CN112104111A - Exciter stator punching sheet, stator core, stator, hybrid excitation device and generator - Google Patents
Exciter stator punching sheet, stator core, stator, hybrid excitation device and generator Download PDFInfo
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- CN112104111A CN112104111A CN202010962707.6A CN202010962707A CN112104111A CN 112104111 A CN112104111 A CN 112104111A CN 202010962707 A CN202010962707 A CN 202010962707A CN 112104111 A CN112104111 A CN 112104111A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
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- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses an exciter stator punching sheet, a stator core, a stator, a hybrid excitation device and a generator for a brushless generator. The invention designs a special exciter stator punching sheet in an exciter stator by utilizing rare earth permanent magnet materials, introduces permanent magnet excitation, is equivalent to the combination of a permanent magnet auxiliary exciter and an exciter, has the advantages of better comprehensive performance of Permanent Magnet Generator (PMG) excitation and simple structure of a direct controllable excitation circuit (two-machine excitation system), improves the load carrying capacity of the brushless generator, improves the excitation regulation response speed and improves the transient voltage regulation rate of the brushless generator. By adopting the excitation mode, the structure of the brushless generator is simplified, the volume is reduced, the cost is saved, and certain economic benefit is achieved.
Description
Technical Field
The invention relates to the field of alternating current brushless generators, in particular to an exciter stator punching sheet, a stator core, a stator, a hybrid excitation device and a generator.
Background
With the continuous improvement of the cost performance of the neodymium iron boron (NdFeB) which is a novel rare earth permanent magnet material, the rare earth permanent magnet motor is widely applied in more and more fields due to the advantages of small volume, high efficiency, good dynamic response characteristic and the like. However, due to the inherent characteristics of the permanent magnet material, the air gap magnetic field base wood in the permanent magnet motor keeps constant, and when the permanent magnet motor is used for generating electricity, the voltage regulation rate is high, so that the power supply quality is influenced. How to realize effective adjustment and control of the air gap magnetic field is always a hotspot and difficulty of research of permanent magnet motors. The motor structure is reasonably changed, the auxiliary electric excitation winding is introduced, the 'mixed excitation' idea of flexibly adjusting the air gap field is provided, the recognition and the attention of students in the motor field at home and abroad are obtained, and meanwhile, the students in various countries carry out beneficial exploration and research on various mixed excitation motor structures and control systems thereof. In the last decade, there has been an occasional paper relating to hybrid excitation motors in authoritative periodicals and international meetings. Professor t.a.lipo, a well-known motor expert at the university of wisconsin, usa, has made a highly effective study on the hybrid excited motor technology, and there are a number of patent publications relating to hybrid excited motors and their applications. The improvement of the performance and reliability of the brushless generator is receiving more and more attention and attention from people.
A synchronous generator is a conversion device that converts mechanical energy into alternating current energy. In the past, the excitation of the synchronous generator of the diesel generator set of the self-contained power station is widely adopted, and a direct-current generator provides excitation current to generate electricity. In the excitation mode, because the direct-current generator is applied, alternating current is converted into direct current and is converted through the rectifier, and excitation current is provided for the excitation winding through the copper ring and the carbon brush of the synchronous generator, so that a plurality of problems are brought to the aspects of maintenance and safe operation. In order to improve this excitation pattern. In the 60 s, self-excited constant-voltage synchronous generators with static silicon rectifiers were mainly developed, carbon brushes and slip rings still exist in the generators, frequent maintenance is still needed, and wireless electromagnetic interference is generated. In order to fundamentally solve the existing problems, modern synchronous generators are widely developed by improvement and development of a brushless synchronous generator of a coaxial ac brushless exciter and a rotating rectifier.
For a general generator with a single machine power supply, the reliability and stability of the operation of the synchronous generator during steady-state operation or transient state are mainly controlled.
Brushless excitation has various forms, such as direct controllable excitation, third harmonic excitation, current transformer compound excitation, third harmonic compound excitation, Permanent Magnet Generator (PMG) excitation and the like.
