Justins presentation on Hub motors (88min YT vid)

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Lock   10 GW

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Justins presentation on Hub motors (88min YT vid)

Post by Lock » Dec 27 2011 11:14am

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Re: Justins presentation on Hub motors (88min YT vid)

Post by retread » Dec 27 2011 2:16pm

Thanks for posting this Lock.

Although I was sitting right behind the camera, I'll have to watch the talk again to see if I missed any details.

Good job Justin!
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Re: Justins presentation on Hub motors (88min YT vid)

Post by Farfle » Dec 27 2011 2:41pm

Wow, LOTS of good information there, I love the water ingress-egress problems, never expected water to wick thru the seals at such a speed.
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Re: Justins presentation on Hub motors (88min YT vid)

Post by amberwolf » Dec 28 2011 12:27am

"I've amassed an enormous amount of experience, most of it unwanted, some of it enlightening" :lol:

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Re: Justins presentation on Hub motors (88min YT vid)

Post by parabellum » Dec 28 2011 1:40pm

Thanks, Lock for posting, Justin for outlining problematic and ideas for solutions. :)

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Re: Justins presentation on Hub motors (88min YT vid)

Post by Ypedal » Dec 28 2011 2:00pm

awsome video.. i love the geared to DD prototype idea !!!
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Re: Justins presentation on Hub motors (88min YT vid)

Post by ZOMGVTEK » Dec 28 2011 10:57pm

Nice video with some useful insight.

YouTube never fails to disappoint with its streaming speeds. Is it that common to not be able to stream YouTube videos, at any reasonable quality? It took over 3 hours to download the 1080P version, meaning it would take about 2 hours of buffering before it would play uninterrupted. It's not my network speeds, its just them.

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Re: Justins presentation on Hub motors (88min YT vid)

Post by ohzee » Dec 29 2011 12:29am

I just grabbed the 1080 version in under 30min , but i used some you tube down loader.

http://www.youtubedownloadersite.com/

Also agree some good information in this video. Justin is pretty good on camera talking to an audience I enjoy watching him.

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Re: Justins presentation on Hub motors (88min YT vid)

Post by Alan B » Dec 29 2011 1:01am

Very nice, thanks to Justin et al.

So the Magic Pie has no advantage over the 9C on the dyno. Interesting.

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Re: Justins presentation on Hub motors (88min YT vid)

Post by MattyCiii » Dec 29 2011 11:24pm

WOW.
Thanks Justin for all the intellectual effort and having a passion for the sport.
Thanks Lock for posting the video.

F'n wow.
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Re: Justins presentation on Hub motors (88min YT vid)

Post by spinningmagnets » Dec 30 2011 10:25am

...I love the geared to DD prototype idea !!!
At 1:14:45 near the end. It sounds like a retro-direct (Miles?), and it looks like he is showing a prototype running (9C sized) at 1:16:39. In a geared hub, the motor normally runs in reverse, and the "torque improving" gears convert that movement into forward motion in the process of transmitting the power from the motor to the rim.

When he reverses the motor, it locks up like a direct drive for higher RPMs at the same volts?

E-motorcycles desperately need this, and its the next major improvement that I think would benefit them the most...

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Re: Justins presentation on Hub motors (88min YT vid)

Post by retread » Dec 30 2011 12:55pm

spinningmagnets wrote:
...I love the geared to DD prototype idea !!!
At 1:14:45 near the end. It sounds like a retro-direct (Miles?), and it looks like he is showing a prototype running (9C sized) at 1:16:39. In a geared hub, the motor normally runs in reverse, and the "torque improving" gears convert that movement into forward motion in the process of transmitting the power from the motor to the rim.

When he reverses the motor, it locks up like a direct drive for higher RPMs at the same volts?

E-motorcycles desperately need this, and its the next major improvement that I think would benefit them the most...

