VESC controller: Check Axiom datasheet!

Electric Motors and Controllers
Hackey   1 mW

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Re: VESC-controller: Axiom hardware released!

Post by Hackey » May 14 2019 12:25pm

Hey marcos

Please have a look at these driver board and update if i can use this.

http://www.ti.com/lit/ug/sllu207a/sllu207a.pdf

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marcos   100 W

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Re: VESC-controller: Axiom hardware released!

Post by marcos » May 14 2019 2:34pm

Hackey wrote:
May 14 2019 12:25pm
Hey marcos

Please have a look at these driver board and update if i can use this.

http://www.ti.com/lit/ug/sllu207a/sllu207a.pdf
Its a good chip but the eval board lacks the isolated DC/DC to send power across the isolation.
Does your project need a high performance motor drive? Let's talk!
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Do you like our work? Support Axiom to win the 2019 Hackaday Prize!

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marcos   100 W

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Re: VESC-controller: Axiom hardware released!

Post by marcos » May 15 2019 9:11pm

We are ready to release the Axiom datasheet!

Next Monday all our subscribers will have access to the datasheet through our newsletter.
To subscribe to the newsletter, sign up here!

http://www.powerdesigns.ca/newsletter/

It will be only available to the subscribers for quite a while until we let the file publicly available for download.
Important announcements will happen there as well, so we hope to see you guys in the list.

FYI I subscribed some people that explicitly asked to be kept updated, and people that are using our boards.

And btw, Axiom is the clear leader in hackaday prize popularity so far, woot!

Cheers!
Does your project need a high performance motor drive? Let's talk!
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Hackey   1 mW

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Re: VESC controller: Check Axiom datasheet!

Post by Hackey » May 16 2019 5:22am

I am close.
Mosfet for 24v side came faulty so ordered the replacement now.

Can i use any other mosfet for temperory replacement. What should be minimum voltage rating for that mosfet. ImageImage

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marcos   100 W

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Re: VESC controller: Check Axiom datasheet!

Post by marcos » May 16 2019 4:23pm

Hackey wrote:
May 16 2019 5:22am
I am close.
Mosfet for 24v side came faulty so ordered the replacement now.
Can i use any other mosfet for temperory replacement. What should be minimum voltage rating for that mosfet.
I have to say I'm terrified about the outcome of this, the board looks assembled with a soldering pen a instead of reflow soldered, the only way I could replace that mosfet is reflowing the whole board (probably twice). A solder blob or cold joint in the control IC could have made the mosfet to blow. Also check the polarities of all the diodes and tvs.
No, you shouldn't use any other mosfet, I can't assure it will work. I spent an hour looking for a replacement when the original part used in the simulations were non stocked.
By default the board provides 24V, but you need to check if thats the voltage your gate driver needs. Axiom uses 15V for example.
Does your project need a high performance motor drive? Let's talk!
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Hackey   1 mW

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Re: VESC controller: Check Axiom datasheet!

Post by Hackey » May 16 2019 11:53pm

marcos wrote:
Hackey wrote:
May 16 2019 5:22am
I am close.
Mosfet for 24v side came faulty so ordered the replacement now.
Can i use any other mosfet for temperory replacement. What should be minimum voltage rating for that mosfet.
I have to say I'm terrified about the outcome of this, the board looks assembled with a soldering pen a instead of reflow soldered, the only way I could replace that mosfet is reflowing the whole board (probably twice). A solder blob or cold joint in the control IC could have made the mosfet to blow. Also check the polarities of all the diodes and tvs.
No, you shouldn't use any other mosfet, I can't assure it will work. I spent an hour looking for a replacement when the original part used in the simulations were non stocked.
By default the board provides 24V, but you need to check if thats the voltage your gate driver needs. Axiom uses 15V for example.
I am using same gate drivers you used. How can i supply 16v to board can i use seperate buck boost converter for this.

Mosfet came shorted from digikey i checked it beforehand. I also checked all components and main ic soldering seems preety good and no solder blobs there.



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marcos   100 W

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Re: VESC controller: Check Axiom datasheet!

Post by marcos » May 17 2019 9:49am

Hackey wrote:
May 16 2019 11:53pm
I am using same gate drivers you used. How can i supply 16v to board can i use seperate buck boost converter for this.
Set R74 to 110kohm for 15V operation.

Beware your ESD countermeasures, its unlikely that digikey will send you a damaged part.
Does your project need a high performance motor drive? Let's talk!
www.powerdesigns.ca
Do you like our work? Support Axiom to win the 2019 Hackaday Prize!

Hackey   1 mW

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Re: VESC controller: Check Axiom datasheet!

Post by Hackey » May 19 2019 8:10am

How to calculate current gain of current sensors.
HASS-400-S

And after making all connections fault light is staying on. What could be issue.


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marcos   100 W

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Re: VESC controller: Check Axiom datasheet!

Post by marcos » May 20 2019 8:17am

Hackey wrote:
May 19 2019 8:10am
How to calculate current gain of current sensors.
HASS-400-S

And after making all connections fault light is staying on. What could be issue.
We have a lot of math developed around this controller to calculate gains, tolerances, trips, cutoffs, and errors, but that is not open source, its there to help our customers and speed up our consultancy work.
You could find this line helpful though.

With that older board you need to add this to hw_axiom.h:
#define HW_PALTA_REV_B
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Hackey   1 mW

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Re: VESC controller: Check Axiom datasheet!

Post by Hackey » May 20 2019 1:07pm

marcos wrote:
Hackey wrote:
May 19 2019 8:10am
How to calculate current gain of current sensors.
HASS-400-S

And after making all connections fault light is staying on. What could be issue.
We have a lot of math developed around this controller to calculate gains, tolerances, trips, cutoffs, and errors, but that is not open source, its there to help our customers and speed up our consultancy work.
You could find this line helpful though.

With that older board you need to add this to hw_axiom.h:
#define HW_PALTA_REV_B
Thanks for the feedback.

Now my vbus is not measuring any voltage its showing 0.00v.

I am having R22,6,8 as 1Mohm and i have connected battery pack of 20s (75v nominal) i have measured voltage of around 25mV at input of AMC1301 and output of around 1.35 at output . Then i checked opamps and i got around 205mV.
And i also checked the voltage at PC3 pin of stm32 which is same as 205mV.

I have also changed HVDC Transfer function from 185 to 363.63 to compensate for the 3Mohm resistors.

Please suggest some solution.Image

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Last edited by Hackey on May 20 2019 1:07pm, edited 1 time in total.

Hackey   1 mW

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Re: VESC controller: Check Axiom datasheet!

Post by Hackey » May 21 2019 12:25am

I also set the battery configuration in controller do i need to set any thing else in control software.

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