Purchase Notes electric bicycles

Electric bicycles, refers to the battery as an auxiliary energy, with two wheels, to achieve human riding, electric or electric assist tricycles special features. Electric bicycle battery only as a secondary energy source; must have two wheels; the design speed of not more than 20 km / h; vehicle weight of not more than 40 kg; tire width (the womb) is not greater than 54 mm. It is based on a conventional bicycle, electric bicycle mounted motors, controllers, batteries, turn the brake components to manipulate and display and electrical instrumentation systems integration of personal transport.
Buy electric bicycles is to pay attention to selecting a high profile brand, quality and service are guaranteed. Different models, its safety and performance varied. Proposal to buy simple, lightweight. Note smooth surface gloss, pay attention to welding, painting, plating quality.
Trial ride and feel the start of the vehicle, acceleration, driving is stable, is comfortable to handle the vehicle, check the tightness of the brakes, handlebars flexibility, mobility wheels. Check procedures. Check production license, manual, certificate is valid, complete, check the vehicle with accessories are complete. Special attention is on the cards for the local approved models. Relevant and important parts, such as batteries, motors, chargers, controllers, tires, turn the brakes and whether the brand product. The best option brushless motor.

Development of China's electric bicycle technology

China electric bike on the application of the torque sensor technology and integrated circuit controller technology has been a world leader, the integrated electronics and digital technology in the controller, the motor valve-regulated charge control other components, intelligent electric bicycles will be the future the commanding heights of development.
The high-tech composite materials and high-strength light alloy material will be more used in electric bicycles manufacturing. While the successful application of aluminum alloy material, the use of titanium, chromium molybdenum steel and other lightweight, high strength carbon fiber and other materials and polymer composites. Increase the intensity of electric power trikes, electric bicycles to reduce the weight. The bicycle's performance and manufacturing process revolutionary change.
Wider application of computer and microelectronics technology in electric bicycle product design, mold processing and production process, continue to improve production automation and improvement of production technology. Accelerate international new technology, new materials, the use of tires, batteries and accessories manufacturing nano materials, so foldable bike electric are lighter, faster and travel farther.
China's nickel-metal hydride battery technology has gradually matured applications, lithium battery safety issues once solved, it can be spread. Technology leading electric bicycle manufacturing enterprises to increase research on new energy, reduce the cost of the new battery to the electric bike more "source of life."

Electric bicycles classification

Electric bicycles can be divided into all-electric and intelligent assisted two categories. Full electric bike: You can ride pedal may be without the aid of labor, but on pure electric drive, use the handle to control the speed, to achieve 0-20 km / h continuously variable transmission. Intelligent assisted electric bike: a conventional bicycle with a similar mode of operation, can human riding, you can also power assistance, no electric function. In its human-based, electricity, supplemented by the size of human riding force, control the size of the current supply, to achieve a combination of human and electric power, riding feel relaxed. adult electric tricycles when it reaches design speed, stop the supply of electricity.
Electric bicycle by a vehicle body, an electric drive unit (motor), rechargeable battery, charger and control system has five major components. Different types of car, its battery placement location, controllers and other different forms.
Friction transmission type: loaded directly from the wheel by the motor shaft in car tires on the drive by friction. Its advantages are simple structure, low cost, but tire wear and easy to slip during the rainy season. Driven axis: the axis of the frame is specially designed motor mounted to drive axis via a reduction mechanism, again driven by the rear wheel through the chain axis. The advantage is reasonable motor center of gravity, and can take advantage of the bicycle shift reduction system, but the mechanical loss is large.
Batteries for electric bicycle 3 wheel are mainly three types, namely small sealed lead-acid battery maintenance, nickel cadmium batteries and nickel-metal hydride batteries. Low small sealed lead-acid batteries cost, large capacity, has been widely used domestic enterprises. Chargers design with constant current, constant voltage, floating three-stage automatic conversion mode, the battery protective, effectively extending the battery life.

Prevent electric bicycle motor magnets off method

Since the motor working environment is very bad, in rainy weather and humidity greater riding inevitably there will be rain water or moisture into the stator core scaffold is a ferrous material, easy to rust, rust generated in the stator magnet and iron expansion between the core support, expanding the magnet, resin adhesive will lose its proper role, relying on magnetically adsorbed on the stator core magnet stand, then there is the magnetic force of the impact of bumps and rotor effects, magnet It will shift, ranging from motor performance decline, while motor sweep chamber, the motor must be repaired.
Using screws. Drill two holes in the magnet, three wheel electric tricycle and drill two holes and tapped at the corresponding position of the stator core bracket, screws with countersunk head fixed on each piece of magnet stator core bracket, so it does not appear magnet shedding problem, since the magnet more than two holes affect the magnetic flux density of the stator, the stator magnetic field not the original strong.
With dovetail fixed. Stator core scaffold is cast from a mold, change in the production process as long as the mold, leaving dovetail groove in the stator core bracket, and then after mechanical processing, so the size of dovetail meet the design requirements and the complete stator concentrically. Then the magnet production costs dovetail, as long as the magnet assembly when axially into the slot, to solve the issue through fixed magnet mechanical tight fit.
This method simply by improving the mold, it is easy to cast magnet assembly, eliminating the hassle resin adhesive with a magnet, will not increase the cost of production, the magnet will never come off or loose. Because the bumps and the electromagnetic force of the magnet is radial and tangential directions are two dovetail fixed, movable axially in magnet no external force, unless human force. When the magnet for magnetic weaken need to be replaced, as long as the axial afterburner magnets can be easily removed, can be easily magnetized to the magnet or replacement.

Electric car which tips

Electric car design standard load of 75kg, when the load exceeds 90kg, the battery and the motor will be damaged. Battery not long hold, hold charge at least once a month. After riding the battery discharge must be fully charged storage, otherwise it will greatly affect battery life, severe cases can cause the battery scrap.
When the power runs out, the system will automatically power off. But after the power is turned off, the electric mountain bicycles battery appears bounce "virtual" voltage (reactive power and voltage), then it must be charged before using it, otherwise it will cause the battery discharge, which would damage the battery can not be repaired . Actual mileage continued line of electric bicycles will be affected by many factors (such as frequent braking, starting, uneven pavement, the temperature is too low, on the steep slopes, wind speed, tires inflated, excessive load) effects.
When riding slow acceleration. From 0-20km / h, acceleration time is not less than 10S, in order to maintain a smooth ride. Minimize the number of starts. Electric vehicle economic speed (most power can travel speed) is generally 16-18km / h. Note that the braking distance riding is generally 4m, rain increases the braking distance doubled.

Application of electric bicycles in chip technology

Electric bike is a green vehicle with a power-driven, pedal-driven, power and other effects of the foot and use. Battery through a controller to a motor power transmission, the motor on the wheel, the motor bicycle driven rotary travel.
folding electric trikes controller connects a governor handle the shaft with the pedal assist sensor, electric bicycle handle rotation speed allows the controller to detect the different voltage value, the controller according to the voltage value of the size, analog adjustment applied to the motor voltage level, so as to control the motor speed.
The controller brushless motor control method is based on the position of the motor feedback signals to control the three-phase motor drive upper and lower arms MOS tube on and off, enabling electronic commutation. three wheel electric tricycle use SPMC65P2404A as a master MCU.