CN2244265Y

CN2244265Y - Three phase ac. generator

Info

Publication number: CN2244265Y
Application number: CN 95222070
Authority: CN
Inventors: 刘群利
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-09-26
Filing date: 1995-09-26
Publication date: 1997-01-01
Anticipated expiration: 2005-09-26

Abstract

The utility model relates to a three-phase AC generator which belongs to the improvement of the structure of generators. The utility model is characterized in that an end cover of a machine base is provided with a small-sized DC motor which drives a rotary brush to rotate by a gear wheel and a central rotating shaft; the end of a rotor is provided with a commutator, the excitation current of the rotor is energized to a rotor winding by a fixed brush, the rotary brush and the commutator, and the fixed brush, the rotary brush and the commutator are all arranged on the machine base. The rotation of the rotary brush makes the rotor winding generate revolving magnetic field, so the variation of the rotating speed of the rotor does not influence operating frequency; frequency is controlled by the rotating speed of the DC motor, and the frequency is irrelevant to the rotating speed of the rotor, so the rotating speed of the rotor can be changed according to variation of loads without influencing the operating frequency. When the utility model is used on a hydraulic turbine, a large quantity of energy can be saved.

Description

A kind of threephase alternator

The utility model relates to the alternating current generator technical field.

As everyone knows, the electricity that send in some power station is difficult to satisfy instructions for use when peak of power consumption, but during to the late into the night, the electric energy that send in the power station can not make full use of again, for this reason, people build waterpower accumulation of energy station, and at night, water pump utilizes unnecessary electric energy water to be extracted in the cistern of eminence, during to the high honeybee of electricity consumption, utilize the water in the cistern to promote hydraulic turbine generating again, adopt this method, need build waterpower accumulation of energy station, need great amount of manpower and financial resources, but also cause the loss of the energy.Why produce the problems referred to above, be because the present generator that uses, the frequency of its induced electromotive force is decided by the magnetic pole logarithm and the rotating speed thereof of generator, if the magnetic pole logarithm of generator is certain, and allocation is 50 hertz of power frequencies, so, the generator amature rotating speed can not become, so the rotating speed of generator can not change with the variation of load.

The purpose of this utility model provides a kind of generator amature and can improve with the variation of load or reduce rotating speed and come the supply load electric current, the constant threephase alternator of induced current power frequency that generator is produced.

The utility model is achieved in that a small-sized DC motor is housed in the support end cap, this motor shaft connects a pinion, at the end cap center one rotating shaft is set, place a rotary brush shell in this rotating shaft, the left end outside of this shell is socketed with gear wheel, pinion on this gear wheel and the motor shaft is meshing with each other, the right-hand member outside of this rotary brush shell is provided with the copper slip ring, be provided with fixed brush with the corresponding support of copper slip ring, with be provided with rotary brush in the corresponding rotary brush shell of copper slip ring, left end at rotor is provided with commutator, and commutator segment and rotary brush on this commutator touch.Socket rolling bearing on the end cap central rotating shaft, also socket rolling bearing on the central rotating shaft in the rotary brush shell rotates flexibly the rotary brush shell, and the lead-out wire of rotary brush links with corresponding copper slip ring respectively.

Below in conjunction with accompanying drawing structure of the present utility model, operation principle are described in detail:

Fig. 1 is the utility model structural representation

Fig. 2 is rotary brush and fixed brush structural representation

Fig. 3 is that rotary brush is motionless, magnetic field schematic diagram when rotor is motionless

Fig. 4 is that rotary brush is motionless, and during rotor rotation, schematic diagram is not rotated in magnetic field

Fig. 5 is that rotor is motionless, and during the rotary brush rotation, magnetic field also rotates schematic diagram

When Fig. 6 rotated in the same way for rotary brush and rotor, stator winding induced current diagram

Referring to accompanying drawing: the support 3 of this threephase alternator, the stator and the winding of stator core and winding 2 and the present threephase alternator that uses are basic identical, different is to be provided with a small-sized DC motor 16 in support end cap 13, this motor shaft connects a pinion 17, one rotating shaft 14 is set at the end cap center, place a rotary brush shell 10 in this rotating shaft 14, the left end outside of this shell 10 is socketed with gear wheel 12, pinion 17 on this gear wheel 12 and the motor shaft is meshing with each other, the right-hand member outside of this rotary brush shell 10 is provided with copper slip ring 9, be provided with fixed brush 7 with copper slip ring 9 corresponding supports 3, with be provided with rotary brush 5 in the copper slip ring 7 corresponding rotary brush shells 10, left end at rotor 1 is provided with commutator 4, and commutator segment and rotary brush on this commutator 4 touch.For end cap central rotating shaft 14 is rotated flexibly, socket rolling bearing 15 in rotating shaft 14, socket rolling bearing 11 in the rotating shaft 14 in rotary brush shell 10, for the DC excitation electric current being introduced in the winding of rotor 1, the lead-out wire 6 of rotary brush 5 links (seeing Fig. 1, Fig. 2) with corresponding copper slip ring 9 respectively, makes exciting current give winding excitation on the rotor 1 by the commutator segment on fixed brush lead-out wire 8, fixed brush 7, copper slip ring 9, rotary brush lead-out wire 6, rotary brush 5, the commutator 4.

