Product overview
The YAHREE IP4006 KV390 is a brushless propulsion motor for multirotor UAVs used in aerial photography, surveying and mapping. Its ultra-thin construction uses high-strength aluminum, hand-wound thick copper wire and dedicated ventilation and cooling features. The motor measures 44.4 ± 0.1 mm in diameter and 21 ± 0.3 mm in length, and weighs 70 ± 5 g. Its electrical configuration combines an 18N24P slot-and-pole arrangement with a motor KV rating of 390 ± 5% RPM/V.
The recommended integration pairs a 6S LiPo battery with a 6S/80 A ESC and a 1552 propeller. Mounting accommodates YHR carbon-fiber propellers and other propellers with M6 holes. The motor includes imported bearings, with replacement recommended after 60 hours even if they appear satisfactory. At 24 V, maximum continuous current and power are 21 A/504 W; the 27.5 A/660 W maximum is limited to 15 seconds. Thrust depends on propeller, voltage and test conditions. OEM/ODM customization covers KV, appearance and color.
Specifications
| Specification | Value & conditions |
|---|---|
| Motor diameter | 44.4 ± 0.1 mm |
| Motor length | 21 ± 0.3 mm |
| Slots and poles | 18N24P |
| Motor KV | 390 ± 5% RPM/V |
| No-load current | 0.8 A maximumAt 20 V. |
| Phase-to-phase resistance | 166 ± 8% mΩAt 25°C. |
| Maximum continuous current and power | 21 A / 504 WAt 24 V. |
| Temperature | 85°CAt maximum continuous current. |
| Maximum current and power | 27.5 A / 660 WAt 24 V; maximum duration 15 seconds. |
| Motor weight | 70 ± 5 g |
| Recommended LiPo battery | 6S |
| Recommended ESC | 6S / 80 A |
| Recommended propeller | 1552 |
| Magnet operating temperature limits | 150°C maximum; 120°C maximum recommended |
| Torque constant, Kt | 276.75 g·cm/A |
| Motor constant, Cn | 0.63 rpm/g·cm |
| Performance at 35% throttle | Thrust 760 g; current 3.3 A; power 79.2 W; efficiency 9.601552 propeller; 24 V; 35% throttle. |
| Performance at 40% throttle | Thrust 870 g; current 4 A; power 96 W; efficiency 9.061552 propeller; 24 V; 40% throttle. |
| Performance at 45% throttle | Thrust 950 g; current 4.7 A; power 112.8 W; efficiency 8.421552 propeller; 24 V; 45% throttle. |
| Performance at 50% throttle | Thrust 1060 g; current 5.4 A; power 129.6 W; efficiency 8.181552 propeller; 24 V; 50% throttle. |
| Performance at 55% throttle | Thrust 1170 g; current 6.2 A; power 148.8 W; efficiency 7.861552 propeller; 24 V; 55% throttle. |
| Performance at 60% throttle | Thrust 1220 g; current 7 A; power 168 W; efficiency 7.261552 propeller; 24 V; 60% throttle. |
| Performance at 65% throttle | Thrust 1320 g; current 7.8 A; power 187.2 W; efficiency 7.051552 propeller; 24 V; 65% throttle. |
| Performance at 70% throttle | Thrust 1420 g; current 8.8 A; power 211.2 W; efficiency 6.721552 propeller; 24 V; 70% throttle. |
| Construction | Ultra-thin design using high-strength aluminum |
| Windings and cooling | Hand-wound thick copper wire with a dedicated ventilation and cooling design |
| Propeller mounting compatibility | YHR carbon-fiber propellers and other propellers with M6 holes |
| Included bearings | Motor supplied with imported bearings |
| Recommended bearing replacement interval | 60 hoursAfter 60 hours of use, including when bearings appear to be in good condition. |
| Customization options | Custom KV, appearance and colorFor OEM/ODM projects. |
