JPH0872796A - Inverter system for ship - Google Patents

Abstract

PURPOSE: To provide an inverter system for ship which can minimize the number of inverters installed and substantially reduce the cost of equipment. CONSTITUTION: While a plurality of inverters 5A, 5B are provided between a main generator power source 1 and main propeller device motor 2 and between thruster motor 3 and cargo pump motor 4, a plurality of windings of the main propeller device motor 2 are connected respectively to the inverters 5A, 5B through change-over switches 8, 9. Also, the thruster motor 3 is connected to a plurality of cargo pump motor 4 through change over switches 10, 11, 12 and inverter 5A, and the other inverter 5B is connected to a portion of the cargo pump motor 4 through a change-over switch 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter system for a ship, which shares an inverter for driving a motor of a ship propulsion device and an on-board device.

[0002]

2. Description of the Related Art An inverter system is a system in which an alternating current power source is once converted into a direct current and then recreated into an alternating current waveform of a required shape, and by utilizing its characteristics, a variable speed drive of a drive device of a ship or a vehicle or a turbo machine. It has been adopted as a device, and in the case of a ship, the ship navigation propulsion device is electrified by an electric motor driven by an inverter. In that case, however, the inverter drive for the main propulsion device, the thruster and the cargo handling may be installed separately, or the inverter drive may be applied only to the main propulsion device, and the other may be mechanically driven by hydraulic drive, variable speed thruster, Other electrical methods such as a 2-speed electric motor driven cargo pump are adopted.

However, applying the inverter drive to all of the main propulsion equipment and onboard equipment for a ship increases equipment cost and makes it expensive, and only the main propulsion equipment is driven by the inverter and other onboard equipment is mechanically or It is undeniable that a combination of other electrical methods, such as performance, will impair performance and functionality.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such circumstances, and the number of installed inverters can be minimized, and the equipment cost can be greatly reduced, and the ship It is an object of the present invention to provide an inverter system for a ship that can achieve high performance and high functionality of each device installed.

[0005]

To this end, the present invention is directed to a system in which a ship navigation propulsion device is driven by an electric motor driven by an inverter, and the main propulsion device is driven by a plurality of inverters to carry out rated sailing and mooring / decoupling. / It is characterized in that a plurality of inverters are switched and used according to each required application at the time of cargo handling.

[0006]

In the inverter system for a ship of the present invention,
It is possible to switch and use multiple inverters for each required application such as rated navigation, mooring / berthing / berthing / loading, minimizing the required number of inverters and improving the performance and functionality of each device. You can In particular, if the electric motor for the main propulsion device is provided with a plurality of windings that are individually energized and driven, the reliability with respect to the occurrence of nonconformity is improved in combination with the plurality of inverters. Moreover, the surplus inverter under partial load can be easily diverted to other on-board equipment. In addition, the height of the motor shaft and the width in the direction perpendicular to the shaft are reduced, which facilitates placement on the ship.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the marine vessel inverter system of the present invention will be described with reference to the wiring diagram of FIG. A plurality of inverters 5A and 5B are provided between the main generator power source 1 and the multi-winding main propulsion device electric motor 2, thruster electric motor 3 and cargo pump electric motor 4. The plurality of windings of the main propulsion device electric motor 2 are connected to the plurality of inverters 5A and 5B via the changeover switches 8 and 9, respectively. In addition, the thruster motor 3 and a plurality of cargo pump motors 4
Are connected to one of the plurality of inverters via 5A and the changeover switches 10, 11 and 12, respectively. The other inverter 5B is connected to a part of the cargo pump electric motor 4 via the changeover switch 13. An input transformer 6 is provided between the inverters 5A and 5B and the main generator power source 1, and a reactor 7 is provided between the inverters 5A and 5B and the main propulsion unit electric motor 2 for smoothing voltage and current waveforms. Each is provided.

In such a system, at the time of rated navigation, the main propulsion device electric motors 2 are individually driven by the inverters 5A and 5B to generate thrust required to obtain a navigation speed. When the inverter 5A or the inverter 5B or the motor winding fails for some reason, the normal-side inverter and winding are used to carry out partial load promotion until the failure repair. Since the main propulsion thrust may be small at the time of entry, departure, or fixed point mooring, the propulsion force is obtained by the winding on one side of the inverter 5B and the main propulsion unit electric motor 2, and the inverter 5A is switched to the thruster electric motor 3 to perform the main propulsion. Individual rotation speed control of the device and the ball thruster is performed. When unloading, the inverters 5A and 5B are connected to the cargo pump motor 4
, And carry out individual variable speed drive of the cargo pump. In this way, the combination of the motor winding and the inverter is appropriately selected.

Thus, according to the ship inverter system, when the main propulsion device electric motor 2, thruster electric motor 3 and cargo pump electric motor 4 are driven by an inverter, a plurality of inverters 5A, 5B are installed. Can be minimized, and the equipment cost can be greatly reduced. Further, since the main propulsion device motor 2 has a plurality of windings and is driven by a plurality of inverters 5A and 5B, the reliability at the time of non-conformity is remarkably improved and the conformity to the requirements for the arrangement is increased.

[0010]

In summary, according to the present invention, in a system in which a ship navigation propulsion device is driven by an inverter-driven electric motor, the main propulsion device is driven by a plurality of inverters to perform rated navigation, and at the time of mooring / decoupling / berthing For example, by switching and using multiple inverters according to each required application, the number of installed inverters can be minimized, the equipment cost can be greatly reduced, and the high performance of each equipment installed on the ship The present invention is extremely useful industrially because a marine inverter system capable of achieving higher performance and higher functionality is obtained.

[Brief description of drawings]

FIG. 1 is a connection diagram of an embodiment of a marine inverter system according to the present invention.

[Explanation of symbols]

 1 Main generator power supply 2 Motor for main propulsion device 3 Motor for thruster 4 Motor for cargo pump 5A, 5B Inverter 6 Input transformer 7 Reactor 8, 9, 10, 11, 12, 13 Changeover switch

Claims (2)

[Claims] 1. In a system in which a ship navigation propulsion device is driven by an inverter-driven electric motor, the main propulsion device is driven by a plurality of inverters to perform rated navigation and
An inverter system for ships, which is characterized by switching and using multiple inverters according to each required application, such as during docking / unloading / loading. 2. A marine inverter system, characterized in that the propulsion device motors are of a multi-winding type that can be individually energized and driven, or the single-winding motors are of a multi-arraying type, and these are combined with a plurality of inverters. .