Integration and Efficiency Innovation of DC/AC Vehicle Motor Controllers, Large Scale Implementation of SiC Devices
Time：May 27,2026
In 2026, the DC/AC on-board motor controller (MCU), as the power core of new energy vehicles, will usher in a comprehensive reform of integration, efficiency, and high voltage. The large-scale implementation of silicon carbide power modules will promote a leapfrog improvement in the performance of electric drive systems. The motor controller is responsible for converting the DC power of the power battery into the AC power required to drive the motor. Its performance directly determines the vehicle's power output, energy consumption performance, and endurance. Currently, the industry focuses on three core goals: high power density, high conversion efficiency, and high reliability.
The technological upgrade focuses on three dimensions: first, power device iteration, gradually replacing silicon-based IGBT with SiC modules, increasing the switching frequency by more than three times, reducing losses by 60%, and achieving the highest efficiency of the controller exceeding 99%, and the peak efficiency of the motor reaching over 96%; The second is topology optimization. The application of three-level topology technology has increased, effectively reducing harmonic distortion rates, adapting to 800V high-voltage platforms, and supporting higher voltage and power output; The third is the improvement of integration, with multi in one controllers becoming mainstream, integrating MCU, generator controller, oil pump control, PDU and other functions, reducing volume by 50%, weight by 40%, while reducing the number of high-voltage wiring harnesses and connectors, lowering the risk of failure and overall vehicle costs.
In terms of product performance, high-power controllers above 200kW are rapidly becoming popular, with peak torque ranging from 3000Nm to 6000Nm, suitable for pure electric, hybrid, and extended range vehicles in all scenarios. The range extender dedicated controller is optimized with strong anti vibration and wide temperature range characteristics. The end layout is adapted to the installation space of the range extender, and the highest power generation efficiency reaches 99.16%. At the same time, the controller and the vehicle control system are deeply coordinated, and unified scheduling is achieved through domain controllers to achieve global optimization of power output, energy recovery, and thermal management, with millisecond response speed improving the driving experience.
At the market level, the domestic motor controller market is expected to exceed 30 billion yuan in 2026, with integrated products accounting for over 70%. With the maturity and cost reduction of domestically produced SiC devices, the localization rate of controllers continues to increase, breaking the monopoly of overseas technology and promoting cost reduction and efficiency improvement in the industry. In addition, the functional safety and electromagnetic compatibility (EMC) standards continue to be upgraded, and mainstream products meet ASIL-D level and CLASS 3 EMC requirements, significantly enhancing reliability under extreme working conditions and helping to comprehensively improve the quality of new energy vehicles.
keywords： Integration and Efficiency Innovation of DC/AC Vehicle Motor Controllers, Large Scale Implementation of SiC Devices
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