CN111313578A

CN111313578A - Stator module of hybrid excitation generator

Info

Publication number: CN111313578A
Application number: CN202010316342.XA
Authority: CN
Inventors: 吴海鹰; 薛佳运
Original assignee: Yikun Power Technology Shanghai Co ltd
Current assignee: Yikun Power Technology Shanghai Co ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-06-19

Abstract

The invention discloses a stator module of a hybrid excitation generator, which comprises an electric excitation winding assembly, an electric excitation stator core, a stator insulation end plate, a stator non-magnetic tooth space section, a non-magnetic separation plate, a main stator core and an armature; the iron core is formed by axially splicing a main stator iron core and an electrically excited stator iron core, a non-magnetic-conductive magnetic isolation plate is arranged between the two iron cores, and an electrically excited winding simultaneously penetrates through the main stator iron core and the electrically excited stator iron core, so that the structure arrangement of the stator of the hybrid excitation generator is compact, and the smooth adjustment of air gap magnetic flux is realized under the condition of occupying the axial space of an armature as little as possible; the annular electric excitation winding is arranged on the fin-type insulating framework, and a special conductor arrangement mode is adopted, so that the inlet and outlet leads of the multi-turn electric excitation winding can pass through one axial hole, and meanwhile, axial and radial ventilation grooves are formed and are communicated with the axial ventilation groove in the main stator iron core into a whole, the integral heat dissipation of the generator iron core, the armature winding and the excitation winding is facilitated, and the power density of the whole machine is improved.

Description

Stator module of hybrid excitation generator

Technical Field

The invention relates to the technical field of hybrid excitation generators, in particular to a stator module of a hybrid excitation generator.

Background

There are two sources of magnetic potential in a hybrid excitation synchronous generator: permanent magnetic potential and direct current excitation magnetic potential. The permanent magnet generates main magnetic flux, the direct current excitation generates auxiliary magnetic flux, the main magnetic flux generated by the permanent magnet is adjusted through the auxiliary magnetic flux and the weak magnetic flux of the auxiliary magnetic flux, the smoothness and adjustability of an air gap magnetic field can be achieved, and when the rotating speed of the generator changes and the load fluctuates, the constant of the voltage of the output end of the generator is achieved.

The current hybrid excitation structure mainly comprises the following parts:

in the patent with publication number CN109951037A, the hybrid excitation rotor in the adopted composite excitation structure consists of an electrically excited rotor with a carbon brush slip ring structure and an invisible permanent magnet rotor. In the patent with publication number CN109217599A, in order to avoid passing through a slip ring lead on the rotor, an additional auxiliary generator mode is adopted to supply power to the field coil of the rotor, and the power is supplied to the motor structure through the generator structure, thereby realizing internal power supply, the motor structure and the generator structure respectively generate a permanent magnetic excitation flux and an electric excitation flux, the two are organically combined to jointly affect the air gap field inside the motor, and flexible adjustment of the air gap field can be realized by changing the magnitude and direction of the excitation current; obviously, the rotor hybrid excitation structure inevitably causes the manufacturing of peripheral motor accessories of the rotor to be complicated, or the rotor introduces slip rings and wiring to cause the problem of high failure rate of the motor.

In the patent publication No. CN107276350A, the hybrid excitation structure adopts a hybrid magnetic pole on a stator structure, and includes an outer stator, an inner stator and an intermediate rotor structure, the outer stator adopts an armature structure of an ac asynchronous motor, a permanent magnet rotor magnetic pole and an electro-magnetic winding are mounted on the inner stator structure, and the intermediate rotor is not equipped with a permanent magnet. The permanent magnetic field and the electric excitation magnetic field are connected in parallel, the directions of the permanent magnetic field and the electric excitation magnetic field in a public magnetic circuit are opposite by setting the polarity of the excitation current and the excitation direction of the permanent magnet, and the smooth adjustment and control of the air gap magnetic field of the motor are realized.

In the patent with publication number CN110504810A, the hybrid excitation structure is mainly implemented by a stator, which needs to be implemented by arranging a plurality of stator units, each stator unit structure includes 2 short armature cores, 2 cylindrical permanent magnet excitation units, 2 long armature cores, and 2 annular excitation coil units, and the adjustment of the air gap field of the motor is implemented by the permanent magnet excitation units and the annular excitation coil units. Obviously, the stator structure of this mode is very complicated, and the auxiliary excitation has increased the axial dimension of motor, is unfavorable for the promotion of motor power density.

