CN86106350A

CN86106350A - Three phase ac generator gang brushfree magnetizing apparatus

Info

Publication number: CN86106350A
Application number: CN 86106350
Authority: CN
Inventors: 郭伟华
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-10-31
Filing date: 1986-10-31
Publication date: 1987-12-16

Abstract

Three phase ac generator gang brushfree magnetizing apparatus is made of AC exciter, excitation generator.It is excitation generator excitation that AC exciter is sent three-phase alternating current.In stator, produce a rotating magnetic field.The essence of utilizing rotating magnetic field is that the continuous variation rather than the magnetic line of force of magnetic line of force intensity, direction is subjected to displacement.Send into coaxial with it generator amature with rotor winding cutting magnetic line generation exciting current and carry out excitation.The present invention can make the gang brushfree magnetizing apparatus of large-scale thermal power machine.Simple in structure, required maintenance is little.

Description

Three phase ac generator gang brushfree magnetizing apparatus

This device provides a kind of novel alternating current generator excitation unit.Existing is to introduce generator amature with brush with alternating current generator after rectification to carry out excitation.This installs the coaxial excitation system of described alternating current generator, has cancelled other all brushes except that needing for this device AC exciter excitation the brush.As to adopt feedback system be that this device excitation then can be cancelled whole brushes.Compare with existing exciter, owing to simplify the structure, cancelled the brush of maintenance maximum, thus have stable and reliable for performance, output voltage is steady, the little and efficient advantages of higher of maintenance.

Be described in detail below in conjunction with the principle of accompanying drawing this device excitation generator.

Fig. 1 is the part of excitation generator stator and rotor core.(1) is rotor core.In stator core (2), be wound with A, B, C three phase windings.When passing to three-phase current, produce one by the continuously shifting magnetic field of tooth A to the C direction from macroscopic view.We are referred to as " rotating magnetic field " in electromagnetism.But from microcosmic, be example with the A tooth of stator core (2), just the continuous variation rather than the magnetic line of force of magnetic field intensity, direction are subjected to displacement.This point is confirmed by experiment.If a conductor (3) is put in strength in this magnetic field, and allow conductor (3) follow the tracks of this high-intensity magnetic field to move, because the magnetic line of force is not subjected to displacement, conductor (3) is moved to tooth C direction by tooth A with high-intensity magnetic field, has so just produced relative motion.Equate that as the spacing of tooth A, B, C supply voltage, frequency are also stable, the translational speed of conductor (3) also is a constant so, and also is constant by the formed field intensity of locating at conductor (3) of power supply.According to formula E=B.L.V, produce the induced potential of a numerical stability at conductor (3) two ends.

Fig. 2 is the schematic diagram of this device.(4) be stator winding.Fig. 3 is the three-dimensional cutaway view of figure two.Its structure is with to exchange threephase generator similar.But difference is: the latter utilizes the rotation of rotor field to send three-phase alternating current, and this device then is to come excitation to produce direct current in the rotor winding with three-phase alternating current.Yin Ben device and generator coaxle can directly be introduced generator amature with direct current.

The excitation of this device be with one with the coaxial small-sized threephase generator that exchanges of this device as AC exciter.Its rotor is introduced DC excitation and adjustment, Control current by brush (9); As shown in Figure 4.(5) be AC exciter, (6) are brushless excitation generator, and (7) are generator, and (8) are steam turbine, and (9) are the slip rings for the AC exciter excitation.

The electricity that the also available generator of this device sends carries out feedback excitation and omits AC exciter, but less stable.

The same with generator, generator amature is that the then excitation generator stator winding of several utmost points is also made several utmost points.

Claims

1, brushless excitation generator of forming by rotor core (1), stator core (2), rotor winding (3) and stator winding (4), it is characterized in that the formed rotating magnetic field of rotor and stator rotates synchronously, and rotor winding (3) is all the time at magnetic field intensity maximum place.

2, by the brushless excitation generator of claim 1 regulation, it is characterized in that a coaxial interchange threephase generator is the brushless excitation generator excitation.

3, by the brushless excitation generator of claim 1 regulation, the essence that it is characterized in that utilizing the rotating magnetic field that stator winding produced when feeding three-phase alternating current be stator point magnetic field intensity be the continuous variation of size and direction and the magnetic line of force thereupon rotation take place and rotor (1) with the displacement of speed.