What are the types of electric motors for new energy vehicles? (2)

2、 AC asynchronous motor is a widely used type of motor in industry, which places the rotor in a rotating magnetic field to obtain a rotational torque under the action of the magnetic field. The rotor is mostly a squirrel cage shaped rotatable conductor. The controller of AC asynchronous motor adopts pulse width modulation to achieve power conversion from high-voltage DC to three-phase AC, uses frequency converter to achieve motor speed regulation, and uses vector control or direct torque control to achieve fast response of torque control, meeting the requirements of load change characteristics. The advantages of AC asynchronous motors lie in their simple structure, good stability, no direct contact between the stator and rotor, no dependence on magnetic field generation, strong operational reliability, high speed, low maintenance costs, but their shortcomings include high energy consumption, fast rotor heating, and the need for a cooling system for long-term high-speed operation; Due to its good constant speed performance, the adjustability is poor, requiring the assembly of additional speed controllers. At present, AC asynchronous motors are mainly used in electric buses, commercial vehicles, and logistics vehicles with low space and speed performance requirements. From the current perspective, this type of motor will not become a trend.

3、 As a new type of motor, the switched reluctance motor has a simple structure compared to other types of drive motors. The stator and rotor are all double salient structures made of ordinary silicon steel sheets, and there is no winding on the rotor. The stator is equipped with a simple concentrated winding, which has the advantages of simple and sturdy structure, high reliability, light weight, low cost, high efficiency, low temperature rise, and easy maintenance. Although the structure of a switched reluctance motor is simple, the design of the control system is relatively complex, requiring position detectors, nonlinear system characteristics, and a jumping magnetic field rotation. In the actual operation process, the noise and vibration emitted by the motor itself are significant, especially under load operation. Therefore, switched reluctance motors must overcome these two technical obstacles in order to be widely applied in the field of electric vehicles.

With the development of science and technology, new energy vehicles have gradually replaced fuel vehicles. At the same time, the motor testing plan for new energy vehicles has also been updated synchronously. More comprehensive knowledge of motor testing for new energy vehicles is available. Welcome everyone to come and enjoy!

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