DC Motor Overload Cutout circuit

Uyyytt

What about a highside sensing solution across a e.g. 10A normal fuse?

don't want to swap fuses every time it triggers

No, only to double protection and use it as shunt.

How about implementing a negative feedback with that current sensor to regulate the current rather than shut it off?..then a standard fuse or trip could be used alongside, but hopefully never operates....perhaps a couple of op amps as comparators with a variable between to set a chosen hysterisis?....relays would be a bit of a rattle etc.

ah, didn't think of that; i will have to measure resistance across some fuses then

op amps are going to be subjected to some ungodly amount of spikes from the motor commutation

Peaks of voltage and current are always with us and our task is to get round them (no expertice from me here !!) eg star-delta, PWM, filters etc and possibly by performing a section of the total circuitry only after known likely peaks are past. Being aware of them is the first call with much experimentation here on EC with its oscilloscope.....I enjoy playing around like that because I don't have the electronic expertice to do it any other way....it makes it real fun though rather than all classroom theory....A good theory/practical balance and a desire to learn is all I aim for. Perhaps Hurz or another reader will pick up on the spike aspect here

I have good expirience with 32kHz PWM for this class of motor.

There you are faceblast....I have never given up on Hurz even though he has slammed me more than anyone on EC. Perhaps he is ready to turn against an intimidating power that threatens him within. If he does, then there will be plenty here to back him....He knows what I mean. We don' t have to continue in a wrong earlier choice.

Your comments in this form are not welcome and bullshit

To be honest

And you think I should be happy with you calling me a fraud earlier today?

Troll. Talk about electronic. And try to be as close as possible at your level of knowledge. If you go above to much, i will mark you as fraud to protect new EC users. And while you continue to not talk about electronic, i call you a troll. I think i made this clear from the very first day.

32kHz sounds good, I was looking at 10kHz for the higher fet gate drive impedance but it'll probably be noisy. 5nF at 32kHz = 1kΩ

Check my lastest bridge implemetation, its working with 32kHz. Sure you need only a single NMOS and not a full bridge.

full bridge would be nice but that's a lot of silicon

Face, are you sleeping? “Sure you need only a single NMOS and not a full bridge.“

Here a regulating PWM circuit i made, which you have to reconfigure in current for your needs http://everycircuit.com/circuit/5236931062398976