Why do electric car motor companies like to use permanent magnet motors - 1 views
started by kbojezhang44 on 21 Apr 20
started by kbojezhang44 on 21 Apr 20
started by kbojezhang44 on 21 Apr 20
started by kbojezhang44 on 21 Apr 20
Compared with other types of motors, the biggest advantage of permanent magnet synchronous motors is higher power density and torque density. Delta said frankly, compared with other types of motors, permanent magnet synchronous motors can provide maximum power output and acceleration for new energy vehicles at the same mass and volume. This is also the main reason why permanent magnet synchronous motors have become the first choice for most automobile manufacturers in the new energy vehicle industry, because the new energy vehicle industry requires extremely high space and self-weight.
In addition to permanent magnet synchronous motors, asynchronous motors have also attracted widespread attention due to the use of Tesla. Compared with synchronous motors, the speed of the motor rotor is always less than the speed of the rotating magnetic field (generated by the stator winding current). Therefore, the current frequency of the rotor and stator windings always appears "inconsistent", which is why it is called an asynchronous motor.
Compared with permanent magnet synchronous motors, asynchronous motors have the advantages of low cost and simple process. Of course, its disadvantage is that its power density and torque density are lower than those of permanent magnet synchronous motors. The reason why Tesla chose asynchronous motors instead of permanent magnet synchronous motors is not only the main reason for control costs, but also a very important factor, that is, larger models can have enough space to accommodate relatively large asynchronous motors.
In addition to synchronous and asynchronous motors, hub motors are also hot spots for new energy automotive motor applications. The biggest feature of the hub motor is the integration of the vehicle's power unit, transmission unit and braking unit into the hub. Compared with traditional power plants, the advantages of hub motors are obvious. Due to the large number of transmission components saved, the vehicle structure is relatively simple. Of course, in the synchronous control of the motor and the wading seal, the wheel motor still has many problems to be solved.