When drones are used outdoors for photography, inspection, or agricultural spraying, they often encounter rain, mist, or humid environments. In such situations, drone motors may get wet. If not treated promptly, water entering the motor can cause short circuits, burning, or damage to the control system. Therefore, knowing how to quickly handle a wet motor and implement waterproofing measures is essential for protecting your drone and prolonging its lifespan.
Common Causes of Motor Water Ingress
Drone motors typically get wet due to the following reasons:
Rain or splashes: During flight, raindrops or splashing water from surfaces may enter the motor.
Improper cleaning: Using water to clean the drone without proper protection can allow water to reach the motor.
High humidity: Flying in fog, dew, or high-humidity environments can cause moisture to gradually seep into the motor.
Understanding these causes helps in taking targeted preventive measures during operation and maintenance.
Quick Handling Steps for a Wet Motor
Power Off Immediately
Once you notice the motor is wet, the first step is to turn off the power to prevent short circuits or motor damage.
Disassemble the Motor
Remove the motor from the drone arm or chassis to prevent water from spreading to the ESC or flight controller.
Absorb Surface Water
Use a dry, lint-free cloth or paper towel to gently remove water from the motor surface. Avoid excessive force to prevent damaging the motor coils or bearings.
Air Dry or Low-Temperature Dry
Place the motor in a well-ventilated area to air dry, or use a low-temperature dryer (around 40°C) to remove internal moisture. Do not use high heat, as it may damage insulation materials.
Check and Test
After the motor is completely dry, test it under no-load conditions without connecting it to the flight controller. Ensure there is no abnormal noise or overheating before reinstalling it on the drone.
Waterproofing Measures and Daily Protection
Choose High IP-Rated Motors
Motors with IPX4 or higher ratings can safely operate in light rain or humid environments.
Apply Waterproof Coating
Applying specialized waterproof oils or insulating coatings on motor housings and terminals can reduce water ingress.
Use Waterproof Sleeves or Seals
Install protective sleeves or sealing rings on motor connectors, power lines, and ESC interfaces to prevent moisture from entering.
Check Weather Conditions Before Flying
Avoid flying in rain, fog, or high-humidity conditions to minimize the risk of motor water exposure.
Proper Cleaning and Storage
After cleaning, ensure the drone is fully dried and stored in a dry, ventilated environment to prevent long-term moisture damage.
Conclusion
While drone motors getting wet is common, most issues can be effectively resolved with the correct handling and preventive measures. Quick power-off, disassembly, and low-temperature drying are essential steps for treating wet motors, while choosing waterproof motors, applying protective coatings, and using sealing measures help prevent water ingress. By maintaining your drone properly and taking preventive action, you can ensure safe operation, extend motor and overall drone life, and provide reliable performance for daily flights.