Disclosure of Invention

The invention aims to provide a stator module of a hybrid excitation generator, which solves the problems in the prior art, wherein an iron core of the stator module is formed by axially splicing a main stator iron core and an electric excitation stator iron core, a non-magnetic-conductive magnetic isolation plate is arranged between the two iron cores, and a three-phase armature winding simultaneously penetrates through the main stator iron core and the electric excitation stator iron core, so that the stator of the hybrid excitation generator has compact structural arrangement, and the air gap flux is smoothly adjusted under the condition of occupying the axial space of the armature as little as possible. And axial ventilation holes in the yoke part of the main stator core and axial and radial ventilation channels formed by coil supporting insulation bridges and fin type insulation frameworks in the electric excitation winding assembly jointly form an internal ventilation channel of the generator, so that the integral heat dissipation of the iron core, the armature winding and the excitation winding of the generator is facilitated, and the power density of the whole machine is facilitated to be improved.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a stator module of a hybrid excitation generator, which comprises an electric excitation winding assembly, an electric excitation stator core, a stator insulation end plate, a stator non-magnetic tooth space section, a non-magnetic separation plate, a main stator core and an armature; the electric excitation winding assembly is nested in the outer ring of the stator non-magnetic tooth space section and is clamped by the two electric excitation stator iron cores to form an electric excitation stator assembly; the stator insulation end plate is arranged at the outer end of the electrically excited stator core at one side, the non-magnetic-conductive magnetic isolation plate is arranged between the electrically excited stator core and the main stator core at the other side, and the electrically excited stator assembly and the main stator core are isolated to form an axial isolation region of a main magnetic circuit and an auxiliary excitation magnetic circuit;

when the motor is inserted with wires, the armature windings sequentially penetrate through the main stator core, the non-magnetic-conductive magnetism isolating plate, the stator non-magnetic-conductive tooth space section and the electrically excited stator core along the axial direction, wherein a plurality of tooth spaces are circumferentially arranged on the stator non-magnetic-conductive tooth space section and the non-magnetic-conductive magnetism isolating plate and used for embedding the armature windings and are tightly attached to the armature windings; the winding direction of an electric excitation winding of the electric excitation winding assembly is perpendicular to the axis of the generator and is orthogonal to the effective coil edge of the armature winding.

Preferably, the electric excitation winding assembly comprises a coil supporting insulation bridge frame, a fin-type insulation framework, an inner ring electric excitation winding, a middle ring electric excitation winding, an outer ring electric excitation winding and a magnetic sleeve;

the inner ring electric excitation winding, the middle ring electric excitation winding and the outer ring electric excitation winding are wound on the outer circle of the fin type insulating framework in sequence; the inner ring electric excitation winding and the middle ring electric excitation winding are odd-numbered coils, the outer ring electric excitation winding is even-numbered coils, the inner ring electric excitation winding and the middle ring electric excitation winding and the outer ring electric excitation winding are separated by the coil supporting insulation bridge frame, the outer side of the outer ring electric excitation winding is sleeved with the magnetic conduction sleeve, and the magnetic conduction sleeve is a whole circle of magnetic conduction steel and is abutted against the electric excitation stator core.

Preferably, the fin-type insulating framework comprises an annular framework and a plurality of groups of fins circumferentially distributed on the outer ring of the framework, each group of fins comprises a first fin, a second fin and a third fin, and the first fin and the third fin are positioned at the upper boundary and the lower boundary of the framework to form a limiting boundary of the electric excitation winding; the second fin is at least provided with one and is arranged between the first fin and the third fin, an electric excitation winding channel is axially divided between the first fin and the third fin, and a radial ventilation groove can be formed between two groups of axially adjacent electric excitation windings.

Preferably, the coil supporting insulation bridge is a U-shaped bracket body structure, after the winding of the inner ring electric excitation winding is finished, a plurality of coil supporting insulation bridges are circumferentially arranged to cover the outer part of the inner ring electric excitation winding, the middle ring electric excitation winding is wound on the outer rings of the coil supporting insulation bridges, a layer of coil supporting insulation bridges is covered outside the middle ring electric excitation winding, and the coil supporting insulation bridge frame outside the inner ring electric excitation winding is in one-to-one correspondence with the coil supporting insulation bridge frame outside the middle ring electric excitation winding, the outer ring electric excitation winding is wound on the outer ring of the coil support insulation bridge frame outside the middle ring electric excitation winding, by arranging the coil supporting insulating bridge frame, axial ventilation grooves are formed between the inner ring electric excitation winding and the middle ring electric excitation winding and between the middle ring electric excitation winding and the outer ring electric excitation winding.

