Calling All Brainiacs!
 

I think we should develope a brushless motor dyno. Something that can handle a minimum of 2250w (3+ HP). Something to test torque, efficiency, RPM/v (loaded & unloaded, etc), current draw. etc.).

Maybe it's possible to utilize existing software or even base it off of a Eagletree.

Load can be provided by eddy current power absorber or a water brake absorber.

Any interest or thoughts????? I have ideas and some sources for hardware & software but not the time to pull it all together.

I have been trying to come up with something as well. Software is the biggest part of it, but not a roadblock by any means. I have an idea of how to do it, but I need to do alot of math to get it correct.

I know of one or two companies that customize their software and have an excellent product. Cost becomes the issue there.

The other issue is a variable power supply for the motor. What's needed? 50V @ 150A? It should be a supply vs battery but how big would it need to be assuming it's a quality supply with adequate "headroom"????

you would use a the battery you will be running with the motor, and the ESC. No need for a powersupply like a brushed motor.

What you need..
Steel drum balanced w/accurate weight
A way to spin it by the motor (simple chain drive is easiest)
RPM sensor on drum/shaft
Software to translate the data

Companies offer the software w/sensors...around $1K.

Should aim higher on watts, My 7XL and 9XL on 5s will pull 1900 watts peak, and i know there are stronger motors out there. People like Promod, CHC, Aquwt and the Bomb-proof guys are eclipsing that easy right now. all you need is an eagletree and a calculator for real world figures, but it would be cool to see max loaded numbers. BTW how many watts is there to 1 HP? I have heard its somewhere between 740 to 750 but never have heard a definate number

745.7watts=1Hp

thanks

I agree. Aim Higher. There are many out there surpassing those numbers now. Crazy, The eagletree will give you real world INPUT power nummbers, but not output numbers.

I saw a video somewhere around here of a nitro motor dyno, all you would need is an adapter to mount an electric motor in it and it should do the job. The dyno doesnt know what is generating the power, it just measures the power being generated. Putting an eagle tree on the input side would give you a comparision of input power to output power and allow you to measure overall system efficency. That would be really cool.

I would love to see something like this come together any way that it can happen. Its just that kind of tool that will tell how much better the high end motors are than the less expensive versions. I suspect it will be an EXPENSIVE project though.

Yes, it could be expensive. I have a number of potential ideas and concepts right now on this. One of them might just work out.

Keep the ideas coming guys........

BTW, Bomb_proof the power supply would be the only way (well maybe not the only way) to keep repeatable voltage and current numbers for DYNO accuracy. Batteries would not provide the consistency. Now potentially several car or marine batteries in series could but then there would be no way to control the voltage supply to the esc. You would be stuck whatever the battery voltage was.

It would be great to have the supply to mimic the voltage of the cells being used. 3s, 4s, 5s, 6s, etc.

Yeah, I didn't think before posting, you're right i'm pulling 1900watts peak out of the batteries. It would be good to see real world efficiency numbers, not the ones that the manufacturer puts up

Perhaps aiming for 3000 watts would be the starting point and hopefully higher if it's possible. That would give us a 4HP capacity. More than a 540 based motor is likely to produce.

Using quality batteries for powersupply is best method, and real world results. A perfect power supply will fluff the numbers and make them higher.

My concern is about consistency. batteries vary batch to batch, brand to brand, and by number of cycles.

I think you'd want to do both methods. Components should be compared under controlled conditions.

If you want a good reference, you woul need a killer controller to start with.. only controller i know that is capable of pushing i that far is the kontronic 63V. it´s not impossible to do though, but i don´t see it happen..