Luke's commuter bicycle. What Non-hub is all about.

[liveforphysics]

Luke, any exciting stories you would like to share ? If it is still your daily commuter then I wonder how many cars and bikes you have slaughtered at the traffic lights.

I'm quite sure the number is all of them 8)

Bingo.

My bicycle has lost to no bike or motorcycle on the street that it's encountered. It's a ripper, and commutes go very smoothly and make excellent time.

 

[nechaus]

I wish i could see a video of your agni bike vs your gm bike!!!

 

[cjrodrigo]

Hi Luke... that looks a neat agni bike... i am a designer and would like to start my own company and race motorcycle one day... i would like to know if you could help or rather be a part of my dream to start a motorcycle company .... you seem to know more about these motors and also worked with lynch... let me know what you think about this... you can contact me on cjrodrigo7@hotmail.com... hope to hear from you soon....

 

[Dauntless]

You need to tell him what state you're in so he knows whether your minimum wage is high enough for him.

 

[spinningmagnets]

Perhaps we could assemble a parts list for a "Coma" bike (Deathbike Jr?) for those who don't need to do power wheelies all the way up to 60-MPH, in a bike that is 100-MPH capable (if the road is long enough).

The 10-kW Golden motor that Luke is using is listed as 17-kg, 206mm diameter by 170mm.

http://www.goldenmotor.com/, Click on "BLDC Motor" on the left column.

They also list a very similar 5-kW, and if geared for 50-MPH instead pf 100-MPH, wouldn't torque be close? This motor is listed as 11-kg, 206mm diameter (same as the wider 10-kW model) 126mm wide. Roughly 30% lighter and 20% narrower?

5-kW shaft diameter listed as 22.2mm diameter, 10-kW is 25.4mm, $446/$765...
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Thud posted two potentially useful sine/cosine encoders:
http://www.quantumdev.com/products/optical_encoders/sc12.html
http://ab.rockwellautomation.com/Motion-Control/Sine-Cosine-Absolute-Encoder
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Alltrax 72V / 200A (Luke recommended this controller family, but he used a higher voltage and higher amp model on the Deathnbike)
http://www.electricmotorsport.com/ev-parts/controllers/alltrax-spm-72200-24-72v-200a.html
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I seem to remember he was using #428 chain and sprockets.
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[MitchJi]

Hi Ron,

Perhaps we could assemble a parts list for a "Coma" bike (Deathbike Jr?) for those who don't need to do power wheelies all the way up to 60-MPH, in a bike that is 100-MPH capable (if the road is long enough).

The 10-kW Golden motor that Luke is using is listed as 17-kg, 206mm diameter by 170mm.

I don't think sourcing an appropriate motor is difficult. But getting a Sevcon programmed is a non-trivial exercise:

Two nice things about the sin/cos sensor:
    * It gets the position sensing element out of the stator heat flux
    * It allows precise timing advance with the right controller just like a timing map in an IC ECM

Yes sir it does. We did it mainly for the heat reason you mentioned, as hall melting failure was our demise at the last race event, as well as a previous race.

The second reason you mentioned wasn't really something we were needing for this application, but WOW! It just make it silky smooth, no more chug-chug-chug at low RPM's as each hall sensor latches and tells the fets to switch the next coil on, it's just silky now, you can make the motor spin so slowly you can barely see it moving at all, and it's just perfectly smooth with no torque ripple noticed at all now. Really feels like electric power should feel at all RPM's rather than little bumps of torque pulses when you're at low speeds.

It directly takes the Sine/Cosine input from the encoder. I think it's good to 0.25deg rotor position if I'm not mistaken. The halls were good to 6deg resolution (10 poles, 3 halls on 120deg spacing)

It's fun having this much torque too, I just nosed the front wheel up to a staircase outside a strip mall, and in a very slow controlled calm way, just torqued up the 10 stairs or so and rode along the sidewalk path at the top. It felt even easier than walking up stairs, though the seat does kinda smash into your ass as the rear tire goes over each step. I don't know that it would have been possible to do it so effortlessly on hall sensors.

Luke,
Do you have an opinion of the stock golden motor controller for use in a low -mid power set up? I imagine it uses hall sensors that come installed in the golden motor.

I've got one. It's 6x6 of TO220 package fets (36 fets), with a good layout and good power busing. Crappy caps, and sadly, the control firmware is glitchy and they occasionally just explode.

The Sevcon on this bike is 16 x 6 fets (96 fets), and it's rock solid an reliable, ONCE TUNED. It's like a death in the family to get tuned, it's going to leave you with a week of frowning and restless sleep, and thousands of dollars in labor with an expert dyno tuning your setup to get it to operate. Once you have it operational, it's like stepping into heaven everytime you operate the vehicle.

Which is like exactly backwards of a Kelly, which takes about 20 minutes to get everything hooked up and adjusted and tuned, followed by a lifetime of hating all it's glitchy crap performance, ending in it's death at some random moment when you need it most.

Or you could build your own Lebowski controller (or wait for Arlo or Zombiess to sell you one):

That is awesomely smooth and controlled and silent in your video.

People don't realize how much better it is to ride. I want to see Lebowski brains in every motor controller for every bicycle or EV or RC model or whatever. This is next generation motor control.

[youtube]ISMXZWT1VBY[/youtube]
[youtube]2f4Asgt1gjY[/youtube]

This is the same controller but now I'm using a 100V pack trying to stress the components even more. Almost all the noise you hear from the bike is coming from the freewheel clicking and air moving around the bike. The motor is virtually silent with this controller.

And don't forget the very heavy duty (motorcyle?) disc brakes!