At present, electric vehicle motor controllers mostly use three-phase full-bridge voltage -type inverter circuit topology, and some products are pre-mounted with bidirectional DC/DC converters to increase the input AC voltage at the motor end , increase the output power at high speeds , and reduce motor design and production costs. The DC support capacitors in traditional controllers are bulky and poor in high temperature resistance. According to comprehensive technology and market trend analysis, in the future, the three technical development directions of vehicle drive motor systems are permanent magnetization, digitalization and integration.
1. Permanent magnetization means that permanent magnet motors have the advantages of high power density and torque density, high efficiency, and easy maintenance. At present, the trend of permanent magnetization of motors is becoming prominent. The data at a glance shows that the proportion of permanent magnet synchronous motors used in new energy vehicles in my country has exceeded 90%.
2. Digitization includes the digitization of the drive control, the digitization of the interface between the drive and the numerical control system, and the digitization of the measurement unit. Use software to replace hardware to the greatest extent , with protection , fault monitoring, self-diagnosis and other functions.
3. Integration is mainly reflected in two aspects: 1) motor: integration of motor and engine assembly, motor and gearbox assembly; 2) controller: integration of power electronics assembly (power device, drive, control, sensor, power supply , etc. ) . In the future, it will be a trend to integrate the motor, reducer, and controller, which not only reduces the size, but also makes the product more standardized.
At present, mainstream motor control companies are mainly divided into two categories: one is electric vehicle complete vehicle enterprises, and the electric vehicle motor .html controllers produced by them are generally supplied to their complete vehicle products; the other is electric vehicle parts enterprises, and the electric vehicle motor controllers produced by them are generally supplied to specific or non-specific complete vehicle enterprises.
In the field of passenger vehicles, vehicle manufacturers usually have strong comprehensive strength. They usually independently develop and produce electric vehicle motor controllers, or focus on independent research and development and production, supplemented by appropriate procurement of products from component companies. In the field of passenger vehicles, vehicle manufacturers usually lack experience in motor controller research and development, and generally choose to outsource electric vehicle motor controllers. A small number of large-scale vehicle manufacturers will choose independent research and development and production or a combination of independent research and development and production and outsourcing.
