Design of a control moment gyroscope with outer rotor BLDC motor

Download

index.pdf

Date

2019

Author

İnce, Berk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

567
views

258
downloads

The aim of this thesis is to design a control moment gyroscope (CMG) with outer rotor BLDC motor for medium size satellites. CMG is a device that provides high output torque to the satellite in order to maneuvering satellites rapidly. CMG is the most efficient actuator in terms of output torque capacity when it is compared with other type actuators such as the reaction wheel. The first step of the designing CMG is to determine CMG design specifications. The mass and volume specifications of the designed CMG are selected to be the same as the previous satellite actuator (reaction wheel) that was used in the previous satellite program Satellite maneuvering calculations on x and y axes are covered for four different maneuvering cases to determine the required CMG output torque capacity. Operating temperature, operating voltage, and maximum gimbal angle excursion are other specifications to be considered in the design process of the CMG in this thesis. In addition, the effect of the four different maximum gimbal angle excursions on the CMG design is investigated. The designed CMG consists of the wheel, BLDC motor, and gimbal structure. The wheel that provides the required inertia is designed to generate CMG output torque. During the wheel design, mass and volume reduction calculations are done and yield stress and safety factor constraints of the wheel are considered. To drive the wheel of CMG, the outer rotor BLDC motors are designed. The designed motor satisfies electrical loading and magnetic loading constraints and the mass of the motor is selected as low as possible. Step motor for gimbal angle control, step motor driver and gear system are selected for gimbal structure to overcome the required torque of the gimbal system. The thermal simulation model of the designed CMG is created to analyze thermal performance of the CMG. In the end, the design results of CMG are shown. In this thesis, it is shown that although mass and volume are the same for these two actuators, the output torque capacity of the designed CMG is higher than the previous reaction wheel.

Subject Keywords

Artificial satellites., Keywords: Control Moment Gyroscope (CMG), Spacecraft Thermal Control Systems, Outer Rotor Permanent Magnet BLDC Motor Design, CMG Output Torque Calculations, Flywheel Design

URI

http://etd.lib.metu.edu.tr/upload/12624693/index.pdf
https://hdl.handle.net/11511/44505

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Choice of Pole Number of Two-Rotor Axial-Flux PM Motor for Control Moment Gyroscope Özlü Ertan, Hatice Gülçin (2011-09-10) Modern low earth orbit satellites use control moment gyroscopes (CMG) for maneuvering. GMC's generally use a brushless DC motor to run an inertial wheel at about 10000 rpm. In this paper axial-flux BLDC motor is considered for this task with a view to design a low volume, low weight CMC. Various axial-flux (AF) motor topologies are possible. However, two-rotor AF topology is found to be more advantageous. The specifications of an existing CMG design, based on a commercial BLDC motor are taken as reference. ...
Comparison of Outer Rotor Radial Flux and Axial Flux PM Motors for CMG Application Ertan, Hulusi Bülent (2014-09-05) Control moment gyroscopes (CMG) are used in modern satellite applications for attitude control of satellites. The volume and mass of the instruments is very important in such applications. In this context, integrating the mass of the CMG, on the stator of the motor, promises to save space and mass. Radial-flux outer-rotor motor is a promising configuration in that respect. In this paper, using such a PM motor is considered for control moment gyroscope applications. The design of the motor must be made such ...
Evaluation of a 6 pole axial flux PM motor for Control Moment Gyroscope Application Zeinali, Raza; Ertan, Hulusi Bülent (2015-09-04) In a previous study a compact Control Moment Gyroscope (GMC) design, based on a 6-pole, axial flux (AF) motor was presented. The GMC design in that proposal was based on analytical expressions and naturally 3-D structure of the AF motor could not be fully taken into account. In this paper the designed motor is simulated using 3-D FEM solutions. The parameters of the design such as electric loading and current loading as well as the performance of the design such as phase current and the torque produced at 1...
Design of a GaN Based Integrated Modular Motor Drive Uğur, Mesut; Keysan, Ozan (2018-10-25) In this study, design procedure of an Integrated Modular Motor Drive (IMMD) is presented focusing on high power density. The design is based on a permanent magnet synchronous motor (PMSM) and GaN FETs. Fractional slot concentrated windings are used on the stator. Slot/pole combination and winding configuration is selected based on having low cogging torque and high winding factor. An extended motor drive inverter topology is proposed where 2-level voltage source inverters are connected both in series and pa...
Active Vibration Control of a Smart Fin Ülker, Fatma Demet; Nalbantoğlu, Volkan; Yong, Chen; Davıd, Zımcık; Yaman, Yavuz (2009-05-04) This paper summarizes the design and wind tunnel experimental verifications of robust H∞ controllers for active vibration suppression of a dynamically scaled F-18 vertical smart fin. The smart fin consists of a cantilevered aluminium plate structure with surface bonded piezoelectric (Lead-Zirconate-Titanete, PZT) patches, Integrated Circuit Piezoelectric (ICP) type accelerometers and strain gauges. For H∞ controller design, the transfer function of the fin was first estimated outside the wind tunnel. Then, ...

Citation Formats

B. İnce, “Design of a control moment gyroscope with outer rotor BLDC motor,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering., Middle East Technical University, 2019.