Simple Driver Circuit For SMAs (MEC142E)

This article was written based on my book Robotics, Mechatronics and Artificial Intelligence (sold out) published in the United States. The described circuit can be used to control SMA (Shaoe Memory Alloy) in robotics and mechatronics projects. The block circuit in Figure 1 illustrates the simplest way to drive an SMA. The voltage must be calculated according to the SMA (length, current, and resistance by meter) and the power supply must be able to supply the necessary current.

The SMA contracts when switch (S1) is closed and distends when the switch is open. The switch can be replaced with relays or sensors. Many of the previous blocks that use relays can be coupled to an SMA by adding a block like this one.


Figure 1    Simple SMA driver.
Figure 1 Simple SMA driver.