H-bridge motor driver circuit

[Tantalum]

Hello

I have a little project. I need to driver a small linear actuator, like on this picture:


The specs:
- ESP32 Wifi module
- H-bridge motor driver (don't know exactly which one yet, but it doesn't matter)
- 24VDC power over a 20m long cable
- in a waterproof box outdoors


Now the questions:

Q1: Do I need an isolated DC-DC converter?

Q2: Is it advisable to use a surge stopper like a LTC4366 (burns the peak surge voltages in a MOSFET), or are passive protections (Diodes/Movs) enough?

Q3: Is it better to use an opto-coupler on the motor driver input-side?

Thank you for your help 

[Siwastaja]

Q1: No, Q2: No for LTC4366, no for MOVs; what are "diode protectors"?, Q3: No;

but this rises a question of why you think asking those questions make any sense, and what are the things you are missing?

Therefore,

- H-bridge motor driver (don't know exactly which one yet, but it doesn't matter)

I think this does matter. The design of the motor driver itself is the key.

[Tantalum]

Well I was thinking to use a DRV8871 (45V/3.6A max) which seems more than enough for a 12V 0.6A motor like the one I'm using.

[Siwastaja]

Well I was thinking to use a DRV8871 (45V/3.6A max) which seems more than enough for a 12V 0.6A motor like the one I'm using.

Then the important points are PCB layout and DC link capacitance. A TVS on power input might be a good piece of protection.

What drives the inputs of DRV8871?