CN111446784A - Brushless alternating-current generator - Google Patents
Brushless alternating-current generator Download PDFInfo
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- CN111446784A CN111446784A CN202010306936.2A CN202010306936A CN111446784A CN 111446784 A CN111446784 A CN 111446784A CN 202010306936 A CN202010306936 A CN 202010306936A CN 111446784 A CN111446784 A CN 111446784A
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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
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
The invention provides a brushless alternating-current generator which is simple in structure, small in harmonic wave of alternating-current square wave voltage output by the brushless alternating-current generator and capable of effectively improving voltage output. It includes at least one electricity generation unit, electricity generation unit includes stator and rotor, the rotor passes through actuating mechanism drive and can for the stator rotates, its characterized in that: the stator comprises two stator cores, annular excitation windings or distributed excitation magnetic poles are arranged between the two stator cores, one of the two stator cores is an N pole, the other stator core is an S pole, stator slots are respectively arranged on the stator cores, each phase of each group of windings of the armature windings is composed of two parts, one part is positioned in the N pole stator slots, the other part is positioned in the S pole stator slots, the two parts of armature windings are connected in series to form a group of windings, the two parts of armature windings are distributed corresponding to the salient poles of the rotor, magnetic fluxes penetrating through the series-connected windings are periodic magnetic fluxes with opposite directions, and the time difference is half of a period.
Description
Technical Field
The invention relates to the technical field of the structural design of an alternating-current generator, in particular to a brushless alternating-current generator.
Background
In many conventional ac generators, a rotor excitation system is employed, that is, an excitation magnetic field is generated in a rotor. The rotor forms a pair of magnetic poles or a plurality of pairs of magnetic poles by arranging a permanent magnet or an excitation winding on the rotor to generate an excitation magnetic field form, and external power equipment drives the rotor to rotate to cut an armature winding distributed on the stator to generate sine alternating current. However, the harmonic power of the sine alternating current cannot be effectively utilized, the effective value of the output power is not high, and meanwhile, the structure is complex, the cost is high, and the sine alternating current is not suitable for high-rotation-speed application. However, if the output voltage waveform is a square wave, the power effective value of the square wave is higher than that of the sine wave.
The existing generator with square wave output voltage is a single-phase double-salient generator, however, although the output voltage is square wave, the stator and the rotor are required to adopt salient pole structures, the number of the stator salient poles and the rotor salient poles is strictly limited, and meanwhile, the armature winding adopts centralized arrangement, so that harmonic components are large, the interpolar magnetic leakage is large, and the effective magnetic flux cannot be effectively utilized.
Disclosure of Invention
For the existing doubly salient generator, because the structure of the generator is strictly limited, namely the stator and the rotor are in a salient pole structure, the number of the salient poles of the stator and the rotor is strictly limited, and meanwhile, the armature winding is arranged in a centralized mode, the harmonic wave is large, the interpolar magnetic leakage is large, and the magnetic flux cannot be effectively utilized. The invention provides a brushless alternating-current generator which is simple in structure, small in harmonic wave of alternating-current square wave voltage output by the brushless alternating-current generator and capable of effectively improving voltage output.
The technical scheme is as follows: a brushless alternator comprising at least one power generating unit, the power generating unit comprising a stator and a rotor, the rotor being driven by a drive mechanism and being rotatable relative to the stator, characterized in that: the stator comprises two stator cores, annular excitation windings or distributed excitation magnetic poles are arranged between the two stator cores, one of the two stator cores is an N pole, the other stator core is an S pole, stator slots are respectively arranged on the stator cores, each phase of each group of windings of the armature windings is composed of two parts, one part is positioned in the N pole stator slots, the other part is positioned in the S pole stator slots, the two parts of armature windings are connected in series to form a group of windings, the two parts of armature windings are distributed corresponding to the salient poles of the rotor, magnetic fluxes passing through the series-connected windings are periodic magnetic fluxes with opposite directions, and the time of the two parts of armature windings is different by half of a period;
it is further characterized in that: the outer side of the stator core is respectively provided with an end cover which is fixedly connected with the outer side of the stator core, the end covers are connected with the shaft of the rotor through a bearing sleeve and a bearing, and the bearing sleeve is a magnetic isolation bearing sleeve;
the stator iron core is annular, and radial stator slots are respectively arranged on the opposite surfaces of the stator iron core;
the annular excitation winding comprises an excitation support, the excitation winding is arranged on the excitation support, and two ends of the excitation support are fixedly connected with the peripheral parts of the end covers at two sides respectively; the stator iron cores are respectively fixedly connected with the end covers;
the stator core is cylindrical, and circumferential stator slots are respectively arranged on the inner wall of the stator core;
the annular excitation winding comprises an excitation bracket, the excitation bracket is provided with the excitation winding, and two ends of the excitation bracket are respectively fixedly connected with the outer walls of the two stator cores; the outer end faces of the two ends of the excitation support are respectively and fixedly connected with the end covers on the two sides.
