H3X Technologies has officially released the HPDM-90S, a next-generation submerged propulsion system designed for advanced marine platforms including Unmanned Surface Vessels (USVs), hydrofoiling craft, and pod drives.
It has a compact 110 mm diameter that minimizes drag and maximizes hydrodynamic efficiency, along with an integrated inverter and direct submerged cooling to simplify installation and reduce system complexity. The system provides 160 Nm of torque up to 5500 RPM (92 kW of power). It operates quietly, efficiently, and is suitable for stealth missions and high-end marine applications.
What sets the HPDM-90S apart is its integration of cutting-edge technologies:
- High Torque in an Ultra Compact Diameter: The HPDM-90S delivers 160 Nm of torque in a form factor just 110 mm in diameter. This compact design reduces drag, enabling significant improvements in hydrodynamic efficiency.
- Integrated Drive Inverter: An integrated high-efficiency Silicon Carbide (SiC) inverter eliminates the need for a separate drive in the powerhead and having to run phase cables down a strut, thereby reducing system complexity, cost, and volume.
- Direct Submerged Cooling: Our proprietary cooling approach allows the motor to be directly cooled by its surrounding environment. No closed-loop cooling circuit is required, simplifying system design and complexity.
- Near-Silent Operation: With low acoustic and vibration signatures, the HPDM-90S is ideal for applications where noise matters—whether for stealth in defense scenarios or for a premium user experience in commercial marine vessels.
- No Gearbox - Low Maintenance: The direct-drive architecture eliminates the need for a gearbox, significantly lowering maintenance requirements and improving system uptime. The motor bearings can directly react propeller forces and are designed to have a 5000 hr grease life at 2500N of axial thrust.
- Modular Design and Tooling: Designed for flexibility, the HPDM-90S uses scalable core technology and tooling to adjust torque and power output as needed. This enables faster customization and lower costs across multiple platforms.
The HPDM-90S has already been successfully tested in real marine conditions, validating both its performance and durability.
As naval, defense, and commercial operators push for cleaner, quieter, and more compact electric propulsion, the HPDM-90S delivers on every front—combining simplicity with world-class performance.
For more information see https://www.h3x.tech/products/hpdm-90s