Even if it's not, adding the diode directly across its terminals is cheap insurance. Given your belt and suspenders and duct tape and staples approach elsewhere, saving a few cents on a diode doesn't make sense.
I'm not trying to spare a diode that I have hundreds of, and I'm not crafting this out of a cardboard box and toothpaste either. hehehe
I meant the control circuitry of the motor (a BLDC), which uses a pressure switch as an additional feature along with what I thought was built in to control the coils as in hall effect sensors or rotary encoders, etc.
Current Sensing - Best Approach Advice Needed
4 years 1 month ago #17372
Now.. BLDC... This is a diferent beast. I think you cant use the aproaches we are discusing here with a BLDC.. .You will have some sort of square wave instead of an ON/OFF signal. I think you should poke around the control circuitry to find a clear ON/OFF signal. Or return to measure current before the black box.
One of the confusing issues with this particular motor is where the control circuitry is. I have to assume it is inside the motor itself since there are clearly two wires going into the back of the motor housing, but the wiring is snaked all around the entire unit. I'll look more closely in a minute.
The hacking point will be where the pressure switch is, and that I believe is encased where the 5/16" ID tube ports are connected. I really do not want to fiddle with that.
So I am open to any suggestions you guys have for monitoring the current drawn that is not invasive.