#2023懂车帝冬测#
Huawei is developing a high-speed flat wire motor with a maximum speed of 25,000 rpm, and the all-in-one electric drive with integrated high-speed flat wire motor will be mass-produced in 2024.
Tesla has achieved a speed of 19,000 rpm, Zeekrypton 001 FR has achieved a speed of 20,620 rpm, and Huawei's electric drive system DriveONE has a maximum speed of 22,000 rpm.
The ways to solve the problem of high-speed driving of electric vehicles are:
One is: like the Porsche Taycan, it uses a low-speed motor and a two-speed gearbox to bring different gear ratios to solve high-speed problems (the gear ratios are 15:1 and 8:1 respectively, the first gear controls the acceleration of about 2 seconds, and the second gear achieves a maximum speed of more than 250 km/h).
The second is: like Tesla Model S Plaid and Zeekrypton 001 FR, they use ultra-high speed motors of more than 20,000rpm to ensure that they can accelerate and run at high speeds.
Specific applications of high-speed motors:
SAIC Zhiji: The LS6 is equipped with a "hurricane motor", which adopts the industry's first customized ultra-pressure-resistant ceramic bearing, with a peak speed of 21,000rpm;
FAW Hongqi: A new generation of high-performance M220 modular electric drive system, with a maximum motor speed of 22,000r/min, mass production in 2024;
Huawei is developing a high-speed flat wire motor with a maximum speed of 25,000 rpm, and the all-in-one electric drive with integrated high-speed flat wire motor will be mass-produced in 2024.
The intrinsic link between high rotational speed and low cost, as the torque output of a motor is positively correlated with its volume. When the output torque requirement of the motor is reduced, the volume of the motor can be reduced, and the amount of electromagnetic materials used in the motor (core, magnet, stator winding) can be reduced, thereby reducing the cost of the motor;
New energy vehicles have a fixed demand for torque at the wheel end, and to reduce the output torque of the motor, it is necessary to increase the speed ratio of the reducer to ensure the torque at the wheel end. However, it reduces the top speed of the vehicle, so it is necessary to compensate by increasing the speed of the motor. Therefore, after the motor reduces the torsion growth rate, it can reduce the cost of the motor while ensuring the power demand of the vehicle.
Expert comments: High rpm can bring a series of advantages, such as good power performance, fast acceleration, etc. At high speeds, if the constant power output is maintained, the motor will be louder, and when rotating at high speeds, it will produce a lower center of gravity, which is conducive to extending the control distance and improving stability. However, high rotational speeds can also pose problems such as increased body vibration and noise, increased battery energy consumption, higher bearing requirements, and greater heat dissipation requirements. Therefore, in practical application, it is also necessary to combine the positioning of vehicle products to make a comprehensive selection. If Huawei can deliver stably and reliably, it will create another technical strength for Huawei's new energy vehicles. The fierce competition in the new energy market has promoted the substantial improvement of basic technologies.
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