Comment on [discussion] DC (direct current) power network
BearOfaTime@lemm.ee 3 weeks agoThe best you could replace those with would be modern brushless DC motors, which require really expensive inverter controls that die frequently due to the magnetic transients
Wow, is this why my new brushless cordless tools have had more issues than my 25 year old cordless tools?
empireOfLove2@lemmy.dbzer0.com 3 weeks ago
I mean, yes and no. A lot of that is modern tools are going to be more carefully engineered to operate as close to failure as possible, as to advertise more power with a cheaper device. Thry have small wires and encoder sensors that can be prone to failure.
Yes, the driving electronics are also sensitive, but the brushless motors also do not have brushes that wear down rapidly in a very dirty/dusty contaminated environment like older power tools would. So it’s a bit of a 50/50.
BearOfaTime@lemm.ee 3 weeks ago
Hahaha, now I’m picturing an IC with an angry face just before it farts out Magic Smoke.
Yea, I’ve had a couple new impact drivers needing the controller replaced, I assume they’re a package.
empireOfLove2@lemmy.dbzer0.com 3 weeks ago
Well, that’s basically how they behave too lol. Solid state power components are generally not very tolerant and require careful surge suppression and filtering to not have them blow up frequently.
I bet if you took that 25 year old driver apart, sanded off the commutator rotor, and put new brushes in it you’d suddenly find it’d have more power and use less battery. (And thats something you can do with older tools!)
When brushed motors get old and oxidation/dirt builds up the resistance across the brushes to the rotor coils grows and you’ll lose motor efficiency.