With the rapid development of integrated circuits, earth shaking changes have taken place in many industries, such as the automotive industry. Motor controller is a kind of integrated circuit applied in automobile, which plays a great role.

What is a motor controller?

For the definition of motor controller, the official explanation is that it is an integrated circuit that controls the motor to work according to the set direction, speed, angle and response time through active work. In the electric vehicle, the function of the motor controller is to convert the electric energy stored in the power battery into the electric energy required to drive the motor according to the instructions of gear, throttle and brake, so as to control the driving state of the electric vehicle, such as start-up operation, climbing force and so on.

Based on different research purposes, there are many kinds of motors. At present, the motor of electric vehicles basically uses AC motor. At present, the mainstream motor for mainstream vehicles is permanent magnet AC motor, which has three characteristics: first, it has simple structure and safe and reliable operation; Second, the motor has small volume, light weight, low power consumption and high work efficiency; Third, the shape and size of the motor are flexible and diverse. The motor controller is composed of inverter and controller. The inverter receives the DC electric energy transmitted by the battery and reversely turns into three-phase AC to provide power for the automobile motor. Secondly, the controller receives the motor speed and other signals and feeds them back to the instrument. When braking or acceleration occurs, the controller controls the rise and fall of the frequency converter, so as to achieve the purpose of acceleration or deceleration.

What is the future of motor controller?

The work of the motor controller is not only its own, but also can be used to cooperate with the motor, such as driving permanent magnet synchronous motor, servo motor and split DC motor. With more and more integrated functions, it means higher and higher security requirements. The safety performance needs to be realized through the combination of many chip architectures, such as SBC + MCU monitoring architecture, high-voltage backup power supply, safety related drive chip, comprehensive diagnosis of IGBT fault, independent safety shutdown path, rotary signal decoding of independent ADC channel, two-way high-voltage sampling circuits of different quality, three-phase current Hall sensors of different quality, etc. With the development of devices and sub packaging technology, the cost prediction will be gradually reduced. From the perspective of sub packaging, the traditional easy-to-use module is developing towards square brick, ultra-thin shape, and finally bare DBC / chip.

From the chip point of view, the motor controller is developing towards high efficiency and high operating junction temperature. If the junction temperature of E3 chip is 150 ℃, the junction temperature of edt2 chip can be increased to 175 ℃, and the junction temperature of SiC chip can exceed 175 ℃. Using SiC devices can significantly reduce switching loss, improve system efficiency, reduce dead time and improve system output capacity. The direction of IGBT in the motor is 650V, and the design of IGBT is higher than 750V and 1200V. The EMC level will be higher and higher. The next step should be the level of class 5. Now the second generation products may be able to achieve class 3 and class 4. In the future, if EMC wants to achieve class 5, the measures should be miniaturized and the cost should be lower.

With the progress of intelligent technology, there are many kinds of motor controllers, and intelligent controller may be the most common one, because it can use microprocessor to control the power components used in motor control, monitor the load of motor and match the torque and load of motor. This design is to reduce the AC voltage to the motor and make the motor safer, Because the car must be safer and intelligent.