Magnetoelastic transducer for measuring torque and axial efforts of propellor shafts in ships

Conclusions

• 1. The transducer is highly sensitive. Its sensitivity amounts in measuring torque on an average to 0.05 mV/N·m, and in measuring thrust to 0.002 mV/N·m.

• 2. The instrument readings up to +70°C are virtually independent of the shaft temperature.

• 3. Since the operation of the transducer is based on the main magnetic fluxes in the excitation winding, it is less sensitive to external magnetic fields than the cruciform-type transducer and it does not require magnetic shielding, however, the conductors which connect the transducer to the measuring instrument's output should be screened.

• 4. The output voltage waveform is virtually sinusoidal.

• 5. Magnetoelastic transducers can be recommended for measuring Tq and p in the shafts of ships, since they are highly sensitive, contactless, they have a low inertia, a simple design, small measuring base, etc. Further research will undoubtedly help to improve their characteristics and properties.