JPS61211196A - Controller for electric propulsion - Google Patents

Abstract

PURPOSE:To vary the braking force continuously by bringing an electrode from the hull into/out of the sea water and adjusting the contacting area between the electrode and the sea water in order to consume the energy of motor through a resistor upon deceleration. CONSTITUTION:In order to obtain the liquid for general liquid resistor from the outerboard sea water, an electrode drive unit 11 for bringing an electrode 9 through the bottom of vessel into/out of the sea water is provided. In order to insulate from the hull, the electrode 9 is slided through an insulator 10. Since the braking distance is precalculated on the basis of the vessel speed or other conditions, corresponding torque is determined to decide the corresponding power thus to decide the necessary resistance and the length of electrode. Furthermore, since the vessel speed is detected through maneuvering device, the differential speed is detected and amplified if it is not decelerated to the expected level then fed back to the electrode drive unit 11 thus to achieve the optimal deceleration.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a brake resistor for a marine electric propulsion system, and is particularly applicable to the secondary resistor of a winch or the like in which a wire-wound induction motor is used. The present invention relates to an electric propulsion control device.

[Background of the invention]

Superconducting Electric Propulsion System Concept for WH Company Ships and U.S. Navy Ships
c Propulsion System for Me
rchant & Naval 5hip Conce
Figure 4 shows a single line diagram around the main electric propulsion circuit. FIG. 1 shows what is generally called a thyristor motor system, in which the screw 2 is driven by a transformer 6 using electric power received by an electric motor 3 through a circuit breaker 7A.
3, and is controlled by a thyristor 4 and a reactor 5 to obtain forward/reverse rotation and a predetermined speed.

In this example, the thyristor motor system is explained, but there are many other electric propulsion systems, and in any of these systems, during deceleration, the kinetic energy of the ship is recovered by the electric motor through the screw. is necessary. How the energy for braking is disposed of is the key to smooth acceleration and deceleration, and there are various methods that can be broadly classified.

It becomes dynamic braking and regenerative control. The latter requires equipment and has a complicated structure, so the former is often selected.

In FIG. 4, brake resistor 8 takes on the function of 2.

That is, when control is required, the electric motor 3
When the output end of the boat is short-circuited by the brake resistor 8, as a result, during deceleration, the electric motor 3 temporarily acts as a generator and consumes the generated electric power, thereby decelerating the ship.

In such a dynamic braking system, metal resistance must be selected depending on the environmental conditions such as rocking and tilting of the ship.

In general, liquid resistors are smaller than metal resistors and are advantageous when installed in a limited space such as a ship, but as mentioned above, they have some drawbacks.

On the other hand, in the case of metal resistors, according to some calculations.

It has been reported that the brake resistance of a 200,000 ton class tanker was 135 tons, putting pressure on the electrical room inside the ship and requiring large equipment to cool it.

FIG. 5 is a conceptual diagram showing the arrangement of equipment in a ship according to the method shown in FIG. 4, and 8 in the figure is a large burden.

Figure 6 generally shows the relationship between the speed of the screw and the hull of a ship.
That is, it requires energy.

[Purpose of the invention]

The purpose of the present invention is to reduce the size and weight of equipment, which is one of the biggest factors hindering the adoption of propulsion systems. It's what I asked for.

[Summary of the invention]

The present invention reverses the relationship between a water tank, an electrode, and a liquid in a general liquid resistor, and combines the hull, electrode, and seawater.

In order to adjust the braking force, it is sufficient to adjust the energy consumed by the resistor, so the contact area between the electrode and the seawater is adjusted by moving the electrode in and out of the seawater from the hull.

In other words, if the electrode drive device can be activated by a ship maneuvering command to adjust the contact area between the electrode and the seawater by anticipating the speed at which the ship should decelerate and the time at which it should decelerate, it will be possible to accelerate and decelerate the ship easily. Furthermore, unlike metal resistors, they can be continuously adjusted.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIG. 1, and details thereof are shown in FIG. The present invention requires the liquid in a general liquid resistor to be seawater outside the ship. That is, as shown in FIG.
Electrode drive device 11 that raises and lowers the electrode into seawater through the bottom of the ship.
is provided.

The electrode 9 slides through the insulating material 1o to insulate it from the hull. The insulating material 1o has a structure that prevents seawater from entering the ship. Reference numeral 11 in FIG. 2 is an example of a gear mechanism, and there are many possible ways to drive the electrodes.

Referring to FIG. 3, the operation during deceleration will be explained. As shown in Fig. 6, for example, the braking distance L0 is calculated in advance from the ship speed and other conditions (for example, the ship weight, the distance to decelerate, etc.), so the corresponding torque T0 is determined and the corresponding torque T0 is determined. Since the energy (power) Po is determined, the necessary resistance R0 is determined, and the electrode length H8 is determined.

Naturally, since the ship speed is detected in the ship maneuvering device, if the ship speed is not decelerated to the expected value, the speed deviation is detected, amplified, and fed back to the electrode drive device 11, so that the optimal deceleration is always achieved. becomes possible.

〔Effect of the invention〕

According to the invention, large spaces such as metal resistors,
No additional equipment required. Since the resistance value can be changed continuously like a liquid resistor, the braking force can be changed continuously, and as a result, it can be incorporated into the automatic control system of the ship maneuvering device.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a clear view of an embodiment of the present invention, FIG. 2 is a detailed view of FIG. 1, and FIG. 3 is an explanatory diagram of the relationship between braking distance and electrode length. Figure 4 is a diagram showing an example of the main circuit of the electric propulsion device, Figure 5
The figure is a conceptual diagram of the equipment inside the ship shown in FIG. 4, and FIG. 6 is a diagram showing the relationship between ship speed and screw torque. Figure 1! Figure 2 3 Figure 4 Figure 2

Claims (1)

[Claims] 1. In an electric propulsion device that drives a ship's propulsion device by variable speeding an electric motor, energy during deceleration of the electric motor is consumed by a resistor, and the resistor is connected to the outside of the ship. 1. An electric propulsion control device characterized by comprising an electrode driving device for varying the contact area between an electrode inserted into and removed from seawater and the seawater.