Kickbike Electric Scooter Build

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jlust286   10 µW

10 µW
Posts: 6
Joined: Mar 05 2013 10:33pm

Kickbike Electric Scooter Build

Post by jlust286 » Jun 13 2016 12:13pm

I have been obsessing lately about making an electric bike for my wife. She does not like bicycle seats I want her to join the family for short bicycle rides. I had a great idea about making an electric scooter so she doesn't have to sit on a wedgie seat and since it is electric she could keep up with everyone. Also a scooter is easy to get on and with electric power she does not need to get sweaty or change into athletic clothing. I decided on a Kickbike because it is stable and strong enough to even go over dirt paths. I wanted this scooter to not just be electric throttle but I also wanted it to be electric kick assist so it would get good range with a small light battery while encouraging exercise. But since a scooter naturally doesn't have pedals, a pedal assist sensor does no good. I ended up coming up with a way to mimic the pedal sensor so that it would be kick assisted.

To mimic the pedal assist sensor, I used an infrared proximity switch mounted low to the ground with a short range to detect the kick. The infrared switch triggers a timer circuit to power a square wave pulse generator for a few seconds which mimics the pedal sensor. As a safety, this is all activate upon standing on a momentary switch mounted in the deck and cuts power to the motor if stepped off the deck. This set up allows the scooter to be truly kick assisted requiring frequent kicking to power the scooter. The power of the motor drives the scooter faster and farther than kicking alone so she can keep up with the family while still getting some exercise and without sitting on an uncomfortable seat.

Powering the scooter is a Q100H 36 volt front hub motor and S06S sine wave motor controller with LCD screen from BMSbattery. The batteries are two Turnigy nano-tech 5000mah 5S 25~50C Lipo Packs from HobbyKing connected in series for a 10s pack and managed by a BMS from BMSbattery. The batteries are stored in a handlebar bag from Banjo Brothers and the controller is mounted to outside of the bag.

This thing is a lot of fun to ride and I have a feeling my daughter and I will be using it the most. I like that the S06S with the LCD has several power settings so I can gradually work up to a faster speed. This helps the scooter blend with whatever speed the family is traveling at combined with how frequently the rider is kicking.
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Kickbike
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Infrared switch mounted to frame
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Controller mounted to handlebar bag
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Inside the handlebar bag
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Safety switch in deck
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The infrared switch was bought from Amazon:
https://www.amazon.com/gp/product/B00AM ... UTF8&psc=1
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Infrared Switch
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The timer circuit purchased on eBay:
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Timer Curcuit
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The square wave pulse generator purchased on eBay:
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Square Wave Pulse Generator
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Last edited by jlust286 on Jan 23 2017 4:10pm, edited 1 time in total.

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dequinox   10 kW

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Posts: 850
Joined: Oct 31 2009 1:43pm
Location: Eugene, OR

Re: Kickbike Electric Scooter Build

Post by dequinox » Jun 13 2016 3:32pm

Neat build! I love that you've incorporated the pedal assist via infrared sensor... that is baller. This is quite well thought-out!
On a dusty pew in a vestibule sits the Devil playing pocket pool, he's waiting for the next poor fool who forgot that it was Sunday

STABLE:
HI-V (Retired); Sun Cruiser w/ Hill Topper Kit; Giant Simple Cruiser w/ Amazon 1000W Front Hub.
Parts donated by Rassy and Greenerwheels have made many of my builds possible, THANK YOU!!!

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Wheazel   10 kW

10 kW
Posts: 967
Joined: Nov 02 2010 2:30pm
Location: Sundsvall, Sweden

Re: Kickbike Electric Scooter Build

Post by Wheazel » Jun 14 2016 8:13am

Awesome creation, have been thinking about a custom kickbike type ride myself. This certainly is inspiration!
What was the reason you went for a front hub and not a direct drive rear hub with a more favorable torque situation in the smaller wheel?

leo99   100 W

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Joined: May 22 2014 3:10pm
Location: lausanne, VD, switzerland

Re: Kickbike Electric Scooter Build

Post by leo99 » Jun 14 2016 9:31am

I love the infrared sensor, great job
2011 hardtail scott BBS02 750w with em3ev 14ah 29e pack - sold
Stealthy q100cst 201 with 14s 6ah battery at 15 amps
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jlust286   10 µW

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Posts: 6
Joined: Mar 05 2013 10:33pm

Re: Kickbike Electric Scooter Build

Post by jlust286 » Jun 14 2016 9:35am

The front of the bike is pretty heavy. I originally wanted to go with rear drive and weld a custom rear rack to go over the wheel but the rear dropout spacing is only 65mm with an 18" tire. It would have been more work than I wanted to convert it to a wider dropout spacing for the motor. I know some of the Kickbike models have a 20" wheel so they might have wider dropouts but I don't know. If they are wider then I might have to make another Kickbike for myself with a rear drive and rack.

agilehumor   1 W

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Joined: Jun 01 2016 12:24am
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Re: Kickbike Electric Scooter Build

Post by agilehumor » Jun 24 2016 8:06pm

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