کنفرانس بین المللی ماشین و محرکه های الکتریکی

صفحه اصلی / The 5th International Conference on Electrical Machines and Drives

A Novel of topology for Active Magnetic Bearings used in High-Speed Permanent Magnet Motor

نویسندگان :

Pedram Pakravan¹

1- دانشگاه علم و صنعت ایران

کلمات کلیدی :

DC-DC power conversion،Energy storage،Pulse width modulated power topologies

چکیده :

In this study, a predictive functional control (PFC) approach is formulated for managing a Buck converter within an active magnetic bearing (AMB) framework. Compared to traditional bearings, AMBs deliver notable benefits such as minimized mechanical friction and improved positioning accuracy. A critical challenge arises during power interruptions: the suspension force vanishes, which can result in serious damage to both the rotor and auxiliary bearings. To address this reliability issue, a power failure compensation control (PFCC) scheme is introduced, implemented through a Buck converter. A distinctive hardware design enables the PFCC to interact seamlessly with motor drives that employ either pulse-amplitude modulation (PAM) or pulse-width modulation (PWM). When supply power is lost, the motor transitions into generator mode, producing a back electromotive force (back EMF) that is rectified via the inverter’s anti-parallel diodes. Concurrently, the Buck converter reconfigures the DC bus voltage into a suitable source for sustaining the AMB system. In scenarios where motor speed is too low to yield sufficient back EMF, the inverter switches are engaged to elevate the DC-link voltage by leveraging the motor windings. To further refine performance, a hybrid control method is proposed, integrating predictive functional control with a PID-based compensator, thereby enhancing the converter’s transient response. Experimental validation demonstrates that the suggested algorithm effectively safeguards the AMB system under power failure conditions.