Principle and structure analysis of hub motor
Wheel hub motor technology, also known as wheel-mounted motor technology, is characterized by the integration of power, transmission and braking devices into the hub, thus greatly simplifying the mechanical part of the electric vehicle. Wheel hub motor technology is not new. As early as 1900, electric vehicles with front wheel wheel motors were manufactured. In the 1970s, this technology was applied in mine transport vehicles and other fields. For the hub motors used in passenger cars, Japanese manufacturers have carried out earlier research and development of this technology, and are currently in a leading position. International auto giants including General Motors and Toyota have also been involved in this technology.
Hub motor structure
The hub motor drive system is mainly divided into two types according to the rotor type of the motor: an inner rotor type and an outer rotor type. The outer rotor type uses a low-speed external sub-motor. The maximum speed of the motor is 1000-1500r/min. There is no deceleration device. The rotation speed of the wheel is the same as that of the motor. The inner rotor type uses a high-speed inner rotor motor and a fixed gear ratio reducer. In order to achieve higher power density, the motor speed can be as high as 10000r/min. With the advent of more compact planetary gear reducers, the inner rotor hub motor is more competitive in terms of power density than the low speed outer rotor.
How the hub motor works
The working principle of electric car hub motor is: electronic commutator (switch circuit)
According to the position sensor signal, the stator winding is energized in sequence and time to generate a rotating magnetic field to drive the rotor to rotate.
The electric vehicle hub motor assembly and control system are automotive parts and are the key components of electric vehicle parts.
The system features: a unique design of the motor system, brake system, suspension system, permanent magnet brushless synchronous electric vehicle hub motor and switched reluctance hub motor, PWM control and AC frequency conversion control can be used, this perfect The product design has the characteristics of high efficiency, light weight, long life, low noise, strong matching, simple structure, easy assembly, complete functions, independent suspension, safe and reliable. It is directly suspended without mechanical components such as axles and gearboxes. The tire is mounted on the body, the transmission consumption is equal to zero, and the rotation efficiency is 100%.
It has a qualitative change with the traditional motor drive shaft-gearbox-differential-axle and other electric vehicle mechanical transmission systems, so the overall structure, drive performance, overall efficiency, and driving range are superior to any form of drive structure, configurable Two-wheel drive and four-wheel drive are the first choice for electric vehicle drive system, and can be matched with any type of car to form an electric oil hybrid car. The wheel motor drive is the future development direction of electric vehicle drive.
