Brushless Motors
Ideal Power Source for Underwater Scooters & Watercraft
Outer Rotor Brushless Submersible Motor
Industrial three-phase sensorless fully sealed power unit custom-engineered for underwater scooters, ROVs, and subsea propulsion matrices.
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Engineering Advantages
Designed for persistent operation under heavy load in corrosive marine environments.
Outer Rotor Architecture
Sensorless three-phase outer rotor configuration provides extreme power density, superior low-end torque matrix, and highly optimized power consumption.
Factory Sealed Waterproofing
Features an integrated full IP waterproof cylinder layout. 100% pre-sealed and validated at the factory for zero-leak deployment in both fresh and salt water.
Hydrodynamic Efficiency
Integrated anti-corrosion matte black metal shell and streamlined propeller engineering ensure minimal fluid resistance and maximized thrust output.
Technical Specifications
Standard data logs for OBLM4990 Series system integration parameters.
| Parameter Item | Technical Data Value |
|---|---|
| Model Number | OBLM4990 Series (3-Phase Sensorless BLDC) |
| Rated Operating Voltage | 27.5 VDC |
| KV Rating | 290 KV |
| No-load Rated Speed | 7960 ±10% RPM |
| Maximum Load Current | 36 A |
| Peak Output Power | 800 W |
| Application Matrix | Underwater Scooters, Robot ROVs, Diving Thrusters |
Industrial Application Scenarios
Flexible engineering interface designed for multi-platform underwater assembly.
Commercial & Consumer Vehicles
Perfect matching core power unit for underwater scooters, snorkeling thrusters, and small consumer diving auxiliary craft.
Marine Robotics (ROV)
High-efficiency propulsion module for mini underwater observation robots, inspection ROVs, and lightweight submersibles.
Aquaculture & Subsea Systems
Ideal for underwater flow pushing machinery, marine detection arrays, and auxiliary marine thrusters.
ESC & Wiring Integration
- Sensorless Configuration: 3 thick phase power wires. Does not require Hall signal line arrays.
- ESC Requirement: Sensorless BLDC controller with continuous current rating ≥ 40A, input range 24V – 28VDC.
- Direction Rotation: Swap any two of the three phase wire connections to instantly reverse thrust direction.
- Battery Cell Spec: 27.5V Lithium pack recommended with continuous discharge rate ≥ 40A to prevent full-load voltage drops.
Critical Operating Safety
- No Dry Running: Strictly prohibited to run out of water. Motor relies entirely on water circulation for heat dissipation; dry running causes instant burnout.
- Duty Cycle Management: Continuous full-load peak output must be restricted within 15 minutes. Allow 5 minutes cool down.
- Depth Threshold: Factory structural housing rated for shallow commercial diving up to 50 meters. Contact sales for deeper custom depth matrix.
- No Self-Disassembly: Sealed cylinder structure is pre-compressed. Unauthorized opening breaches water-tight integrity and voids warranty.
Industrial Fault Diagnosis
Field troubleshooting Matrix for technical crews and integration engineers.
| Fault Phenomenon | Root Cause Analysis | Recommended Solution |
|---|---|---|
| Motor no rotation after power-on | 1. Broken wire connection 2. ESC parameter mismatch 3. Battery voltage undervoltage |
Inspect 3-phase line layout; re-calibrate sensorless ESC; swap with fully charged 27.5V battery pack. |
| Severe vibration & high noise pitch | 1. Foreign debris in propeller 2. Deformed blade structure 3. Loose propeller locking snap ring |
Clear sand, seaweed or debris; replace damaged propeller blades immediately; re-lock anti-loosing snap rings. |
| Thrust attenuation / Low RPM drops | 1. Low battery discharge rate 2. Poor terminal wire contact 3. Thermal coil attenuation |
Upgrade to high-rate discharge lithium packs; re-solder loose phase wires; power down system for 5 min cooling cycle. |
Request Engineering Support & Quote
Need custom ESC parameter debugging, CAD engineering files, or wholesale pricing? Please scroll down to submit your requirements in our Inquiry Form below, and our marine engineering division will respond within 24 hours.