Drones | The complete flight dynamics
Lesics・6 minutes read
Drones use outrunner BLDC motors with propellers attached to produce lift force, achieving takeoff by surpassing drone weight and balancing rotor speed for hovering. To prevent spinning, drones have propellers rotating in opposite directions, with pitch and roll controlled by adjusting propeller speeds for varied lift forces to achieve forward flight.
Insights
- Drones utilize outrunner BLDC motors with propeller blades for lift, adjusting rotor speed for takeoff and hovering by balancing lift force and weight.
- Control of yaw, pitch, and roll in drones is achieved through varying propeller speeds, with opposite rotations to counter torque, enabling directional control and stability during flight.
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Recent questions
How do drones achieve lift?
Drones achieve lift by using BLDC motors with outrunner types, where propeller blades attached to the motor cover produce lift force due to the airfoil principle.
What is the purpose of rotating propellers in opposite directions on drones?
Rotating propellers in opposite directions on drones prevent body spinning due to reaction torque, with yaw motion controlled by varying speeds of diagonal propeller pairs.
How do drones maintain stability during flight?
Drones maintain stability during flight by adjusting propeller speeds to control pitch and roll motions, creating different lift forces that cause the drone to pitch or roll.
What is the key factor in achieving forward flight with drones?
Achieving forward flight with drones is primarily dependent on pitching down and balancing vertically to move forward while maintaining stability.
How do drones achieve hovering in the air?
Drones achieve hovering by balancing rotor speed with drone weight, ensuring that the collective lift force matches the drone's weight to stay stationary in the air.
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Summary
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"Drones: BLDC Motors, Lift Forces, Flight Control"
- Drones use BLDC motors with outrunner types, where propeller blades attached to the motor cover produce lift force due to the airfoil principle.
- Takeoff involves increasing rotor speed until collective lift force surpasses drone weight, leading to climbing; hovering is achieved by balancing rotor speed with drone weight.
- Propellers on drones rotate in opposite directions to prevent body spinning due to reaction torque, with yaw motion controlled by varying speeds of diagonal propeller pairs.
- Pitch and roll motions are controlled by adjusting propeller speeds to create different lift forces, with the net torque causing the drone to pitch or roll; forward flight is achieved by pitching down and balancing vertically.
