SU873346A1 - Linear ac current generator - Google Patents

Abstract

A linear alternating-current generator comprises a fixed magnet system (2). Channels (6) filled with a molten metal and interconnected hydraulically are provided in the gaps of the magnet system (2). The hydraulic interconnection of the channels (6) is a parallel one. Armatures (7) are mounted in the channels (6) and connected with pistons (10) of an engine (11) providing the possibility of reciprocating movements of the armatures (7). Energy collecting electrodes (5) are in contact with the armatures (7). The number of channels (6) of the armatures (7) mounted in them and of pistons (10) of the engine (11) which are connected with them is divisible by three. The armatures (7), relating to each phase, have a star or delta interconnection.

Description

(54) LINEAR ALTERNATOR ALTERNATOR

one

The invention relates to the production of electrical energy, namely, devices for converting mechanical energy of a primary engine into electrical energy, and is intended for use primarily in autonomous power plants at transport facilities and in emergency power supply systems.

Rotating-core generators are known for producing three-phase electric current 1.

The disadvantage of such generators is a large specific mass (kg / kW) and a long time to reach the nominal power regime in the order of ten seconds.

A linear alternating current generator is also known, which contains a stationary magnetic system with excitation windings placed on it and electrodes adjacent to channels with liquid metal, each of which contains measles made in the form of a plate of electrically conductive material 2.

However, the known linear generator is fundamentally single phase and, accordingly, does not provide the possibility of obtaining a three phase current.

The purpose of the invention is to obtain a three-phase current using a linear generator.

The goal is achieved by the fact that the J channels are hydraulically connected in parallel, and their number is a multiple of three, and the magnetic system is equipped with cores on which are placed the windings that are the secondary windings of the output transformer, and the primary winding 10 of the transformer is an electrical circuit mi and electrodes, closed between a liquid metal.

In addition, when the number of channels is more than three, to ensure the stability of the operation of measles, each phase is strictly connected 15 to each other.

FIG. 1 shows a linear alternator, a cross section; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 is a diagram of the hydraulic connection of the channels.

20

The generator contains a stationary magnetic system, including a / 1 magnetic core 1 and coils in buzhdeni 2,

body 3 with channels 4 made of liquid metal and cores 5 placed in them. Channel 4 sections in which core 5 is located are partially located in the gaps of the magnetic circuit 1, so that their axes coinciding with the direction of movement of core 5 are parallel to each other . The generator also contains electrodes 6 that connect the core 5 electrically into a star and encompass the cores 7 of the output step-up transformer with secondary coils 8 connected to a load (not shown). The armature 5 is a set of plates of materials with high magnetic permeability and high electrical conductivity, separated in a direction transverse to the movement by insulating gaskets, which serve to reduce the longitudinal currents. The armature 5 is connected to the engine pistons (not shown) by means of plugs 9 passing through seals 10 in the generator chamber, for example, free-piston internal combustion.

The generator works as follows.

When moving, the pistons of the engine box 5 perform a reciprocating movement in the magnetic field created by the magnetic system 1 and 2. In accordance with the law of electromagnetic induction, the emf is induced in the core 5, which in the electrical circuit formed by the core 5 and electrodes 6, closed between a liquid metal, causes an alternating electric current. This electrical circuit is the primary winding of the power take-off transformer, which through the core 7 is electromagnetically connected to the secondary windings 8. Therefore, a current flows at the required voltage in the load connected to the winding 8.

With this design it is possible to directly cool only fixed parts of the generator. Efficient cooling of moving parts is ensured due to the high thermal conductivity of the liquid metal, which allows the process of generating electrical energy at high bulk density. Anchor 5 have cross-sectional dimensions close to the cross-sectional dimensions of channel 4, which provides hydraulic phase synchronization and a small amount of shunt current in the liquid metal layer between the crust 5 and the wall of channel 4.

Optimum weight and size characteristics of the device are provided with its axial symmetry, when the axes of each phase are located relative to each other at an angle of 120 °, since it is with this design that the forces acting in the device are evenly distributed.

With the construction of a generator connected to a free-piston engine, a self-oscillating three-phase system is formed, ensuring stable mechanical oscillations with a shift

phases at 120 °, which accordingly provides a three-phase electric current. When the number of koreas in one phase, more than one, conditions are created for the conversion of mechanical energy into electrical energy with greater efficiency and better weight and weight indicators due to a more rational electrical connection of the koreas to each other when the output transformer is included in the circuit, in which the core is part of the primary

windings.

The proposed design of the linear generator provides the possibility of obtaining a three-phase current with high efficiency and high weight-dimensional indicators at frequencies of the generated current of about 50 Hz.

The method of obtaining three-phase mechanical vibrations, on the basis of which the construction of the generator is created, ensures its full mechanical balance. All the main generator nodes can be operated for a long time, which allows to achieve greater resource.

Claims (2)

1. A linear alternator containing a stationary magnetic system with excitation windings placed on it and electrodes adjacent to channels with liquid metal, each of which contains measles, made in the form of a plate of electrically conductive material, characterized in three-phase current, said channels are connected hydraulically in parallel, and their number is a multiple of three, and the magnetic system is equipped with cores on which 0, there are windings that are secondary windings of the output transformer, and the primary winding of the transformer is an electrical circuit formed by the crust and electrodes closed between a liquid metal. five 2. The generator according to claim 1, characterized in that, in order to ensure stable operation with the number of channels greater than three, measles related to each phase are rigidly connected 0 between each other. Sources of information taken into account in the examination 1. A. Alekseev, et al. Diesel and carburetor electrical units and stations. Handbook, 1973. 2. USSR author's certificate in application number 2195847 / 24-07, cl. H 02 K 35/00, 1975. Aa Bb 10 X -t - - kv44yxX / x / x xy / tlJ Vfff y /////// /// FIG.