By adopting the structure, because the two sides of the rotor are respectively provided with the stator cores, and the annular excitation winding or the distributed excitation winding arranged between the stator cores enables one of the two stator cores to be an N-pole stator core and the other to be an S-pole stator core, each phase of each group of windings of the armature winding consists of two parts, one half part is positioned in a stator slot of the N-pole stator core, the other half part is positioned in a stator slot of the S-pole stator core, the two parts of armature windings are connected in series to form a group of windings, thus the magnetic flux passing through each half part of the series windings is the periodic magnetic flux with opposite directions, and the time is different by half period, thus the output induced voltage is square wave voltage, the invention has simple structure, simultaneously, no excitation, no brush and no winding are arranged on the rotor, and can be suitable for high rotating speed application, and simultaneously, the armature windings adopt the distributed arrangement, effectively improving the voltage output.
Drawings
FIG. 1 is an exploded view of the overall structure of a first embodiment of the present invention;
FIG. 2 is a side cross-sectional view of the first embodiment of the present invention;
FIG. 3 is an exploded view of the overall structure of a second embodiment of the present invention;
FIG. 4 is a side cross-sectional view of a second embodiment of the present invention;
in the drawings of the first embodiment and the second embodiment: 1. an end cap; 2. a stator core; 3. a stator slot; 4. an armature winding; 5. a rotor; 6. rotor salient poles; 7. an excitation bracket; 8. an excitation winding; 9. a shaft; 10. a bearing; 11. an air gap; 12. and a bearing sleeve.
Detailed Description
Referring to fig. 1 and 2, a brushless ac generator according to a first embodiment of the present invention includes at least one power generating unit including a stator and a rotor 5, wherein the rotor 5 is driven by a shaft 9 externally connected with a driving mechanism and can rotate relative to the stator. The rotor 5 adopts a salient pole structure and does not have any excitation winding or permanent magnet, but damping windings may be arranged according to performance. The stator comprises two stator cores 2 which are respectively arranged at two sides of a rotor 5, air gaps 11 are respectively arranged between the two stator cores 2 and a rotor salient pole 6 of the rotor 5, end covers 1 which are fixedly connected are respectively arranged at the outer sides of the two stator cores 2, the end covers 1 are respectively and relatively and rotatably connected with a shaft 9 of the rotor 5 through bearings 10 and bearing sleeves 12, and the bearing sleeves 12 are magnetic isolation bearing sleeves. The circumference outer wall of two end covers 1 connects the both ends of distributed excitation winding ' S excitation support 7 respectively, excitation winding 8 has been arranged on excitation support 7, make two stator core 2 be N utmost point stator core and S utmost point stator core respectively through excitation winding 8, stator core 2 is the annular, be equipped with radial stator slot 3 on the face in opposite directions of two stator core 2 respectively, every looks of armature winding 4 is half to be located N utmost point stator core ' S stator slot, half is located relative S utmost point stator core ' S stator slot, and series connection. The two stator iron cores 2 are designed in a homopolar mode, and when the excitation winding 8 is electrified, magnetic flux is generated, so that the two stator iron cores 2 are respectively an N-pole stator iron core and an S-pole stator iron core. The magnetic flux circuits shown in fig. 2, one of which is: the magnetic flux starts from the N-pole stator core, passes through the air gap 11 to the rotor salient pole 6, then passes through the air gap 11 to the S-pole stator core, and then returns to the N-pole stator core through the exciting winding 8. When the rotor 5 rotates, the air-gap magnetic flux rotates with the rotation of the rotor salient poles 6, cuts the armature windings 4 corresponding to the rotor salient poles 6, and thereby induces an alternating current in the armature windings 4. Preferably, a magnetic shield sleeve is used as the bearing sleeve 12 connecting the end cover 1 and the rotor 5 in order to prevent leakage magnetic flux.