The excitation mode controlled by a Permanent Magnet Generator (PMG) excitation (three-machine excitation system), an AVR (automatic voltage regulator), as shown in fig. 1 is an excitation mode with better overall performance at present. The permanent magnet generator provides excitation power to the exciter through an AVR, which is a control device that regulates the exciter excitation current. The PMG system (permanent magnet generator) provides a constant source of excitation power independent of the stator load, provides high motor start-up capability, and is immune to waveform distortion of the main machine stator output voltage produced by nonlinear loads such as thyristor dc motors. The advantages are that: the excitation power supply is not influenced by the change of the system load; the disadvantages are as follows: the adjusting response speed is low, the length of the shafting is long, the shafting oscillation is easy to cause, and the structure is complex.
The direct controllable excitation circuit (two-machine excitation system) shown in fig. 2 is simplest, small in size, light in weight and free from the need of additionally embedding an auxiliary winding. But it has no compound excitation function and needs to be additionally provided with a short-circuit current maintaining device. The advantages are that: the auxiliary exciter is cancelled, and the length of a shaft system is shortened; the disadvantages are as follows: the adjustment response speed is slow.
In the above brushless excitation system, the field of the exciter is supplied by the exciting current of the ac exciter, so that the response speed of the exciting voltage is insufficient and the transient performance of the brushless generator is not good.
Disclosure of Invention
In view of this, the embodiment of the present invention provides an exciter stator lamination, a stator core, a stator, a hybrid excitation device and a generator for a brushless generator. The invention designs a special exciter stator punching sheet in an exciter stator by utilizing rare earth permanent magnet materials, introduces permanent magnet excitation, is equivalent to the combination of a permanent magnet auxiliary exciter and an exciter, has the advantages of better comprehensive performance of Permanent Magnet Generator (PMG) excitation and simple structure of a direct controllable excitation circuit (two-machine excitation system), improves the load carrying capacity of the brushless generator, improves the excitation regulation response speed and improves the transient voltage regulation rate of the brushless generator. By adopting the excitation mode, the structure of the brushless generator is simplified, the volume is reduced, the cost is saved, and certain economic benefit is achieved.
Therefore, the embodiment of the invention provides the following technical scheme:
according to an aspect of the present invention, there is provided a stator lamination of a brushless generator, including a yoke portion and a tooth portion;
the yoke part is annular and consists of a plurality of arc structures;
the tooth part is provided with a plurality of stator teeth, first ends of the plurality of stator teeth are respectively connected with the inner circumference side of the yoke part, second ends of the plurality of stator teeth extend out in the direction far away from the yoke part, and square grooves are respectively arranged at the second ends of the plurality of stator teeth.
Furthermore, the stator punching sheet is integrally formed or the arc-shaped structures of the plurality of yoke parts and the stator punching sheet units formed by the stator teeth are spliced.
Further, the plurality of stator teeth are evenly distributed along the circumference.
Furthermore, both sides of the second ends of the plurality of stator teeth are provided with an inward concave structure or an outward convex structure.
Further, second ends of the plurality of stator teeth are provided with tooth shoes.
According to an aspect of the present invention, there is provided a stator core of a brushless generator, including:
the plurality of stator laminations described in any one of the above; the stator punching sheets are aligned and laminated mutually, and pits are formed at corresponding positions of square grooves of the stator teeth after the stator punching sheets are aligned and laminated mutually.
According to an aspect of the present invention, there is provided a stator of a brushless generator, including:
the above-described stator core;
a plurality of field coils wound on the plurality of stator teeth, respectively;
and the square permanent magnets are respectively embedded in the pits.
Further, the number of the stator teeth is even, and the adjacent square permanent magnets in the square permanent magnets are opposite in polarity.
According to an aspect of the present invention, there is provided a hybrid excitation device of a brushless generator, including:
the stator of the brushless generator described above, which serves as an exciter stator;
an exciter rotor;
a main machine rotor;
a main machine stator;
a rotating diode;
an automatic voltage regulator connecting the exciter stator and the main machine stator for providing excitation power to the exciter;
the main machine rotor, the exciter rotor and the rotating diodes are coaxially arranged.
According to an aspect of the present invention, there is provided a hybrid excitation brushless generator including: the hybrid excitation device of the brushless generator is provided.
