Section 8.3 Propulsion Converters
Propulsion Converters are very large variable frequency drives. Recall from Subsection 4.4.5 that VFDs are electronic devices that take fixed frequency AC and convert it to variable-voltage, variable-frequency AC. A VFD can drive an induction motor at any combination of speed and torque within the motor’s operating range.
The ship’s propulsion converters convert the fixed 6,600 V, 60 Hz AC from the High Voltage Main Switchboard (HVMSB) into a variable voltage and frequency which is used to drive the two electric propulsion motors at any speed commanded by the bridge.
| Manufacturer | General Electric |
| Model | MV7306 DFE 12P 1
|
| Rated output power | 4.75 MW |
| Input voltage | 1,850 V |
| Output voltage | variable 0 – 3,150 V |
| Output current | 1,035 A maximum |
| Supply frequency | 60H |
| Output frequency | variable 15 – 90 Hz |
