The Segway PT (originally Segway HT) is a two-wheeled, self-balancing personal transporter by Segway Inc. It was invented by Dean Kamen and brought to market in 2001. HT is an initialism for "human transporter" and PT for "personal transporter".
Segway x2 and i2
|Models made||i2 SE, x SE, miniPro, robot|
The Segway PT (referred to at the time as the Segway HT) was developed from the self-balancing iBOT wheelchair which was initially developed at University of Plymouth, in conjunction with BAE Systems and Sumitomo Precision Products. Segway's first patent was filed in 1994 and granted in 1997 followed by others including one submitted in June 1999 and granted in October 2001.
The invention, development, and financing of the Segway was the subject of a book, and a leak of information prior to publication of the book and the launch of the product led to excited speculation about the device and its importance. John Doerr speculated that it would be more important than the Internet. South Park devoted an episode to making fun of the hype before the product was released. Steve Jobs was quoted as saying that it was "as big a deal as the PC", (but later retracted that saying that it "sucked", presumably referring to "the design" but commenting about the boutique price, asking, "You're sure your market is upscale consumers for transportation?") The device was unveiled on 3 December 2001, following months of public speculation, in Bryant Park, New York City, on the ABC News morning program Good Morning America with the first units delivered to customers in early 2002.
The original Segway models featured three speed settings: 6 miles per hour (9.7 km/h), 8 mph (13 km/h) with faster turning, and 10 mph (16 km/h). Steering of early versions was controlled using a twist grip that varied the speeds of the two motors. The range of the p-Series was 6–10 mi (9.7–16.1 km) on a fully charged nickel metal hydride (NiMH) battery with a recharge time of 4–6 hours. In September 2003, the Segway PT was recalled, because if users ignored repeated low battery warnings on the PTs, it could ultimately lead them to fall. With a software patch to version 12.0, the PT would automatically slow down and stop in response to detecting low battery power.
In August 2006 Segway discontinued all previous models and introduced the i2 and x2 products which were steered by leaning the handlebars to the right or left, had a maximum speed of 12.5 mph (20.1 km/h) from a pair of 2 horsepower (1.5 kW) Brushless DC electric motors with regenerative braking and a range of up to 15–25 mi (24–40 km), depending on terrain, riding style and state of the batteries. Recharging took 8–10 hours. The i2 and x2 also introduced the wireless InfoKey which could show mileage and a trip odometer, and put the Segway into Security mode, which locked the wheels and set off an alarm if it was moved, and could also be used to turn on the PT from up to 15 feet (4.6 m) away.
Versions of the product prior to 2011 included (in order of release):
- Segway i167 (2001 reveal, 2002 shipped)
- Segway e167:[when?] As i167, with addition of electric kickstand
- Segway p133: Smaller platform and wheels and less powerful motors than the i and e Series with top speed was 10 miles per hour (16 km/h) in the p-Series
- Segway i180: With lithium-ion batteries
- Segway XT: The first Segway designed specifically for recreation
- Segway i2 (2006): The first on-road Segway PT with LeanSteer
- Segway x2 (2006): The first off-road Segway PT with LeanSteer
In March 2014, Segway announced third generation designs, including the i2 SE and x2 SE sport, new LeanSteer frame and powerbase designs, with integrated lighting.
Subsidiary of NinebotEdit
- Segway i2 SE (professional self-balancing scooter for use in warehouses and other locations)
- Segway x2 SE (ruggedised self-balancing scooter for use on most challenging terrain)
- Segway Robot (autonomous robot based on the Segway miniPro)
The dynamics of the Segway PT are similar to a classic control problem, the inverted pendulum. It uses brushless DC electric motors in each wheel powered by lithium-ion batteries with balance achieved using tilt sensors, and gyroscopic sensors developed by BAE Systems' Advanced Technology Centre. The wheels are driven forward or backward as needed to return its pitch to upright.
In 2011 the Segway i2 was being marketed to the emergency medical services community. The special police forces trained to protect the public during the 2008 Summer Olympics used the Segway for mobility. In 2018, the police of Stockholm adopted segways as permanent transportation method for the patrollers of the old town.
The Segway miniPro is also available to be used as the mobility section of a robot.
Disability Rights Advocates for Technology promoted the use of the Segway PT on sidewalks as an Americans with Disabilities Act of 1990 (ADA) issue. Segway Inc. cannot however market these devices in the US as medical devices (as per agreement with Johnson & Johnson with regard to the iBOT, a self-balancing wheelchair).
