ABSTRACT
The MMU free running model ship consists of following equipments.
– Main electric system – Device control system – Signal measurement system – Communication system – Model ship
2.1 Main electric system
A free running model ship usually requires high capacity of power because it is operated open waters with wind disturbances.The electric system of MMU model supplies its electricity to servo motors and computer power and communication system. Two servo motors are equipped in the model ship, one (700W) for propeller and the other (100W) for rudder operation. In operation situations, the servo motors always controlled, so capacity of battery is important to keep the model powered for long time. Two of battery are installed with a 12V deep cycle method and 100ah class of parallel circuits. Output power from batteries is sent to a DC/AC inverter and converted into 220V single-phase current for each electricity equipments. A current transformers or SMPS (Switching Mode Power Supply) of 24V or 12V often is used for small capacities equipments.