According to the exciter stator punching sheet, the hybrid excitation device and the generator of the brushless generator in the technical scheme, the exciter stator punching sheet which is provided with the grooves on the stator teeth and can be provided with the permanent magnet is designed, namely the permanent magnet auxiliary exciter and the exciter are combined into a whole, the structure has the advantages of better comprehensive performance of Permanent Magnet Generator (PMG) excitation and the advantage of simple structure of a direct controllable excitation circuit (two-machine excitation system), the load carrying capacity of the brushless generator is improved, the excitation regulation response speed is improved, and the transient voltage regulation rate is improved. Of course, not all of the above-described advantages need to be achieved in the practice of any one product or method of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For purposes of illustrating and describing some portions of the present invention, corresponding parts may be exaggerated in the drawings, i.e., made larger relative to other components in an exemplary apparatus actually manufactured according to the present invention. Similarly, the distances between the individual components or modules in the drawings, whether the connecting lines are curved or not, do not represent the distances between the components or the shapes of the connecting lines. In the drawings, the same or similar technical features or components will be denoted by the same or similar reference numerals. In the drawings and the associated text, letters or words of different fonts or lower case denote the same meaning, e.g. phi and phi
Are meant to be the same.
Fig. 1 is a schematic diagram of a brushless motor of the prior art.
Fig. 2 is a schematic diagram of a brushless motor of the prior art.
Fig. 3 is a schematic diagram and a partial enlarged view of a stator punching sheet according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a stator according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a stator according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a brushless motor according to an embodiment of the invention.
Fig. 7 is a schematic view of a prior art stator.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
According to an embodiment of the present invention, referring to fig. 3, a stator lamination 1 of a brushless generator is provided, which includes a yoke portion 11 and a tooth portion 12; the yoke part 11 is annular and consists of a plurality of arc-shaped structures 111; the tooth portion 12 has a plurality of stator teeth 121, first ends of the plurality of stator teeth 121 are respectively connected to an inner circumferential side of the yoke portion 11, second ends of the plurality of stator teeth 121 extend in a direction away from the yoke portion 11, and second ends of the plurality of stator teeth 121 are respectively provided with a square groove 1211.
The second ends of the stator teeth are provided with the square grooves, so that the stator teeth can be used for installing the permanent magnets to provide a constant magnetic field, the stator teeth can also be used for winding the excitation coils, the permanent magnets can provide the constant magnetic field, the excitation coils provide a variable magnetic field, and the permanent magnets and the excitation coils jointly form an air gap magnetic field. According to the load change of the generator, the size of the exciting current led into the exciting coil is changed (namely, the size of the air gap magnetic field is changed), and the output voltage of the generator is kept stable. Because the synthesized air gap magnetic field has the constant magnetic field provided by the permanent magnet, the load capacity of the brushless generator is improved, and the transient voltage regulation rate of the brushless generator is improved.
In some embodiments, the stator lamination 1 is integrally formed or a stator lamination unit composed of an arc-shaped structure 111 of a plurality of yoke portions and stator teeth 121 is spliced.
The integrated into one piece structural strength is higher, and the mode preparation of amalgamation is more nimble.
In some embodiments, the plurality of stator teeth 121 are evenly distributed along the circumference. The stator teeth are uniformly distributed along the circumference, so that the structure and mechanical stability of the stator punching sheet are facilitated.
In some embodiments, both sides of the second end of the plurality of stator teeth 121 are provided with an inner concave structure 1212 or an outer convex structure. The concave or convex is arranged to facilitate more stable winding of the wire ring.
In some embodiments, second ends of the plurality of stator teeth 121 are provided with tooth shoes. The arrangement of the tooth boots is beneficial to more stably winding the wire ring and is also convenient to be matched with the rotor.
According to one embodiment of the present invention, referring to fig. 4 and 5, there is provided a stator core 2 of a brushless generator, including:
the plurality of stator laminations 1 of any one of the above;
the plurality of stator laminations 1 are aligned and laminated with each other, and pits 21 are formed at corresponding positions of the square grooves 1211 of the plurality of stator teeth 121 after the plurality of stator laminations 1 are aligned and laminated with each other.
It is easy to understand, because the stator core of this embodiment has above-mentioned stator towards the piece constitution, has the similar technological effect with above-mentioned stator towards piece technical scheme, and this is not repeated.
