Brushless Motor Basics
Drone motors are brushless DC (BLDC) outrunner motors — the bell rotates around fixed windings. KV rating indicates RPM per volt (no-load). A 2400KV motor on 4S (14.8V) spins at ~35,520 RPM. Lower KV produces more torque for larger propellers; higher KV for small props and speed.
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Stator Size & Thrust
Stator dimensions (e.g., 2207 = 22mm width, 7mm height) determine torque. 14xx for 3", 22xx-23xx for 5", 28xx for 7", 31xx-41xx for heavy-lift. Larger stator = more thrust but more weight. Check manufacturer thrust tables for specific motor/prop/battery combinations.
Efficiency & Flight Time
Efficiency (grams per watt) determines flight time. A motor producing 8g/W at cruise is excellent; 5g/W is average. Efficiency peaks at 40-60% throttle — this is where you want to cruise. Oversized motors running at low throttle are less efficient than properly sized motors.
Build Quality Indicators
Look for: N52SH/N52UH high-temp magnets (resist demagnetization), NSK/NMB ball bearings, 7075-T6 aluminum bell, titanium hollow shaft (weight savings), silver-plated copper windings, and dynamic balancing. IP-rated motors for agricultural/maritime environments.
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