CN2302615Y

CN2302615Y - Self-exciting generator

Info

Publication number: CN2302615Y
Application number: CN 97218030
Authority: CN
Inventors: 袁建江
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-12
Filing date: 1997-06-12
Publication date: 1998-12-30
Anticipated expiration: 2007-06-12

Abstract

The utility model relates to a self-exciting generator. An output terminal a of one phase winding L1 in a three-phase output winding of the utility model is connected with an output terminal b of the other phase winding L2 through a normally closed contact J1 of a relay and a primary coil e 1 of a transformer B. One end of a coil J of the relay is connected with an output terminal a of the winding L1. The other end is connected with a ground potential. A secondary coil e 2 of the transformer B is connected with a rectification circuit. An output terminal of the rectification circuit is connected with an exciting winding L4 of the generator, which forms a closed loop. The utility model has the advantages that the transformer is connected in series between the output winding and the exciting winding, and weak voltage generated in the windings is raised when the generator starts to run, which can ensure that the generator can be automatically excited.

Description

From the excitation type generator

The utility model relates to generator, refers in particular to a kind of from the excitation type generator.

The exciting method of generator has two kinds, i.e. separated exciting and auto-excitation type.Separately excited generator need give generator excitatory by external power source when generating, just provide electric current to the generator field winding, make to produce magnetic field in the field winding, during rotor rotation by storage battery or external power supply, the cutting magnetic line generating, this generator working method is called separated exciting.This generator must have external power source in use, and this has just limited its scope of application.

Also has a kind of generator promptly from the excitation type generator, the iron core of the iron core of the stator winding of this generator or rotor winding adopts the higher ferrimagnet of remanent magnetism rate to manufacture, that is to say that electricity generator stator core or rotor core are equivalent to a permanent magnet, this generator does not just need external power supply when generating, but the remanent magnetism magnetic field generation in the dependence generator iron core, present from the excitation type generator, its principle schematic as shown in Figure 1, winding L 1, L2, L3 is the three-phase output winding of generator, L4 is the generator field winding, its operation principle is: when generator amature rotates under prime mover drags, the magnetic line of force in rotor cutting remanent magnetism magnetic field, make generator output winding L 1, L2, produce alternating current among the L3, electric current is through two utmost point D1, D2, D3, D4, D5, flow into field winding L4 after the rectifier bridge rectification that D6 forms, field winding L4 has just produced current field, this magnetic field superposition is on the original remanent magnetism of generator magnetic field, the generator internal magnetic field is strengthened, and then make output winding L 1, L2, the electric current that L3 produces strengthens, after this electric current flows into L4, the magnetic field that field winding L4 is produced is strengthened, go round and begin again, the generating of formation auto-excitation type, but show in practice, this generator self-excitation state usually can not set up, this be because, remanent magnetism magnetic field in the generator iron core is very weak, during the firm entry into service of generator, the voltage that the output winding utilizes remanent magnetism magnetic field to produce is very low, even phase voltage generally is no more than 0.6V, so low voltage almost can not make among the field winding L4 and produce electric current, just can not make field winding produce magnetic field, thereby the self-excitation mode can not set up yet.

It is a kind of from the excitation type generator that the purpose of this utility model is to provide, between its output winding and field winding, be in series with step-up transformer, the weak voltage that produces in the output winding during with the generator entry into service is boosted, thereby the voltage after will boosting again is carried in and guarantees on the field winding that the electric current in the field winding is enough strong, make field winding produce high-intensity magnetic field, guarantee that generator can self-excitation.

The purpose of this utility model is achieved in that

A kind of from the excitation type generator, including stator, rotor, output winding, field winding, output winding is three phase windings, be to constitute by three single-phase winding L 1, L2, L3 Y-connections, three output a, the b of winding L 1, L2, L3, c are connected with diode D1, D2, the positive pole of D3 in the three-phase bridge full-wave rectifier respectively, and the negative pole of diode D1, D2, D3 all passes through field winding L4 earthing potential; Winding L 1, L2, three output a of L3, b, c also respectively with diode D4, D5, the negative pole of D6 connects, diode D4, D5, the positive pole of D6 all is connected with earth potential, it is characterized in that: the output a of the phase winding L1 in the generator three-phase output winding is by the normally-closed contact J1 of a relay, the primary coil e1 of transformer B, be connected with the output b of another phase winding L2, like this, winding L 1, relay normally-closed contact J1, the primary coil e1 of transformer B, winding L 2, be connected into the closed-loop path mutually, coil J one end of described relay is connected with the output a of winding L 1, other end earthing potential, the secondary coil e2 of transformer B is connected with a rectification circuit, and the output of this rectification circuit and described generator field winding L4 connect into the closed-loop path.

