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CASE STUDY

Smart Propeller: Electric ship propellers with added value

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Approach: utilizing the excellent controllability of e-drives and VirtualSensor

It is obvious that the sensitive and fast-reacting speed control of electrically driven ship propellers leads to excellent maneuverability, for example when maneuvering at a landing stage. When combined with VirtualSensor real-time torque measurement, further functions with significant added value can be realized.

Added value 1: Prevention of cavitation

Preliminary tests have shown that the cavitation effects indicated in the figure above can be detected quickly and sensitively – without any additional sensors. This detec-tion can then be used to prevent cavitation.

  • To avoid damage to the propeller, etc.
  • To improve the thrust effect, for shorter acceleration and braking distances



Additional benefit 2: Propeller diagnostics in normal operation

The rudder causes a “shadow” in the propeller’s flow. This results in a minimal variance in the propeller’s torque. With 4 blades, 4 times per revolution.

Damage to one of the blades, for example, causes its torque variance to show a dif-ferent amplitude and/or shape compared to the other 3.

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