Why is permanent magnet synchronous motor more popular than AC asynchronous motor?
Why is permanent magnet synchronous motor more popular than AC asynchronous motor?
According to the characteristics of permanent magnet synchronous motors and AC asynchronous motors, permanent magnet synchronous motors are more suitable for frequent start and stop working conditions, while AC asynchronous motors (induction motors) are more suitable for high-performance and high-speed working conditions, which is why The reason why high-performance electric vehicles such as Tesla and Weilai all use AC asynchronous motors.
Analysis of advantages and disadvantages | ||
Motor type | Advantages | Disadvantages |
Permanent magnet synchronous motor | Torque density, power density, high efficiency, top speed regulation performance, small size, light weight | High cost, large temperature difference,variable magnetism, poor reliability of high vibration |
AC asynchronous motor | Simple structure, high reliability, low cost, weak magnetic field, easy to control, acceleration performance, high speed performance | Torque density, low power density, low efficiency, need to be equipped with a cooling system, large size, heavy weight |
Judging from the characteristics listed in the table, the reason why permanent magnet synchronous motors are favored by most car companies seems to be very simple.
It is nothing more than that the torque density, power density and efficiency of permanent magnet synchronous motors are all at a similar technical level. It is better than AC asynchronous motors, which is of great benefit to improve the energy efficiency of vehicles and extend the cruising range.