JPS61124277A - Thrust unit starter with variable pitch propeller - Google Patents

Abstract

PURPOSE:To start without using a special starter by starting a thrust unit by a start motor having small capacity at starting time, and driving a drive motor when arriving at a rated speed. CONSTITUTION:When a controller 5 for driving a thrust unit 1 is operated, a controller 5 sets a magnet switch 7 to ON, and power is supplied to a start motor 4. Since a starting current flowed to the motor at starting time is much smaller than the starting current when starting by supplying a current to a drive motor, a power source is directly supplied to start without using a special starter. When a signal supplied from the motor 4 to the controller 5 represents the rated speed, the controller 5 sets a magnet switch 6 to ON to supply power to the motor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thruster starting device with a variable pitch propeller for starting a thruster with a variable pitch propeller driven by a large induction motor.

[Conventional technology]

Conventionally, when a ship berths or anchors in a place with tidal currents, ships equipped with thrusters drive the thrusters to generate thrust perpendicular to the longitudinal direction of the ship to obtain the desired position of the ship. I have to. This thruster is
A system using variable pitch propeller control driven by a squirrel-cage induction motor is often adopted. ◇ Also, since it is necessary to generate thrust in a direction perpendicular to the direction of movement of the ship, this thruster has the capacity of one ship-mounted generator. It is often necessary to have a large capacity close to .

[Problem that the invention seeks to solve]

This thruster generally puts the variable pitch propeller in a neutral state so that it starts with the least load, but because the capacity of the motor is large, the starting current is large, so a large-capacity Condorpha starter is used, etc. Therefore, the startup method became expensive, making it uneconomical.

[Means for solving problems]

The starting motor and the driving motor are made to rotate integrally, and at the time of starting, the starting motor with a relatively small capacity performs starting, and after the rotational speed of the starting motor reaches the rated speed, the large capacity driving motor is driven.

[For production]

Since the diopter current is small when a large-capacity drive motor is turned on, a simple and economical drive system such as a direct-on system can be adopted.

〔Example〕

The figure is a block diagram showing one embodiment of the present invention. In the figure, 1 is a thruster, 2 is a variable pitch propeller of the thruster 1, 3 is a drive motor, 4 is a starting motor, 5 is a control unit, 6. γ is a magnet switch, 8 is a breaker, and 9 is a power bus.

The drive motor 3 and the starting motor 4 are designed to rotate together, and the control section 5 turns on the magnetic switch T at the time of starting, and when a signal indicating that the starting motor 4 has reached the rated speed is supplied, In addition to the magnet switch T, the magnet switch 6 is also controlled to be turned on.

The operation of the hole device constructed as described above is as follows. First, when the control section 5 is operated to drive the thruster 1, the control section 5 controls the magnet switch 7 to turn it on, so that power is supplied to the starting motor 4.

The starting motor 4 has the capacity necessary to drive the thruster 1 when the variable pitch propeller 2 is in a neutral state, and the capacity necessary to bring the drive motor 3, which rotates together with the starting motor 4 and under no load, to the rated speed. It has a total capacity. This value is 1 of the full load output of the drive motor 3.
Therefore, the starting current flowing to the starting motor at startup is a very small value compared to the starting current when starting by supplying power to the drive motor. It can be started by directly supplying power.

When the signal supplied from the starting motor 4 to the control unit 5 comes to represent the rated rotation speed, the control unit 5 turns on the magnetic switch 6. Therefore, power is supplied to the drive motor 3, and the thruster 1 is driven by both the drive motor 3 and the starting motor 4. Since the rotational speed at this time is the rated rotational speed, the slippage is very small and no large current flows through the drive motor 3.

〔Effect of the invention〕

As explained above, in this invention, the thruster is started by a small-capacity starting motor at startup, and the drive motor is driven when the starting motor reaches its rated speed. Starting can be performed without using a special starter, which has the effect of improving economic efficiency.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention.
3... KATIJJ motor, 4... Starting motor, 5... Tube... Control section, 6, 7... Magnet switch.

Claims (1)

[Claims] Consists of a starting motor that starts the thruster with a variable pitch propeller that is in a stopped state, a driving motor that rotates together with the starting motor, and a control unit that drives the driving motor after the rotational speed of the starting motor reaches the rated speed. Thruster activation device with variable pitch propeller.