Preferably, the main stator core, the non-magnetic-conductive magnetic isolation plate, the electrically-excited stator core and the stator insulation end plate are circumferentially provided with a plurality of ventilation holes which are communicated with each other.

Preferably, the main stator core, the electrically excited stator core and the flux sleeve are assembled with the casing by adopting a flat key, and are used for transmitting the torque of the generator.

Compared with the prior art, the invention has the following beneficial technical effects:

1. the stator module of the hybrid excitation generator provided by the invention has the advantages that the iron core is formed by axially splicing the main stator iron core and the electric excitation stator iron core, the non-magnetic-conductive magnetic isolation plate is arranged between the two iron cores, and the three-phase armature winding simultaneously penetrates through the main stator iron core and the electric excitation stator iron core, so that the stator of the hybrid excitation generator is compact in structural arrangement, and the air gap flux is smoothly adjusted under the condition of occupying as little as possible of the axial space of the armature.

2. According to the stator module of the hybrid excitation generator, the multilayer annular electric excitation windings are arranged on the fin-type insulating framework and adopt a special conductor arrangement mode, so that the inlet and outlet leads of the multi-turn electric excitation windings are arranged at the positions close to the same side of the stator module, the inlet and outlet leads can penetrate through an axial hole, and the direct-current outlet terminal of the electric excitation coil and the three-phase high-voltage outlet are conveniently arranged in an adjacent mode.

3. The coil supporting insulation bridge frame and the fin type insulation framework are provided with a plurality of layers of annular electric excitation windings to form axial and radial ventilation grooves which are communicated with the axial ventilation holes in the main stator core into a whole, so that the integral heat dissipation of the generator core, the armature winding and the excitation winding is facilitated, and the power density of the whole machine is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a partial perspective view of a stator module of a hybrid excitation generator according to the present invention;

fig. 2 is a perspective exploded view of a stator module of the hybrid excitation generator of the present invention;

FIG. 3 is a schematic partial perspective view of an electrically excited winding assembly according to the present invention;

FIG. 4 is a perspective exploded view of an electrically energized winding assembly of the present invention;

FIG. 5 is a schematic perspective view of a fin-type insulating skeleton according to the present invention;

FIG. 6 is a view of the distribution of the ventilation channels of the electrical field winding assembly of the present invention;

FIG. 7 is a view showing the distribution of the cooling air passage of the stator module of the hybrid excitation generator of the present invention;

in the figure: 1-an electric excitation winding assembly, 2-an electric excitation stator core, 3-a stator insulation end plate, 4-a stator non-magnetic tooth space section, 5-a non-magnetic separation plate, 6-a main stator core, 7-an armature, 8-a stator core flat key I and 9-a stator core flat key II;

101-coil supporting insulation bridge, 102-fin type insulation framework, 103-inner ring electric excitation winding, 104-middle ring electric excitation winding, 105-outer ring electric excitation winding and 106-magnetic sleeve; 1021-first fin, 1022-second fin, 1023-third fin, 1024-skeleton, 10201-radial ventilation channel, 10301-axial ventilation channel, 201-ventilation hole on electrically excited stator core, 301-ventilation hole on stator insulation end plate, 601-ventilation hole on main stator core.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a stator module of a hybrid excitation generator, which aims to solve the problems in the prior art.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1 and 2, the stator module of the hybrid excitation generator in this embodiment includes an electrical excitation winding assembly 1, an electrical excitation stator core 2, a stator insulating end plate 3, a stator non-magnetic tooth space section 4, a non-magnetic partition plate 5, a main stator core 6, an armature 7, and a stator core flat key; the electric excitation winding assembly 1 is nested in the outer ring of the stator non-magnetic tooth space section 4 and is clamped by the two electric excitation stator iron cores 2 to form an electric excitation stator assembly; the stator insulation end plate 3 is arranged at the outer end of the electrically excited stator core 2 at one side, and the non-magnetic-conductive magnetic isolation plate 5 is arranged between the electrically excited stator core 2 and the main stator core 6 at the other side to isolate the electrically excited stator assembly from the main stator core 6, so that an axial isolation region of a main magnetic circuit and an auxiliary excitation magnetic circuit is formed.

When the motor is inserted with wires, the plurality of armatures 7 sequentially penetrate through the main stator core 6, the non-magnetic-conductive magnetism isolating plate 5, the stator non-magnetic-conductive tooth space section 4 and the electric excitation stator core 2 along the axial direction, wherein the plurality of tooth spaces are circumferentially arranged on the stator non-magnetic-conductive tooth space section 4 and the non-magnetic-conductive magnetism isolating plate 5 and used for embedding the armatures 7 and are tightly attached to the armatures 7, so that the heat of the armatures 7 is favorably conducted to a machine shell, and the electric excitation windings only pass through the electric excitation iron core, so that the axial overlapping of the two windings is reduced to the maximum extent, and the axial; the winding direction of the electric excitation winding assembly 1 is vertical to the axis of the generator and is orthogonal to the effective edge of the coil of the armature 7.