The maximum speed of the Segway PT is 12.5 miles per hour (20.1 km/h). The product is capable of covering 24 mi (39 km) on a fully charged lithium-ion battery, depending on terrain, riding style, and the condition of the batteries. The U.S. Consumer Product Safety Commission does not have Segway-specific recommendations but does say that bicycle helmets are adequate for "low-speed, motor-assisted" scooters.
- Kemper, Steve (2003). Code name Ginger : the story behind segway and Dean Kamen's quest to invent a new world. Boston, Mass.: Harvard Business School Press. p. 27. ISBN 9781578516735. Retrieved 23 June 2016.
- US patent 5,701,965 Human transporter
- "Segway Patent Information" (PDF). Segway Inc.
- US Patent 6,302,230 Personal mobility vehicles and methods
- Kemper, Steve (2003). Reinventing the Wheel: A Story of Genius, Innovation, and Grand Ambition. ISBN 1578516730.
- "Reinventing the Wheel". Time. 2 December 2001. Retrieved 11 March 2009.
- Kemper, Steve (16 June 2003). "Steve Jobs and Jeff Bezos meet "Ginger"". Harvard Business School Working Knowledge.
- "January 26, 2000". The Daily Show. 26 July 2000. Archived from the original on 2 July 2015.
- Machrone, Bill (3 December 2001). "Ginger Unveiled-It's a Scooter!". Extremetech.com. Retrieved 11 March 2009.
- Tweney, Dylan. "Wired.com retrospective". Retrieved 12 April 2009.
- "About Segway – Who We Are – Segway Milestones". Segway. Archived from the original on 18 March 2009. Retrieved 11 March 2009.
- "Segway, Official Site". Segway.com. 28 April 2011. Archived from the original on 27 October 2011. Retrieved 6 November 2011.
- "Segway LLC Recall to Upgrade Software on Segway Human Transporters". Cpsc.gov. 26 September 2003. Archived from the original on 22 September 2008. Retrieved 11 March 2009.
- "Segway i2". Segway.com. Archived from the original on 7 January 2009. Retrieved 11 March 2009.
- "Enhanced range, courtesy of lithium-ion". Archived from the original on 17 October 2006. Retrieved 29 November 2010.
- "Segway PT Previous Model". Segway Inc. Archived from the original on 9 July 2011. Retrieved 23 July 2011.
- The versatile Segway PT i180 Archived 12 August 2007 at the Wayback Machine
- "Segway Launches New SE Personal Transporters (PTs) And SegSolution Accessory Packages". reuters.com. Retrieved 22 March 2014.[dead link]
- Catherine Shu (15 April 2015). "Beijing-based Ninebot Acquires Segway, Raises $80M From Xiaomi And Sequoia". TechCrunch.
- "Why This Chinese Startup Just Bought a Company Americans Love to Ridicule". Time. 15 April 2015.
- "Segway launches $1,000 self-balancing scooter you can control like a drone from your phone". Venture Beat. 1 June 2016.
- "Segway I2 SE". Segway Inc. Retrieved 13 July 2017.
- "Segway x2 SE". Segway Inc. Retrieved 13 July 2017.
- "Meet Loomo". Segway Robotics. Retrieved 13 July 2017.
- "Ninebot by Segway E+". Segway Inc. Retrieved 13 July 2017.
- "Segway miniPro". Segway Inc. Retrieved 13 July 2017.
- "Segway - About Us - Press Releases - BAE SYSTEMS and Segway LLC Announce Partnership to Market Segway Human Transporter in the UK - 22 Jul 2002". segway-madrid.com.
- "EMS LifeLine". StreetSmart Segway. Archived from the original on 14 November 2011. Retrieved 6 November 2011.
- "Wheel scary: Chinese anti-terror police practise killing drills on scooters | Mail Online". Mailonsunday.co.uk. 2 July 2008. Retrieved 11 March 2009.
- "IN PICTURES: Stockholm's segway police are here to stay". www.thelocal.se. 8 May 2018. Retrieved 26 August 2019.
- "Robot Segway Rovers Train Special Forces For Urban Warfare". Inventorspot.com. 12 April 2010. Retrieved 18 April 2010.
- "Disability Rights Advocates for Technology". Archived from the original on 27 August 2008. Retrieved 6 August 2008.
- Higginbotham, Adam (27 October 2008). "Dean Kamen: part man, part machine". The Daily Telegraph. London. Archived from the original on 14 August 2009. Retrieved 26 September 2009.
- "i2 SE Personal Transporter". Archived from the original on 27 May 2016. Retrieved 24 May 2016.
- "CPSC Guide:Which Helmet for Which Activity" (PDF). Archived from the original (PDF) on 20 September 2008. Retrieved 5 August 2008.