Dual three-phase permanent magnet synchronous motors (DTPMSM) are used in the steer-by-wire system of electric vehicles that require high reliability. Multiple faults should be considered for the steering system, such as open-circuit faults and speed sensor faults. However, the current speed sensorless control methods of the dual three-phase motor are mainly derived from the promotion of the three-phase motor. They fail when an open-circuit fault occurs, leading to the failure of fault-tolerant control. Researchers have noticed this problem and proposed many methods, but they are very complicated and computationally intensive. This paper proposes one type of improved model reference adaptive system (MRAS). By adding certain fault-related restraints to the output of the adjustable model, speed sensorless control can automatically fit the open-circuit fault and estimate accurately even if an open-circuit fault occurs, which makes sure the whole system continues to operate. Simulation results are presented that contain normal operation, open-circuit fault operation, fault-tolerant control operation, and the whole process from start to fault-tolerant operation. The results show that no matter what period the motor is in, the improved speed sensor can accurately estimate the motor speed and position. The improved model reference adaptive system is significant for improving the reliability of the motor steering system and ensuring the safety of people and property.

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In today’s highly developed information age, Chinese cultural heritage is gradually shrinking, and some of them are even in danger of disappearing. In this paper, the study of Chinese cultural heritage pattern information visualization from a digital perspective is based on the 3D modeling technology method, firstly, the acquisition of cultural heritage data is studied, and the principle and method of cloud data alignment are analyzed. The data of regular surface cultural heritage and heterogeneous complex surface cultural heritage patterns are processed respectively, and the basic theoretical basis of surface reconstruction is given, including data parameterization, surface interpolation method, and surface approximation method. Based on the comparison of the accuracy of three different methods for visualizing the information of Beijing cultural heritage patterns, the experimental analysis shows that the 3D model technology information visualization is highly accurate and stable, always maintaining an accuracy of 0.8, with low technical requirements, and the limitation is that it is not suitable for use in highly complex cultural heritage. The analysis shows that the information visualization of Chinese cultural heritage patterns is conducive to the protection of the dissemination and transmission of Chinese cultural heritage, and helps young people to establish correct socialist core values under the inculcation of Chinese cultural heritage.