As shown in fig. 3 and 4, the electrical excitation winding assembly 1 includes a coil support insulation bridge 101, a fin-type insulation skeleton 102, an inner ring electrical excitation winding 103, an intermediate ring electrical excitation winding 104, an outer ring electrical excitation winding 105, and a flux sleeve 106;

an inner ring electric excitation winding 103, a middle ring electric excitation winding 104 and an outer ring electric excitation winding 105 are sequentially wound on the excircle of the fin type insulating framework 102; the inner ring electric excitation winding 103 and the middle ring electric excitation winding 104 are odd-numbered coils, and the outer ring electric excitation winding 105 is an even-numbered coil, so that the inlet and outlet leads of the electric excitation winding are positioned at the same end and at the same angle, and the lead is conveniently led out to the junction box; the inner ring electric excitation winding 103 and the middle ring electric excitation winding 104, and the middle ring electric excitation winding 104 and the outer ring electric excitation winding 105 are separated by a coil support insulation bridge frame 101, the outer side of the outer ring electric excitation winding 105 is sleeved with a magnetic conduction sleeve 106, the magnetic conduction sleeve 106 is full-circle magnetic conduction steel and is abutted against the electric excitation stator iron core 2, and the electric excitation winding is used for forming an axial magnetic path channel when being electrified.

When the electric excitation coil is electrified, the auxiliary excitation magnetic flux enters the magnetic conduction sleeve 106 from the electric excitation stator iron core 2, then enters the electric excitation stator iron core 2 (the auxiliary excitation magnetic flux cannot enter the main iron core due to the magnetic isolation effect of the non-magnetic conduction magnetic isolation plate 5) which is abutted against the electric excitation stator iron core from the magnetic conduction sleeve 106, then enters the rotor yoke part after entering the air gap of the stator and the rotor, and returns to the electric excitation stator iron core 2 through the rotor yoke part to form an electric excitation closed loop; and then the main magnetic flux and the main magnetic flux form a mixed excitation magnetic field, and the main magnetic flux is smoothly regulated by regulating the magnitude and the direction of current in the electric excitation winding.

As shown in fig. 5 and 6, the fin-type insulating skeleton 102 includes an annular skeleton 1024 and a plurality of groups of fins circumferentially distributed on an outer ring of the skeleton 1024, each group of fins includes a first fin 1021, a second fin 1022 and a third fin 1023, and the first fin 1021 and the third fin 1023 are located at upper and lower boundaries of the skeleton 1024 to form a limiting boundary of the electrically excited winding; at least one of the second fins 1022 is arranged between the first fin 1021 and the third fin 1023, an electric excitation winding channel is axially divided between the first fin 1021 and the third fin 1023, and a radial ventilation groove 10201 can be formed between two axially adjacent groups of electric excitation windings; the coil supporting insulation bridge 101 is a U-shaped bracket body structure, after the winding of the inner ring electric excitation winding 103 is completed, a plurality of coil supporting insulating bridges 101 are arranged to cover the outer part of the inner ring electric excitation winding 103 in the circumferential direction, an intermediate ring electric excitation winding 104 is wound on the outer ring of the plurality of coil supporting insulation bridges 101, a layer of coil supporting insulation bridge frame 101 is covered outside the middle ring electric excitation winding 104, the coil supporting insulation bridge frame 101 outside the inner ring electric excitation winding 103 is in one-to-one correspondence with the coil supporting insulation bridge frame 101 outside the middle ring electric excitation winding 104, the outer ring electric excitation winding 105 is wound on the outer ring of the coil supporting insulation bridge frame 101 outside the middle ring electric excitation winding 104, by arranging the coil support insulation bridge 101, axial ventilation grooves 10301 are formed between the inner ring electric excitation winding 103 and the middle ring electric excitation winding 104, and between the middle ring electric excitation winding 104 and the outer ring electric excitation winding 105.

The inner ring electric excitation winding 103 and the middle ring electric excitation winding 104 adopt odd-numbered wire gauges, the outer ring electric excitation winding 105 adopts even-numbered wire gauges, so that the starting point and the end point of the excitation winding can be on the same side, and an insulating sleeve can penetrate through one axial vent hole to be led out to an external outlet terminal.

