Driving small BLAC motors
- kostas
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So, I wonder if there is a simpler way, probably doing some of the work in software ..
I saw that there is a bldc_sine component for HAL. Could this be used for driving AC motors? If yes, any ideas of where should I start looking for the power electronics needed?
I also already have a Mesa 400K 7i43. Could this one somehow be used in this scenario? Probably outputting the PWM signals that would drive the power stage or something?
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- andypugh
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Not any more, it has been superceded by a general-purpose module called "bldc"I saw that there is a bldc_sine component for HAL.
Yes, this is what it is for.Could this be used for driving AC motors?
The simplest solution is the mesa 7i39, which costs $150 to drive 2 motors.where should I start looking for the power electronics needed?
I also already have a Mesa 400K 7i43
In theory you could use the output of a 3pwmgen function on your 7i43 to drive a 3-phase H-bridge chip directly. There are a number of suitable devices, see for example: docs-europe.electrocomponents.com/webdoc...0900766b80dca34c.pdf
(Though I think that won't work at your required voltage, and is rather over-kill)
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- kostas
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Incidentally, DRVxxxx chips were the first 3phase drivers I run into, while searching TI's products for some samples. I'll check them out.
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- andypugh
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Unfortunately Mesa's site does not mention 7i43 in the compatible cards list.
This is a 7i43 driving a 7i39 driving a BLDC motor:
So it definitely works. (it's my video)
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- kostas
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- kostas
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Do I also need pre-drivers, like the DRV8301? What are these used for?
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- PCW
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I miss typed on the DRV8333 I meant the DRV8332
These are all complete with gate drivers, no other chips needed (well perhaps a voltage regulator for gate power)
The DRV8301 is a similar device for driving external MOSFETS for higher currents
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- kostas
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Off topic: I sent you an email regarding Mesa electronics earlier this morning, did you get it?
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- PCW
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I haven't started dealing with email yet this morning -)
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