Search International and National Patent Collections
|1. (WO2017149588) SHIP PROPULSION DEVICE AND SHIP PROPULSION METHOD|
|Applicants:||NIIGATA POWER SYSTEMS CO., LTD.
|Title:||SHIP PROPULSION DEVICE AND SHIP PROPULSION METHOD|
[Problem] To stabilize the rotational speed of an engine generator in a ship propulsion device that is capable of electric propulsion. [Solution] A ship propulsion device 1 that has: an engine generator 4; a propulsion motor 9; an inverter 8 that performs torque control on the motor; a deviation limiter 16 that controls the deviation between the actual value and a target value for motor rotational speed to a prescribed value or less; and a PID regulator that computes a torque command value such that the deviation decreases and that outputs the torque command value to the inverter. Parameters for the PID regulator are set as appropriate, and the response speed of the inverter is matched to the response speed of the engine generator. Variation in the power supplied to the motor is kept to an amount to which the engine generator can respond, the engine generator is prevented from hunting, and the rotational speed of the engine generator is stabilized.