Digital Controller for a Gimballing Magnetic Bearing Reaction Wheel

2005 ◽  
Author(s):  
Bernd Gerlach ◽  
Markus Ehinger ◽  
Hans Knut Raue ◽  
René Seiler
Keyword(s):  
Magnetic Bearing ◽  
Digital Controller ◽  
Reaction Wheel

The Impact Analysis of Digital Controller Hardware Parameters of AMB on Control Precision

2012 ◽  
Vol 150 ◽  
pp. 111-115
Author(s):  
Yu Min Yang ◽  
Xi Ping Wang ◽  
Li Guo ◽  
Man Fan
Keyword(s):  
Digital Control ◽  
Impact Analysis ◽  
Control Model ◽  
Magnetic Bearing ◽  
Numerical Control ◽  
Digital Controller ◽  
Numerical Control System ◽  
Control Precision ◽  
The Impact ◽  
Control Accuracy

Digital control circuit for the hardware components, the impact of parameters on the control precision is analyzed. The digital control model is derived according to the requirements control of magnetic bearing system in this paper .Control accuracy and the prediction of control accuracy can be achieved by he theoretical estimates when numerical control system is given .For the future, it provides a simple and efficient method for estimating control accuracy of numerical controller.

Low-Cost Magnetic Bearing Reaction Wheel

1979 ◽  
Vol 12 (4) ◽  
pp. 229-236
Author(s):  
G. Innerhofer ◽  
J. Hammer
Keyword(s):  
Low Cost ◽  
Magnetic Bearing ◽  
Reaction Wheel

LOW NOISE FIVE-AXIS MAGNETIC BEARING REACTION WHEEL

2006 ◽  
Vol 39 (16) ◽  
pp. 572-577 ◽  
Author(s):  
Bernd Gerlach ◽  
Markus Ehinger René Seiler
Keyword(s):  
Magnetic Bearing ◽  
Low Noise ◽  
Reaction Wheel ◽  
Five Axis

Magnetic Bearing for Reaction Wheels in Space Applications

2005 ◽  
Author(s):  
T. R. Haridas ◽  
M. H. Ravichandran ◽  
P. V. Unnikrishnan ◽  
C. C. Joseph ◽  
Robert Devasahayam
Keyword(s):  
Attitude Control ◽  
Ball Bearing ◽  
Rate Capability ◽  
Magnetic Bearing ◽  
Friction Torque ◽  
Reaction Wheel ◽  
Space Applications ◽  
Imaging Application ◽  
Resolution Imaging ◽  
The Stability

Reaction wheels are used as actuators for attitude control of satellites. Ball bearing is being used in reaction wheel application since many decades. Even small variations in friction torque in ball bearings affects the pointing stability of the satellites used for high resolution imaging application. Also the bi-directional operation of reaction wheel requires frequent zero speed crossing. The stiction present in ball bearing wheels affects the stability during zero speed cross over. Magnetic Bearings have distinct advantages over conventional bearings, like zero friction (due to non-contact operation), no lubrication, long life, less power, etc. Absence of lubrication in magnetic bearing makes it compatible to harsh environments like vacuum. It provides smooth zero speed cross over due to negligible stiction, which is advantageous to achieve better pointing stability. The context of this paper benchmarks the design, simulation and test results of a two axes actively controlled magnetic bearing. The wheel is designed to have adequate slew rate capability to ensure non-contact operation during satellite maneuvers.

scholarly journals Launch lock system for reaction wheels

2021 ◽  
Author(s):  
M. Berlin ◽  
N. Goossens ◽  
H. W. Oelze ◽  
C. Braxmaier
Keyword(s):  
Additive Manufacturing ◽  
Magnetic Bearing ◽  
Reaction Wheel ◽  
Spring Mechanism

AbstractLaunch loads are critical forces to the payload. Many structures are not designed to survive these loads, thus, additional systems which absorb them are required. These launch lock mechanisms are available in different varieties. For a future magnetic bearing reaction wheel, two different principles of launch lock mechanism concepts were developed and tested. The first one is based on a spring mechanism, while the second uses electromagnetism to move the locking pins. A first testing with prototypes of both was conducted to evaluate the functionality. Subsequently improvements regarding reducing the mass and construction volume were incorporated in the design. In the course of this, additive manufacturing with PLA filament has been used to study possible applications for these mechanisms. The spring concept resulted to be more reliable than the electromagnetic one, but requires a damping mechanism. A usage of additive manufactured PLA components is a promising possibility for the production.

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