TW201938455A - Electric ship propulsion system including an engine, a generator, a motor, and a propeller - Google Patents

Abstract

The present invention discloses an electric ship propulsion system, including an engine, a generator, a motor, and a propeller which are connected in sequence. The engine is operated to output high-speed driving power to drive the generator to operate, then the generator outputs driving power to the motor and drives the motor to output torsional power, which further drives the propeller to operate, so as to achieve the purpose of propelling a ship to move forward. Through the composition of the aforementioned components, the generator can be regarded as having a function of a frequency converter, so as to adjust the operational speed of the motor (propeller). In addition to simplifying the components of the ship power system, the present invention can prevent some of the components from being operated as virtual work.

Description

Electric boat propulsion system

The invention relates to the technical field related to the power of an electric ship, and more particularly to an electric ship propulsion system.

Please refer to Fig. 2 for a description of the composition of the power system of an electric ship, which generally includes an engine 91, an alternator 92, a rectifier 93, an inverter 94, a motor 95, and a propeller 96 connected in sequence .

The above-mentioned engine 91 draws the alternator 92 to operate, so that the alternator 92 outputs the rated AC power to the rectifier 93. The rectifier 93 converts the AC power into the rated DC power to the frequency converter 94, and the frequency converter 94 is based on the user's motor speed. The setting (or demand) converts the received DC power to a specific operating frequency and transmits it to the motor 95, allowing the motor 95 to rotate according to the operating frequency, and actuating with the propeller 96 connected at the same time to achieve the purpose of advancing the ship.

After investigation, it is known that in the power of the electric ship, the above components are all on their own and cannot be related to the response or feedback, which increases the waste of energy and virtual work; for example, the speed of the motor 95 is controlled by the frequency converter 94, not Because the rotation speed of the motor 95 is reduced, the synchronous feedback engine 91 and the alternator 92 are reduced in load. As a result, excessive output of the engine 91 and the alternator 92 is equivalent to virtual work.

In the second investigation, it is known that the inverter 94 in the power of electric ships will inevitably lose in the process of converting DC power to rated AC power. According to the 400KW inverter 94 commonly used in ships, for example, its Average efficiency Between 96% and 98%, the loss of 2% alone is amazing! What's more, a loss of more than 2% is the normal condition acceptable by the inverter 94. In addition, the inverter 94 itself has a large product and weight, which is a waste of the cabin space and load capacity of the electric boat. Waste of power energy.

Further investigation, it is known that the rectifier 93 in the power of the electric ship is one of the most easily damaged components in the power conversion system. As a result, the routine maintenance cycle must be shortened, resulting in high maintenance costs and short navigation time.

In view of the problems and deficiencies of the above-mentioned conventional techniques, the main object of the present invention is to provide an electric boat propulsion system. Through the structural design of direct drive and high-speed operation, the product and weight are greatly reduced and the above-mentioned conventional techniques are overcome. .

According to the above object of the present invention, an electric boat propulsion system is provided, which includes an engine, a generator, a motor, and a propeller connected in sequence. The engine runs to output a high-speed driving power traction generator, so that the generator output directly drives electricity to the motor, the driving motor outputs torsional power, and the propeller is actuated to achieve the purpose of advancing the ship. With the composition of the above components, the generator can be regarded as the integrated function of the rectifier and the inverter, and the throttle switch that controls the engine speed can control the voltage and frequency of the generator output to facilitate the adjustment of the motor (propeller) operation In addition to simplifying the components of the ship's power system, it can also prevent the actions of certain components from becoming a lack of virtual work.

12‧‧‧engine

14‧‧‧ Generator

16‧‧‧ Motor

18‧‧‧ Propeller

<Habitual knowledge>

91‧‧‧ Engine

92‧‧‧Alternator

93‧‧‧ Rectifier

94‧‧‧ Inverter

95‧‧‧ Motor

96‧‧‧ Propeller

FIG. 1 is a block diagram of an embodiment of the present invention.

Figure 2 is a block diagram of a conventional ship power system.

