CN219477818U - Brushless excitation hydraulic generator with auxiliary winding - Google Patents

Abstract

The application discloses take brushless excitation hydraulic generator of auxiliary winding, including rotor, stator and exciter, be equipped with stator winding on the stator, be equipped with rotor winding on the rotor still be provided with the auxiliary winding on the stator, the auxiliary winding is configured to the induction alternating current potential and carries to the exciter, the exciter is used for with the potential conversion is direct current potential carries for rotor winding, stator winding induction alternating current output electric wire netting. The auxiliary winding is provided with a coil inserting groove matched with the main machine stator winding so as to realize clockwise rotation or anticlockwise rotation of the hydroelectric generating set. The brushless excitation hydraulic generator with the auxiliary winding has the advantages of simple excitation system and stable and reliable excitation voltage.

Description

Brushless excitation hydraulic generator with auxiliary winding

Technical Field

The application relates to the technical field of hydraulic generators, in particular to a brushless excitation hydraulic generator with an auxiliary winding.

Background

At present, the excitation modes adopted by the generator mainly comprise two typical modes of static silicon controlled excitation and brushless excitation. The static silicon controlled excitation mode is that the generator and the excitation system are two independent systems, the response speed of the excitation system is high, and the excitation system is commonly used in hydropower products. However, the current for exciting the static silicon controlled excitation generator is introduced by the electric brush and the collector ring, so that the problem of spark and carbon powder pollution of the collector ring exists, and on the other hand, because the exciting current is provided by the exciting system, the exciting transformer and the exciting cabinet are required to be configured in the power station, and the construction of the exciting system is complex and the cost is high.

The exciting current of the brushless excitation mode generator is provided by an exciter, so that the problem of spark and carbon powder pollution of a collecting ring is thoroughly solved, but the stator power of the exciter is provided by an excitation transformer at the end of the generator, the exciting voltage is factory alternating current, and the voltage is greatly influenced by power grid fluctuation.

Disclosure of Invention

In order to solve the technical problems, the application provides a brushless excitation hydraulic generator with an auxiliary winding, which has the advantages of simple excitation system and stable and reliable excitation voltage.

The utility model provides a take brushless excitation hydraulic generator of auxiliary winding, including host computer rotor, host computer stator and brushless exciter, be equipped with host computer stator winding on the host computer stator, be equipped with host computer rotor winding on the host computer rotor still be provided with the auxiliary winding on the host computer stator, the auxiliary winding is configured to the response alternating current potential and carries for the exciter, the exciter is used for with the potential conversion is direct current potential carries for host computer rotor winding, host computer stator winding induces alternating current output electric wire netting, wherein, the auxiliary winding be provided with host computer stator winding assorted rule groove to realize that hydraulic generator set clockwise rotation or anticlockwise rotation.

By adopting the technical scheme, the auxiliary winding inducts and outputs three-phase alternating current potential to the exciter, the exciter transmits the potential to the main machine rotor winding, and the main machine stator winding inducts three-phase symmetrical alternating current potential.

Further, the exciter comprises an exciting stator and an exciting rotor, an exciting stator winding is arranged on the exciting stator, an exciting rotor winding is arranged on the exciting rotor, and an AVR regulator is connected between the auxiliary winding and the exciting stator winding.

By adopting the technical scheme, the three-phase alternating current potential which is inductively output by the auxiliary winding is rectified by the AVR regulator and is transmitted to the exciting stator winding to be used as a direct current power supply of the exciter.

In a further scheme, a three-phase rectifier bridge is connected between the exciting rotor winding and the main machine rotor winding.

By adopting the technical scheme, the exciting rotor winding induces three-phase symmetrical potential to be transmitted to the three-phase rectifier bridge, and the three-phase symmetrical potential is rectified by the rotary rectifier disc to change alternating current potential into direct current potential to the main machine rotor winding to supply excitation to the magnetic pole exciting winding of the generator.

Further, the exciting rotor is connected with the main machine rotor through an elastic disc and half coupling, the generator further comprises a ventilation pipe, and the ventilation pipe is connected with an adjusting mechanism to realize adjustable connection of the ventilation pipe.

By adopting the technical scheme, the excitation rotor and the main machine rotor are reliably connected, and the performance is stable. The ventilation pipe can realize ventilation and heat dissipation of the host machine, the working performance of the whole machine is guaranteed, and the ventilation pipe can be better adapted to pits and is adjusted and fixedly installed by the adjusting mechanism.

