Discussion on the Selection Principle of Electric Motor Drive Motor
After China's new energy vehicles have clearly defined the pure electric drive technology route, the selection design of the drive motor is particularly important. The following discusses the selection principle of electric vehicle drive motors.
First, drive the motor characteristics of the car
(1) The dynamic performance requirements of the drive motor torque control are higher, the better the dynamic performance, the higher the motor technology level;
(2) The motor is required to provide a higher torque, and is generally capable of withstanding an overload of 4-5 times;
(3) The drive motor not only requires high operating efficiency, but also requires the speed range to be as large as possible;
(4) It is required that the motor not only has good driving performance, but also takes into account the function of the generator, and requires high power generation efficiency.
(5) The drive motor must be required to reach the automotive grade. Generally, industrial grade motors cannot be used directly in automobiles.
(6) The relative space inside the electric vehicle is small, and the driving motor is required to be light in weight and small in size.
Second, the main indicators of the constrained drive motor
(1) Acceleration capacity (s): the minimum time required for an electric vehicle to accelerate from a standstill to a certain speed;
(2) Maximum speed (km/h): The maximum speed that an electric car can reach.
(3) Maximum mileage (km): The maximum mileage of an electric vehicle after the battery is fully charged.
Third, the selection principle of electric vehicle drive motor
1) Products that are mature in technology but cannot be eliminated by technology;
2) Products with the latest technology but with stable performance;
3) In principle, the permanent electric motor is selected in the current electric vehicle special vehicle;
4) In principle, the permanent magnet synchronous motor is also used in the electric bus. However, it is also a better solution to use the vector control method to control the asynchronous motor.
Fourth, the basic conclusion
1) The early DC motors were basically eliminated, even though the trolley buses were basically not used;
2) Actively try to use switched reluctance motors, which should not be used in batches at present;
3) For the current electric logistics special vehicle, it is not advisable to use the vector control method to exchange the asynchronous motor in batches;
4) Electric car bus In principle, the 8-meter bus is recommended to use permanent magnet synchronous motor, the electric bus more than 10 meters, is the AC asynchronous motor with vector control, or the permanent magnet synchronous motor? It is necessary to add more More reference factors, and then further argumentation.
