You are here

AC Synchronous motor support

6 posts / 0 new
Last post
Dark
Offline
Last seen: 3 years 5 months ago
Joined: 2019-07-29 14:42
Posts: 2
AC Synchronous motor support

Hello,

I'm new to this forum and I hope that you will bear with me :) .

Is VESC able to drive AC Synchronous motors in closed loop with torque control, and i mean full featured control like Foc or Bldc mode. Here are some example motors:

I think that this one has 8 poles ( if it matters )

https://www.alibaba.com/product-detail/Small-Mige-130-series-1KW-best_60...

Or these Kollmorgens

https://www.kollmorgen.com/en-us/products/motors/servo/akm-series/akm-se...

 

To be honest, I'm not really sure that they are synchronous ac. if someone knows better don't hold back.

I know that people have used Argon / Ioni from Granite Devices to drive these motors. In the settings menu it is set to 3 phase AC or BLDC.

 

And now I'm sitting here, scratching my head. I found multiple sources on the net saying that bldc needs dc square wave, and ac needs sine wave to operate Efficiently. So can we feed BLDC with AC sine and AC sync with DC square wave? Is that what Argon / Ioni is doing?

 

Thank you to everyone who read this post :)

 

skyline1970
Offline
Last seen: 1 month 4 days ago
VESC Free
Joined: 2017-09-07 22:28
Posts: 232

Read below discussion.

https://vesc-project.com/node/872

 

Dark
Offline
Last seen: 3 years 5 months ago
Joined: 2019-07-29 14:42
Posts: 2

I already saw that discussion. But I am not interested in induction motors. My topic us about permanent rotor magnet motors driven by ac sinusodial voltage. Aka BLAC, PMSM.

frankiedyke
Offline
Last seen: 3 years 4 months ago
Joined: 2019-09-14 09:02
Posts: 1

It is feasible, It just need some firmware changes.

VESC already does, in the terminal you can run an open loop 3 phase at a configurable frequency. An ACIM won't freak out with that signal, it will spin.

However, what you and me want is FOC. The FOC control loop for driving an ACIM is different because it introduces the concept of slip. Those are few new lines of of code.

The challenging part is developing a new observer algorithm to keep track of the flux angle. Its easier when you have magnets, the flux rotates with the mechanical angle, but in ACIM the flux is slipping away and you need to estimate its angle, and also depends on rotor inductance and resistance, which have quite some temperature dependency.

So yeah, its doable, I have a board ready to ship to Benjamin if its useful to him for ACIM development.

 

 

 

 


Run 3 online
Kedritrem
Kedritrem's picture
Offline
Last seen: 2 years 3 weeks ago
Joined: 2021-01-14 20:03
Posts: 1

Any chance you've come up with a solution to this?

Let me know if you have.

Thanks!

rizanirusli
Offline
Last seen: 5 months 6 days ago
VESC Free
Joined: 2021-04-23 10:33
Posts: 2

has anyone tried VESC FOC for BLDC with power > 2kW?
Is VESC support for PMSM using a resolver?