnetic field sampling circuit board; (b) MLX90393 magnetic sensors; (c) ALS31300 magnetic sensors.
Figure 6
Figure 6
Schematic diagram of the magnetic field sampling scheme.
Figure 7
Figure 7
A cylindrically symmetric system in spherical coordinates [19].
Figure 8
Figure 8
Magnetic field data obtained by simulation: (a) simulation model; (b) simulation results of single excitation current.
Figure 9
Figure 9
Distribution of model error values after calibration.
Figure 10
Figure 10
Magnetic field manipulation of a small magnet.
See this image and copyright information in PMC

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