Ideas for dynos

Electric Motors and Controllers
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Arlo1   100 GW

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Re: Ideas for dynos

Post by Arlo1 » Nov 26 2012 11:17am

I never did a build thread for mine but here is a picture of my inertia motorcycle dyno and my smaller scooter/e-bike dyno. The roller on the big dyno weighs 634.5 lbs and has a movement of inertia of 8.66889 kg.m/\2 I will likely add a eddy brake in the future and I am currently using simpledyno software. I would like to log amps and volts during a run so we can measure system efficiency. I have been looking at the performance trends boxes http://performancetrends.com/DataMitePricesOnly.htm for adding sensors.
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027_renamed_9423.jpg
scooter/ebike dyno
027_renamed_9423.jpg (102.01 KiB) Viewed 4485 times
001_renamed_25919.jpg
001_renamed_25919.jpg (93.01 KiB) Viewed 4485 times
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
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HAROX   1 kW

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Re: Ideas for dynos

Post by HAROX » Nov 26 2012 11:29am

I'm always acutely aware of how simple your posts are to read and to navigate. The case in point today is your listing of these dynos. You list them as "adrian's dyno" or "burtie's dyno", and when I click the link, I find the corresponding thread title is different from your listing.
Not to detract from your message, but some time would you explain how you do this? I may be computer challenged, however I don't think I'm the only one here who would learn from your sense of order.
Thanks for keeping your stuff so fastidious looking, Miles. It's highly appreciated!


Post Script-WOW!
With totally generous natures, Miles and Arlo both have given up secrets to making our posts look plenty good! See their tips below.
(Now, back to reading about strain gages and other dynamite stuff. Thanks for the links.)
Last edited by HAROX on Nov 26 2012 12:26pm, edited 1 time in total.

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Arlo1   100 GW

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Re: Ideas for dynos

Post by Arlo1 » Nov 26 2012 12:13pm

HAROX wrote:I'm always acutely aware of how simple your posts are to read and to navigate. The case in point today is your listing of these dynos. You list them as "adrian's dyno" or "burtie's dyno", and when I click the link, I find the corresponding thread title is different from your listing.
Not to detract from your message, but some time would you explain how you do this? I may be computer challenged, however I don't think I'm the only one here who would learn from your sense of order.
Thanks for keeping your stuff so fastidious looking, Miles. It's highly appreciated!
Harox when you are typing a message there is a row of options above the message you are typing Starting with "B" on left side and ending with "youtube" on the right.
These are the fetures you can use to do things to make your post more fancy. If you hover your mouse over them it will tell you how to implement them. What you are loking for is the "URL" feature. You just copy your link you want to use them use the url feature and name it what you want.
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Nov 26 2012 12:13pm

Thank you HAROX!

Here's what it looks like in the posting editor (ignore the asterisks):
[*url=http://www.endless-sphere.com/forums/vi ... 30&t=36803]acuteaero's dyno[/url*]

The process is:

- Paste the link from the thread you want to reference into the posting edit window.

- Highlight it with the cursor.

- Click on the URL button.

- Delete the first close brackets character "]" and replace it with an "= "

- Insert a "]" after the link

- Insert the text that you want to display between this "]" and the "[/url]"

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Nov 28 2012 3:39am

Added to the list:
Jeremy's dyno

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Dec 01 2012 5:28am

Still thinking about what I can cobble together for my first dyno...

It would be nice to have something that could test the efficiency of transmissions and gearboxes, too.

Anyone think using a hydraulic disc brake system from a motorcycle, partially submerged in a water bath, would be feasible? Coupling would be via synchronous belt drive.

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adrian_sm   10 MW

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Re: Ideas for dynos

Post by adrian_sm » Dec 01 2012 5:51am

I haven't tried it, but gut feel is that it would be hard to control the torque accurately due to th variation in friction due to heat or water boundary layer effects. Eddy current brake on paper would be a better bet. I reverted to this (using a magnetic cycle trainer) to do some short high load point data for my testing last night.

Question for those with real dynos. How well does the torque correlate with the motor and battery current at full throttle, no controller current limit situation?

