Fractional-order sliding mode control for a bearingless induction motor based on improved load torque observer |
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| Authors: | Zebin Yang Qifeng Ding Xiaodong Sun Huimin Zhu Chengling Lu |
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| Institution: | 1. Automotive Engineering Research Institute, Jiangsu University, Zhenjiang 212013, China;2. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China;1. College of Science, Hebei Agricultural University, Baoding 071001, China;2. School of Science, Nanjing University of Science and Technology, Nanjing 210094, China;3. School of Information Technology, Jiangxi University of Finance and Economics, Nanchang 330013, China;4. School of Mathematics and Physics, Anhui Polytechnic University, Wuhu 241000, China;1. Graduate School of Mechanical and Aerospace Engineering, Gyeongsang National University, 501 Jinjudaero, Jinju 52828, Republic of Korea;2. Department of Electrical Engineering, Hanyang University, 222 Wangsimniro, Seoul 04763, Republic of Korea;1. Building 35B, Harbin Engineering University, Harbin, China;2. Ingkarni Wardli Building, North Terrace campus, The University of Adelaide, Adelaide, Australia;3. Building 61, Harbin Engineering University, Harbin, China;1. Department of Electrical Engineering, University of Chile, Av. Tupper 2007, Santiago, Chile;2. Departmento de Electricidad, Facultad de Ingeniería, Universidad Teconológica Metropolitana, Av. José Pedro Alessandri 1242, Santiago, Chile;3. Facultad de Ingeniería y Arquitectura, Universidad Central de Chile, Toesca 1783, Santiago, Chile;4. Advanced Mining Technology Center, University of Chile, Av. Tupper 2007, Santiago, Chile;5. Department of Industrial Technologies, University of Santiago of Chile, Av. El Belloto 3735, Santiago, Chile;6. Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Bellavista 7, Santiago 8420524, Chile;7. Escuela de Negocios y Tecnología, Universidad Gabriela Mistral, Av. Ricardo Lyon 1177, Providencia, Santiago, Chile;1. School of Control Science and Engineering, Dalian University of Technology, Dalian 116023, China;2. State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110004, China |
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| Abstract: | In order to improve the anti-disturbance performance of a bearingless induction motor (BIM) control system, a fractional-order sliding mode control (FOSMC) strategy based on improved load torque observer is proposed on the basis of the sliding mode speed regulation system. Using the information memory and genetic characteristics of the fractional calculus operator, the fractional integral term of the speed error is introduced in the design of the traditional sliding surface, which reduces the influence of disturbance on the speed regulation system. The fractional-order sliding mode control law is derived based on the BIM mathematical model, and the stability of the control law is proved by Lyapunov theorem. An improved observer is constructed based on the BIM state equations, and the real-time observed load torque is introduced into the fractional-order sliding mode controller. To improve the observer's convergence speed, the proportional integral form is used to replace the integral form in the traditional reduced order load observer. And the state error feedback coefficients of the improved load observer are calculated. Both simulation and experimental results verified the effectiveness of the proposed control strategy. |
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