TW201938454A - Electric ship propulsion system including an engine, a generator, a high-frequency rectifier, a permanent magnet DC brush motor, and a propeller - Google Patents

Abstract

The present invention discloses an electric ship propulsion system, including an engine, a generator, a high-frequency rectifier, a permanent magnet DC brush 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, so that the generator can output the driving power to the high-frequency rectifier. After being rectified by the high-frequency rectifier, the driving power is formed into high-frequency driving power, so as to drive the permanent magnet DC brush motor to operate and output the torsional power, and further drive the propeller to rotate to achieve the purpose of propelling a ship to move forward. Through the composition of the aforementioned components, it can not only simplify the components of the ship power system, but also avoid some of the components from being operated as virtual work.

Description

Electric ship 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, the components of the conventional electric ship power system, which generally include an engine 91, an alternator 92, a rectifier 93, an inverter 94, a motor 95, and a propeller connected in this order. 96.

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.

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

According to the above object of the present invention, an electric ship propulsion system is provided, which includes an engine, a generator, a high-frequency rectifier, a permanent magnet DC brush motor, and a propeller connected in sequence. The engine runs to output high-speed driving power to traction the generator, so that the generator directly drives the power to the high-frequency rectifier. After the high-frequency rectifier is rectified, high-frequency driving power is formed to drive the permanent magnet DC brush motor to output torsional power. The propeller rotates to achieve the purpose of advancing the ship. With the composition of the above-mentioned components, in addition to simplifying the components of the ship's power system, it is also possible to prevent the actions of several components from becoming a lack of virtual work.

11‧‧‧ Engine

12‧‧‧ Generator

13‧‧‧High Frequency Rectifier

14‧‧‧ permanent magnet DC brush motor

15‧‧‧ 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.

The following further describes embodiments of the electric ship propulsion system of the present invention with reference to related drawings. To facilitate understanding of the embodiments of the present invention, the following same elements The same symbols are used for explanation.

Please refer to FIG. 1, the electric ship propulsion system of the present invention includes an engine 11, a generator 12, a high-frequency rectifier 13, a permanent magnet DC brush motor 14, and a propeller 15.

The above engine 11 provides a driving power. The aforementioned engine 11 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 12 is connected to the engine 11 and is driven to generate a driving power. The generator 12 is selected from a permanent magnet brushless generator. During the implementation, in order to make the speed of the engine 11 match the generator 12, the connecting end of the generator 12 and the engine 11 can 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 high-frequency rectifier 13 receives the driving power output from the generator 23, converts its frequency to 400 Hz (Hertz) or higher, and then outputs and drives the permanent magnet DC brush motor 14. The high-frequency rectifier 13 works at a high frequency to greatly reduce its own product and weight.

The permanent magnet DC brush motor 14 is electrically connected to the high-frequency rectifier 13 and receives high-frequency driving power output from the high-frequency rectifier 13 to output a torsional power. The speed of the torsional power from the aforementioned permanent magnet DC brush motor 14 is controlled and adjusted by the voltage and frequency of the high-frequency driving power. During implementation, the permanent magnet DC brush motor 14 needs to match the high-frequency driving power (voltage and frequency) of the high-frequency rectifier 13 and adjust the rotation speed of the torsional power in response to the change of the high-frequency driving power (voltage and frequency).

The above-mentioned propeller 15 is connected to and driven by a permanent magnet DC brush motor 14. During implementation, in order to allow the rotation speed of the torsional power output by the permanent magnet DC brush motor 14 to enable the propeller 16 to operate in a preset speed range, the permanent magnet direct current The connection end of the brushed motor 14 and the propeller 16 can be further connected in series with a speed control unit (not shown in the figure and a conventional technique) to reduce the torsional power speed output of the permanent magnet DC brushed motor 14 to be lower than per minute 6000 rpm.

Therefore, the above is an introduction to the components and assembly methods of the electric ship 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 11 runs to output, and then the generator 12 is driven to run, so that the generator 12 outputs driving power to the electrically connected high-frequency rectifier 13 and the driving power is output through the high-frequency rectifier 13 The permanent magnet DC brushed motor 14 is operated to allow the permanent magnet DC brushed motor 14 to output torsional power, which is actuated in conjunction with the propeller 15 to propel the ship to travel.

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 ship 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 high-frequency rectifier that receives the output of the generator The driving power converts its frequency to one of the high-frequency driving power above 400HZ (hertz); a permanent magnet DC brush motor is electrically connected to the high-frequency rectifier and matches the high-frequency driving power of the high-frequency rectifier (Voltage and frequency) and responds to the change of the high-frequency driving power (voltage and frequency), and outputs one of the torsional power at different speeds; a propeller is connected to the permanent magnet DC brush motor and is driven to rotate by the torsional power. The electric ship propulsion system according to item 1 of the patent application scope, wherein the generator is selected from a permanent magnet brushless generator. The electric ship 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 ship 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 ship propulsion system described in 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 ship propulsion system according to item 5 of the scope of patent application, wherein a permanent magnet DC brush motor and the propeller are further connected in series with a speed regulating unit.