Patriot DreamE has motor cut-off brake levers and lighted battery indicator on the throttle. Some electric bikes have small tires which perform best on smooth streets. The DreamE has full size, 26" wheels for a safe and comfortable ride. Patriot customers have a choice of color, frame size (standard or small), seat style (contour or velo), motor power (350 / 500 / 750 watts), and battery chemistry (LFP).
Added help on the hills: An extra boost on the hills or when cycling into a headwind is probably the first thing most people think about when they’re considering an electric bike. If you live in a valley where the only way out is up, then having a bit of motor assistance may mean the difference between a happy cycling experience and not cycling at all.
China has experienced an explosive growth of sales of non-assisted e-bikes including scooter type, with annual sales jumping from 56,000 units in 1998 to over 21 million in 2008, and reaching an estimated fleet of 120 million e-bikes in early 2010. This boom was triggered by Chinese local governments' efforts to restrict motorcycles in city centers to avoid traffic disruption and accidents. By late 2009 motorcycles are banned or restricted in over ninety major Chinese cities. Users began replacing traditional bicycles and motorcycles and e-bike became an alternative to commuting by car. Nevertheless, road safety concerns continue as around 2,500 e-bike related deaths were registered in 2007. By late 2009 ten cities had also banned or imposed restrictions on e-bikes on the same grounds as motorcycles. Among these cities were Guangzhou, Shenzhen, Changsha, Foshan, Changzhou, and Dongguang.
E-bikes use rechargeable batteries, electric motors and some form of control. Battery systems in use include sealed lead-acid (SLA), nickel-cadmium (NiCad), nickel-metal hydride (NiMH) or lithium-ion polymer (Li-ion). Batteries vary according to the voltage, total charge capacity (amp hours), weight, the number of charging cycles before performance degrades, and ability to handle over-voltage charging conditions. The energy costs of operating e-bikes are small, but there can be considerable battery replacement costs. The lifespan of a battery pack varies depending on the type of usage. Shallow discharge/recharge cycles will help extend the overall battery life.
Rachel L. Davis is an avid bicyclist. But as a working mother of two, with a third child on the way, she doesn’t have time for long bike rides. “In my world, getting my exercise has to be part of my daily life,” says Davis, 36, who owns a marketing strategy company based in Washington. “I live in a hilly part of D.C., and as I’ve become more pregnant, more tired with more children, I don’t have as much energy to be biking 40 miles or biking to Alexandria.”
Fly Rides is back with the top 10 electric for commuting in 2018! Why top ten instead of eight? Because there are too many good choices this year! Electric commuting bikes are primed for more popularity this year than ever. With major cities across the country improving their biking infrastructure (finally), and electric bikes now having the capability to take you 60 miles and further, commuting by ebike grows all the time. Let us help you figure out the best option for your commute with our blog on the top 10 electric bikes for commuting in 2018! Read on for our full list.
Controllers for brushless motors: E-bikes require high initial torque and therefore models that use brushless motors typically have Hall sensor commutation for speed and angle measurement. An electronic controller provides assistance as a function of the sensor inputs, the vehicle speed and the required force. The controllers generally allow input by means of potentiometer or Hall Effect twist grip (or thumb-operated lever throttle), closed-loop speed control for precise speed regulation, protection logic for over-voltage, over-current and thermal protection. Bikes with a pedal assist function typically have a disc on the crank shaft featuring a ring of magnets coupled with a Hall sensor giving rise to a series of pulses, the frequency of which is proportional to pedaling speed. The controller uses pulse width modulation to regulate the power to the motor. Sometimes support is provided for regenerative braking but infrequent braking and the low mass of bicycles limits recovered energy. An implementation is described in an application note for a 200 W, 24 V Brushless DC (BLDC) motor.
Motor: We have a blog post showing some motor differences: https://www.ebikekit.com/blogs/news/its-whats-inside-your-motor-that-counts Cabling is probably the #1 issue when something goes wrong. Good connectors, good cables, and good assembly (bike shop!) are crucial Strain reliefs on all cable joints! Where you have a junction box or a connector, the stress is concentrated over a small area near this stiff spot on the cable. This can cause small breaks on the internal...
For many bikes, battery range is more important that total power (because they're all pretty powerful). You want a bike that delivers a range long enough for your rides at the power levels you want. Most e-bikes will have three to five levels of assist kicking in anywhere from 25 percent of you pedal power to 200 percent boost. Consider how fast the battery takes to recharge, especially if you'll be using your bike for long commutes.