Abstract
A novel macro–micro linear actuator based on the giant magnetostrictive material has been proposed to achieve high precision and large-stroke. This structure uses a permanent magnet drive coil structure, and a new cylindrical structure permanent magnet linear actuator is made according to the principle of Lorentz force. The permanent magnet and the shell form stator part, and the giant magnetostrictive actuator (GMA) structure is embedded in the interior as a mover structure to achieve macro-motion displacement; the micro-motion can be realized by controlling the GMA. The micro-motion component and the macro-motion component can always remain coaxial in structure and integrated on a motor structure. The actuator’s output displacement can be adjusted by controlling the macro/micro coil current. Experimental results indicate that the macro-displacement can be up to 30 mm, and the response time is below 0.2 s. The micro-motion positioning accuracy can reach nanometer level, which has the advantages of simple structure and easy installation with coaxial, and has a broad application prospect in the field of precision manufacturing.
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Abbreviations
- GMM:
-
Giant magnetostrictive material
- GMA:
-
Giant magnetostrictive actuator
- \(B\) :
-
Magnetic induction
- \(l\) :
-
Effective length of each turn
- \(i\) :
-
Current in the macro coil
- \(N_{1}\) :
-
Number of the macro coil's turns
- \(N_{2}\) :
-
Number of the micro coil's turns
- \(F_{m}\) :
-
Macro force by the magnetic field
- \(\lambda\) :
-
The linear magnetostrictive coefficient
- \(l_{0}\) :
-
Length of the ferromagnet
- \(\Delta l\) :
-
Elongation in the direction of ferromagnetic length \(l_{0}\)
- \(H_{s}\) :
-
Magnetic field
- \(I\) :
-
Current in the micro coil
- \(z\) :
-
Distance from the axis midpoint on the axis
- L d :
-
Length of micro-coil
- R 1 d :
-
Inside radius of micro-coil
- R 2 d :
-
Outside radius of micro-coil
- \(H_{s}\) :
-
Magnetic field intensity on the axis
- \(P\) :
-
Thermal power of the coil
- \(P_{mac} ,P_{mic}\) :
-
The thermal power of the macro coil and micro coil
- \(R\) :
-
Coil resistance
- \(\rho\) :
-
Wire resistivity
- \(S\) :
-
Area of copper coil's cross-sectional
- \(L\) :
-
Total length of coil
- \(c\) :
-
The specific heat capacity
- \(T_{1}\) :
-
Initial water temperature in the water tank
- \(T_{0}\) :
-
Target temperature
- \(Q_{1}\) :
-
Calorific values calculated in terms of the specific heat capacity
- \(Q_{2}\) :
-
Calorific values calculated by the convection heat transfer method
- \(Q_{\max }\) :
-
The maximum value out of \(Q_{1} ,Q_{2}\)
- \(\eta\) :
-
Heat conversion efficiency
- \(P_{n}\) :
-
Endothermic power
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Acknowledgements
This work was supported by the Natural Science Foundation of China (No. 51675003, No. 51904009, and No. 11805005) and China Postdoctoral Science Foundation (2019M652159).
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Xie, T., Wang, C., Yu, C. et al. Design of Large-Stroke and High-Resolution Drive System Based on Giant Magnetostrictive Material. Int. J. Precis. Eng. Manuf. 22, 799–811 (2021). https://doi.org/10.1007/s12541-021-00475-4
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DOI: https://doi.org/10.1007/s12541-021-00475-4