JPH07309294A - Propulsion assisting device for vessel by using electric motor - Google Patents

Abstract

PURPOSE:To coordinate the revolution of a propeller and the revolution of an electric motor without using the frequency changing device such as a thyristor, for the frequency generated by a dynamo. CONSTITUTION:As for a device for propulsion-assisting an existing vessel by an electric motor, a propulsion assisting engine 1 which can carry out the revolution speed control of the engine other than the propulsion engine and the load following control for the already existing propulsion engine is installed, and a dynamo 2 which is driven by the power is installed. The propulsion assisting device which utilizes a propulsion shaft 5 or an electric motor of the already existing vessel which transmits the power by supplying the output frequency of the dynamo to an electric motor 3 for propulsion without changing the cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to existing ships,
When it is necessary to increase the ship speed beyond the current capacity of the Vessel according to the demands of the times, a new generator driven by a propulsion engine that is independent of the existing propulsion engine is installed, and the electric motor is driven by the generator output. The present invention relates to a ship propulsion and energizing device for increasing a ship speed.

[0002]

2. Description of the Related Art Conventionally, there is a propulsion and energizing device using an electric motor as one method adopted for increasing the speed of ships in existing ships. The frequency of the propulsion generator is constant, including sharing with the power supply onboard, and the speed of the propeller rotation speed and the propulsion electric motor is matched according to the ship speed by the frequency control method using a thyristor. However, the equipment cost for frequency control becomes large.

[0003]

SUMMARY OF THE INVENTION In order to boost the propulsion power of an existing ship, the present invention drives a generator using an engine power other than the existing propulsion engine, and uses this electric power to propel the power via an electric motor. In this case, the frequency generated by this generator can be matched with the rotation of the propeller and the rotation of the electric motor without using a frequency changing device such as a thyristor.

[0004]

[Means for Solving the Problems] A propulsion engine and a generator are provided independently of the inboard power supply device, and the propulsion electric power generated by the propulsion engine is supplied to an electric motor without changing the frequency, and its power is used for a propeller. Fasten with the propulsion shaft. When the electric motor output is supplied to the front propeller of the double reversing propeller shown in Fig. 1, the rotation speed of the propulsion engine is controlled so that the rotation speed of the propulsion engine is matched with that of the rear propeller. In the case of the single propeller propulsion system shown in 2, load follow control is performed to follow the load of the existing propulsion engine.

[0005]

Since the present invention has taken the above means, the frequency of the generator for propulsion and energization can be changed independently of the onboard power source, and the engine speed for propulsion and energization is the propeller speed or the propeller speed according to the load. , Controlled depending on the load factor of the existing propulsion engine. Therefore, the frequency of the generator driven by this engine has already been controlled to match the load condition, and it is sufficient to drive the electric motor coupled to the propulsion shaft at this frequency, and the frequency change of the thyristor, etc. No equipment is needed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described in more detail below.

FIG. 1 shows a case where a double reversal propeller is adopted in a container ship and a propulsion engine is additionally installed. The propulsion engine (1) will be installed at the propulsion engine installation site where a container cargo hold near the propulsion axis will be additionally installed. The generator (2) is driven by this engine, and its output is connected to the front propeller (7) of the double reversing propeller and the propulsion shaft (5) fastened to the electric motor (3).
And connected via a gear unit (4).
The propulsion engine is controlled in rotation speed by a known rotation speed control device so as to match the rotation speed of the rear-mounted propeller.

FIG. 2 shows a case where a single propeller propulsion shaft system including a variable wing angle is adopted in a container ship and a propulsion engine is additionally installed. The propulsion engine (1) will be installed at the propulsion engine installation site where a container cargo hold near the propulsion axis will be additionally installed. The engine is used to drive a generator (2), and its output is connected to a propeller (11) and a propulsion shaft (10) fastened thereto via an electric motor (3). The propulsion engine is subjected to load factor control by a known load following control device so as to follow the load factor of the existing propulsion engine (9).

In this embodiment, the container freight barge is modified and the propulsion engine (2) is additionally installed, but the ship type and arrangement are free.

[0010]

According to the present invention, in propulsive energization by the conventional electric motor, the rotation speed suitable for the operating condition of the ship is obtained by an expensive frequency control device such as a thyristor. By making it possible to directly control the propulsion engine load, that is, the generator frequency, by the control device, it is possible to realize a propulsion device using an inexpensive electric motor.

[Brief description of drawings]

FIG. 1 shows a double inversion propeller (7) according to an embodiment of the present invention.
(8) and a container cargo hold are equipped with a propulsion engine (1) and a generator (2), the output of which is an electric motor (3),
It is a side view which shows the whole concept at the time of connecting with the propulsion shaft (5) of the front propeller (7) via the gear device (4).

FIG. 2 is an embodiment of the present invention, in which a propeller (11) including a variable blade angle, a propulsion engine (1) and a generator (2) are provided in a container cargo hold, and the output thereof is an electric motor (3).
It is a side view which shows the whole concept at the time of connecting with the propeller shaft (10) of the propeller (11) via.

[Explanation of symbols]

 1 ... Propulsion boosting engine 2 ... Generator 3 ... Electric motor 4 ... Gear device 5 ... Propeller shaft for front propeller 6 ... Propeller shaft for rear propeller 7 ... Propeller front 8: Rear propeller 9: Existing main propulsion engine 10: Propulsion shaft 11: Propeller

Claims (1)

[Claims] 1. An apparatus for propulsion and energizing an existing ship by an electric motor, wherein a propulsion engine (1) capable of controlling rotation speed other than an existing propulsion engine or load following control with the existing propulsion engine is provided and driven by its power. A generator (2) is installed. The output frequency of this generator is supplied to the propulsion electric motor (3) without changing the output frequency, and the propulsion shaft (5)
Alternatively, the propulsion and energizing device using the electric motor of the existing ship that transmits power to (10).