Hub motor used in Flykly

[ajaybharadwaj]

Hi all,
May not be a super useful for high speed enthusiasts, but I am thinking if its possible to build something like what FlyKly has done.
https://www.youtube.com/watch?v=_Hm_lb2anF0

He has integrated all of the stuff into a wheel so small. I am a noob in this area and wanted to know how he built this?
What kind of motor did he use and where did he stuff all the battery in?

I purchased 250W hub motor with a controller which is 3 phase and is heavy as hell (about 20 pounds phew, just moved it to my garage). I just ran it with a Li-ion pack i built and it was running ok. Had a small ride, good but not great.

Can you guys help me how to get started in buying a motor that is similar to the one used in the video? Also, some more knowledge about what kind of motor to use brushed vs brushless, geared vs un-geared, single phase vs three phase.

my requirements are straight forward, it has to be light ( ~7 pounds), high torque not necessary but reasonable speed of 15 miles should be fine.
Any idea how Flykly managed to cram so much of electronics into the small tiny wheel?

Go green to save the world
Ajay

 

[bowlofsalad]

Hello,

Welcome to the forum.

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Can you guys help me how to get started in buying a motor that is similar to the one used in the video?

Why not simply buy the hub in the video? Easy to find using the keywords "FlyKly electric bike kit", words copied from the video description. I know of nothing else that has that all-in-one like it is.

Any idea how Flykly managed to cram so much of electronics into the small tiny wheel?

Likely has plenty to do with the width of the hub, looks/sounds like it's only compatible with a single speed gear in a 135mm typical dropout spacing. In other words, the hub looks to be substantially wider than most hubs are, most rear hubs are designed to be able to fit a 7 speed cassette/freewheel.

5.5lbs is extremely light in the world of electric bicycle hubs, I have a very short list of hubs that are lighter. Keyde, Q75 (3lbs), Q100h(4.8lbs), Q85. But only the keyde integrates the controller, none integrate the battery (keyde also has a poor track record in reliability so far as I have found).

On a mildly related note, lighter hub motors are good for spoke/rim longevity. Smaller diameter hubs also potentially mean a somewhat stealthier look. Some potential down sides I see to this configuration is a proprietary battery, meaning it's not likely you are going to be replacing the battery with anything other than what flykly makes and sells. With everything inside the hub troubleshooting could be significantly more difficult, and a lack of ebrakes makes this system somewhere between illegal in some places and straight up dangerous (not everyone agrees that ebrakes, which tell the motor to cut power, are essential). I'd be at least mildly worried about using a kit that lacks at least ebrakes, but I personally prefer to be extra cautious and always include a hard kill switch/plug which removes power from the bike if needed. A single front brake might not be enough stopping power, stopping distance is important, blah blah (insert more overly worried for yours and my well being comments here). I will say this though, the lack of wires is sure to make for an attractive looking setup. Some of my setups look like they were made by the borg at one point.

 

[spinningmagnets]

The magic pie V4 and V5 both have the controller (plus much of the wiring and connectors) built into the center of the hub motor. The only thing that is separate is the throttle and battery. Maybe worth considering?