Self-balancing unicycles at'Paris sans Voiture' (Paris without cars), September 2015
Anelectric unicycle (often initialized asEUC or acronymizedyuke orUni) is a self-balancingpersonal transporter with asingle wheel. The rider controls speed by leaning forwards or backwards, and steers by twisting or tilting the unit side to side. The self-balancing mechanism usesaccelerometers andgyroscopes.[1] Most manufacturers of EUCs are based in China, including Segway, Inmotion, Kingsong, Begode, and Leaperkim.
Similar tohoverboards,Onewheels, andSegways, electric unicycles are self-balancing in a forward and backward direction, with side-to-side (lateral) stability being provided by human steering motions that tilt or twist the unit, similar toBicycle and motorcycle dynamics. The control of a unicycle can be considered to be similar to aninverted pendulum. Many electric unicycles have suspension, either operated by air or springs.
Electric unicycles come in varying speeds, battery capacities, and motor wattages. Low-end models may have speeds up to 15 mph and ranges of 10–15 miles, while advanced models being introduced in 2024 can reach 60 mph and over 100 miles per charge.
A hand-powermonowheel was patented in 1869 by Richard C. Hemming[2] with a pedal-power unit patented in 1885.[3] Various motorized monowheels were developed and demonstrated during the 1930s without commercial success[4] andCharles F Taylor was granted a patent for a "vehicle having a single supporting and driving wheel" in 1964 after some 25 years of experimentation.[5] In 1977 Charles Gabriel presented an electric unicycle that resembles the design of today's devices.[6]
In 2003,Bombardier announced a conceptual design for such a device used as a sport vehicle, the Embrio.[7] In September 2004Trevor Blackwell demonstrated a functional self-balancing unicycle, using a control-mechanism similar to that used by theSegway PT and published the designs as theEunicycle.[citation needed] This approach was further refined by a group of engineering students at the University of Adelaide who developedThe Micycle, which incorporated a hub-motor, a Lithium-Ion Battery and a novel steering mechanism where the wheel pivoted independent of the main chassis.[8]
The Micycle in 2010 with its steering mechanism, hub motor and lithium-ion battery pack
Early units had a seat, which limited how much the unit could be tilted,[9] but this was resolved with the transition to seatless units that could be tilted much more.[10] In March 2010Shane Chen of Inventist filed a patent application for a seatless electric unicycle (associated with the "Solowheel" product launched in February 2011), which uses flat pedals to stand on and leg contact surfaces to allow for stable, precise control in lieu of a seat.[11][12][13] In Oct 2010 Focus Designs published a video of an electric unicycle with hub motor and a seat.[14]Late in 2015, theFord Motor Company patented a "self-propelled unicycle engageable with vehicle", intended for last-mile commuters.[15] Segway launched theirNinebot One S1 model in November 2017.
EUC andmotorized scooter riders participating in a group ride in San Francisco.PPE was worn due to higher top speed with newer EUC models. The man in a red jacket on the left was riding a suspension-model.
By the turn of the decade, several Chinese manufacturers dominate the market and continue to release EUC models with higher top speeds (above 75 km/h or 46 mph),[16] and longer range batteries.
Popularity came around the same time as Begode (formerly known as Gotway) released their M super line. This evolved into the MSX & MSP models and eventually into the RS model. Around this time Veteran stepped on to the scene for the first time with their road wheel the Sherman.[citation needed][clarification needed] In 2020, suspension EUCs were revealed byInmotion,Kingsong and Gotway. After suspension, companies began to work on higher speeds and motor voltages.
RIOT wheel, a ridable single-axis self-balancing unicycle with an unusually low centre of gravity, with its rider in front of, rather than on top of its single wheel[citation needed]
^Kadis, A., D. Caldecott, A. Edwards, M. Jerbic, R. Madigan, M. Haynes, B. Cazzolato, and Z. Prime (December 2010)."Modelling, simulation and control of an electric unicycle"(PDF).Proc. of the 2010 Australasian Conference on Robotics & Automation (ACRA 2010).{{cite journal}}: CS1 maint: multiple names: authors list (link)
Ruan, Jian-Wei Zhao; Xiao-Gang (1 September 2011). "Modelling and Control of a Flexible Two-Wheeled Self-Balancing Mobile Robot".International Journal of Systems, Control and Communications.3 (3):330–355.doi:10.1504/IJSCC.2011.042438.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Ben S. Cazzolato, David Keith Caldecott, Andrew John Edwards, Matthew Anthony Haynes, Miroslav Jerbic, Andrew Christopher Kadis and Rhys James J. MadiganMicycle - A Self-Balancing Unicycle, University of Adelaide, 2010
Ulyanov, S. V.; et al. (1998). "Soft computing for the intelligent robust control of a robotic unicycle with a new physical measure for mechanical controllability".Soft Computing.2 (2):73–88.doi:10.1007/s005000050036.S2CID17955504.
Sheng, Zaiquan; Yamafuji, Kazuo (1995). "Realization of a human riding a unicycle by a robot".Proceedings of 1995 IEEE International Conference on Robotics and Automation. Vol. 2. pp. 1319–1326.doi:10.1109/ROBOT.1995.526027.ISBN978-0-7803-1965-3.S2CID7280130.
