Is the motor the biggest problem for electric vehicles?
In recent years, the state and relevant departments have vigorously advocated energy conservation and emission reduction. The launch of electric vehicles has attracted the attention of many auto and parts companies. Electric vehicles have become a hot trend in China's future auto industry.
Nowadays, the development of electric vehicles is getting faster and faster, and the research and development of electric motor motors has attracted everyone's attention. However, there are very few people who really understand electric motor motors. Xiaobian for everyone to collect a variety of information, for everyone to talk about the knowledge of electric car motor, and the new energy motor list. Let us explore the high-tech car heart!
1. The status of electric vehicle motor
The electronic control system is the brain of the electric vehicle, which directs the operation of the electronic components of the electric vehicle. The in-vehicle energy system is the core technology in the electronic control system. It is a link between the battery and the battery pack and the whole vehicle system, including the battery. Management technology, in-vehicle charging technology and DCDC technology and energy system bus technology. Therefore, the vehicle energy system technology has increasingly become an important direction of industrial application technology research, and it has increasingly become an important symbol of industrial development. At present, this technology has become an important bottleneck restricting the convergence and development of the electric vehicle industry chain.
2. Industrial transformation of electric vehicle motors
Electric vehicles have shown signs of transformation from research and development to industrialization. The core automobile manufacturers and core components manufacturers such as power storage batteries, drive motors and controllers have grown and expanded in several years of promotion and demonstration work, and launched a series of products that meet performance requirements. . However, as the key component technology of the key technologies of the motor, battery and other key components, its reliability, cost, durability and other major indicators can not meet the needs of the development of electric vehicles, and become the main constraints of the development of electric vehicles.
3. Difficulties in research and development of electric vehicle motors
From the perspective of the electric vehicle industry chain, the beneficiary side may mainly concentrate on the core components, and the upstream resource side will benefit more from the companies with strong resource control.
The main reasons for R&D difficulties are as follows:
First: The battery is the biggest bottleneck in current electric vehicle technology and cost.
Second: due to the scarcity of mineral resources, lithium, nickel and other upstream resource companies will also have greater profits.
Third: OEMs are currently chaotic and have no established monopoly leadership. They should first focus on those who have core technologies or have mature, commercially available models.
4, electric vehicle motor requirements for the drive system
High voltage, small mass, large starting torque and large speed range, good starting performance and acceleration performance, high efficiency, low loss and high reliability. There are several key issues to consider when choosing an electric vehicle motor drive system: cost, reliability, efficiency, maintenance, durability, weight and size, noise, and more. When selecting a motor for a pure electric vehicle, it includes the choice of motor type, power, torque, and speed.
5, electric car motor classification
The motors used in electric vehicles now mainly include DC motors, AC induction motors, permanent magnet motors and switched reluctance motors.
1), electric vehicle DC motor
Advantages: The starting acceleration is huge, the electromagnetic torque control characteristics are good, the speed adjustment is convenient, the control device is simple, and the cost is low.
Disadvantages: There is a mechanical commutator. When running under high speed and large load, there is spark on the surface of the commutator, so it is not suitable for the motor speed. Compared with other drive systems, it is at a disadvantage and has gradually been eliminated.
2), electric vehicle AC induction motor
The stator of the AC induction motor is used to generate a magnetic field, and is composed of a stator core, a stator winding, an outer casing of the iron core, and a bearing supporting the rotor shaft. AC motors have the advantages of low price, maintenance, and small size, but the control of AC motors is more complicated. It has become the first choice for AC-driven electric vehicles.