Yeah it uses a tiny ceramic heating element to heat the bite area up to uncomfortable temperature. It's supposed to denature the toxin and/or counter inflammation. Either way it does reduce moskito itchiness with me.
Rare earth magnet motors require software too if you want them to be maximally efficient. You could embody that software in e.g. an FPGA of course, but it's still software.
"Brushless DC motors" are good because brushed DC motors are constantly switching polarity, which causes arcing of the brushes, which causes wear. The brushes are not there to energize the rotor; the rotor is just magnets after all. The brushes are there to tell the stator to change polarity.
Brushless DC motors don't arc -- because they switch stator polarity with electronics that sense the position of the rotor without rubbing parts. (They can also fine-tune the stator current spikes to make the motor very efficient over a wide speed range, which brushed DC motors cannot do.) The lack of arcing is more important than the fact that they don't have rotating contact points.
Brushed AC motors have rotating contact points (slip rings) but they don't arc (ideally), so the contact points don't degrade as fast as brushed DC motors do. But they do carry a lot of current because their purpose is to energize the rotor. Brushed AC motors are not ideal, but making an AC motor "brushless" is not nearly as big a win as making a DC motor brushless.
Wait. You're saying DC motors require current that's constantly switching polarity? So they're sort of really AC internally?
Yep. All motors require constantly changing current. The distinction between AC and DC motors is whether you feed the motor externally with current that is already alternating sinusoidally, or whether the motor itself turns external DC into some kind of AC.
We had that process too, and I insisted on it. Any PR not matched to one or more issues gets automatically rejected. The friction this injects ensures people are not wasting company resources bikeshedding.
I'm a world champion bikeshedder, and I both hated this policy and insisted we keep it.
I've had similar bad experiences with hotel resellers. You book a hotel with Expedia and roll into a foreign town at 11 pm after changing a flat tire on the way and the hotel says "we never heard of you and we are full."
I've never been stranded when I've contacted the hotel directly, via their website or the phone. Sometimes a glitch does happen, but when it does the hotel will call around on your behalf and find you a room.
I like this. Most people are doing the best they can while running on autopilot most of the time.
I think free will is possible but it requires a level of training and introspection and practice that most people find unpleasant, so most people revert to autopilot.
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