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.
OHM bicycles use E-One Moli Energy (Canada) Ltd’s Lithium-ion battery packs to deliver the safest and highest power of any mid-large e-bike battery currently available on the market. With advanced protection, performance, and convenience, Li-ion batteries are fast charging and maintain steady power output throughout their lifespan. The e-bike battery packs are specifically configured to work with the BionX motor for optimum range and performance.
With over a decade of experience as an advertising executive, Mark is certain that the market will accept the electric bike and is here to make sure it happens. Mark has an impressive list of former clients in industries like pharmaceuticals, convenience stores, community banks, floor coverings, visitors’ bureaus, resorts and Location Based Services (LBS). When he’s not on Facebook, tweeting or learning how to leverage the latest viral marketing techniques,...
Comfort. Like any other type of bike the electric bike should offer you a comfortable ride. All general components such as, saddle, handlebars, the geometry of the frame should put you in a comfortable position. If the bike doesn’t satisfy these criteria it’s certainly not the best electric bike on the market. After all you’re going to spend quite a lot of time riding it, so you might as well look for a more comfortable solution.
On the other end of the pricing spectrum (although not as high-end as possible) falls the Riese & Muller lines. The Nevo line, which features a Bosch motor, hydraulic disc brakes and speeds up to 28 mph also has a roughly $5,000 sticker (a variety of models allows for a cheaper price). Using a carbon belt and Nuvinci grip shifter, maintenance worries lessen. The German-made premium models are hand made to specifications and comfort reigns supreme.
This article first appeared in Electric Bike Report in June of 2013. Since then, we’ve made some changes to our motor selection - our Direct-Drive motors are now all High-Torque 6x9 wound, so they run slower (approximately 15mph at 36v or 20mph at 48v), and our Geared Motors have been replaced by a 500w version, (approximately 20mph at 36v or 28mph at 48v). The Direct-Drive is now our Heavy-Duty motor and the...
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.