Dyno for EU testing

[Joff]

I am wondering if anyone has a device for measuring the actual power and torque output at the wheel. Seems like it would be an easier thing to make than an electric unicycle. 

[Hunka Hunka Burning Love]

@EcoDrift has a dyno testing rig that they used to check out a few wheels.  Them Ruskies are always a few steps ahead of the game.  

 

Edited April 4, 2018 by Hunka Hunka Burning Love

[Chriull]

14 hours ago, Joff said:

I am wondering if anyone has a device for measuring the actual power and torque output at the wheel. Seems like it would be an easier thing to make than an electric unicycle. 

 

5 hours ago, Hunka Hunka Burning Love said:

@EcoDrift has a dyno testing rig that they used to check out a few wheels.  Them Ruskies are always a few steps ahead of the game.  

Also e-wheels.de ?once had?/has a dyno for testing.

@EcoDrift stated in the russian forum that new Kingsongs cannot be tested anymore on a dyno (unfortionately without explaining the reason) and something like new EUCs are strong enough so he won't make any further tests... ?

https://electrotransport.ru/ussr/index.php?msg=1224593

Edited April 4, 2018 by Chriull

[Joff]

Car dyno!  I was picturing something a lot smaller that  could be made economically for the more modest power of a EU. Like a wheel with a pulley that turns a modified alternator to provide an adjustable load. I was also surprised the dyno was only being used to test stock EUs. I  figured there must be people out there making modifications that want want to see measurable results. 

[IamIan]

We might be able to beef up a little something like the dyno made here .. DIY Dyno 800-1500 watt motor .. they spent less than $400 in materials.

Or

for $3500 they make a go-kart scale sub 20hp dyno ... https://www.mittlerbros.com/Chassis-Dyno .. no EUC would need more than 20hp dyno.

or

does anybody live in an area with allot of go-kart racing / riding ??

find someone who already bought the go-kart dyno .. maybe just pay to do the test itself .. just like only pay to test on a car , don't have to build or buy the whole dyno.

 

[RagingGrandpa]

For posterity: some 2023 dyno data surfaced in the thread below, see more discussion there.

https://forum.electricunicycle.org/topic/20470-understanding-the-real-world-considerations-and-implications-of-speed-vs-torque-models/?do=findComment&comment=486625

[daniel1234]

I wanted to build EUC dyno myself - But I didnt have enough space in my flat to have it there all the time. It is still interesting project to do.
There are few thing to think about:

- Cost / final size of rig

- How to properly mount and secure EUC 

- Breaking / resistance capability. How to get properly variable load to simulate ride. 

- Where heat goes and how to measure calibrate it to get usable result

I think there are two cost effective options to explore:

- Using another HUB motor with VESC like break and measure data through VESC interface. I got Superflux for this purpose(It is wider than most EUC tyres). Laying unused since i don't ride OW much. 

- Using one or two truck Alternators - producing DC and Measure power out. 

If somebody want me to build him DYNO rig, for EUC I am up to task . 

Edited November 7, 2023 by daniel1234

[RagingGrandpa]

Inmo disclosed some images of their production test dyno... but it seems to only make a constant drag, and doesn't stress the EUC very much.

  

On 10/31/2023 at 11:56 AM, Jason McNeil said:

Jack just got back from the Inmotion assembly facility today, with a bunch of pics/videos... 
- All V11Ys were dyno tested using a constant 30Nm of resistance

     

[okvp]

Here is a REAL DIY guy explaining basics of different dyno types and building a brake dyno (for moped) from a scratch.

 

 

 

 

 

Edited November 17, 2023 by okvp