Hereinafter, embodiments of the electric boat propulsion system according to the present invention will be further described with reference to related drawings. In order to facilitate understanding of the embodiments of the present invention, the same components are denoted by the same symbols below.

Please refer to FIG. 1, the electric boat propulsion system of the present invention includes an engine 12, a generator 14, a motor 16, and a propeller 18.

The engine 12 mentioned above provides a driving power. The aforementioned engine 12 generally refers to an internal combustion engine that burns petrochemical materials, such as a gasoline engine or a diesel engine, to provide high-speed driving power.

The generator 14 is connected to the engine 12 and is driven to generate a driving power. The generator 14 is selected from a permanent magnet brushless generator. During the implementation, in order to make the speed of the engine 12 match the generator 14, the connecting end of the generator 12 and the engine 11 may be further connected in series with a speed regulating unit (not shown in the figure and is a conventional technique) to adjust the output of the engine 11 The driving power speed is higher than 6000 rpm.

The motor 16 is electrically connected to the generator 14 and receives the driving power output from the generator 14 to operate to output a torsional power. The speed of the torsional power output by the motor 16 is adjusted by the voltage and frequency of the driving power. During implementation, the motor 16 needs to match the driving power (voltage and frequency) of the generator 14 and respond to the rotational speed of the torsional power in response to the driving power (voltage and frequency) changes.

The propeller 18 is connected to and driven by a motor 16. During implementation, in order to allow the torsional power speed output by the motor 16 to allow the propeller 16 to operate in a preset speed range, the connection end of the motor 16 and the propeller 18 can be further connected in series with a speed regulating unit (not shown in the figure and it is a custom (Know-how) to reduce the torsional power speed output by the motor 16 to be less than 6000 revolutions per minute.

Therefore, the above is an introduction to the components and assembly methods of the electric boat propulsion system of a preferred embodiment provided by the present invention, and the operating characteristics of the embodiments of the present invention are described below.

First, the throttle switch that controls the engine speed determines the amount of driving power that the engine 12 runs. Then, the generator 14 is driven to run, so that the generator 14 outputs driving power to the electrically connected motor 16 and provides the motor 16 to operate to output torsional power. Act 18 to push the ship forward.

By changing the output driving power through the generator 14, the torsional power speed of the motor 16 and the speed of the propeller 18 can be changed in a chain. In this way, the generator 14 can be regarded as the speed of the inverter controlling the motor 16. In addition to some of the components in the ship's power system, the power loss of the engine driving the generator at a fixed high speed for a long time in the electric ship power system can be avoided. The components such as the inverter will have power conversion losses and the inverter. Such components will be lack of purchase cost, service life and failure rate.

The above description is only a preferred embodiment of the present invention, and is intended to clarify the features of the present invention, and is not intended to limit the scope of the embodiments of the present invention. Equal changes made by those skilled in the art based on the present invention , And changes well known to those skilled in the art, should still fall within the scope of the present invention.

Claims (6)

An electric boat propulsion system includes: an engine that provides a driving power; a generator that is connected to the engine and is driven by the driving power to generate a driving power; a motor that is electrically connected to the generator, And the motor matches the driving power (voltage and frequency) of the generator, and responds to the torsional power of a different rotation speed in response to changes in the driving power (voltage and frequency); and a propeller is connected to the motor and Driven by torsional power. The electric boat propulsion system according to item 1 of the patent application scope, wherein the generator is selected from a permanent magnet brushless generator. The electric boat propulsion system according to item 2 of the scope of patent application, wherein the rotational speed of the driving power is higher than 6000 revolutions per minute. The electric boat propulsion system according to item 3 of the scope of patent application, wherein the rotational speed of the torsional power is lower than 6000 revolutions per minute. The electric boat propulsion system according to item 4 of the scope of patent application, wherein a speed regulating unit is further connected in series between the engine and the generator. The electric boat propulsion system according to item 5 of the scope of patent application, wherein a speed regulating unit is further connected in series between the motor and the propeller.