300KV outrunner brushless DC motor with IP28 waterproof rating. Max power 400W, input 11-22V DC (3-6S batteries). This waterproof BLDC motor with ESC is ideal for direct-drive propellers, efoil electric surfboards, skateboards, and longboards.
Specification
| Model |
BLDC-F4125 |
| Max Power |
400W (0.5 hp) |
| Rotation Speed KV (RPM/V) |
300KV |
| Max Input Voltage* |
DC 11-22V |
| Waterproof Grade |
IP28 |
| Motor Length |
50mm |
| Motor Diameter |
46mm |
| Shaft Diameter |
4.85mm |
| Mounting Distance |
28mm |
| Prop Mounting Distance |
25mm |
| Weight |
310g |
Note: The motor is powered by 3-6S batteries, S is the number of batteries, voltage of every battery is 3.7V DC.
ESC (Electronic Speed Controller) Selection for Waterproof BLDC Motor
- A BLDC motor can be used with an ESC as long as its speed does not exceed the ESC’s limit.
- BLDC motor speed = Battery Voltage × KV value;
Stator speed = Battery Voltage × KV value × Pole Pairs.
- The maximum speed limit of the V4 series ESC is 60,000 ERPM.
The maximum speed limit of the V6 series ESC is 150,000 ERPM.
- If a BLDC motor’s maximum speed surpasses the ESC’s limit, it is possible to match them by lowering the motor’s operating voltage. However, this is not recommended, as it prevents the motor from functioning as a true brushless DC motor.
ESC (Electronic Speed Controller) Specification
| Model |
Current Value |
Number of Batteries (Input Voltage) |
| FSESC 4.12 |
Continuous 50A, peak 240A |
3S-12S (8V-60V) |
| FSESC 4.20 |
Continuous 50A, peak 240A |
3S-12S (8V-60V) |
| VESC 6.6 mini dual drive |
1-channel 100A continuous, 2-channel 200A continuous |
3S-12S (8V-60V) |
| 1-channel peak 400A, 2-channel total peak 800A |
| VESC6.6 integrated switch dual drive version |
1-channel 100A continuous, 2-channel 200A continuous |
3S-12S (8V-60V) |
| 1-channel peak 400A, 2-channel total peak 800A |
| FSESC6.7 VESC6.6 single drive integration* |
Continuous 70A, peak 200A |
3S-12S (8V-60V) |
| VESC4 dual drive integration |
50A continuous 1-channel, peak 100A 2-channel, peak 300A 2-channel |
3S-12S (8V-60V) |
| ODESC3.6 single drive/dual drive |
50A continuous 1-channel, peak 120A 1-channel |
3S-12S (8V-60V) |
| VESC6 dual drive |
1-channel 100A continuous, 2-channel 200A continuous |
3S-12S (8V-60V) |
| 1-channel peak 400A, 2-channel total peak 800A |
| Single drive V6 75200 |
Continuous 200A |
3S-12S (8V-60V) |
| Single drive VESC6 waterproof version |
Continuous 60A, peak 150A |
3S-12S (8V-60V) |
Note: The ESC model with * is the recommended controller for this page of motor, if you need other ESC models, please contact us.
Details
Dimension (Unit: mm)
Applications
Q: How to maintain for a waterproof brushless DC motor?
A: To maintain a waterproof brushless DC motor, regularly clean its exterior to remove dust or debris, check that all electrical connections and waterproof seals are intact, avoid overloading the BLDC motor, and monitor its operating temperature to ensure long-term reliable performance.
