Drive system integration into future trends
The development of drive motors is increasingly moving toward low cost, light weight, miniaturization, high efficiency, and integration. The integration is the fastest implementation of small size, light weight, low cost and high efficiency. Usually, the integration of the drive system includes two categories, which are classified into two categories according to the blue book, electromechanical integration and power electronics integration.
According to the Blue Book, electromechanical integration mainly includes the integration of motor and engine assembly or motor and gearbox. It is characterized by high efficiency/high speed motor and high efficiency transmission to improve drive system efficiency and power density to reduce cost. Power electronics integration, based on ICBT devices, capacitors, high-efficiency heat dissipation technology (such as double-sided cooling), high-power density power electronics integration technology to achieve power density multiplication of vehicle power electronic systems, reduce costs; motor controller and car charging The machine's organic top-up integration enables high-power fast charging. At the same time, on-board power electronic integration technology based on digital control, functional safety design as the target, electromagnetic compatibility as the constraint, high reliability and multi-topping combination, is developing towards the safety design of ISO26262 automotive industry products.
With the continuous upgrading of motor technology and control technology, wheel hub motors are also widely used in electric vehicles. Wheel hub motors have long been used in automobiles. For example, IZA pure electric vehicles, which were launched by TEPCO in Japan in 1991, use four-wheel drive of hub motors. The hub motor is highly integrated by integrating the motor into the hub. It is easy to install, flexible in power control, easy to implement braking and energy recovery, saves body control, high freedom of design, simplified drive system, etc. An important direction of system development.
With the development of electronic technology, DSP motor control chip is becoming more and more mature. The all-digital control system based on CAN bus has become an important mode of hardware composition of electric vehicle control system, and the integration technology of motor control system has also matured. The drive motor control system will be developed towards miniaturization, light weight, easy industrialization, high capacity, high efficiency and energy saving, rapid response, good speed regulation performance and high reliability.
In general, electric vehicle motor technology will focus on the development of permanent magnet hub motors and switched reluctance motors, especially permanent magnet hub motors, and the simultaneous development of the third generation of wide bandgap power devices and electronic control systems. In the future, electric motor motors will be more efficient, smaller, lighter, and more integrated, with lower prices and higher performance!