JPS6026434A - Shaft generating system for driving synchronous and dc generators in parallel by differential gear - Google Patents

Abstract

PURPOSE:To improve the efficiency of the entire system by generating the prescribed rotation by a differential gear from the varying rotation of a main shaft to drive an AC synchronous generator and a DC generator and driving auxiliary units which need to be shifted at its speed by controlling a DC motor. CONSTITUTION:The rotation of a main shaft 1 is transmitted through an accelerating spur gear 2 and an intermediate gear 4 to an accelerator pinion gear 3. A planet type differential gear 5 has a ring gear 6 driven by the gear 3, a planet gear 7, a sun gear 8 and a planet gear 9. A drive gear 10 is driven by the gear 5 to drive a pinion gear 14 for a synchronous generator 16 through an intermediate gear 12. The gear 5 drives a pinion gear 13 for a DC generator 15 through an intermediate gear 11. The generator 15 varies its rotating speed in response to the rotation of the shaft 1 by controlling a field current, thereby maintaining the rotation of the generator 16 constant. An auxiliary unit 18 to be shifted at its speed is driven by a DC motor 17. Thus, mechanical loss is reduced to improve the efficiency.

Description

[Detailed Description of the Invention] In recent years, in order to save energy, large diesel ships have come to use so-called shaft-powered engines, which drive generators with main engines that are highly efficient and can use low-quality fuel. in this case,
The problem is that when the rotation speed of the propeller shaft, which is directly connected to the main engine, changes, the cycle of the generated AC electricity changes. To solve this problem, methods have been taken to keep the cycle of the generated AC electricity constant using electromagnetic clutches, hydraulic clutches, hydraulic transmission transmissions, and frequency converters using l-run sisters and thyristors. There is.

However, at this time, electromagnetic joints and hydraulic clutches maintain a constant rotational speed due to slipping, which causes large losses, and hydraulic power transmission has many difficulties in transmitting such large horsepower. Furthermore, the method of using semiconductors is very measured, the conversion loss is not small, and there are problems of harmonic generation. Variable speed operation is also required for the drive of auxiliary equipment, such as cooling water pumps, which use the generated power to save energy. For this reason, a similar variable speed system is used here as well, which similarly requires a large amount of effort and expense.

The present invention solves these problems.8. Auxiliary machines that need to be driven at variable speeds use DC motors that can be easily changed in speed, and the power source for these is a DC generator that generates electricity without any problem even when the rotational speed changes. In other words, the propeller shaft drives a DC generator through a differential gear, and when there is a change in the rotation speed of the propeller shaft, the rotation speed of the DC generator is changed, and the synchronous generator connected to the other side of the differential gear is The generator is controlled so that it rotates at a constant rotation speed regardless of changes in the rotation speed of the propeller shaft. This DC generator may be of the AC dynamo type used in automobiles, in which the generated alternating current is rectified by a silicon rectifier. Even in automobiles, the field current is adjusted according to changes in the engine's rotational speed, so that a specified amount of electric power is generated regardless of changes in the rotational speed.

Next, details will be explained with reference to the drawings. FIG. 1 shows the overall structure of the present invention, and 1 is a propeller shaft. 2 is a speed increasing spur gear, and 3 is a speed increasing pinion gear. 4 is an intermediate gear, which is a hollow gear type speed increaser.
It is also possible to use the speed reduction/acceleration 1 using rubber tires of 079f Gu Otsu. In this case, 2.3 will be a plain roller, 4 will be a rubber tire, and 5 will be a planets 1.
- It is a gear type differential gear. In this system, unlike the differential gear of an automobile, a speed increasing action is also performed. 6 is a ring gear, 7 is a planet gear, and 8 is a sun gear.

9 is a planet gear carrier, which itself is a spur gear. 10 is a drive gear of the sun gear 8. 1
1 and 12 are intermediate gears, 13 is a pinion gear for a DC generator, and 14 is a pinion gear for a synchronous generator. As mentioned above, these power transmission parts can also be made using a patent application [speed reduction/increase using rubber tires]. In this case, it is advantageous in terms of price. 15 is a DC generator (a synchronous generator equipped with a silicon rectifier like an AC dynamo may be used).

16 is a synchronous generator. The DC generator 15 changes its rotation speed according to the change in the rotation speed of the propeller shaft 1 by controlling the field current, etc., so that the rotation speed of the synchronous generator 16 is kept constant. . 17 is a DC motor. 18 is an auxiliary machine such as a cooling water pump. Since this pump needs to be operated in an energy-saving manner by varying the rotational speed depending on the engine load and cooling water inlet temperature, this purpose is achieved by changing the speed of the DC motor 17.

[Brief explanation of drawings]

18

Claims (1)

[Claims] At the propeller shaft, a synchronous generator for constant-cycle AC power for lighting and other general purposes, and a DC generator for the DC motor that drives auxiliary equipment at variable speeds are driven in parallel by differential gears. A shaft-based system that drives a synchronous generator and a DC generator in parallel using differential gears, which drives the synchronous generator at a constant rotation regardless of changes in the rotation speed.