MGM controller

E

ES2016

1 µW
Joined
Jan 9, 2016
Messages
2
Hello,

I'm new here so please bear with me if I'm asking stupid questions :)

I've been trying to build a small PMSM/BLDC FOC controller for the past months and I recently stumbled upon some MGM Controllers that seemed very interesting but I'm gonna need your skills for fact/BS checking :

So we are talking of a 15kW continuous -rated BLDC controller that measures 99x60mm and weighs 390g... Seems on par with the claims that R/C equipment manufacturers make... But at the same time, these controllers are supposedly "Industrial-grade".

Also, in the link (ask me for the pdf if it doens't work), they are talking (page 6) of the MOSFET used and the only characteristic given is : 2x0,53mOhms !!
Has anyone heard of such low RDSon ? If so, do you have any references?

Here's the link :
http://downloads.mgm-compro.com/hbc-manual-b15-lv-mv-170915-b-eng.pdf

Hope some of you will have some answers :)


ES
 
Welcome to ES, ES.

That is a very comprehensive manual, looks like they must be expensive!

Paralleled FETs will lower the resistance per phase, which is what I assume they are using in the spec.
4 MOSFETs in parallel of 2mOhms each would give a 0.5mOhm phase. Or whatever they use.
 
These controllers look very interesting indeed. Info does seem a little thin on the ground, however there appears to be a number of people using them in light aircraft successfully. One notable exception is the post failure teardown on these forums of the 280120 model, it let the smoke out in a big way.

https://endless-sphere.com/forums/viewtopic.php?f=30&t=70392&p=1061983&hilit=280120

That's not really a deal breaker as there's no accompanying info on how the failure occurred, anything is going to fail if used beyond its designed capacity/environmental envelope.

One thing that's not apparent - are these FOC/sinewave controllers?

The RDS on appears to be reasonable given the large number of paralleled FET packages.

Don't suppose you have a link to the Datasheet/Manual for the larger units?
 
Hi Greg, Hi Ohbse,

Thanks for the info,

Indeed, 12 D2Pak/phase might get the RdsON to such low numbers...
Intresting teardown btw, do you know why it burst into flames?

About FOC/Sinewave :
Don't know about sinewave but it can not be FOC since I don't see any current sensors in any of their controllers.

ES
 
The amount of effort put into the manual suggests the claimed ratings ought to have been obtained by bench/dyno. It would be a good sign if the manufacturer or their agent would provide details of the testing. FWIW I'd expect any continuous ratings to be based on a 60 minute constant load test.
 
"Monitoring all phases and bus"

This could potentially point to phase level current sensing?

From first page of the manual.

I've enquired as to datasheet for the larger units, if somebody gets back to me I'll ask a few more questions. If these are sinewave capable it could be a good fit for me assuming the price isn't ridiculous...
 
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