Driving small BLAC motors

More
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?

Please Log in or Create an account to join the conversation.

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Not any more, it has been superceded by a general-purpose module called "bldc"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

Please Log in or Create an account to join the conversation.

More
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.

Please Log in or Create an account to join the conversation.

More
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.

Please Log in or Create an account to join the conversation.

More
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)

Please Log in or Create an account to join the conversation.

More
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.

Please Log in or Create an account to join the conversation.

More
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?

Please Log in or Create an account to join the conversation.

More
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

Please Log in or Create an account to join the conversation.

More
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?

Please Log in or Create an account to join the conversation.

More
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 -)

Please Log in or Create an account to join the conversation.

Moderators: PCWjmelson
Time to create page: 0.219 seconds
Powered by Kunena Forum