Brief Introduction Of Hub Motor Technology
Hub motor technology is also called in-wheel motor technology. Its biggest feature is the integration of power, transmission and braking devices into the wheel hub, so the mechanical part of the electric vehicle is greatly simplified. In-wheel motor technology is not new. As early as 1900, an electric vehicle equipped with in-wheel motors on the front wheels was manufactured. In the 1970s, this technology was applied in mining transportation vehicles and other fields.
The hub motor drive system is mainly divided into two structural types according to the rotor type of the motor: inner rotor type and outer rotor type. Among them, the outer rotor type uses a low-speed outer rotor motor, the maximum speed of the motor is 1000-1500r / min, no speed reduction device, the wheel speed is the same as the motor; and the inner rotor type uses a high-speed inner rotor motor, equipped with a fixed gear ratio reducer In order to obtain higher power density, the motor speed can be as high as 10000r / min. With the advent of more compact planetary gear reducers, inner rotor hub motors are more competitive than low speed outer rotor hubs in terms of power density.