Referring to fig. 3 and 4, a brushless ac generator according to a second embodiment of the present invention includes at least one power generation unit including a stator and a rotor 5. The rotor 5 is driven by a drive mechanism externally connected to the shaft 9 and is rotatable relative to the stator. The rotor 5 adopts a salient pole structure and does not have any excitation winding or permanent magnet, but damping windings may be arranged according to performance. The stator comprises two stator cores 2 which are respectively arranged at two sides of the rotor 5, air gaps 11 are respectively arranged between the two stator cores 2 and the rotor salient poles of the rotor 5, end covers 1 are respectively arranged at the outer sides of the two stator cores 2, and the end covers 1 are respectively and rotationally connected with a shaft 9 of the rotor 5 through bearings 10 and bearing sleeves 12. Distributed excitation support 7 is arranged between the two stator cores 2, two ends of the excitation support 7 are respectively fixedly connected with the outer walls of the two stator cores 2, the outer end faces of two ends of the excitation support 7 are respectively fixedly connected with the end covers 1 on two sides, excitation windings 8 are arranged on the excitation support 7, and the two stator cores 2 are respectively an N-pole stator core and an S-pole stator core through the excitation windings 8. The stator iron cores 2 are annular, the inner walls of the two stator iron cores 2 are respectively provided with circumferential stator slots, one half of each phase of each group of windings of the armature winding 4 is positioned in the stator slot of the N-pole stator iron core, and the other half of each phase of each group of windings is positioned in the stator slot of the opposite S-pole stator iron core and is connected in series. The two stator iron cores 2 are designed in a homopolar mode, and when the excitation winding 8 is electrified, magnetic flux is generated, so that the two stator iron cores 2 are respectively an N-pole stator iron core and an S-pole stator iron core. The flux circuits shown in dashed lines in fig. 4, one of which is: the magnetic flux starts from the N-pole stator core, passes through the air gap 11 to the rotor salient pole 6, then passes through the air gap 11 to the S-pole stator core, and then returns to the N-pole stator core through the exciting winding 8. When the rotor 5 rotates, the air-gap magnetic flux rotates with the rotation of the rotor salient poles 6, cuts the armature windings 4 corresponding to the rotor salient poles 6, and thereby induces an alternating current in the armature windings 4. Preferably, a magnetic shield sleeve is used as the bearing sleeve 12 connecting the end cover 1 and the rotor 5 in order to prevent leakage magnetic flux.
The working principle of the invention is as follows: because each group of armature windings 4 of each phase of the invention is composed of two parts which are connected in series, namely, half of the armature windings 4 are arranged in the N-pole stator core, and the other half of the armature windings 4 are arranged in the S-pole stator core. Half of the armature windings 4 in the N-pole stator core, since the polarity of the stator core 2 does not change with the rotation of the rotor, the magnetic flux of the armature winding 4 always has one direction, and is recorded as positive, with the periodic rotation of the rotor salient poles 6, a positive half sinusoidal flux periodic variation is formed in this part of the armature winding 4, and, similarly, the other half of the armature winding 4 in the S-pole stator core, the magnetic flux change is negative half-sine periodic change, the two armature windings 4 are connected in series to form a group of armature windings 4, the magnetic flux of the group of armature windings 4 is the superposition of the two magnetic fluxes, namely the superposition of a positive half waveform with a sine period and a negative half waveform with a sine period, because the magnetic fluxes in the two parts of windings are different in time by half period, therefore, the superposed magnetic flux changes into triangular periodically-changing magnetic flux, and the induced voltage is square wave voltage.
The brushless alternating current square wave generator outputs square wave voltage, the armature windings are distributed, the output voltage harmonic is small, voltage pulsation after rectification is small, only the rotor is in a salient pole structure, the magnetic leakage is extremely simple, the power effective value is high, the structure is simple, the reliability is good, meanwhile, no excitation, no brush or winding is arranged on the rotor, the speed of the rotor is not limited, and the rotating speed adjusting range is wide.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A brushless alternator comprising at least one power generating unit, the power generating unit comprising a stator and a rotor, the rotor being driven by a drive mechanism and being rotatable relative to the stator, characterized in that: the stator comprises two stator cores, annular excitation windings or distributed excitation magnetic poles are arranged between the two stator cores, one of the two stator cores is an N pole, the other stator core is an S pole, stator slots are respectively arranged on the stator cores, each phase of each group of windings of the armature windings is composed of two parts, one part is positioned in the N pole stator slots, the other part is positioned in the S pole stator slots, the two parts of armature windings are connected in series to form a group of windings, the two parts of armature windings are distributed corresponding to the salient poles of the rotor, magnetic fluxes penetrating through the series-connected windings are periodic magnetic fluxes with opposite directions, and the time difference is half of a period.
