Why did Tesla use cheap 3 phase induction motor?

Why did Tesla use cheap 3 phase induction motor?

Why did Tesla use a three-phase induction motor?

The power performance of electric vehicles is reflected in two aspects: the maximum speed and the 100-kilometer acceleration time. It is determined by the output power of the motor, and the output power of the motor is determined by the speed and torque. Tesla uses a three-phase induction motor, that is, a three-phase AC asynchronous motor., can be driven by ultra-high voltage and weak magnetism, At the same time, by driving the motor control system such as the frequency converter, the high speed of the motor at 600NM can be achieved, thus ensuring that the Tesla motor output high power, thus improving the Teller power performance.

Although the three-phase induction motor has the advantage of large output power and large working temperature difference, there are also three major deficiencies. First, it is difficult for the rotor to heat up, waste energy, and heat dissipation at high speed. This has a negative impact on the range of electric vehicles and safe driving; The second is that the torque of the motor after speeding will rapidly decrease, so the acceleration performance within 100KM is excellent, but the acceleration performance above 100KM will be greatly reduced, which is why Tesla does not promote more than 100KM acceleration time; In addition, the need to increase the number of drive controllers and frequency converters will not only increase the cost and energy consumption of the motor, but also increase the size and weight of the motor; From this, it is rumored that after Shuotesila built a factory in China, with the help of China's local rare earth resource advantages, permanent magnet synchronous motors will be used in the Chinese market to achieve energy conservation and weight reduction problems.