Here’s the one that felt like a stroke:
Nope! It has a range of speeds. The PWM signal it provides also produces something called “counter-electromotive force”. I don’t remember the exact specifics, but if this measurement falls (corresponding with a drop in blooded pressure) it will increase the pump speed (up to the maximum RPM permitted).
That is how our circulatory system works as well - a drop in blood pressure usually results in an increase to heart rate. I say usually, because I coincidentally have a nervous disorder where this is broken - an increase in heart rate will drop my blood pressure. A drop in blood pressure will also increase my heart rate, which then drops my blood pressure, which causes a runaway and I faint.
I actually know this! I used to work on an LVAD controller about 10 years ago. The technology is largely similar.
The pumps are centrifugal, they have to maintain blood pressure, and are largely waterproof.
The pumps spin with a brushless DC motor controlled by PWM. Depending on the specifics of the motor the RPM can be between 8,000 and 22,000. Because of the limitations of battery technology, you’re stuck with using a LiPo battery. LiPos are annoying as all shit to deal with. You have to charge them carefully, discharge them carefully, and they’re pretty big.
To give you an idea - FPV racing drone batteries can last several minutes: https://www.getfpv.com/batteries/mini-quad-batteries/cnhl-ultra-black-series-1050mah-150c-6s-lipo-battery-xt60.html On a really carefully tuned racer, you can get maybe 5 minutes out of a quad that would use that battery.
Edit: I was incorrect, the first battery I provided was not the battery that would be used in racing. LiPos are what I wanted to share. The battery now highlights what I wanted to.
Somehow, a huge amount of people hate thinking. Like it’s painful or like exertion or something. Anything that can just give them what they want is better.
It doesn’t matter if it’s right or wrong. They just want an answer. They don’t want to know why, or how, they want to know now.
It’s the shortcut to knowledge all the ancient parables warned us about. Instead of physically destroying your mind, it stops it from working at all.
At what point do we become Borg