I think that's where he says my name, "Mick." He was just mentioning that we started work on this years back, and yes, e-motos are very much in need of this, and I personally can't wait for that since I'm kinda out of the ebike scene now (health). Like Justin said, the system can be automated to switch drive modes on the fly automatically, or it can be done manually, but auto would be the obvious choice for a motorcycle. 2-3 times the thrust of a direct-drive motor off the line would be pretty sweet :)

To answer your question: when the rotor is in reverse, the hub is in low mode -- like a typical geared motor -- and the hub (outer casing / wheel) spins forward at a rate set by the planetary gears and voltage on the rotor, but when the rotor is reversed, into the forward direction (so, same as the hub), it goes into direct-drive mode, which means it spins the hub much faster (1:1) for the same voltage. It's somewhat hard to see on this particular video the reversal happening, but it does so literally faster than one can discern. One moment is running backwards, the next instant forwards, with seemingly no transition. It's pretty cool to watch up close.
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Re: Justins presentation on Hub motors (88min YT vid)

Post by Miles » Dec 30 2011 1:55pm

retread wrote: I think that's where he says my name, "Mick." He was just mentioning that we started work on this years back, and yes, e-motos are very much in need of this, and I personally can't wait for that since I'm kinda out of the ebike scene now (health). Like Justin said, the system can be automated to switch drive modes on the fly automatically, or it can be done manually, but auto would be the obvious choice for a motorcycle. 2-3 times the thrust of a direct-drive motor off the line would be pretty sweet :)
That's cool. I didn't know Justin had actually done some development on this when he commented before or I would have been more tactful... :)

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Re: Justins presentation on Hub motors (88min YT vid)

Post by neptronix » Jan 06 2012 2:39am

After paying full attention to the water ingestion part.. I am thinking... maybe a chain drive build next would be best..

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Re: Justins presentation on Hub motors (88min YT vid)

Post by dogman dan » Jan 06 2012 6:40pm

80% of his motor problems from water. Wow, makes me so glad to be living in a desert. I'm in ebike heaven. :mrgreen:

Gonna have to watch that about 6 times to get it all straight. The part about cogging I found really interesting. I keep saying cogging increases with the speed you try to pedal an unpowered motor. Now I have proof of Justin saying it too. The hysterisis varies by rpm.

Really great that he spends the time to investigate this stuff, and try to design a better motor.

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Re: Justins presentation on Hub motors (88min YT vid)

Post by cell_man » Jan 07 2012 4:00am

Very interesting and informative presentation.

I had the pleasure of meeting Justin in November when he was over in China. He was great and gave me lots of useful info, he stayed all day at my place and got a Taxi back to Ezee late in the evening. Justin is so free with his info, very generous indeed. Can't fault him, apart from he's maybe a bit too smart..... :)
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Re: Justins presentation on Hub motors (88min YT vid)

Post by bigmoose » Jan 07 2012 9:10am

Great presentation! The you tube title says it was given at VEVA. Anyone know what that is? Vancouver Electric Vehicle Association?
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Re: Justins presentation on Hub motors (88min YT vid)

Post by Lock » Jan 07 2012 11:39am

bigmoose wrote:Great presentation! The you tube title says it was given at VEVA. Anyone know what that is? Vancouver Electric Vehicle Association?
Exactly right:
http://www.veva.bc.ca/home/index.php

"On paper" lots of content about electric cars but they have a nice sub-set of ebikers... They meet once a month for "The Kilowatt Hour":
http://www.meetup.com/vancouver-electri ... /40850122/

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Re: Justins presentation on Hub motors (88min YT vid)

Post by El_Steak » Jan 07 2012 6:15pm

Very impressive. Great to see someone this smart so passionate about ebikes.
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Re: Justins presentation on Hub motors (88min YT vid)

Post by darkshirikens » Jan 16 2012 6:25am

I have to say that has to be the best and educational videos I've seen Justin do, I also admire his dedication to the ebike revolution like some of the motors i seen on his videos ive never seen the insides of them and always have wanted too just to see whats out in the market of LEV's thanks to his videos i feel as though im getting a little closer to what kind of knowledge i want to have about electric motors in particular :D
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