BLDC MotorSunnySky V multirotor efficiency series · Ø43.6 mm
V4004 KV400
3904 400 KV drone motor from SunnySky for 4-6S: up to 1600 g thrust with a EOLO CN13*5 prop.
Manufacturer datasheet: SunnySky · V4004 KV400 ↗ (checked 2026-10-18)Maker profile & contacts →
Figures are copied from the maker’s published datasheet; curves are calculated from them. Confirm with the manufacturer before ordering. Not stated on the datasheet, estimated from it: rated point (estimated from KV, voltage and maximum current), inductance, rotor inertia, insulation class, IP rating.
Applications:Drones & UAV
How this motor is made
Full manufacturing overview: 70 mm Outer-rotor BLDC Motor →Ø43.6 mm frame; built with the same process as the 70 mm outer-rotor reference series.
- 1. Stator lamination stamping & interlocking
- 2. Stator powder coating
- 3. Outer-stator winding
- 4. Terminal soldering
- 5. Stator in-process test
- 6. Trickle impregnation (optional)
- 7. Stator mounting & Hall board
- 8. Rotor cup assembly
- 9. Magnetizing
- 10. Rotor balancing
- 11. Final assembly
- 12. End-of-line test
Export certification: Low-voltage motor without electronics
- Rated power
- 298 W
- Rated torque
- 0.417 N·m
- Rated speed
- 6,833 rpm
- Rated efficiency
- 75.7 %
Performance curves
Right axis:
SpeedEfficiency (right axis)
Calculated with the linear DC-motor model (constant 22.2 V supply, ignoring resistance rise with temperature).
Full specifications
General
- Motor type
- BLDC Motor
- Series
- SunnySky V multirotor efficiency series
- Frame / flange
- Ø43.6 mm
Rated Values
- Rated voltage
- 22.2 V
- Rated power
- 298 W
- Rated torque
- 0.417 N·m
- Rated speed
- 6,833 rpm
- Rated current
- 17.8 A
Performance
- Stall torque
- 1.83 N·m
- No-load speed
- 8,845 rpm
- Rated efficiency
- 75.7 %
- Peak efficiency
- 87.9 %
Electrical
- Torque constant Kt
- 0.0239 N·m/A
- Back-EMF constant Ke
- 2.5 V/krpm
- Resistance
- 0.288 Ω
- Inductance
- 0.432 mH
- No-load current
- 0.3 A
- Stall current
- 77.1 A
- Poles
- 24
- Electrical time constant
- 1.5 ms
- Mechanical time constant
- 0.505 ms
Mechanical
- Rotor inertia
- 10 g·cm²
- Body length
- 17 mm
- Shaft diameter
- 4 mm
- Weight
- 0.051 kg
- Power density
- 5,851 W/kg
- Protection
- IP40
Compatible drivers
All drivers →Drivers whose supply voltage covers this motor and whose continuous current is at least its rated current; drivers from the same maker first. Confirm Hall/encoder type and settings with the maker.
| Model | Maker | Motor type | Supply | Cont. / peak current | Feedback |
|---|---|---|---|---|---|
| BLDA0401A1 | Motion Control | BLDC | 12–55 V DC | 18 A | |
| PSDB-4031A1 | Motion Control | BLDC | 12–55 V DC | 18 A | |
| NU-BL5020-01 | Nuelectronics | BLDC | 18–50 V DC | 20 A / 25 A | Hall sensors, Sensorless, Open loop, Closed loop |
| NU-BL5020-02 | Nuelectronics | BLDC, Servo | 18–50 V DC | 20 A | Hall sensors, Incremental encoder |
| DCPC-09030-OPE | ZP Motors | BLDC, Servo | 18–90 V DC | 21 A / 42 A | Hall sensors, Incremental encoder |
| ZM-BL24Z30S | Zeming | BLDC | 18–32 V DC | 30 A | Hall sensors, Sensorless |
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