Industrialization problems are to be broken
Although Hubei Tate, Zhejiang Asia Pacific and other companies are eager to set 2018 as the first year of industrialization of wheeled motors, and strive to achieve the official loading of mass production products this year, in the eyes of some industry experts, the market conditions of wheel motors Not mature.
First, the wheel technology has obvious technical shortcomings. "Wheel motor is not a new technology in recent years. It has been in the early decades. Why did everyone use central motor technology instead of wheel motor technology? Because this technology has obvious short plates, the electrode material is overheated and demagnetized. The increase in the quality of the unsprung has hindered its industrialization process," an electric vehicle expert who did not want to be named told the Economic Observer.
According to the expert, the hub motor is loaded in a small wheel, which is prone to overheating and the motor overheating. In addition, the brake can cause the motor to overheat. Overheating can cause the motor material to demagnetize, which directly affects the performance of the vehicle. There is also the problem of unsprung quality. For decades, automotive engineers have used various designs and materials to reduce the quality of the unsprung. The use of a hub motor greatly increases the unsprung mass and also increases the moment of inertia of the hub. “With a hub motor, almost the entire vehicle chassis has to be redesigned.”
However, Lu Chao introduced that the wheel motor of the Dutch e-Traction has solved the problem of overheating and unsprung mass of the motor. “The material demagnetization occurs at temperatures above 140 °C. Our technology can control the temperature of the motor below 100 ° C. As for the unsprung mass, we provide more than just a motor, but a complete set of electric drive solutions.”
Second, the problem of product reliability and consistency, the hub motor is loaded in a small space of the wheel, the complex external environment is more severe, and higher requirements are placed on waterproofing, shock absorption and heat dissipation. "It is best to develop jointly with the whole vehicle company from the beginning, so it is more insurance." The above experts believe that the problem is that the current wheel hub motor is still a new technology for domestic enterprises, "waiting for more research, dare to install Not much on the production car."
In addition to technical maturity and product reliability, price is also a challenge for the marketization of wheel motors. "The price of the hub motor is obviously higher than that of the central motor. There is no advantage in price. For now, most companies are still willing to adopt the central motor. After all, it is cheap and mature," said a local motor company official.
"From the perspective of the whole vehicle, for the true meaning of electric vehicles, the hub motor has no possibility of industrialization in the '13th Five-Year Plan.'" Xu Xiangyang, a professor at the School of Transportation Science and Engineering at Beijing University of Aeronautics and Astronautics, said. In foreign countries, Protean, the pioneer of wheel motor, has cooperated with many OEMs of Ford, Volkswagen and Mercedes-Benz, but its products are mainly assembled on the exhibition car and prototype, and there is no mass production. Under the circumstance of the outside world, whether it is possible to obtain the recognition of domestic vehicle manufacturers and realize the mass production of wheel hub motor products is a big challenge for Lu Chao and Hubei Tate this year.