BLDC rotator plan

A project log for P2 - Pick and Place for 3D Printers

Pick and place head providing part rotation and top/bottom machine vision in a package lighter than an E3D V6.

Daren SchwenkeDaren Schwenke 04/24/2019 at 15:160 Comments

I'm going to use an STM32 as my microprocessor, and have that driving an L6234 as my 3 phase motor driver.

I'm going to build it on velo-board first, but I'll be using the same SMT components I would for the finished product.

I can do current control, but I actually don't have access to all three phases of current with that chip.  Two of the three phases have combined current sensing.  :(  That probably eliminates implementing Field Oriented Control later as I was hoping.  

There is another chip I was looking at though, the MP6536, which does break out current sensing for all three phases...  If Field Oriented Control becomes a sticking point for me, I can switch to using that one.  The overall schematic wouldn't change much, but of course the pinouts are radically different.

I'm using a driver chip instead of just building this with mosfets because:

I do have to be careful to only provide logic signals after that chip is powered up though or 'bad things happen'.

I'm still missing a few caps before I can get started.