Photo: Zap Electric’s power-assist kit turns a conventional bike into an electric one. There’s a bolt-on DC electric motor (weighing just over 3kg or 7lb) just above the back wheel, behind the police officer’s foot, pressing against the tire and driving it by simple friction. The motor’s powered by a compact lead-acid battery (weighing about 5.5 kg or 12 lb) inside a protective nylon bag. This kit adds quite bit of weight to the bike, but gives extra range and speed when needed. Photo taken in Santa Rosa, California courtesy of US DOE/NREL.
China is the world’s leading manufacturer of e-bikes, with 22.2 million units produced in 2009. One of the biggest manufacturers of E-bikes in the world is Geoby. Production is concentrated in five regions, Tianjin, Zhejiang, Jiangsu, Shandong, and Shanghai. China exported 370,000 e-bikes in 2009.
Our take on the classic Dutch city bike, the Amsterdam® is the embodiment of sophisticated elegance while providing a practical, comfortable, stylish ride for running errands or just rolling around town.
The time or distance an electric bike battery will run between chargings is impossible to judge with much accuracy. There are too many variables: terrain, speed, rider weight, bike load (shopping, kids, luggage), and more. However, we can make a few generalizations about an e-bike’s recharge time and overall working life. These generalizations should be used for comparison purposes only.
Lithium battery: 36V. Motor: 250W high speed brushless gear motors. Type: Mountain Bicycle. Front Fork: High-strength carbon steel comfort shock absorption. Tire: High quality lithium tire. Charger: Smart Lithium battery charger.
For the premium buyer, there’s the Faraday Porteur, the brainchild of Adam Vollmer, a mechanical engineer from Ideo, the famed design firm. First launched as a Kickstarter project last year, Faraday is now taking pre-orders for Porteur, which is priced at $3,500. It weighs less than 40 pounds, features a leather saddle and bamboo fenders, and its Web site promises that it is “crazy fun.” Even more expensive is the $4,000 eFlowE3 Nitro from Currie, which was designed by a Swiss firm, Flow AG, and promises “fast, powerful and nimble handling.” And if you’ve really got money to burn, there’s a German e-bicycle called the Blacktrail BT-1 that claims a top speed of 65 mph and retails for $80,000. Think of it as the Tesla of electric bikes.
As a power electronics engineer I had intended designing and developing a torque assist bike so was surprised to find that a few manufacturers brought them out in Europe recently. I bought a Raleigh Vélo Cité with a 36V 10Ahr lithium battery. I would never use a throttle or cadence type unless I was infirm and I am sure that torque sensing pedelecs will become the norm as prices fall.
The Japanese giant, which manufactures everything from motorcycles and musical instruments to personal water scooters and motorboats, will begin selling Yamaha Power Assist Bicycles through U.S. dealers in 2018.
An Electric Boost for Bicyclists by J. David Goodman. The New York Times, January 31, 2010. There are over 120 million electric bicycles in China, and now Chinese makers have got behind the technology, they are driving growth in other world markets.
Finally we are getting somewhere. I have a bicycle, check. It has an electric motor, check. I weighed it, and it was 80 pounds, check. When I rode it, it went 23-MPH. Whoops! “Cannot attain a speed of more than 20-MPH”
so by simply gearing down ones electric bike and then spinning fairly fast also as well with half the pressure on ones pedals for example; the corresponding electric motor assist will also be reduced to ones electric bike; this will help to improve, preserve and optimize the electric bike batteries range in miles.