Cheap linear actuators from Aliexpress

Not really a review because I haven't tried one, but an article in the June 2022 issue of "Practical Electronics" points out that these are getting much cheaper.

Could have uses in submarine applications requiring a bit of "linear grunt" e.g piston tanks, trim weights??

Possible choice below:




30mm/50mm/100mm/150mm DC 12V 30N/60N/90N/150N Linear Micro Actuator Motor Controller Mini Electric Push Rod Putter
4.8
71 Reviews
350 Orders
US $19.67
Speed ​​(rpm) : 30mm
30mm
50mm
100mm
150mm
Tension (V) : 150N
30N
60N
90N
150N

they work ok, I use them for home automation applications like opening windows. the main problem is they dont have feedback so you cant set it to a position only select more or less.

Thanks for the feedback.

Yes, I suppose the downside of having something all-enclosed and compact is that it may be difficult to get a magnet in to act as a trigger for a Hall switch proportional circuit e,g

https://www.theassociationofmodelsubmariners.com/t1774-arduino-proportional-control-of-a-piston-tank?highlight=piston

I assume they have limit switches built-in? (Later edit: The spec says "Yes"!)


David

these are the linear servos i was hoping to get three of to see if i could make them work together to move a piston for a ballast tank... at $100 a pop it would make for an expensive ballast tank, but not beyond the realm of possibility.

https://www.servocity.com/lightweight-linear-servos/