Further, the exciter is disposed at an end of the generator that is not driven.

By adopting the technical scheme, the axial length of the unit can be effectively shortened, and the stability of the unit is improved.

Further, the number of turns of each phase of the secondary winding is 3 to 5.

By adopting the technical scheme, the positions of the slots in which the auxiliary windings are positioned are different from those of the stator windings, the magnetic densities are also different, and the distribution coefficient and the short-distance coefficient are different from those of the normal stator windings, so that the number of turns of the auxiliary windings has great influence on the output voltage. The number of turns of each phase of the auxiliary winding is set to 3-5, and the vibration and noise of the product are relatively small.

Further, the number of turns of each phase of the auxiliary winding is 4.

By adopting the technical scheme, the number of turns of each phase of the auxiliary winding is 4, the number of turns of each pole of each phase is 0.5, the pitch is 1-15, and the vibration and noise of the product are relatively small, so that the requirement of AVR on the voltage range of the auxiliary winding wire can be met. Each phase is provided with a group of standby windings, so that normal operation can be ensured not to be influenced during faults.

Further, the end of the secondary winding coil is provided with a fixing device.

By adopting the technical scheme, the problems that the span of the secondary winding coil is large and the rigidity of the end parts is weak are solved, the end hoops are respectively arranged at the two end parts, the secondary winding is bound on the end hoops by using the conformal material and the polyester rope, and the end hoops are fixed, so that the secondary winding coil is more stable and reliable.

Further, the main machine stator is provided with a stator slot, the auxiliary winding is arranged in the stator slot, the auxiliary winding comprises an installation part arranged in the stator slot and a connection part arranged outside the stator slot, the installation part is flat, and the connection part is columnar.

By adopting the technical scheme, the mounting part is made into a flat shape, the width direction of the mounting part is close to the width of the stator slot, and the mounting part is convenient to be placed at the bottom of the stator slot of the generator. The connecting part is made into a column shape, so that the connection and the fixation are convenient, and the occupied space is small.

Further, the insulation structure of the installation part is sequentially provided with a glass ribbon, a mica tape and a glass cloth plate from outside to inside.

By adopting the technical scheme, the insulating performance of the installation part positioned in the stator groove is better.

In summary, the present application has at least one of the following beneficial technical effects:

1. the brushless excitation hydraulic generator with the auxiliary winding has the advantages that the auxiliary winding inducts and outputs three-phase alternating current potential, the three-phase alternating current potential is rectified by the AVR regulator, and the three-phase alternating current potential is transmitted to a brushless exciter stator to serve as a direct current power supply of an exciter. The armature of the exciter rotor induces three-phase symmetrical potential to be transmitted to the three-phase rectifier bridge, and the three-phase symmetrical potential is rectified by the rotary rectifying disc to change alternating current potential into direct current potential to be supplied to the exciting windings of the magnetic poles of the generator for excitation, and the stator windings of the generator induce the three-phase symmetrical potential. The excitation system is simple, and the excitation voltage is stable and reliable.

2. The brushless excitation hydraulic generator with the auxiliary winding effectively shortens the axial length of the unit and improves the stability of the unit.

3. The brushless excitation hydraulic generator with the auxiliary winding has reasonable design of turns of each phase of the auxiliary winding, can meet the requirement of AVR on the voltage range of the auxiliary winding wire, and has relatively small vibration and noise.

4. The brushless excitation hydraulic generator with the auxiliary winding does not need equipment such as an excitation transformer, and the like, and the capacity-increasing transformation power station has the advantages of low construction cost, simple excitation system, convenient operation and maintenance and high automation degree.

Drawings

FIG. 1 is a schematic diagram of a brushless excitation hydro-generator with secondary windings of the present application;

FIG. 2 is a schematic partial cross-sectional view of a brushless excitation hydro-generator with secondary windings of the present application;

FIG. 3 is a schematic view in partial cross-section of A-A of FIG. 1;

FIG. 4 is a schematic structural view of the stator, stator winding and secondary winding assembly of the present application;

FIG. 5 is a schematic sectional structure of a mounting portion of the sub-winding in the stator slot;

FIG. 6 is a schematic cross-sectional structure of a connection portion of the secondary winding outside the stator slot;

fig. 7 is a schematic diagram of excitation electricity of a brushless excitation hydro-generator with secondary windings of the present application.

