Driving small BLAC motors

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07 Oct 2011 09:46 #13737 by kostas
I have some Yaskawa 24V/10W brushless AC motors and would like to try and drive them from EMC. I started searching for the electronics and a uC that could be used for driving these, but I got a little confused because my electronics knowledge is very limited.

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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07 Oct 2011 13:25 #13749 by andypugh
kostas wrote:

I saw that there is a bldc_sine component for HAL.

Not any more, it has been superceded by a general-purpose module called "bldc"

Could this be used for driving AC motors?

Yes, this is what it is for.

where should I start looking for the power electronics needed?
I also already have a Mesa 400K 7i43

The simplest solution is the mesa 7i39, which costs $150 to drive 2 motors.
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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07 Oct 2011 15:03 #13754 by PCW
Replied by PCW on topic Re:Driving small BLAC motors
There are a number of low voltage integrated drivers that would work for example the TI DRV8432 and DRV8333 are pretty nice. 7 or 8A max at 50V but an awkward for home assy SMT package.

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07 Oct 2011 18:21 #13767 by kostas
Replied by kostas on topic Re:Driving small BLAC motors
Unfortunately Mesa's site does not mention 7i43 in the compatible cards list. I would like to try it and see what I can get from the motors, before trying to build something from scratch. I can't afford buying one more FPGA card at this moment though.

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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07 Oct 2011 18:37 #13768 by andypugh
kostas wrote:

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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07 Oct 2011 18:58 #13769 by kostas
Replied by kostas on topic Re:Driving small BLAC motors
Excellent! I'll send an email to the Czech distributor to see when they will have one to order.

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11 Oct 2011 09:42 #13823 by kostas
Replied by kostas on topic Re:Driving small BLAC motors
Peter, I'm about to order some DRV8332 and DRV8312 samples from TI. I didn't find the 8432 and 8333 you mentioned.
Do I also need pre-drivers, like the DRV8301? What are these used for?

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11 Oct 2011 13:31 - 11 Oct 2011 13:34 #13829 by PCW
Replied by PCW on topic Re:Driving small BLAC motors
www.ti.com/product/drv8432

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
Last edit: 11 Oct 2011 13:34 by PCW. Reason: ommision

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11 Oct 2011 13:44 #13830 by kostas
Replied by kostas on topic Re:Driving small BLAC motors
Thanks. I was looking at three phase drivers, that's why I didn't find 8432. It says it's for brushed DC motors. Is there a difference?

Off topic: I sent you an email regarding Mesa electronics earlier this morning, did you get it?

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11 Oct 2011 14:37 #13834 by PCW
Replied by PCW on topic Re:Driving small BLAC motors
The 8432 has 4 half bridges so it can be use for 3 phase (using 3 half bridges) or step motors or dual brushed motors using all 4

I haven't started dealing with email yet this morning -)

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