Types and structures of electric bicycles and daily maintenance knowledge?

⑴ Full electric bicycle: It can be ridden on foot or without the help of manpower. It is driven by pure electric power and uses the handle to control the speed to achieve 0-20 km/h infinitely variable speed.
⑵Intelligent assisted electric bicycle: It has a similar operation mode to ordinary bicycles. It can be ridden by humans or powered by electricity. It has no pure electric function. It is based on manpower, supplemented by electricity. The size of the human riding force controls the size of the current supply to achieve the combination of manpower and electricity, and the riding feels relaxed. When the design speed is reached, the power supply stops. To
An electric bicycle is composed of five parts: a vehicle body, an electric drive device (motor), a rechargeable battery, a charger, and a control system. Different types of vehicles have different battery placement positions and controller forms.
①Friction transmission type: the *wheel on the motor shaft is directly loaded on the tires of the car, * friction transmission. Its advantages are simple structure and low cost, but the tires are worn out and easy to slip in the rainy season.
② Bottom-shaft drive type: A motor is specially designed at the middle axle of the frame to drive the middle axle through a reduction mechanism, and then the middle axle drives the rear wheels through a chain. The advantage is that the motor's center of gravity is reasonable and the bicycle deceleration system can be used to shift gears, but the mechanical loss is relatively large.
③Electric hub type: The motor is installed in the hub of the wheel, which can be installed on the front or rear wheels. The hub is connected to the rim by spokes and directly drives the wheel to rotate. Its advantages are small size, light weight, low energy consumption, and relatively high efficiency, but it is difficult for the motor to dissipate heat and to lubricate the transmission gear. At present, most domestic electric bicycles use this method.
Motors are divided into two types: brushless motors and brushed motors. The brushless motor is mainly a low-speed and high-torque motor. There is no transmission gear, which avoids mechanical wear. There is almost no noise in operation. However, the starting current impact of the brushless motor is relatively large, and the control system structure is complex. The hub brush motor adopts advanced technology to improve Brush life, high motor efficiency, simple control system electronic circuit.
⑶ Rechargeable batteries: There are three main types of batteries used in electric bicycles, namely small sealed maintenance lead-acid batteries, nickel-cadmium batteries and nickel-hydrogen batteries. Small, sealed, maintenance-free lead-acid batteries have low cost and large capacity, and are widely used by domestic companies.
⑷Charger: The charger design adopts the three-stage automatic conversion method of constant current, constant voltage and floating charge to protect the battery and effectively extend the battery life.
⑸Control system: The control system is designed with multiple protection functions, such as power display, stepless speed regulation, soft start, undervoltage protection, overcurrent protection and brake power failure. Protect the motor and battery, so that the current can be effectively output, and the required power can be generated without burning the motor. At present, most of the electric bicycles developed in China use manual speed control handles to determine the power supply mode by themselves.