Fractional Order Active Disturbance Rejection Control for Canned Motor Conical Active Magnetic Bearing-Supported Pumps

• Published in: Inventions (Basel) Vol. 8; no. 1; p. 15
• Main Authors: Nguyen, Danh Huy, Ta, The Tai, Vu, Le Minh, Dang, Van Trong, Nguyen, Danh Giang, Le, Duc Thinh, Nguyen, Duy Dinh, Nguyen, Tung Lam
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-01-2023
• Subjects: Active control; active disturbance reject control; Actuators; canned motor pump; Closed loops; conical active magnetic bearing; Control systems; Controllers; Degrees of freedom; Design; Disturbances; extended state observer; Feedback control; fractional calculus; Geometry; Innovations; Magnetic bearings; Properties; Proportional derivative; Proportional integral derivative; Pumping machinery; Rejection; Rotating shafts; Rotors; State observers; Systems stability; Thrust bearings; Vietnam
• ISSN: 2411-5134; 2411-5134
• DOI: 10.3390/inventions8010015

Active magnetic bearings (AMBs) are electromagnetic mechanism systems in which non-contact bearings support a rotating shaft using attractive forces generated by electromagnets through closed-loop control. For complete support of a five degree of freedom (DOF) rotor system, most AMB structures include two radial actuators and one for the axial direction. Conical active magnetic bearings (CAMBs) is one of the development directions of conventional magnetic bearings in which the requirement of the axial bearing can be eliminated. In this paper, we propose a structure with a CAMB integrated into a canned motor pump to eliminate the need for mechanical bearings and shaft seals. However, this system necessitates a more complicated control strategy due to a significant coupling effect between rotor motion and hydrodynamic disturbances. This paper presents a fractional order active disturbance rejection control (FOADRC) including a fractional order extend state observer (FOESO) and a proportional derivative controller (PD) to track and reject lumped disturbances actively. The proposed controller achieves better performance than the integer-type ADRC and traditional PID controller. The control performance of the proposed FOADRC is illustrated in terms of very good disturbance rejection capability that is demonstrated through MATLAB/Simulink simulation results.