Ferreirolo ® 09-May-2020 20:01

Electrical systems in pod propulsion

Year: 2007
Language: english
Author: Lena Bergh Ulrika Helldén
Genre: Research papers
Publisher: Chalmers
Format: PDF
Quality: eBook
Pages count: 67
Description: Since the middle of the 1990 ?s pod propulsion in marine applications have become common. There are mainly two manufactures on the pod market. ABB is the biggest producer and has two types of pod-types, Azipod (5-30 MW) and Compact (0.4-5 MW). Rolls-Royce (RR) is the second biggest company on the market, producing a pod called Mermaid (5-25 MW).
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.
The biggest change in pod propulsion within the foreseeable future is a switch to voltage source inverter with pulse-width-modulation (VSI-PWM). Permanent magnet synchronous motors (PMSM) are an alternative in smaller pods and the development of magnets can make PMSM to an alternative for bigger pods. In addition, induction motors is an alternative motor in the future.



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