In recent years, with the development of the national economy and the increase in the income of residents, China's automobile production and sales have consistently ranked first in the world. In 2017, production and sales volume reached nearly 30 million. China's new energy automobile industry began in the early 21st century. In 2001, the new energy vehicle research project was included in the “863” major scientific and technological issue during the National “Tenth Five-Year Plan” period.
New energy vehicles have three major advantages: environmental protection, economy and simplicity. This is especially true in pure electric vehicles: the electric motor is replaced by a motor and driven by a motor without the need for an automatic transmission. Compared with the automatic transmission, the motor has a simple structure, mature technology and reliable operation.
The drive motor system is one of the three core components of the new energy vehicle. The motor drive control system is the main execution structure of the new energy vehicle. The driving characteristics determine the main performance indicators of the car. It is an important part of the electric car. The entire drive system of an electric vehicle includes two parts, a motor drive system and its mechanical transmission mechanism. The motor drive system is mainly composed of a motor, a power converter, a controller, various detection sensors, and a power supply.
China's existing new energy drive motor type
1, asynchronous motor
2, permanent magnet brushless motor
3, switched reluctance motor
4, DC motor
Today we will introduce in detail the application of permanent magnet motor in new energy vehicles.
With the rapid development of power electronics technology, microelectronic technology, microcomputer technology, rare earth permanent magnet materials, sensor technology and motor control theory in recent years, AC drive technology has gradually matured.
The permanent magnet brushless motor has the advantages of high power density, small size, high efficiency, simple and firm structure, easy maintenance, and the operation and maintenance cost of the electric vehicle drive system using the permanent magnet brushless motor as the driving component is low; And the modular structure design makes the drive interface flexible, the control ability is stronger, the operation is more comfortable; the application of the energy feedback brake technology can reduce the wear of the brake pad and increase the driving range of the car.
Therefore, based on the development needs and technology status of the electric vehicle market, designing and developing a fully digital electric vehicle permanent magnet brushless motor drive system with reliable, low cost and excellent performance has important practical significance for the development of the electric vehicle industry.
