Friends who have ridden an electric bicycle know that the ebike hub motor kit is actually a motor. Unlike a motorcycle, the whole drive system is independent. So the question is, why can't the mid motor become the mainstream drive system of two wheel electric vehicles?
The structure of ebike hub motor kit is relatively simple, which is usually composed of metal shell, shaft, coil and magnetic steel. The production cost is between 150-300 RMB. In addition to the motor itself, there are clutch, differential (speed change device), flywheel, transmission chain and other structures. A set of high-quality mid motor costs at least 1000 RMB, while the retail price of mainstream electric vehicles is only about 3000 RMB.
As the ebike hub motor kit omits the transmission structure, its power conversion efficiency and driving performance under low speed (60km / h) is better than that of the center motor. With the same battery and power, the ebike hub motor kit can run further.
Due to the complex structure of the central motor, it is prone to mechanical failure and needs regular maintenance. And the ebike hub motor kit does not need to, just need to do a good job of motor sealing, it is very durable at low speed.
Why do some electric vehicles still use a central motor?
The core reason is "heat dissipation". When the motor rotates at high speed, it will release a lot of heat. The wheel motor is wrapped with a tire, and the tire will burst when it is heated and expanded. The central motor is not the same, because it is an independent power structure, generally placed in the car chassis or side hanging in the rear, the ventilation conditions and heat dissipation are better than the ebike hub motor kit. Therefore, the central motor is more suitable for high-speed driving!
But with the development of liquid cooling technology, the motor is filled with coolant. The heat dissipation of ebike hub motor kit is greatly improved, and the structure of relying on air heat dissipation is changed. Even when the motor rotates at high speed, the temperature can be kept within the normal range, which greatly expands the application scenarios of ebike hub motor kit.
In the future, ebike hub motor kit is still the mainstream. And the middle motor is favored by many players because of its good heat dissipation, good balance and good handling!