High-quality IP68 waterproof brushless DC motor for sale, rated at 3.7kW, compatible with 6–20S batteries, 130KV speed rating. This sensorless waterproof BLDC motor is ideal for underwater thrusters, electric surfboards, and boats.
Specification
| Model |
BLDC-65121 |
| Max Power |
3700W |
| Continuous Rated Power |
2000W |
| Rotation Speed KV (RPM/V) |
130KV |
| Input Voltage Range |
6-20S |
| Max. Torque |
5.5 Nm |
| Max. Current |
100A |
| Insulation Voltage |
AC500V/ 1MA/ 3S |
| Connection Plug |
8mm plug |
| Internal Structure |
18N/ 6P |
| Axis |
∅12*M8 |
| Motor Dimension |
65*121mm |
| Waterproof Grade |
IP68 |
| Motor Wire |
8 AWG x 500mm |
| Weight |
1.62kg |
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 |
| FSESC6.6 VESC6.6 single drive integration |
Continuous 60A, peak 150A |
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: What is a sensorless BLDC motor?
A: A sensorless BLDC (Brushless DC) motor is a type of electric BLDC motor that operates without physical sensors to detect rotor position. Instead, it estimates the rotor’s position using the back electromotive force (back-EMF) generated in the stator windings, allowing the motor controller to efficiently commutate the motor phases. Sensorless BLDC motors are simpler, more robust, and often used in applications where reliability and low maintenance are important, such as electric scooters, drones, and waterproof motors.
