Power plant

Details Power plant Power plant

2008-03-04

2008-03-04

Masih, Karen (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S431000, C318S433000, C318S434000

Reexamination Certificate

active

07339337

ABSTRACT:
A propeller is driven by an electric motor through a mechanical drive train. The output torque of the motor to the drive train is controlled by a controller with respect to a normal torque reference signal and an emergency torque reference signal. When a measured deceleration of the motor exceeds a threshold deceleration value, the normal torque reference signal is modified or replaced by the emergency torque reference signal and the controller signals the motor to reduce or reverse the torque applied to the mechanical drive train by the motor. In this way, the integrity of the propeller and drive train can be protected if the propeller strikes an underwater obstruction.

REFERENCES:
patent: 3478622 (1969-11-01), Reid
patent: 3618719 (1971-11-01), Marland
patent: 5647780 (1997-07-01), Hosoi
patent: 6726588 (2004-04-01), Weisz
patent: 32 02 988 (1983-08-01), None
patent: 102 17 887 (2003-11-01), None
patent: 2 082 533 (1982-03-01), None
patent: 9-301275 (1997-11-01), None

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