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<<   作成日時 : 2010/12/13 01:10   >>

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昨今、EV車の小型モーターやパワーを強化する研究が進んでいますが、それをインラインに応用した、とんでも無いアニメ "Air Gear" のエアトレックような電動インラインを考案した人がいるようです。

その後、2010年1月16日の深夜23:30から TBS TV で放送された、雨上がり決死隊が司会の「革命×テレビ」の中で、この RazErBlades が紹介されました。

Electric Vehicles
In recent years, I've taken on a keen interest in electric vehicle technology. To that end, I've built several small electric vehicles which demonstrate propulsion technologies and nonstandard powertrain architectures, as well as motor control systems and user/operator interfaces. These projects, unless otherwise described, have been products of free time and not funded or supported officially by MIT.

RazErBlades demo at the maker faire NYC 2010


http://www.youtube.com/watch?v=ZagK4dtr42w

Research Vehicles

RazErBlades


The RazErBlades are another bid to motorize that which should probably remain unmotorized. Born partially out of peer pressure and partially out of curiosity, the skates use RazEr's motor technology and are filled with lots of firsts for me - namely, custom PCB design, wireless communication, and user interface design.

Razor Scooter with RazEr's motor


Alright, alright. So I've finally caved into peer pressure and miniaturized the tech from RazEr's motor even more such that they fit in a set of 100mm skate wheels.

Now, there have been many electric skate products in history. But they've all been either…
  • Unwieldy and large, such as having power units attached to the back of a conventional skate boot, or an right angle drive sticking out of the boot footprint, or even worse…
  • Cable (flexshaft) or shaft driven from a backpack or waistpack-like structure, which really seems like a bad idea in terms of ergonomics, and I can't imagine as being very efficient.
  • Wire controlled, which brings with it risks of entanglement and tripping

Therefore, RazErblades are designed as an experiment to address those shortcomings which, in my opinion, have prevented motorized skates from emerging as a significant market (you know, besides the whole amplified risk of dying a bloody, cranially traumatic death). The ‘blades have the following characteristics:
  • All-wheel drive with four hub motors, which are the most compact drive solution possible. The motors add minimal drivetrain drag to the system, so the skates can still be used normally. I contend this should always be available as a backup propulsion method for small electric vehicles.



  • 100% self-contained. All of the batteries and controls are contained within the skate body, and each skate frame is effectively a single-channel motor vehicle. No power is shared between the two units. There is of course then the downside of uneven battery life depending on which side of your body is dominant.
  • Controlled wirelessly via 2.4Ghz radio modules. Not only does this keep the hands free to perform standard skating motions, but also allows for creative control methods. I've integrated the throttle into one of the wrist guards, which is equipped with force sensors to read applied forearm and wrist bending force. The wrist guards constrain physical movement, therefore making detection of force relatively easy.

First Ground Test


http://www.youtube.com/watch?v=RGO1DJglScw

Street testing


http://www.youtube.com/watch?v=5dV7-bU6Css
The build log for the RazErBlades can be found in its (their?) category.

RazErBladeSpecifications: (For one power unit; a complete set is, of course, two)
  • Vehicle: Electric inline skate (Rollerblade Bravoblade GLX base)
  • Drivetrain: 2 wheel direct drive
  • Mechanical: 6061 aluminum skate frame, ABS and various plastics upper
  • Motor: 2 100 watt custom BLDC hub motors
  • Controller: Maxon 380200 DEC 50/5 BLDC control module DIGI XBee 2.4Ghz 802.15.4 radio modules
  • Battery: 2.6Ah 22.2 volt lithium polymer battery
  • Instrumentation: N/A
  • Top Speed: 10 to 15 MPH
  • Acceleration: …Hopefully not that fast
  • Range: 3 to 5 miles
  • Curb Weight: 6 pounds (2.7kg)


  • RazErBlades: Finally, some real testing

    Here's a short video of Shane taking the ‘blades out for a spin near the south end of campus. This is still with 50% motor capacity, by the way.
    Once I'm able to get the left side motors magneted up, I'll gather some people to take real running video. Hopefully, it will be interesting with all 4 motors, and unless something really dumb happens (like I blow all the controllers or… like… die or something), the thinly-veiled-ground-test at Otakon is on schedule.

    equals zero: http://www.etotheipiplusone.net/ and Electric Vehicles and the 'RazErBlades' Category
    Inline Skating Notebook: Japanese Comic "Air Gear" (Oct. 3, 2005)

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