Electric drive is the future direction of the car, but the pure electric car represented by Tesla is just replacing the engine with a motor, and still uses the gearbox for power transmission. Why not drive four wheels directly with four motors? Combined with computer control technology for precise control of each wheel, is this not much stronger than four-wheel drive, dual clutch and other technologies? We know that for conventional cars, clutches, transmissions, drive shafts, differentials and even transfer cases are essential, and these components are not only lightweight, but also make the structure of the vehicle more complicated. And the failure rate problem, if the motor is directly driven by the hub, it can greatly reduce the entire transmission, braking and other system components, making the vehicle structure simpler, and also providing the transmission efficiency of the whole vehicle. In response to this idea, as early as the 1970s, automobile manufacturers proposed wheel hub motor technology. However, the entire automobile field was mainly driven by internal combustion engines, and because of the size of the internal combustion engine, it was difficult to integrate into the hub, so the hub motor was also limited. The development of technology. So what is the hub motor technology? 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. The hub motor has the characteristics of independent driving of a single wheel, so it can be realized relatively easily in the front, rear or four-wheel drive form, and the hub motor can realize the differential of similar tracked vehicles by different speeds of the left and right wheels or even reverse. Steering greatly reduces the turning radius of the vehicle, and in the special case, almost in situ steering can be achieved. With the development of new energy vehicles, many cars are driven by electric drive. Therefore, the driving technology of the hub motor is also used. Not only can the hub motor be used as the main driving force, but also can be used to provide start and rapid acceleration. The power of the brakes and the braking force during braking, and the energy recovery technology in the field of new energy vehicles can also be easily realized. In terms of control, the four-wheel drive can be easily realized by individually controlling the motor of each hub, and the differential can be performed on the four wheels. Control achieves different grip distribution and improves the efficiency of electric vehicles. However, there are still some technical difficulties in wheel hub motor technology that need to be broken. The main points are as follows: The hub motor system integrates various functions such as driving, braking and load bearing, and the optimization design is difficult; The internal space of the wheel is limited, the motor power density performance is high, and the design is difficult; The integration of the motor and the wheel results in an increase in the mass of the unsprung, which deteriorates the vibration isolation performance of the suspension and affects the handling and safety of the vehicle under uneven road conditions. At the same time, the hub motor will withstand a large road impact load motor anti-vibration requirements are demanding; Water and dirt on the wheel parts are easily accumulated, resulting in corrosion damage of the motor and life reliability is affected; Fluctuations in the running torque of the hub motor may cause vibrations and noises in the tires, suspensions, and steering systems of the vehicle; Since the hub motor is directly integrated in the hub, it requires strict control requirements on the drive's control accuracy, response time, and control stability, otherwise there will be serious safety hazards. In response to the above technical difficulties, ZLG Zhiyuan Electronics has launched a mature test program, the MPT1000 motor test system, for the control system stability, control accuracy, response time, torque ripple and motor performance efficiency of new energy vehicles. And the company's free-loading engine technology enables millisecond-level control and testing of motor drives, escorting the development of hub motors in the field of new energy vehicles. Blower Fan,Mini Blower Fan,Industrial Air Blower,Squirrel Cage Blower Foshan Shunde Josintech Electrical Appliance Technology Co.,Ltd , https://www.josintech.com