The positive beneficial effect of the utility model is:

1, utilizes remanent magnetism magnetic field generation in the generator iron core, do not need the external power source excitation, thereby do not receive the non-transformer restriction when using.

2, be in series with step-up transformer between output winding and field winding, the voltage that will be added in the field winding two ends raises, and guarantees that field winding can produce enough strong magnetic field, has guaranteed that generator enters the self-excitation state in the function that just begins to generate electricity.

Now in conjunction with the accompanying drawings the utility model is further described as follows with preferred embodiment:

Fig. 1 is existing self excited generator schematic diagram.

Fig. 2 is the utility model one embodiment circuit theory diagrams.

Fig. 3 is another embodiment circuit theory diagrams of the utility model.

Referring to Fig. 2, operation principle is as follows: generator amature drags down at prime mover and rotates, the magnetic field that rotor cutting generator iron core remanent magnetism produces, make three-phase output winding L 1, L2, L3 produces alternating voltage, L1, the output a of L2, phase voltage generally has only 0.6V between b, this moment is very weak by the electric current that a point flows into relay coil J, the normally-closed contact J1 closure of relay, a, phase voltage between b is carried on the former limit e1 of transformer B, B boosts through transformer, by transformer B secondary e2 output 7V left and right sides alternating current, this alternating current is through diode D7, D8, D9, after the rectification circuit rectification that D10 forms, supply with field winding L4, make and produce among the L4 than heavy current, the current field that produces among the L4 also can corresponding grow, this magnetic field is added on the original remanent magnetism of the generator magnetic field, make generator internal magnetic field grow, thereby make output winding L 1, L2, electrorheological is big among the L3, this electric current makes the magnetic field grow that produces in the field winding again, go round and begin again, generator just self-excitation gets up, after electrorheological in the generator output winding L 1 is big, flow into the electric current grow of relay coil J by a point, relay normally-closed contact J1 opens, transformer B quits work, because this moment, output was around L1, L2, the electric current that produces among the L3 is very big, a, the phase voltage of b end is very high, considerably beyond the incipient 0.6V of generating, so need not re-use transformer B boosts, and will export winding L 1, L2, produce electric current among the L3 and pass through D1, D2, D3, D4, D5, directly supplying with field winding L4 after the D6 rectification gets final product, Fig. 3 is another preferred embodiment of the utility model figure, the secondary coil e2 of its transformer B adopts centre cap ground connection, so only use D11, two diodes of D12 just can be finished the full-wave rectification task, than circuit shown in Figure 2, can save two diodes, therefore more economical material benefit.

Claims

1, a kind of from the excitation type generator, including stator, rotor, output winding, field winding, output winding is three phase windings, be to constitute by three single-phase winding L 1, L2, L3 Y-connections, three output a, the b of winding L 1, L2, L3, c are connected with diode D1, D2, the positive pole of D3 in the three-phase bridge full-wave rectifier respectively, and the negative pole of diode D1, D2, D3 all passes through field winding L4 earthing potential; Winding L 1, L2, three output a of L3, b, c also respectively with diode D4, D5, the negative pole of D6 connects, diode D4, D5, the positive pole of D6 all is connected with earth potential, it is characterized in that: the output a of the phase winding L1 in the generator three-phase output winding is by the normally-closed contact J1 of a relay, the primary coil e1 of transformer B, be connected with the output b of another phase winding L2, like this, winding L 1, relay normally-closed contact J1, the primary coil e1 of transformer B, winding L 2, be connected into the closed-loop path mutually, coil J one end of described relay is connected with the output a of winding L 1, other end earthing potential, the secondary coil e2 of transformer B is connected with a rectification circuit, and the output of this rectification circuit and described generator field winding L4 connect into the closed-loop path.