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Old 04-05-2019, 03:05 PM   #3413 (permalink)
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Originally Posted by Quattro64 View Post
Hello, I just stumbled onto this thread as I am doing some pre-planning for an experimental airplane build. I found Paul's instructable for this also. Just wondering if a custom inverter/controller could be built following this thread that would work for the EMRAX 348. The low voltage version of this motor with a battery pack in the 200-300v range should be able to directly drive a propeller at the required 2500 rpm range. The Emsiso EmDrive 500 that is recommended is only capable of around 110v.

Not sure how much $$ the Emsiso drive goes for, I might be able to run two in series? Seems building my own could be a cost saver? Thanks for anyones' thoughts on this.
I have not heard of an Emsiso drive - I looked it up and it is rated 800A peak and 500A continous. That's not too powerful. I don't think 2 in parallel will work unless you can synchronize the transistors firing.

The Emrax low voltage looks like it will take 1100A for 30 sec. That's quite a beast of a controller to buy or to build!

Paul's control board is .. not for sale right now? It seems that Paul is moving?

Anyway, it was somewhere around $400 for a pre-built and tested board.
Less if you buy the bare board and build it yourself. Then you need $$$ for the IGBTs at whatever current you want to build (for a 300V pack, I'd use 600V or higher rated IGBTs). 600A IGBTs are a decent price on ebay (under $1000). New they are a bit higher.

If you want to go to 1000A it's about double the price.

The big ring capacitor was expensive too. I don't know where Paul gets them. But it was $200+. Low equiovalent series resistance. Very high peak currents are possible.

Current sensors are not too expensive (maybe $200 for 3).

The heat sink, fans, etc are heavy so you will likely have some trade-offs to decide on. What is 'enough' cooling. How fast do you need to be moving to get the heat away. How fast (and how many amps) do you want to max out at? Do you need a fan at all for low speed taxing?

The heat sink for the controller would have to be in the air stream.

... that it for the high priced parts. The rest is work, testing, making an enclosure, and tuning the controller parameters to your motor.

I built a controller for my car. I'm not sure I'd build a controller for a plane. Having to stop on the side of the road because I didn't do something right is one thing. Falling out of the sky is .. another!
In THEORY there is no difference between Theory and Practice

Last edited by thingstodo; 04-05-2019 at 03:28 PM.. Reason: fix typo
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