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designing a tiny 3 kW BLDC motor driver 

365 Robots
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Let’s approach the design of a brushless DC motor driver in an ultra-compact form factor. Its base is only 40x40mm and is currently designed to handle 3kW of power.
This second episode features a basic design overview, major component selection, and a first attempt at packaging it.

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15 сен 2024

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Комментарии : 16   
@envisionelectronics
@envisionelectronics 6 месяцев назад
Good luck. I designed a 2kW BLDC driver in the same space and it survived 4.8kW peaks (100A per phase). Your biggest problem will be cross conduction, then thermals and EMI which I can see in your schematic you have basically ignored. 6 layers, parallel copper.
@jorsanflo
@jorsanflo 7 месяцев назад
Someday you will be famous
@BogdanTheGeek
@BogdanTheGeek 6 месяцев назад
Odd choice to go for a TO packaged mosfer for an obviously thermally constrained layout. If anything, you would at least want to place them upside down to have contact with the lower thermal resistance side of the package. I also designed a 1.5kva bldc driver in a similar space, with a stacked esp32 no less. I used some irf7749l1, pricey, but one of the lowest thermal impedance package out there.
@BogdanTheGeek
@BogdanTheGeek 6 месяцев назад
Furthermore, you also don't seem to have any gate drivers for your mosfets. That is a dangerous situation to be in, switching will create a lot of ringing, overdriving your mosfets. Easy way to kill them. Also, if you plan on using the mcpwm module, save yourself the time, use the the ledc one instead, especially if you plan on doing quasi sin control. Also, the esp32 adc is not fast enough to do back emf sensing, so you need an external comparator. Fov is also pretty much out of scope for anything above 2krpm.
@365robots
@365robots 6 месяцев назад
Yeah, taking a second look at the mosfet package Is probably a very good idea. Thank's for sharing your experience!
@TotallyNotJason101
@TotallyNotJason101 6 месяцев назад
i wonder if i can use this with vesc firmware and use in my scoot.. very great work!
@kylejewiss659
@kylejewiss659 7 месяцев назад
3 kW in that space is crazy, well done. Thermals will be the limiting factor, wont it?
@ljuberzy
@ljuberzy 7 месяцев назад
I'd say, the fields and EMI will be sooner than thermals?...
@365robots
@365robots 7 месяцев назад
Yep, that‘s my biggest concern as well. Let’s hope I can pus it as far as I like. Regarding Thermals, worst case the prototype could be watercooled…
@ljuberzy
@ljuberzy 6 месяцев назад
they used to put it into oil ;-)@@365robots
@boris5448
@boris5448 7 месяцев назад
In which software did you make the pcb/schematic? The 3d models look really clean!
@365robots
@365robots 7 месяцев назад
It‘s Fusion 360. But this is probably the largest project I would want to do with the free version…
@RinksRides
@RinksRides 6 месяцев назад
Aka: how to start an expensive electrical fire.
@sapuseven
@sapuseven 6 месяцев назад
Why do you say that?
@dekutree64
@dekutree64 Месяц назад
@@sapuseven BLDC drivers are always moments away from an electrical fire, and high power ones are expensive.
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