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Topic: Position Control with a 2 Terminal Motor (Read 197 times) previous topic - next topic

cbocatto

Hi Everyone!


I am simply trying to drive a Linear Actuator with a PID control algorithm ,  however I currently do not have positional feedback.

THANKS everyone for the great resources on PID! :)

I am hoping to use this Firgelli Automation High Speed Linear Actuator seen here:


Motor Data here:
https://www.firgelliauto.com/products/high-speed-actuator

My question to the forum is if there is a simple "add on" sensor that I might be able to attach the external mounting holes, or motor body that might be able to give me the position information that I am looking for? 

I have also looked into feed forward systems, however I do not believe that i should go down that path just yet.

Thank you all in advance,
Carlo Bocatto

avr_fred

The stroke distance and required resolution?

Also, do not dismiss the possibility it will be cheaper to purchase a new actuator with built-in position feedback.

MarkT

Hi Everyone!


I am simply trying to drive a Linear Actuator with a PID control algorithm ,  however I currently do not have positional feedback.

THANKS everyone for the great resources on PID! :)

I am hoping to use this Firgelli Automation High Speed Linear Actuator seen here:


Motor Data here:
https://www.firgelliauto.com/products/high-speed-actuator

My question to the forum is if there is a simple "add on" sensor that I might be able to attach the external mounting holes, or motor body that might be able to give me the position information that I am looking for? 
A linear encoder (optical, hall effect, etc), an LDVT (bit old school), linear potentiometer...
Quote
I have also looked into feed forward systems, however I do not believe that i should go down that path just yet.
feedforward position control - no that's not going to work well.  That's like reversing into the garage using a
stop watch and not looking through the mirror...
Quote
Thank you all in advance,
Carlo Bocatto
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

cbocatto

Thank you for your replies MarkT and avr_fred!

I agree with you MarkT, it is indeed not ideal, however i believe i might have found a solution in the form of a string potentiometer.

3D Printed String potentiometer:
https://www.thingiverse.com/thing:1926226

The setup seen in the video seems to be well thought out and honestly should suffice for a "bolt" on solution for a fairly decent linear motion sensor.

Thanks you both for your replies!

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