Reference numerals:

1. a main shaft; 21. radial thrust bearing; 22. a radial bearing; 3. a frame; 31. a ventilation pipe; 32. a support post; 33. an adjusting mechanism; 4. a flywheel; 5. an exciter; 51. exciting the stator winding; 52. exciting the rotor winding; 53. an AVR regulator; 6. a bottom plate; 7. a main machine rotor; 71. a main machine rotor winding; 72. a three-phase rectifier bridge; 8. a main machine stator; 81. a main machine stator winding; 82. a main machine stator winding outlet terminal; 83. stator winding end hoops; 84. a stator core; 85. a bracket; 9. an auxiliary winding; 91. a secondary winding junction box; 92. an auxiliary winding end band; 93. a glass ribbon; 94. a mica tape; 95. an epoxy glass cloth plate; 96. enamelled copper wire.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present application, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

Referring to fig. 1, a structure of a brushless excitation hydro-generator with a secondary winding is disclosed, which comprises a base plate 6 fixed on the ground, a frame 3 mounted on the base plate 6, a radial thrust bearing 21, a radial bearing 22 and an exciter 5, wherein the exciter 5 is a brushless exciter 5. An exciter stator and an exciter rotor are arranged in the exciter 5, the exciter stator is provided with an exciter stator winding 51, the exciter rotor is provided with an exciter rotor winding 52, the exciter 5 is arranged at the end part of the non-driving end of the generator, the frame 3 is arranged between the radial thrust bearing 21 and the radial bearing 22, and the radial thrust bearing 21 and the radial bearing 22 are fixed on the main machine stator 8. The weight of the main shaft system is borne by the radial thrust bearing 21 and the radial bearing 22, and the radial thrust bearing 21 and the radial bearing 22 play roles in bearing force and rotary lubrication and cooling. The radial thrust bearing 21 and the radial bearing 22 are internally provided with a main shaft 1, the connecting end of the main shaft 1 and the exciter 5 is provided with a flywheel 4, and the flywheel 4 is positioned between the radial bearing 22 and the exciter 5. A ventilation pipe 31 is connected below the frame 3 and is used for ventilating and radiating the main machine stator 8 and the main machine rotor 7 in the frame 3.

Referring to fig. 2, a frame 3 is fixed on a main stator 8, a secondary winding 9 and a main stator winding 81 are wound on the main stator 8, a main rotor winding 71 is wound on a main rotor 7, and an exciting rotor and the main rotor 7 are connected by an elastic disc and a half coupling. The frame 3 is provided with a secondary winding junction box 91, and the outlet terminal of the main stator winding 81 is disposed below the secondary winding junction box 91 from the viewpoint of safety.

The position of the stator slot where the auxiliary winding 9 is positioned is different from that of the main machine stator winding 81, the magnetic density is also different, the distribution coefficient and the short-distance coefficient are different from those of the normal stator winding, the auxiliary winding 9 is arranged in the high-voltage stator, and the number of turns of the auxiliary winding 9 greatly affects the output voltage. Taking the normal stator voltage of the generator as 6300V as an example, the detailed calculation of the number of turns of the auxiliary winding 9 is shown in formulas (1), (2) and (3):

(1) AVR requirements for secondary windings:

a) And (3) grafting: and Y-type.

b) The line voltage range is 200-260V, 220V is taken, and the phase voltage is calculated to be 127V.

(2) The number of turns per phase of the secondary winding in series is calculated:

wherein:-magnetic field waveform coefficient, 0.9687;

-the secondary winding phase voltage is 127V;

f-rated frequency, 50Hz;

-16.06 x 106Mx per pole flux at no load rated voltage;

kw-the winding coefficient of the secondary winding is 0.95385.

(3) Taking wpair=4, again accounting the line voltage to 243V, and meeting the requirement of AVR on the range of the line voltage of the secondary winding. The number of turns per phase of the secondary winding 9 may be 3-5, depending on the specific parameters.

Referring to fig. 3, the ventilation pipe 31 is an elbow, and in order to ensure the strength and stability of the ventilation pipe 31, a support post 32 is supported below the ventilation pipe 31, in order to ensure that the ventilation pipe 31 is well connected with the host stator 8 and the power station tunnel, the stability between the ventilation pipe 31 and the tunnel is realized, and an adjusting mechanism 33 is arranged between the support post 32 and the ventilation pipe 31, so that the position relationship and stability between the ventilation pipe 31 and the support post 32 can be adjusted, the connection reliability of the ventilation pipe 31 is ensured, and the optimal ventilation effect is realized. The air intake direction is shown by the solid arrow in the figure, and the air outlet is from below the main stator 8 and outwards along the ventilation pipe 31, as shown by the broken arrow in the figure.