2. A brushless alternator according to claim 1, wherein: and the outer side of the stator core is respectively provided with an end cover which is fixedly connected, the end covers are connected with the shaft of the rotor through a bearing sleeve and a bearing, and the bearing sleeve is a magnetic isolation bearing sleeve.
3. A brushless alternator according to claim 2, wherein: the stator core is annular, and radial stator slots are respectively arranged on opposite surfaces of the stator core.
4. A brushless alternator according to claim 3, wherein: the annular excitation winding comprises an excitation support, the excitation winding is arranged on the excitation support, and two ends of the excitation support are fixedly connected with the peripheral parts of the end covers at two sides respectively; the stator cores are respectively fixedly connected with the end covers.
5. A brushless alternator according to claim 2, wherein: the stator core is cylindrical, and circumferential stator slots are respectively formed in the inner wall of the stator core.
6. A brushless alternator according to claim 5, wherein: the annular excitation winding comprises an excitation bracket, the excitation bracket is provided with the excitation winding, and two ends of the excitation bracket are respectively fixedly connected with the outer walls of the two stator cores; the outer end faces of the two ends of the excitation support are respectively and fixedly connected with the end covers on the two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010306936.2A CN111446784B (en) | 2020-04-17 | 2020-04-17 | Brushless alternating-current generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010306936.2A CN111446784B (en) | 2020-04-17 | 2020-04-17 | Brushless alternating-current generator |
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| Publication Number | Publication Date |
|---|---|
| CN111446784A true CN111446784A (en) | 2020-07-24 |
| CN111446784B CN111446784B (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010306936.2A Active CN111446784B (en) | 2020-04-17 | 2020-04-17 | Brushless alternating-current generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400854A (en) * | 2021-12-24 | 2022-04-26 | 江苏全电新能电气有限公司 | Homopolar four-phase brushless alternating-current generator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2901915A1 (en) * | 1979-01-18 | 1980-08-07 | Fischer & Porter Gmbh | Inductive flowmeter for conductive liq. - has evaluator circuit using only harmonic of measuring voltage generated by magnetic flux |
| CN1195918A (en) * | 1997-04-10 | 1998-10-14 | 袁训中 | Acyclic dc electric machine |
| CN104505961A (en) * | 2015-01-16 | 2015-04-08 | 山东理工大学 | Motor generator with external rotor |
| CN105553128A (en) * | 2016-01-25 | 2016-05-04 | 江苏大学 | Hybrid excitation flux switching motor |
| CN107707092A (en) * | 2017-08-22 | 2018-02-16 | 高纯军 | A kind of brushless AC generator and generation technology |
| CN107979255A (en) * | 2016-10-24 | 2018-05-01 | 南京理工大学 | A kind of Double-stator axial magnetic flow switched reluctance machines of big torque low pulse |
-
2020
- 2020-04-17 CN CN202010306936.2A patent/CN111446784B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2901915A1 (en) * | 1979-01-18 | 1980-08-07 | Fischer & Porter Gmbh | Inductive flowmeter for conductive liq. - has evaluator circuit using only harmonic of measuring voltage generated by magnetic flux |
| CN1195918A (en) * | 1997-04-10 | 1998-10-14 | 袁训中 | Acyclic dc electric machine |
| CN104505961A (en) * | 2015-01-16 | 2015-04-08 | 山东理工大学 | Motor generator with external rotor |
| CN105553128A (en) * | 2016-01-25 | 2016-05-04 | 江苏大学 | Hybrid excitation flux switching motor |
| CN107979255A (en) * | 2016-10-24 | 2018-05-01 | 南京理工大学 | A kind of Double-stator axial magnetic flow switched reluctance machines of big torque low pulse |
| CN107707092A (en) * | 2017-08-22 | 2018-02-16 | 高纯军 | A kind of brushless AC generator and generation technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400854A (en) * | 2021-12-24 | 2022-04-26 | 江苏全电新能电气有限公司 | Homopolar four-phase brushless alternating-current generator |
| CN114400854B (en) * | 2021-12-24 | 2024-04-05 | 高纯军 | Homopolar four-phase brushless alternating-current generator |
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| Publication number | Publication date |
|---|---|
| CN111446784B (en) | 2022-05-24 |
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Effective date of registration: 20230823 Address after: 214000 9-1103, hefengjiayuan, Huazhuang, Wuxi City, Jiangsu Province Patentee after: Gao Chunjun Address before: 214000 508-803, gaolang East Road, Binhu Economic Development Zone, Wuxi City, Jiangsu Province Patentee before: Wuxi Quandian Huiyuan electric partnership (limited partnership) |
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