It omits a large number of transmission components, making the vehicle structure simpler. For traditional vehicles, the clutch, gearbox, drive shaft, differential, and even the transfer case are all essential components. These components not only add weight and complexity to the vehicle structure, but also have regular maintenance and failure rate problems. However, the wheel hub motor solves this problem very well. In addition to the simpler structure, vehicles driven by wheel hub motors can achieve better spatial utilization and the transmission efficiency is also much higher.
It can achieve multiple complex driving modes. Due to the characteristic of independent driving of a single wheel, the electric wheel hub motor can easily achieve front-wheel drive, rear-wheel drive or four-wheel drive forms. Full-time four-wheel drive can be easily realized in vehicles driven by wheel hub motors. At the same time, the wheel hub motor can achieve differential steering similar to tracked vehicles through different speeds or even reverse of the left and right wheels, greatly reducing the turning radius of the vehicle. In special cases, it can almost achieve turning on the spot (although this causes greater wear and tear on the vehicle's steering mechanism and tires), which is of great value to special vehicles.
Let's start with the application and working principle of the wheel hub motor. Simply put, the wheel hub motor is a motor that integrates the wheel hub and the drive device into one. It integrates the motor, transmission and braking device into the wheel hub, commonly known as the wheel hub motor. According to the application of the wheel hub motor on cars, it can be mainly divided into two types. The wheel hub motor used in general electric cars is not a servo motor, but a permanent magnet DC motor.
The so-called permanent magnet motor refers to a motor whose coils are excited by a permanent magnet, rather than by a coil excitation. This saves energy consumed by the excitation coil, improves the mechanical-electrical conversion efficiency of the motor, and reduces the driving current, which is significant for electric vehicles using limited onboard energy. According to the mechanical structure of the motor assembly, it can be generally divided into two categories: "with teeth" (motor speed is high, and needs to be reduced through gears) and "teethless" (motor torque output is not reduced through any reduction).
The use of a wheel hub motor makes the vehicle structure simpler, achieving better spatial utilization and layout flexibility, without the need for a complex mechanical transmission system. At the same time, the transmission efficiency is much higher.