TRAC’s twin counter-rotating propellers are more efficient and can reach higher horsepower than single prop thrusters.
TRAC Thrusters in the range 25 to 200 hp may be con-figured for AC motor drive. The thruster motor is controlled by a Variable Frequency Drive (VFD) to enablevariable thruster speed and also to limit motor starting inrush current.
TRAC AC thruster systems always utilize top-quality components for maximum reliability. Marine-duty, high efficiency motors are available for horizontal or vertical mounting.
Power for the AC motor is obtained from a suitable ship’s generator (one able to supply large non-linear loads). Power line harmonic filters may be required between the generator and the VFD.