Just wondering how crude an efficiency estimate would be using:
Power-out = Kt * (Current - No Load Current) * Wheel rotational speed
Power-in = Volts * Amps
Efficiency = P-out/P-in
Build #1 ~28kg ~ 700w Avanti Hardtail Crystalyte 408, 48V10Ah Headway. ~5500 kms to date. (retired)
Build #2 ~30kg ~2000w Giant AC Dually Crystalyte 408, 48V10Ah Headway + 6s10Ah LiPo = 70V. ~15000 kms to date [SOLD]
Build #3 ~13kg ~2000w Commuter Booster <1kg Friction Drive
Build #??? ~21kg ~1500w Adrian's Bafang BPM Hardtail MTB Bafang BPM code12, 15s LiPo, ~40kph, ~30kms

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Dec 01 2012 6:17am

adrian_sm wrote:I haven't tried it, but gut feel is that it would be hard to control the torque accurately due to th variation in friction due to heat or water boundary layer effects.
Thanks Adrian,
That seems to be the problem that Jeremy encountered with his disc brake dyno. By using a larger disc and running it in a large enough bath, the temperature variation shouldn't be that great? A finer control should be possible on the hydraulics than on the cable system Jeremy used.

I'll certainly investigate cycle trainers.

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adrian_sm   10 MW

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Re: Ideas for dynos

Post by adrian_sm » Dec 01 2012 6:30am

I think docbass gutted exercise bikes for his. Better than the wheel driven type I have, as you could couple the motor more easily, and the quality would be better if you can get a scrapped one for cheap.

[EDIT] Link to Doctorbass's dyno thread
Build #1 ~28kg ~ 700w Avanti Hardtail Crystalyte 408, 48V10Ah Headway. ~5500 kms to date. (retired)
Build #2 ~30kg ~2000w Giant AC Dually Crystalyte 408, 48V10Ah Headway + 6s10Ah LiPo = 70V. ~15000 kms to date [SOLD]
Build #3 ~13kg ~2000w Commuter Booster <1kg Friction Drive
Build #??? ~21kg ~1500w Adrian's Bafang BPM Hardtail MTB Bafang BPM code12, 15s LiPo, ~40kph, ~30kms

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Arlo1   100 GW

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Re: Ideas for dynos

Post by Arlo1 » Dec 01 2012 10:04am

I think the trailer brakes they use for small trailers may work nice as well they are little electro magnets that you vary the power to to vary the amout of brakes.
I wonder how much power you can pull from just the magnet... http://www.princessauto.com/pal/product/8212078/
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

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Arlo1   100 GW

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Re: Ideas for dynos

Post by Arlo1 » Jan 26 2013 12:58am

Ok so im going to order the dyno datamite usbIII from performance trends
I might opt for the 100$ pro software option. I need something that can do all this for my buisness as well as further proper acurate testing of electrics.

Any sugestions are welcome. I would love to build my own with ardrino or something cheep and write my own code etc but I have very little extra time.
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

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Arlo1   100 GW

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Re: Ideas for dynos

Post by Arlo1 » Feb 11 2013 1:33pm

The guy from Simple dyno Damon ( think that's his name lol) is going to move forward with an Arduino based setup so we can sample Volts and Amps on the fly and log them into the Simpledyno program. The arduino uno is what he plans to use so I will order one or 2 lol looks hand for other things. But I like the DIY idea and in the future I should be able to add a load cell this way.
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

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Toorbough ULL-Zeveigh   10 MW

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Re: Ideas for dynos

Post by Toorbough ULL-Zeveigh » Feb 12 2013 5:14am

Kick down the barricades Listen what the kids say.
From time to time people change their minds But the Frock is here to stay.
I've seen it all from the bottom to the top Everywhere I go the kids wanna Frock.
Around the world or around the block Everywhere I go the kids wanna Frock.

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Feb 12 2013 6:21am

Toorbough ULL-Zeveigh wrote:die Furtz Dyno

(DSTM)
LOL!

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Farfle   1 MW

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Re: Ideas for dynos

Post by Farfle » Feb 12 2013 11:59am

Lotsa safe in that there thread.
Test Review Revise Repeat

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Feb 12 2013 12:06pm

He's clearly found his new home....

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Arlo1   100 GW

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Re: Ideas for dynos

Post by Arlo1 » Sep 16 2013 12:22am

Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

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Miles   100 GW

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Re: Ideas for dynos

Post by Miles » Sep 16 2013 10:43am

Arlo1 wrote:Here is a link for mine. http://endless-sphere.com/forums/viewto ... =1&t=53617
Great! I've added it to the list Arlo.

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