The motor is a key part of an electric bicycle. As the electric bicycle with limited energy, as all-weather transport, but also requires the motor to withstand the harsh environment, high reliability.

Motor in the structure, divided into brush motor and brushless motor;

Brush motor is a traditional product, the performance is relatively stable. Should be the preferred motor for electric vehicles.
Brushless motor is a new product, its life performance is better than brush motor. But its control circuit is more complex, the elements of the aging screening requirements more stringent. Although the motor life is long but the control circuit is prone to problems.
So the choice of brushless motor to go through a rigorous reliability test to ensure quality.

Motor output transmission mode, can be divided into wheel, in the home, friction type;
Wheel type structure is simple, good shape, but the motor shaft force, the motor requirements are high. Electric bicycles can choose this kind of motor.
In the home structure is more complex, but the motor shaft force is small, the motor damage is small, electric bicycles also choose this kind of motor.
Friction type structure is relatively simple but the damage to the wheel tires larger, and the rain skid. (Electric bike should carefully choose this kind of motor).
Motor running speed, can be divided into low-speed large-scale direct drive from the motor and high-speed motor slowdown;

The former because of eliminating the gear box, so the noise is small, simple structure, high reliability. But compared with the latter, the weight is heavy. Wheel type should be used to drive low-speed, and the central type is generally high-speed motor deceleration type. Although the motor more types, but in its mainstream, the current market can see the electric bike, from the motor's working principle is divided into: rare earth permanent magnet brushless motor, rare earth permanent magnet brushless toothless DC motor , Rare earth permanent magnet brush with tooth DC motor.

In the actual production process, because the brush has a tooth DC motor is a high-speed motor, gear teeth are small, easy to wear, but the strength, climbing ability. The brushless DC motor, in the course of the use of eliminating the two or three years for the carbon brush trouble. But because of the process of controlling the brushless motor, requiring high precision. Moreover, brushless motor controller prices are higher. In contrast to brushless toothless DC motor, although to replace the carbon brush, but the replacement of carbon brush is very easy, and the motor control is relatively simple, the motor running smoothly, high safety factor.