How to Calculate Bias Spring and Heating Current for SMA Spring Actuator?

AI Thread Summary
Calculating the bias spring and heating current for a Shape Memory Alloy (SMA) spring actuator requires specific details such as the spring's diameter, material properties, and dimensions. Key factors include the resistivity of the SMA, its thermal capacity, and the insulation or heat loss conditions. The duration of the current pulse needed to reset the SMA shape is also crucial for accurate calculations. A recommended resource for further guidance is a 2008 paper titled "On the Design of a Shape Memory Alloy Spring Actuator Using Thermal Analysis." Understanding these parameters is essential for effective actuator design.
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Hi all ! I have to design a shape memory alloy spring as actuator.
Do you have any information's about how to calculate the bias spring or the Force needed ? the current necessary to heat the SMA spring for a 4mm stroke ?
Thank you
 

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Is this homework?

You have no scale or specifications with your diagram, so the diameter and force of the spring material is not available.

To calculate the current needed to recover the SMA shape you must know it's resistivity and dimensions, thermal capacity and the insulation or heat loss situation. How long will the current pulse that resets the SMA last?
 
Which is ...
"On the Design of a Shape Memory Alloy Spring Actuator Using Thermal Analysis", 2008.
 

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