Induction motors, permanent magnet motors battle for electric vehicles, who is the way forward?

Induction motors, permanent magnet motors of electric vehicles, who is the future direction?

Fuel car era, we often hear the naturally aspirated and turbocharged engine battle, and in the era of electric vehicles, there is also a clear-cut battle of the motor, after the market test, there are two kinds of mainstream motors on the market, one is induction motor (also known as asynchronous AC motor), and the other is permanent magnet motor.

Tesla Model s Induction Motor Representation

Induction motor, that is, AC asynchronous motor, which is a type of motor that is driven by the rotating magnetic field formed after the stator winding and the magnetic field of the induced current in the rotor winding to generate electromagnetic torque to drive the rotor to rotate after each other after the physical interaction. Tesla Model S (parameters | pictures) and Model X (parameters | pictures) is a representative of induction motor applications.

The permanent magnet motor mainly refers to the permanent magnet synchronous motor, and induction motor in the structure of the great difference is that the stator is a permanent magnet structure, rather than by the winding of the electric circle.

Permanent magnet motor is blossoming in the country, one is to benefit from the domestic policy to encourage the configuration of permanent magnet motor vehicles have more space to provide for the power battery. The second is to benefit from the domestic sound rare earth industry, can produce permanent magnet stator at a lower cost.

Which is better, induction motor or permanent magnet motor?

Let's use a table to visually compare the advantages and disadvantages of the two motors.

Induction motor's large size and weight is one of the main reasons for domestic automobile enterprises to give up using it, after all, it is extremely important to realize higher range at this stage, while its acceleration performance is the reason for foreign automobile enterprises to choose it.

Who is the direction of future development?

Induction motor + permanent magnet motor dual motor structure

Overall, permanent magnet motors have their own advantages over induction motors. At present, the range of electric vehicles is still an extremely important indicator, and the efficiency of permanent magnet synchronous motors can better improve the range. However, with the subsidy regression on June 26, 2019, the battle for range is gradually receding, and the number of cases combining induction motors and permanent magnet motors is increasing, such as Tesla MODEL3 (parameters | pictures) and Azera's ES8 (parameters | pictures), both of which use the dual-motor structure of induction motors + permanent magnet motors.