Vibration Torque Suppression for Magnetically Suspended Flywheel Using Improved Synchronous Rotating Frame Transformation

Abstract

Synchronous vibration, a common issue in active magnetic bearing (AMB) system, is mainly caused by mass imbalance of the rotor. It comes with high-power consumption and serious impact on the housing base, dramatically degrading the performance of AMB. Magnetically suspended flywheel (MSFW), which owns a flat rotor and consequently shows strong gyroscopic effects even at low operating speed, requires additional attention not only for suppressing the synchronous vibration but also for maintaining the overall stability faced with the coupled dynamics. In this work, in order to suppress the vibration torques in MSFW with significant gyroscopic effects, an improved synchronous rotating frame- (SRF-) based control method is proposed. The proposed method introduces the compensation phase for stability adjustment and aims at simultaneously suppressing the synchronous components in the coupled axes. Firstly, the vibration torque model of MSFW is established, and the baseline control strategy for suspension and gyroscopic effects restrain is derived. Then, the principle and implementation of the improved SRF-based vibration torque method are analyzed, which aims at suppressing the synchronous vibration torques through attenuating synchronous components in coil currents. Moreover, the stability of the overall closed-loop system is analyzed. Finally, the effectiveness of the proposed method is verified through simulation and experimental results.

Review on Active Vibration Control Method of Magnetically Suspended System

“…In 2015, Zheng et al applied the SRF method for motor drive control to the magnetic bearing system, and effectively suppressed the synchronous vibration in the active magnetic bearing system through the SRF method [28]. In 2019, Peng et al proposed an improved SRF method to effectively suppress synchronous vibration torque and ensure the stability of the system through phase compensation considering the serious gyroscope effect in magnetically suspended flywheel system [29]. Peng et al proposed an improved SRF method, which takes the synchronous vibration force as the input signal of controller instead of displacement signal.…”

Vibration Feedforward Compensation for Magnetically Suspended Control and Sensitive Gyroscope with Spherical Rotor

“…e force system consisting of dynamic reaction forces, inertia forces, and unbalance mass moments is simplified. If there is an unbalanced mass moment in the counterweight plane of the rotor part A, the mechanical equations of the five control channels can be obtained as follows based on the D′ Alembert principle [12,15]:…”

“…e synchronous vibration in a magnetically suspended system is caused by the mass unbalance which resulted from manufacture errors and raw material mass unevenness [12,13]. e vibration interferences can be classified into three cases, the centrifugal force, the unbalanced mass moment, and the composite interference derived from the former two cases.…”

Magnetic Circuit Design and Experiment of Novel Lorentz Magnetic Bearing with Double Air Gap

“…On the contrary, the output torque accuracy of the rotor of the magnetic bearing support has a high output torque accuracy as on the friction torque, mechanical vibration and viscous torque. The inertial actuators, whose rotors are supported by a magnetic bearing, include a magnetic reaction flywheel [3], a magnetic biased momentum wheel [4], a magnetic levitation control moment gyroscope [5], a magnetic levitation control, a sensitive gyroscope and so on [6]. The magnetic reaction flywheel and the biased momentum wheel are mainly used in small spacecraft attitude stability control as they have a high-precision output control torque by changing their rotor speed.…”