As shown in fig. 7, the main stator core 6, the non-magnetic-conductive magnetic-isolation plate 5, the electrically-excited stator core 2 and the stator insulation end plate 3 are circumferentially provided with a plurality of ventilation holes which are communicated with each other, and an axial ventilation channel 10301 and a radial ventilation channel 10201 are formed in the multi-layer annular electrically-excited winding and fin-type insulation framework 102, so that the whole axial ventilation holes of the motor are communicated, thereby being beneficial to forming a circulation air path in the generator and effectively cooling the armature 7 winding and the excitation winding.

In the embodiment, the main stator core 6, the electrically excited stator core 2 and the flux sleeve 106 are assembled with the casing by adopting a stator core flat key and are used for transmitting the torque of the generator; the stator core flat key comprises a first stator core flat key 8 and a second stator core flat key 9, the first stator core flat key 8 is arranged on the outer ring of one of the electrically excited stator cores 2 and the magnetic conductive sleeve 106, the second stator core flat key 9 is arranged on the outer ring of the other one of the electrically excited stator cores 2, the non-magnetic conductive magnetic partition plate 5 and the main stator core 6, and the electrically excited stator core 2, the non-magnetic conductive magnetic partition plate 5 and the main stator core 6 share one another.

The principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above examples is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.

Claims

1. A stator module of a hybrid excitation generator is characterized in that: the permanent magnet synchronous motor comprises an electric excitation winding assembly, an electric excitation stator iron core, a stator insulation end plate, a stator non-magnetic tooth slot section, a non-magnetic separation plate, a main stator iron core and an armature winding; the electric excitation winding assembly is nested in the outer ring of the stator non-magnetic tooth space section and is clamped by the two electric excitation stator iron cores to form an electric excitation stator assembly; the stator insulation end plate is arranged at the outer end of the electrically excited stator core at one side, the non-magnetic-conductive magnetic isolation plate is arranged between the electrically excited stator core and the main stator core at the other side, and the electrically excited stator assembly and the main stator core are isolated to form an axial isolation region of a main magnetic circuit and an auxiliary excitation magnetic circuit;

2. The stator module of a hybrid excitation generator according to claim 1, wherein: the electric excitation winding assembly comprises a coil supporting insulation bridge, a fin type insulation framework, an inner ring electric excitation winding, a middle ring electric excitation winding, an outer ring electric excitation winding and a magnetic sleeve;

3. The stator module of a hybrid excitation generator according to claim 2, wherein: the fin type insulating framework comprises an annular framework and a plurality of groups of fins circumferentially distributed on the outer ring of the framework, each group of fins comprises a first fin, a second fin and a third fin, and the first fin and the third fin are positioned at the upper boundary and the lower boundary of the framework to form a limiting boundary of the electric excitation winding; the second fin is at least provided with one and is arranged between the first fin and the third fin, an electric excitation winding channel is axially divided between the first fin and the third fin, and a radial ventilation groove can be formed between two groups of axially adjacent electric excitation windings.

4. The stator module of a hybrid excitation generator according to claim 3, wherein: the coil supporting insulation bridge is of a U-shaped bracket body structure, after the inner ring electric excitation winding is wound, a plurality of coil supporting insulation bridges are circumferentially arranged to cover the outer part of the inner ring electric excitation winding, the middle ring electric excitation winding is wound on the outer rings of the coil supporting insulation bridges, a layer of coil supporting insulation bridges is covered outside the middle ring electric excitation winding, and the coil supporting insulation bridge frame outside the inner ring electric excitation winding is in one-to-one correspondence with the coil supporting insulation bridge frame outside the middle ring electric excitation winding, the outer ring electric excitation winding is wound on the outer ring of the coil support insulation bridge frame outside the middle ring electric excitation winding, by arranging the coil supporting insulating bridge frame, axial ventilation grooves are formed between the inner ring electric excitation winding and the middle ring electric excitation winding and between the middle ring electric excitation winding and the outer ring electric excitation winding.

5. The stator module of a hybrid excitation generator according to claim 4, wherein: the main stator core, the non-magnetic-conductive magnetic isolation plate, the electrically excited stator core and the stator insulation end plate are circumferentially provided with ventilation holes which are communicated with each other, and the ventilation holes are circumferentially provided with a plurality of ventilation holes.

6. The stator module of a hybrid excitation generator according to claim 2, wherein: the main stator core, the electro-magnetic stator core and the magnetic conductive sleeve are assembled with the shell by adopting a stator core flat key and are used for transmitting the torque of the generator.