The generation of this generator rotating magnetic field is described referring to accompanying drawing 3, Fig. 4, Fig. 5.The rotating magnetic field of this generator is finished jointly by rotary brush and commutator.

When rotary brush 5 was motionless, rotor 1 winding fed exciting current, and the hydraulic turbine drives generator amature 1 rotation.From accompanying drawing 3, Fig. 4 more as can be seen, when rotary brush 5 transfixions, no matter how soon generator amature 1 rotation has, the rotor field N utmost point and the S utmost point be invariant position all the time, at this moment, commutator only plays being transformed into a fixed magnetic field in the introduction of the direct current between the rotary brush rotor winding.

When generator amature 1 is motionless, and rotary brush 5 drags rotation through small-sized DC motor, from accompanying drawing 3, Fig. 5 more as can be seen, when the position of rotary brush 5 from Fig. 3 rotates to position among Fig. 5, the rotor field N utmost point and the S the utmost point also position from Fig. 3 rotate to position among Fig. 5, so the main effect of rotary brush in this generator is with the mode of exciting current through rotation, converts rotating magnetic field to through commutator and rotor winding.

Referring to Fig. 6, the rotor winding of one four this alternating current generator of the utmost point, when feeding exciting current generation main field, rotary brush is also dragged by a small-sized DC motor, and rotate in the direction of the clock by the speed of 1500 commentaries on classics/platforms, rotor is also driven by the hydraulic turbine and rotates by 1500 rev/mins speed up time direction, and the stator winding cutting magnetic line produces alternating current.

The frequency of this alternating current generator is control like this, the frequency of stator winding induced electromotive force equals the speed of stator winding cutting magnetic line, and the speed of stator winding cutting magnetic line also equals the rotary speed of rotor main field, and the rotating speed of rotor main field is to be controlled by the speed of rotary brush, simultaneously, the speed of rotary brush is dragged by small-sized DC motor, so, as long as controlled the rotating speed of small-sized DC motor, just equaled to control the faradic frequency of generator.

The rotor winding of this alternating current generator is except feeding exciting current, and the rotor winding also can produce induced current, and this faradic direction and rotor speed have direct relation.

When generator amature rotating speed during less than the armature field rotating speed, rotor winding and armature field have just had relative motion, make the rotor winding produce induced current, this inductive current direction is opposite with the exciting current direction, the described exciting current that just reduced, also equal to have weakened main field, so, stator winding also will reduce because of the induced electromotive force that cutting magnetic line produces.

When the generator amature rotating speed equaled the armature field rotating speed, because of rotor winding and armature field are provided with relative motion, so the rotor winding just can not produce induced current, exciting current just can not become so, and the main field magnetic flux can not become yet.

When the generator amature rotating speed is higher than the armature field rotating speed, because of rotor winding and armature field have had relative motion, the rotor winding can produce induced current, this inductive current direction is identical with the exciting current direction, so, just increased exciting current, also just strengthened main field, so, the induced electromotive force of stator winding generation also will increase.

So the generator amature rotating speed is fast, the electric weight of generation is many, and the generator amature rotating speed is slow, and the electric weight of generation is few, and ac frequency is constant.

The difference of this alternating current generator and the technology small-sized DC motor that has been many, commutator and rotary brush; Frequency is controlled by the rotating speed of small-sized DC motor, and irrelevant with rotor speed; The rotor winding can be because of the speed of rotor speed, and the size of regulating exciting current automatically.

The utility model has the advantages that, can save mass energy, with reasonable energy utilization; The induced-current frequency quality height that produces; Generator amature can be carried with the variation of load Height or reduction rotating speed, the offered load electric current, but the induced-current frequency that generator produces is not Can become, can keep all the time 50 hertz of power frequencies.

Claims

1, a kind of threephase alternator, organic block, stator, rotor, end cap, it is characterized in that: a small-sized DC motor is housed in the support end cap, this motor shaft connects a pinion, at the end cap center one rotating shaft is set, place a rotary brush shell in this rotating shaft, the left end outside of this shell is socketed with gear wheel, pinion on this gear wheel and the motor shaft is meshing with each other, the right-hand member of this rotary brush shell outside is provided with the copper slip ring, is provided with fixed brush with the corresponding support of copper slip ring, and is provided with rotary brush in the corresponding rotary brush shell of copper slip ring, left end at rotor is provided with commutator, and commutator segment and rotary brush on this commutator touch.

2, threephase alternator as claimed in claim 1 is characterized in that, the central rotating shaft in the socket rolling bearing on the end cap central rotating shaft, rotary brush shell is the socket rolling bearing also.

3, threephase alternator as claimed in claim 1 is characterized in that, the lead-out wire of rotary brush links with corresponding copper slip ring respectively.