According to an embodiment of the present invention, referring to fig. 4 and 5, there is provided a stator 3 of a brushless generator, including:
the stator core 2 of any one of the above;
a plurality of field coils 31, the field coils 31 being wound around the plurality of stator teeth 121, respectively;
and a plurality of square permanent magnets 32, the square permanent magnets 32 being respectively embedded in the recesses 21.
It is easy to understand that, because the stator of this embodiment is composed of the above-mentioned stator core, has similar technical effects with the above-mentioned stator punching, stator core technical scheme, and this is not repeated.
In some embodiments, referring to fig. 4 and 5, the plurality of stator teeth 121 is an even number, and adjacent ones of the plurality of square permanent magnets 32 are of opposite polarity.
The stator teeth are even number, and the adjacent magnets are opposite in polarity, so that a magnetic field which is more beneficial to the work of the motor can be generated.
According to an embodiment of the present invention, referring to fig. 2 and fig. 4, 5, 6, there is provided a hybrid excitation device 4 of a brushless generator, comprising:
the stator 3 of any of the above brushless generators, the stator 3 of the brushless generator being an exciter stator 3;
an exciter rotor;
a main machine rotor;
a main machine stator;
a rotating diode;
the automatic voltage regulator is connected with the exciter stator 3 and the main machine stator and is used for providing excitation power for the exciter;
the main machine rotor, the exciter rotor and the rotating diode are coaxially arranged.
It is easy to understand that, since the hybrid excitation device of the brushless generator of the present embodiment has similar technical effects to the above-mentioned stator lamination and stator core technical solutions, it is not repeated here.
According to an embodiment of the present invention, referring to fig. 4, 5, and 6, there is provided a hybrid excitation brushless generator including:
the hybrid excitation device 4 of the brushless generator according to any one of the above aspects.
It is easy to understand that, since the hybrid excitation device of the brushless generator of the present embodiment has similar technical effects to the above-mentioned stator lamination and stator core technical solutions, it is not repeated here.
The technical effects of the present invention will be further explained by an experiment using the brushless motor of the present invention (using the exciter stator shown in fig. 5) and the brushless motor of the related art (using the exciter stator shown in fig. 7).
| Test items | JB/T3320 specifies values (G2) | FIG. 5 exciter stator | FIG. 7 exciter stator |
| Steady state voltage regulation rate (%) | 2.5 | 2.1 | 1.8 |
| Steady state voltage regulation rate (%) | -20/+25 | -18/+23 | -12/+10 |
| Voltage recovery time(s) | 1.5 | 1.2 | 0.8 |
Therefore, after the exciter stator is adopted, the performance index of the generator is improved, and the effect is obvious.
According to the above description, the technical effects of the present invention are: an exciter stator punching sheet, a stator core, a stator, a hybrid excitation device and a generator for a brushless generator are provided. The invention utilizes rare earth permanent magnet materials, designs the exciter stator punching sheet with the groove for installing the permanent magnet in the exciter stator, introduces the permanent magnet excitation, is equivalent to the permanent magnet auxiliary exciter and the exciter which are combined into a whole, has the advantages of better comprehensive performance of Permanent Magnet Generator (PMG) excitation and simple structure of a direct controllable excitation circuit (two-machine excitation system), improves the load carrying capacity of the brushless generator, improves the excitation regulation response speed and improves the transient voltage regulation rate of the brushless generator. By adopting the excitation mode, the structure of the brushless generator is simplified, the volume is reduced, and the cost is saved.
The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.
Those skilled in the art will appreciate that the above description is not meant to be limiting of the apparatus and may include more or less components, or combinations of certain components, or different arrangements of components.
