The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Comparing with the indirect drive gimbal servo system of single gimbal control moment gyroscope (SGCMG), direct drive gimbal servo system based on permanent magnet synchronous motor (PMSM) can achieve higher precision and faster response. However, the difficulty of PMSM controller design increases, because PMSM has to endure larger multi-source and multi-band disturbances due to the lack of a decelerator...
For high agility and high precision attitude maneuver of remote sensing satellites, the Control Moment Gyroscope (CMG) is expected to supply the torque more accurately, which means the disturbance torque on its gimbal axis should be minimized to reduce the pulsation of the gimbal speed. In this paper, the torque generated by the wheel imbalance is analyzed, and the gimbal system model is built. To...
Single gimbal control moment gyroscope (SGCMG) is used as the actuator of attitude control system for modern satellites. High precision control of the SGCMG gimbal servo system is difficult to achieve because of the existing multi-source and strong coupling disturbances. In this paper, multi-source disturbances are modeling, meanwhile, a high precision controller is designed, including a variable...
Deficient capability of high frequency disturbance torque attenuation restricts further improvements on the speed control performance of single gimbal control moment gyro (SGCMG) gimbal servo system. In this paper, a variable structure controller (VSC) combined with repetitive controller (RC) is proposed. Utilizing the characteristics of invariance and fast response of VSC and the characteristics...
Ultra-low speed control strategy is a difficult problem in the single gimbal control moment gyro (SGCMG) gimbal servo system. Speed detection resolution and disturbance torque attenuation are two major factors that restrict further improvements on the ultra-low speed control performance. In this paper, a novel ultra-low speed control strategy is proposed, including a multi-cycle backward difference...
A new reliable sensorless startup strategy of brushless DC (BLDC) motor is proposed to prevent long time integration commutation error specialized for large inertia load and to adapt large disturbance torque fluctuation. It includes four segments: orientation segment, I/f startup segment, observer startup segment and back EMF startup segment. Experimental results show that the proposed method could...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.