Electric Boat Motors

 

Marine Propeller with Embedded Electric Motor

Conventional thruster systems (hydraulic or electric) consist of a propeller driven by a motor via a shaft operate under ship’s hull. This design has hydrodynamic drawbacks.

In this new technology (type: driven thruster) brushless permanent magnet motors are structurally integrated in a marine propeller. The stator of the motor is mounted in the duct while the rotor forms a ring around the propeller rim. Only the propeller blades are in the water and only electric cables pass through the hull.


Advantages:

  • High efficiency
  • Improved thrust protection
  • Low mentenance
  • Shorter length
  • Bidirectional
  • Low noise
Prospect Propulsor RTH 75-36Prospect Propulsor RTH 90-325Prospect Propulsor RTH 185-48Prospect Propulsor P10-1200-48


Applications:

  • Underwater vehicles, submarines, remoted operated vehicles, ships
  • This configuration is also suitable for other applications such as marine turbine generators, fans and pumps

We made an experimental demonstrator:

  • Outer diameter of the propeller: 70 mm
  • Outer diameter of the thruster: 107 mm
  • Total length: 85 mm
  • Thrust force: 26 N

The motor type is brushless, three phases, slotless with 16 magnetic poles.

6-poles Permanent Magnet Brushless Synchronous Motor. 4kW/400rpm, 48V DC supply voltage.

10 kW Motor for Electric Boat

Synchronuos brushless motor with permanent magnets
  • 12 magnetic poles
  • 5 kW @ 1500 rpm (free cooling); 10kW @ 1500 rpm (water cooling)
  • Peak Torque: 60 Nm
  • Supply Voltage: 72 VDC
  • External diameter: 320 mm
  • Lenght: 150 mm

10 kW – cooled water                                5 kW – free cooling

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