It should be noted that the terms "first" and "second" in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. Numbering in the description or drawings is also not meant to limit the order of precedence, for example S1/S2/S3 does not limit S1/S2/S3 to be performed in sequence, it is possible that S1 and S2 are performed simultaneously or S2 is performed before S1. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising" is used to specify the presence of stated elements, but not to preclude the presence or addition of additional like elements in a process, method, article, or apparatus that comprises the stated elements. All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device and electronic apparatus embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points. The above description is only an example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention. In the foregoing description of specific embodiments of the invention, features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with or instead of the features of the other embodiments.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components. The terms "a," "an," "two," "1," "2," "n-" and the like, as they relate to ordinal numbers, do not necessarily denote the order of execution or importance of the features, elements, steps, or components identified by the terms, but are used merely for identification among the features, elements, steps, or components for clarity of description.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A stator punching sheet (1) of a brushless generator is characterized by comprising a yoke part (11) and a tooth part (12),
the yoke part (11) is annular and consists of a plurality of arc-shaped structures (111);
the tooth part (12) is provided with a plurality of stator teeth (121), first ends of the plurality of stator teeth (121) are respectively connected with the inner circumference side of the yoke part (11), second ends of the plurality of stator teeth (121) extend out in the direction far away from the yoke part (11), and square grooves (1211) are respectively arranged at the second ends of the plurality of stator teeth (121).
2. The stator lamination (1) of the brushless generator according to claim 1, wherein the stator lamination (1) is integrally formed or formed by splicing stator lamination units consisting of arc-shaped structures (111) of a plurality of yoke parts and the stator teeth (121).
3. The stator lamination (1) of a brushless generator as claimed in claim 1, wherein the plurality of stator teeth (121) are evenly distributed along the circumference.
4. The stator lamination (1) of the brushless generator as recited in claim 1, wherein both sides of the second end of the plurality of stator teeth (121) are provided with an inner concave structure (1212) or an outer convex structure.
5. The stator lamination of a brushless generator as recited in claim 1, characterized in that second ends of the plurality of stator teeth (121) are provided with tooth shoes.
6. A stator core (2) of a brushless generator, comprising:
the plurality of stator laminations (1) according to any one of claims 1 to 5,
the stator punching sheets (1) are aligned and laminated with each other, and pits (21) are formed in corresponding positions of square grooves (1211) of the stator teeth (121) after the stator punching sheets (1) are aligned and laminated with each other.
7. A stator (3) of a brushless generator, comprising:
the stator core (2) of claim 6;
a plurality of excitation coils (31), the excitation coils (31) being wound around the plurality of stator teeth (121), respectively;
a plurality of square permanent magnets (32), the square permanent magnets (32) being respectively embedded in the recesses (21).
8. The stator (3) of a brushless generator according to claim 7,
the number of the stator teeth (121) is even, and the adjacent square permanent magnets (32) in the square permanent magnets (32) have opposite polarities.
9. A hybrid excitation device (4) of a brushless generator, characterized by comprising:
the stator (3) of a brushless generator according to any of the claims 7-8, the stator (3) of the brushless generator being an exciter stator (3);
an exciter rotor;
a main machine rotor;
a main machine stator;
a rotating diode;
an automatic voltage regulator connecting the exciter stator (3) and the main machine stator for providing excitation power to the exciter;
the main machine rotor, the exciter rotor and the rotating diodes are coaxially arranged.
10. A hybrid excitation brushless generator, comprising:
hybrid excitation device (4) of a brushless generator according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010962707.6A CN112104111A (en) | 2020-09-14 | 2020-09-14 | Exciter stator punching sheet, stator core, stator, hybrid excitation device and generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010962707.6A CN112104111A (en) | 2020-09-14 | 2020-09-14 | Exciter stator punching sheet, stator core, stator, hybrid excitation device and generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395751A (en) * | 2022-09-20 | 2022-11-25 | 罗灿 | Double pole-changing permanent magnet synchronous motor |
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| CN107834722A (en) * | 2016-09-15 | 2018-03-23 | 丰田自动车株式会社 | The stator of electric rotating machine |
| CN109802501A (en) * | 2019-02-19 | 2019-05-24 | 华中科技大学 | A kind of divided stator carnassial tooth flux switching motor |
| CN111224477A (en) * | 2020-01-19 | 2020-06-02 | 东华大学 | Parallel structure brushless mixed excitation synchronous generator based on harmonic winding excitation |
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| CN115395751A (en) * | 2022-09-20 | 2022-11-25 | 罗灿 | Double pole-changing permanent magnet synchronous motor |
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Application publication date: 20201218 |