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The electric assist system is the soul of an E-BIKE. It determines the riding experience of an E-BIKE, whether it's aggressive and swift or smooth and gentle. For traditional sports bicycles, you can get an initial understanding of the vehicle's performance and experience through its material, geometry, and configuration. However, for the electric assist system, appearance and performance are not directly related. To understand the temperament of an E-BIKE, you must experience it yourself. The mid motor system is such a mysterious and technologically advanced existence.
In electric assist bicycles, the mid motor is a design where the motor is installed in the middle of the frame, near the bottom bracket. The core advantage of the mid motor lies in its structural design, which optimizes power transmission and bicycle balance. To understand this, we need to know some basic motor structure concepts, including "outer rotor motor" and "inner rotor motor".
The difference between outer rotor motors and inner rotor motors lies in the position of the rotor and stator. In outer rotor motors, the stator is fixed on the inner circle, and the rotor rotates on the outer circle. This design provides excellent heat dissipation and load capacity. In inner rotor motors, the stator is on the outer circle, and the rotor is on the inner circle, suitable for small devices requiring high speed. Mid motors usually adopt the outer rotor motor design, enabling the motor to better cope with the high load demand of E-BIKE rides.
Coaxial motors and parallel shaft motors are the two main types of mid motors. The design of mid motors not only concerns the internal structure of the motor but also involves the positional relationship between the motor output shaft and the bottom bracket axle. These designs determine the performance of mid motors during riding.
The characteristic of coaxial motors is that the motor's output shaft and the bottom bracket axle are on the same axis. This design makes the motor structure more compact, the appearance more petite, and the internal space efficiently utilized. Mid motors often use an outer rotor design to place the reduction mechanism between the motor stator and rotor, enabling the mid motor to achieve powerful output within a small volume.
Parallel shaft motors, on the other hand, have the motor output shaft at the rear and the bottom bracket axle at the front. This design requires a longer cavity space, making it larger and near rectangular in shape. Parallel shaft motors often use inner rotor motors, suitable for high-speed applications.
The design of mid motors not only affects the motor's performance but also directly influences the overall riding experience. Achieving a balance between enhancing pedal cadence and reducing motor output to increase torque within a limited space, while ensuring motor heat dissipation and concentricity of the drive shaft, is not easy. Through its efficient design, mid motors balance these needs, providing a stable and robust riding experience.
For modern E-BIKEs, choosing a mid motor means choosing a solution that provides stable output and efficient power. The optimized design of mid motors makes them excellent performers under various riding conditions. Whether for daily commuting or mountain biking, mid motors ensure excellent power transfer and comfort.
Overall, the mid motor, as the core power component of electric assist bicycles, with its unique structure and design advantages, has become the first choice for many high-end E-BIKEs. Understanding the working principle and design characteristics of mid motors will help you better choose a suitable electric assist system, enhancing the joy and efficiency of your rides.
sales@syimotor.com
+86-512-65975022
+86-512-65963935
No.588, Liupu Road, Wuzhong District, Suzhou/215124, JiangSu Province, China
