As one of the core components of new energy vehicles, electric drive system has an important influence on the performance of new energy vehicles, and is of great significance to the power, economy, comfort, safety, reliability and durability of new energy vehicles.
To improve the technical level and quality of electric drive, we need to start with key technologies such as driving ability, driving efficiency, control accuracy, system stability, electromagnetic performance and working life. In addition, from the demand of industrialization, low cost, miniaturization and intelligence are the core of the core.
The electric drive system of electric vehicle is mainly composed of four parts: drive motor, transmission, power converter and controller. Drive motor is the core of electric drive system, and its performance and efficiency directly affect the performance of electric vehicles. The size and weight of the drive motor and transmission will also affect the overall efficiency of the car. Power converter and controller have a great relationship with the safe and reliable operation of electric vehicles.
The secondary market has a very clear understanding of traditional new energy drive motors. For example, the motor consists of stator, rotor, end cover, bearing, junction box and terminal. Among them, the so-called flat wire motor is that the shape of the wires used in the designated sub-winding changes from several thin round wires to several thick square wires, commonly known as flat wires.
Advantages of flat wire motor
The first advantage is the same power, smaller volume, less materials and lower cost, or the same volume, the tank filling rate and power density increase. The round line became a flat line. Theoretically, the filled copper can be increased by 20-30% under the premise of unchanged space, which is equivalent to an increase of 20-30% power to some extent.
The second advantage is better temperature performance. The internal gap is smaller, the contact area between flat wires is larger, and the heat dissipation and heat conduction are better; The winding has better contact with the iron core slot and better heat conduction; The motor is very sensitive to heat dissipation and temperature, so the heat dissipation becomes better and the performance will be improved. Through the simulation of temperature field, it is concluded that the winding temperature rise of the flat copper wire motor with the same design is lower than that of the round copper wire motor 10%.
The third advantage is that the electromagnetic noise is lower. Make the armature have better rigidity and restrain armature noise; The cogging torque can be effectively reduced by using a relatively small notch size, thus reducing the electromagnetic noise of the motor.
The fourth advantage is short end, saving copper and improving efficiency. Due to the process problems of traditional round wire motors, the ends are generally left long, otherwise the copper wire will be easily damaged in the process. For the flat wire motor, because the wires are all hard wires, the ends can be made smaller during processing, saving copper materials and improving efficiency.
Flat wire motor is the development trend in the future.
Judging from the current development trend of new energy vehicles, the substitution of flat wire for round wire is accelerating. Flat-wire motor is a winding technology, which has a good trajectory and complex manufacturing process, and has a high technical premium at present. The domestic mainstream new energy vehicles that are ready for mass production use flat wire motors, and the iterative technology keeps moving forward. Tesla, Volkswagen MEB and BYD are expected to launch cars equipped with flexible flat cable Motor this year.
Domestic related companies:
Jingda shares:
The company is located in Tongling City, Anhui Province. Its main products are enameled wires, copper bars and aluminum bars, electronic wires, bare copper wires, special conductors and vehicles. The output of enamelled copper round wire and enamelled aluminum round wire ranks first in China. At present, the company's flexible flat cable technology is leading in the whole industry, breaking the monopoly position of foreign-funded enameled wire factory in flexible flat cable for new energy vehicles in China. In 2020, it successfully passed the certification of German, American and domestic new energy automobile manufacturers. At present, Jingda is the most mature flat wire technology enterprise in China. The company's flat wire yield is close to 90%, and the peers are still at the level of 30-40%. The company has obvious first-Mover advantage and few domestic competitors. At present, the company accelerates the expansion of production capacity.
Founder automobile:
Yi Cao, vice president of Founder Motor's New Energy Electric Drive Division, introduced that the flat wire motor independently developed has been put into use after preliminary testing. According to the latest research summary, the company's flat wire motor has entered the supply chain of Weilai and Geely Automobile.
Great Wall Technology:
According to the Secretary-General's interactive news:
Flush Financial Research Center On June 18, some investors asked Great Wall Technology that the IPO of the company included 7000 tons of electromagnetic wires for electric drive of new energy vehicles. Is it a small flat wire? What car companies supply the small flat line? thank you
The company replied that, dear investors, hello, the special wire project for new energy vehicles and high-efficiency motors raised by the company's ipo includes both round wires and flat wires. The specific supply situation of the company involves trade secrets, and it is not convenient for the company to disclose it for the time being. Thank you for your attention!