Referring to fig. 4, the structure of the assembly of the main stator 8, main stator winding 81 and auxiliary winding 9 is shown. In order to avoid that the outgoing line of the auxiliary winding 9 spans the end part of the stator winding, the auxiliary winding 9 is embedded at the bottom of the stator slot, and the main machine stator winding 81 is closely attached to the auxiliary winding 9 and arranged in the stator slot. The secondary winding 9 has larger coil span and weaker end rigidity, so that a secondary winding end hoop 92 is respectively arranged at two end positions of the secondary winding 9 coil, the secondary winding 9 is bound on the secondary winding end hoop 92 by using a conformal material and polyester ropes, and the secondary winding end hoop 92 is fixed on a bracket 85 on the main machine stator 8. Similarly, the ends of the main machine stator winding 81 are secured to a bracket 85 by stator winding end clamps 83. The auxiliary winding 9 is provided with a wire embedding groove matched with the main machine stator winding 9, and the direction of the auxiliary winding 9 in the wire embedding groove is adjusted so as to realize clockwise rotation or anticlockwise rotation of the hydroelectric generating set. An adjusting component is arranged between the main machine stator winding 81 and the auxiliary winding 9, so that the positions of coil inserting grooves of the main machine stator winding 81 and the auxiliary winding 9 can be changed, and different turning directions of clockwise rotation and anticlockwise rotation of the hydroelectric generating set can be realized.

Referring to fig. 5, a sectional structure of the mounting portion of the secondary winding 9 in the stator slot is shown. The enameled wire is clamped up and down by an epoxy glass cloth plate 95 to be tiled, then the epoxy powder mica tape 94 is folded and wrapped in half, finally the glass fiber tape 93 is folded and flattened after wrapping, the width direction is close to the width of the groove, and the enameled wire is placed at the bottom of the stator groove of the generator.

Referring to fig. 6, a cross-sectional structure of the connection portion of the secondary winding 9 outside the stator slot is shown. The insulation structure of the straight line part outside the auxiliary winding 9 end part and the stator slot: round copper wires are orderly arranged, the half-stacked epoxy powder mica tape 94 is wrapped, and finally the half-stacked glass fiber tape 93 is wrapped.

Referring to fig. 7, a schematic diagram of the excitation electricity of a brushless excitation hydro-generator with secondary windings is shown. An AVR regulator 53 is connected between the auxiliary winding 9 and the field stator winding 51, and a three-phase rectifier bridge 72 is connected between the field rotor winding 52 and the main rotor winding 71.

The auxiliary winding 9 inducts and outputs three-phase alternating current potential, and the three-phase alternating current potential is rectified by the AVR regulator 53 and is transmitted to the brushless exciter 5 to excite the stator winding 51 to serve as a direct current power supply of the exciter 5. The three-phase symmetrical potential induced by the exciting rotor winding 52 is transmitted to the three-phase rectifier bridge 72, and is rectified by the rotary rectifying disc, so that the alternating current potential is changed into the direct current potential to be supplied to the generator main machine rotor winding 71 for excitation, and the three-phase symmetrical potential is induced by the generator main machine stator winding 81.

The main technical parameters of electromagnetic design of the hydraulic generator and the brushless exciter are shown in table 1 through calculation and analysis of electromagnetic design scheme.

TABLE 1 main technical parameters

The generator main machine rotor 7 and the brushless exciter 5 rotor are coupled and connected, at the moment, the AVR regulator 53 is not connected, the direct current power supply is used for supplying power to the brushless exciter 5 stator, the motor drags the generator to the rated rotation speed, and the voltage value of the output line of the auxiliary winding 9 is measured, and the voltage value is shown in the table 2. From the measurement results, it can be seen that the line voltage induced by the secondary winding 9 meets the requirements. (AVR requirement for auxiliary winding: line voltage range 220-260V)

TABLE 2 auxiliary winding output line voltage values

Phase of	Line voltage (V)
		1U1-1V1	266.1
1V1-1W1	247.4
		1W1-1U1	257.5
2U1-2V1	266.1
		2V1-2W1	247.6
2W1-2U1	257.7

