Mohd Suhadis, Nurulasikin and Varatharajoo, Renuganth
(2012)
A study of coupled magnetic fields for an optimum
torque generation.
International Journal of Multiphysics, 6 (1).
pp. 73-88.
ISSN 1750-9548
Abstract
Magnetic torquers are specifically designed to generate a magnetic field
onboard the satellites for their attitude control. A control torque is generated
when the magnetic fields generated by the magnetic torquers couple with
the geomagnetic fields, whereby the vector of the generated torque is
perpendicular to both the magnetic fields. In this paper, two control algorithms
for a momentum bias satellite implementing two and three magnetic torquers
onboard have been developed. The structured algorithms are for an
optimum torque generation and eventually controlling the satellite attitudes
(roll/yaw) and nutation using a proportional (P) controller as well as managing
the excess angular momentum via a proportional-integral (PI) controller. The
developed control algorithms were tested using the complex and simplified
geomagnetic field models for a LEO satellite mission in a nominal attitude
operation. Their attitude torque generation performances were compared
and it is found that the optimum torques can be generated by both the
developed control algorithms. However, the system with three magnetic
torquers provides a better torque generation compartment and
consequently gives a better attitude performance up to 0.5 deg.
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