Dali Technology applies for patents related to speed control methods, based on sensors to achieve motor movement speed control

April 2 News, the State Intellectual Property Office information shows that Zhejiang Dali Technology Co., Ltd. has applied for a patent titled “A Movement Speed Control Method and System Based on Position Sensors.” The application publication number is CN121770429A, the application number is CN202411381602.6, the publication date is March 31, 2026, the application date is September 30, 2024, inventors are Liang Xiaohua, Sun Lifeng, Wang Zhenxing, Wang Wei, Yu Jiawei, the patent agency is Beijing Tianda Intellectual Property Agency Co., Ltd., patent agent Li Yun, classification numbers H02P29/00, G05B11/42.

The patent abstract indicates that the invention relates to a movement speed control method and system based on position sensors, including: an improved NLSEF-TD nonlinear differential tracking controller and an improved MRC-ESO compensation type third-order expanded state observer; the differential tracking controller derives the motor speed tracking error es based on the motor angular velocity setpoint ωref and the observed motor angular velocity Z2 output by the observer; based on the tracking error es and motor parameters, an improved maximum speed control comprehensive function is used to obtain the maximum speed tracking command u_p, and based on u_p and the observed disturbance of the motor system output by the observer, an output u_out is generated, which is then used to determine the given motor torque value to control the motor; the observer is based on the given motor torque, the actual motor angle position measured by the angle sensor, and the improved motor electrical system disturbance term az to obtain the observed motor angular velocity Z2 and the observed disturbance of the motor system, which are output to the differential tracking controller.

*ST Dali was established on July 19, 2001, and listed on the Shenzhen Stock Exchange on February 18, 2008. Its registered and office locations are both in Hangzhou, Zhejiang Province. It is a well-known enterprise in China’s infrared thermal imaging field, focusing on infrared thermal imaging products, with strong technical strength and high investment value.

*ST Dali’s main business is the research, production, and sales of infrared thermal imaging products. Its industry classification is Defense Military Industry - Military Electronics II - Military Electronics III, involving delisting warning, mid-cap, IoT, and other concept sectors.

In 2025, *ST Dali achieved operating revenue of 347 million yuan, ranking 10th among 11 companies in the industry, far below the industry leader AVIC Optoelectronics’ 21.39B yuan and second-place Aerospace Electrical, with 5.82 billion yuan, also below the industry average of 4.04B yuan and median of 2.21B yuan. Among its main business, infrared and optoelectronic products generated revenue of 285 million yuan, accounting for 82.11%. In terms of net profit, 2025 saw a loss of 231 million yuan, ranking 9th in the industry, with a significant gap compared to the first-place AVIC Optoelectronics’ 2.35 billion yuan and second-place Hongming Electronics’ 461 million yuan, below the industry average of 227 million yuan and median of 102 million yuan.

Recent patent situation of Zhejiang Dali Technology Co., Ltd. is as follows:

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