Unbalanced Compensation Control for Active Bearing Rotor System Based on Variable Step and Angle Search Algorithm
Chen Liangliang1, Guo Zhicheng1, Jin Xiaoguang1, Jiang Hongyu1, Zhu Changsheng2
1. School of Information Engineering Nanchang Hangkong University Nanchang 330063 China; 2. College of Electrical Engineering Zhejiang University Hangzhou 310027 China
Abstract：In the active magnetic bearing rotor system, due to uneven rotor materials, manufacturing errors, and assembly errors, the rotor’s center of mass is inconsistent with the geometric center. It generates unbalanced forces during the rotor system’s operation and causes unbalanced vibration. Thus, compensating for the rotor’s unbalanced force is necessary. This paper proposes an unbalanced compensation control strategy based on a variable step size and angle search algorithm for the rotor system of electromagnetic bearings. Firstly, the principle of unbalanced compensation was analyzed, and the expression of the unbalanced compensation force was derived. Subsequently, the system diagram of the unbalanced compensation control strategy was introduced, mainly consisting of a vibration signal processing module, an unbalanced mass position recognition module, and an output module. The vibration signal processing module calculated the vibration amplitude of the rotor system in the x and y directions based on the input signals from sensors. The unbalanced mass position recognition module used a variable step-size and angle algorithm to search for the position of the rotor's unbalanced mass based on the real-time vibration amplitude of the rotor, considering search efficiency and accuracy. The output module outputs the unbalanced compensation force based on the position of the rotor’s unbalanced mass and the expression of the unbalance compensation force, eliminating the influence of the rotor’s unbalanced force. Next, the unbalanced mass position search and vibration control were simulated under constant and variable speed conditions. Finally, an experimental platform was constructed on the electromagnetic bearing rotor system at speeds of 600 r/min, 1 200 r/min, and 1 800 r/min. The following three conclusions can be drawn. (1) The proposed unbalanced compensation control strategy can effectively suppress the rotor's unbalanced vibration. Experimental results show that rotor amplitude can be reduced by more than 60%. (2) A variable step-size and angle search algorithm is used to search for the equivalent unbalanced mass position of the rotor, which has the advantages of fast convergence and high control accuracy. (3) The unbalanced mass position is an inherent property of the rotor system and does not change with the speed. Therefore, the unbalanced compensation control method is insensitive to speed and is more suitable for frequent acceleration and deceleration scenarios.
陈亮亮, 郭至城, 靳晓光, 江弘钰, 祝长生. 基于变步长变角度搜索算法的电磁轴承转子系统不平衡补偿控制[J]. 电工技术学报, 2025, 40(18): 5959-5969.
Chen Liangliang, Guo Zhicheng, Jin Xiaoguang, Jiang Hongyu, Zhu Changsheng. Unbalanced Compensation Control for Active Bearing Rotor System Based on Variable Step and Angle Search Algorithm. Transactions of China Electrotechnical Society, 2025, 40(18): 5959-5969.
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