The electrical system in pod propulsion normally consists of a transformer, a frequency
converter and an electric motor. The transformer is used to divide the system into several
parts in order to obtain different voltage levels but also for phase shift voltages for the
used rectifiers. The purpose of the frequency converter is to control the speed and torque
of the motor by changing a constant frequency from the main generator into variable
frequency for the motor. The electric motor is used for conversion from electrical to
mechanical power for the propeller.
Azipod has a synchronous motor controlled by a cyclo converter and dry type
transformer. The non-drive end bearing is insulated and the shaft is grounded to earth in
drive end and to the bearing housing in non-drive end. Mermaid has a dry type
transformer and a synchronous motor controlled by a load commutated inverter (LCI).
Both bearings are insulated and the shaft is grounded at the drive-end.
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