Do others agree that it would be a good idea to use opto-isolation to connect a controller to a PWM controller and motors?

This strikes me as a good idea because it greatly reduces the prospect of motor noise impacting the controller and the controller's power supply.

In such a design the motors and their electronics would have a dedicated battery and would be controlled using an opto-isolator circuit "driven" by the MCU.

Thoughts?

 

I have found in practice, using relatively low current (<20A) DC motors, that having separate power supplies connected to a common point using a star connection is sufficient. If either of the supplies is connected to a live mains supply then isolation would be necessary for safety reasons.

 

+1 on the mains powered systems, I generally use the MOC8106 etc input into the Mosfet drivers.
Max.

 

Either be smart about grounds or use isolation.

 

RE: LHM
Why the 8106?
With what that is better as mountains of all kind of imaginable other optos??
Woul like to hear some experience stories