I'm not sure if this is solvable without some major changes of the functional parts.

What does your current circuit look like? What is current limit set to and what is it limiting at?

 

If you have an electric motor in the hazardous area it must either be internally air purged OR of explosion proof construction. We did that with the gasoline fuel flow system on carburetor test stands, and the motors were totally accepted. The wiring had to be explosion proof as well. ( For those who do not know what "Explosion Proof" means in this context, look it up in the published standards. It is quite boring.)

 

If you have an electric motor in the hazardous area it must either be internally air purged OR of explosion proof construction. We did that with the gasoline fuel flow system on carburetor test stands, and the motors were totally accepted. The wiring had to be explosion proof as well. ( For those who do not know what "Explosion Proof" means in this context, look it up in the published standards. It is quite boring.)

The alternative is intrinsic safety (for small motors). The windings could be encapsulted as well (if possible) or oil filled. There are a lot of options, but all types of protection have their difficulties to apply for certain applications.

What does your current circuit look like? What is current limit set to and what is it limiting at?

The current is about 1.2 A when the MOSFET drives the motor. Basically it is just the motor and a MOSFET that drives it directly from the battery. I measured the voltage and the resistance to calculated it. The limit is at 600 mA for the inductance.

 

It seems like the application may be a "sniffer" for a portable gas detector. Our local gas company equips their service folks with those devices to use when a gas leak is suspected. They must somehow be safe because when I had called about a leak possibility the service person turned his sensor on and then almost immediately vacated the building and had me open all the doors to vent it, while he stood with his truck between him and the building. So it did not set off what could have been an explosive mixture.
So for a portable gas sensor there may be safe sized motors available.
That is just a guess on my part. The TS application may be different, we have no clues given.

 

The limit is at 600 mA for the inductance.

Show the schematic with the component values.

Whether the load is inductive or not doesn't matter for current limiting.

 

Show the schematic with the component values.

Whether the load is inductive or not doesn't matter for current limiting.

I'm talking about an energy limit. E=1/2*L*i²

 

I'm talking about an energy limit. E=1/2*L*i²

Still doesn't matter. The magnetic field has to collapse and you have to let it.

If you're concerned with back EMF, a current limiter isn't the way to address it.

 

"off topic" - i just remembered that some of such gizmos might meet your design requirements (not that i know too much more about it)

https://www.google.com/search?q=sepic+inverter+precision+current+limit
https://www.google.com/search?q=sepic+converter+precision+current+limit

https://www.analog.com/en/analog-dialogue/articles/buck-boost-voltage-converters-with-sepic.html says something about "includes ... externally adjustable current limit"