March 19, 2019


A set of three orthogonally aligned torque rods wired up so they can generate a magnetic dipole field of either sign (i.e. flip the North and South. Magnetic Torquers. These devices interact with the Earth’s magnetic field and create control torque, which can be adjusted to the required value. Combined with. In this work the issue of acceleration disturbances onboard of GRACE due to magnetic torquers is investigated and discussed. Each of the.

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I have a location of a satellite in LEO, and the magnetic field vector for said satellite. Basically, most magnetorquers function something like bar magnets that can be dialed to select how powerful, and what direction, they pull in.

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Email Required, but never magnetoc. A magnetorquer or magnetic torquer also known as torque rod is a satellite system for attitude controldetumbling, and torwuers built from electromagnetic coils. The dipole interacts with the magnetic field generating a torque whose expression is:. Home Questions Tags Users Unanswered. That field is controlled by switching current flow through the coils on or off, usually under computerized feedback control.

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Magnetic Torquer VMT-35

A broader disadvantage is the dependence on Earth’s magnetic field strength, making this approach unsuitable for deep space torquefs, and also more suitable for low Earth orbits as opposed to higher ones like the geosynchronous. Essentially, what happens when you turn on the magnetorquer is that there is a torque applied to move the spacecraft to line up with the magnetic field vector. We could have started at this step by choosing the principle reference frame to start, but many seem comforted by starting with the full EOM.

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Very small satellites may use permanent magnets instead of coils. The magnetorquer creates a magnetic dipole that interfaces with an ambient magnetic field, usually Earth’sso that the counter-forces produced provide useful torque.

Typically three coils are used, although reduced configurations of two or even one magnet can suffice where full attitude control is not needed or external forces like asymmetric drag allow underactuated control. Mathematically, the torque is provided in the direction of: Sign up or log in Sign up using Google.

Any spinning satellite made of a conductive material will lose rotational momentum in Earth’s magnetic field due to generation of eddy currents in its body and the corresponding braking force proportional to its spin rate. Like a compass needle, the magnet will line up with the north pole of the magnet lining up to the south magnetic field.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Unlike thrustersthey do not require expendable propellant either, so they could in theory work indefinitely as long as sufficient power is available to match the resistive load of the coils. The construction of a magnetorquer is based on the realization of a coil with a defined area and number of turns according to the required performances.

artificial satellite – What is the math behind Magnetorquers? – Space Exploration Stack Exchange

Views Read Edit View history. It is also impossible to control attitude in all three axes even if the full three coils are used, because the torque can be generated only perpendicular to the Earth’s magnetic field vector. A further advantage over momentum wheels and control moment gyroscopes is the absence of moving parts and therefore significantly higher reliability.


This means that the magnetorquer will have to be continuously operated, and at a power level which is enough to counter the resistive forces present. Subsequently, the torques provided are very limited and only serve to accelerate or decelerate the change in a spacecraft’s attitude by minute amounts.

Magnetorquers are lightweight, reliable, and energy-efficient. All articles with unsourced statements Articles with unsourced statements from November Articles with unsourced statements from December Specifically, let’s assume the following hypothetical situation: Math is very frequently helpful in spaceflight.

This is not always possible within the energy constraints of the vessel. As long as current is passing through the coils and the spacecraft has not yet been stabilized in a fixed orientation with respect to the external field, the craft’s spinning will continue.

Mathematically, the torque is provided in the direction of:. The full analysis will be easier to apply by measuring one magnetorquer at a time, but I’m going to assume that their torque lines up with the rotational vectors reasonably well, allowing for all of them to be handled. Furthermore, one must consider that there are in effect only 2 axis of rotation. Post as a guest Name. Torque rods rely on the change in direction of the Earth’s magnetic field, which is especially problematic in equatorial orbits because to first order the field has a constant inertial direction.

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Spacecraft attitude control Spacecraft propulsion Spacecraft components.