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That LoRa chip in the second-to-last image is there for Amazon Sidewalk I guess. Thankfully not enough bandwidth to broadcast your camera feed or audio. Is It true that Sidewalk is enabled by default?
Are you sure? yes | no
i am surprised by the quality of the hardware and the general engineering effort that went into this product, however the data extracted by those home spies is apparently valuable enough to justify the expense.
Very nice teardown, thanks for the thorough work!
Hello! Thanks for this really interesting teardown! Since is unreadable from the picture, could you please indicate which amplifier chip is that?
Huh?? What are all these coils for??
Is that some kind of subwoofer or something?Edit: Ahhh I see it follows you around. I wasn't familiar with this model. Still seems like a very expensive way of doing that though. I'd probably go for a simple stepper motor and a positional sensor? This'll be quieter and more responsive but it'll cost a lot of copper and coil drivers I bet.
I imagine being totally silent while moving was a very high priority as video conferencing seems like a good use case. Drive that BLDC with a sine drive with pwm above range of human hearing and you are good to go.
Have you ever seen how silent a regular stepper can be with a Trinamic driver?Choosing the right parameters, using a lower current to drive the motor, and it would absolutely be whisper quiet.So yeah, that amount of coils is... Why?At least seeing the amount of basically wasted electronics just to deliver a slightly more fancy user experience makes me much more comfortable with putting a little extra effort into some of my things ^^'
Also, I think they evaluated a lot of alternative in the R&D process, probably this solution is the best option to have smooth and silent movements
There is probably only 3 separate sets of coil drivers. This would be consistent with the way a brushless DC motor is built.
This is more or less a stepper motor, a BLDC motor build specific for this use case, if you produce enough it could be even cheaper, since you don’t pay an other manufactures profit and have no not needed case and bearing from a standard motor.. in general this Design is beautifully, a real direkt drive, no gears no belts -> no sound no wearing -> perfect Engineering choice if its the cheapest solution i don’t know. (open up a stepper or BLDC motor and you will also find many coils...)
Not "more or less", but just a custom BLDC, with 27 slots and 30 poles. It is driven by 3 pairs of MOSFETs, using the DRV8323 gate driver, controlled with an STM32F4. See the UFO-shaped PCB.
The comparatively high slot/pole count (for a BLDC) makes it a good choice for slow and smooth movement.
Compared with a conventional 2-phase bipolar stepper motor, a BLDC has a much higher power density at a significant lower weight. The huge size allows to use a central bearing carrying the weight of the rotating part.
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