reaktiopyöriä
Reaktiopyöriä, also known as reaction wheels, are a type of flywheel used for attitude control of spacecraft and satellites. They are a form of angular momentum control device that operates by conserving angular momentum. A reaction wheel consists of a motor connected to a flywheel. When the motor spins the flywheel, a torque is exerted on the spacecraft in the opposite direction. This torque can be used to change the orientation of the spacecraft.
The principle behind reaction wheels is Newton's third law of motion, which states that for every action,
Reaction wheels are particularly useful for making small, precise adjustments to a spacecraft's attitude over long