Servo Types for UAVs
Servos provide precise angular control for fixed-wing control surfaces, camera gimbal tilt, payload release, and VTOL tilt mechanisms. Digital servos offer faster response and higher holding torque than analog. Brushless servos provide longest life and highest precision for gimbals. Coreless motors offer smooth operation for camera control.
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Key Specifications
Torque (kg·cm): determines load capacity — 9g micro servos (1-2 kg·cm) for small planes; standard 25g (3-5 kg·cm); giant scale (20+ kg·cm). Speed (sec/60°): 0.05-0.10 for 3D aerobatics; 0.15-0.20 for sport. Voltage: 4.8V (BEC) or 7.4V (2S LiHV) for high-voltage servos.
Control Protocols
PWM (50Hz, 1-2ms pulse) is universal but slow. SBUS/CRSF provides faster digital control for multiple servos. CAN/UAVCAN servos offer telemetry and position feedback for enterprise systems. For VTOL tilt mechanisms, use serial-controlled servos with position feedback.
Mechanical Considerations
Gear material: metal gears for high torque and durability; Karbonite for corrosion resistance; plastic for light loads. Bearing type: dual ball bearings for long life; bushing for low-cost. Waterproof (IP67) servos for seaplanes and agricultural drones. Always use servo arms rated for the torque.
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