The generator auxiliary winding 9 is connected to the AVR regulator 53, the AVR regulator 53 is connected with the brushless exciter 5 exciting stator winding 51, the generator rotor is connected with the brushless exciter 5 exciting rotor in a coupling mode and connected with the brushless exciter 5 exciting rotor, the motor drags the generator to the rated rotating speed, the voltage build-up condition of the generator main machine stator winding 81 and the auxiliary winding 9 is observed, the oscillograph is used for monitoring the waveform of the voltage alternating current signal, and the generator stator voltage, the brushless exciter 5 voltage and the current value are measured, and the table 3 is shown.

Table 3 no-load test data

Conclusion of the test: the data measured by the no-load test show that the no-load test of the generator has normal voltage build-up, and the oscillograph shows that the periods of two groups of voltage alternating current signals of the stator winding and the auxiliary winding of the generator are completely consistent.

The brushless excitation hydraulic generator has no current collector and carbon brush component, so that the generator has no carbon brush contact spark and carbon powder pollution during operation. The generator stator is provided with a secondary winding 9 which is specially used for providing exciting power for the brushless exciter 5 stator, and the power supply is independent and is not influenced by voltage fluctuation of a power system. The power station does not need to be provided with equipment such as an excitation transformer, and the like, and the excitation system is simple and has low construction cost.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present utility model, and various changes, modifications, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model, which are to be defined by the appended claims.

Claims (10)

1. The brushless excitation hydraulic generator with the auxiliary winding comprises a main machine rotor (7), a main machine stator (8) and a brushless exciter (5), wherein a main machine stator winding (81) is arranged on the main machine stator (8), and a main machine rotor winding (71) is arranged on the main machine rotor (7), and the brushless excitation hydraulic generator is characterized in that the auxiliary winding (9) is further arranged on the main machine stator (8), the auxiliary winding (9) is configured to induce alternating current potential and is transmitted to the exciter (5), the exciter (5) is used for converting the potential into direct current potential and transmitting the direct current potential to the main machine rotor winding (71), the main machine stator winding (81) induces an alternating current output power grid, and the auxiliary winding (9) is provided with a rule groove matched with the main machine stator winding (81) so as to realize clockwise rotation or anticlockwise rotation of the hydraulic generator set.

2. The brushless excitation hydro-generator with auxiliary windings according to claim 1, characterized in that the exciter (5) comprises an excitation stator and an excitation rotor, the excitation stator is provided with an excitation stator winding (51), the excitation rotor is provided with an excitation rotor winding (52), and an AVR regulator (53) is connected between the auxiliary winding (9) and the excitation stator winding (51).

3. The brushless excitation hydro-generator with secondary windings as defined in claim 2 wherein a three-phase rectifier bridge (72) is connected between the excitation rotor winding (52) and the main machine rotor winding (71).

4. A brushless excitation hydro-generator with a secondary winding as defined in claim 2 wherein said excitation rotor and said main machine rotor (7) are connected by means of a flexible disc plus half coupling, said generator further comprising a ventilation duct connected with an adjustment mechanism to effect an adjustable connection of the ventilation duct.

5. A brushless excitation hydro-generator with a secondary winding as defined in claim 1 wherein the exciter (5) is provided at the end of the generator that is not drive end.

6. A brushless excitation hydro-generator with a secondary winding as defined in claim 1 wherein the secondary winding (9) has 3 to 5 turns per phase.

7. A brushless excitation hydro-generator with a secondary winding as defined in claim 6 wherein the secondary winding (9) has 4 turns per phase.

8. A brushless excitation hydro-generator with a secondary winding as defined in claim 1 wherein the ends of the secondary winding (9) coils are provided with fixing means.

9. The brushless excitation hydro-generator with a secondary winding as defined in claim 1 wherein the main machine stator (8) is provided with stator slots, the secondary winding (9) being disposed in the stator slots, the secondary winding (9) including a mounting portion disposed in the stator slots and a connecting portion disposed outside the stator slots, the mounting portion being flat and the connecting portion being columnar.

10. The brushless excitation hydro-generator with a secondary winding as defined in claim 9 wherein the insulating structure of the mounting portion is provided as a glass ribbon (93), a mica tape (94) and a glass cloth plate in that order from the outside to the inside.