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How are Magnetic Encoders used in Drones?

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Magnetic encoders are sensors that convert the angular position or motion of a magnetic field into an electrical signal. These encoders are used to determine the position and speed of the drone's components, such as motors or gimbals.

The main components include:

  • Magnet: Usually, a permanent magnet is attached to a rotating part. A rotary magnetic scale has a magnetic surface where the magnetic pattern is encoded.
  • Sensor: A Hall effect sensor or a magneto-resistive sensor that detects changes in the magnetic field as the magnet moves. 

 

Applications in Drones

  • Motor Control: Magnetic encoders are commonly used in the brushless motors of drones to provide precise feedback on the rotor position. This helps accurately control the motor's speed and torque, which is crucial for stable flight and maneuverability.
  • Gimbal Stabilization: In-camera drones, magnetic encoders can stabilize the camera in gimbal systems. They provide precise feedback on the gimbal's position, allowing for smooth and stable camera movement even when the drone is in motion.
  • Navigation and Positioning: For advanced navigation systems, magnetic scales can be part of the inertial measurement units (IMUs) or other sensor systems that track the drone's position and orientation in space. This is essential for high-precision tasks, such as surveying, mapping, or industrial inspections.

 

More about the working principle and all advantages please find here.