CN111756142A - Single-phase generator short-circuit current limiting structure - Google Patents
Single-phase generator short-circuit current limiting structure Download PDFInfo
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- CN111756142A CN111756142A CN202010547885.2A CN202010547885A CN111756142A CN 111756142 A CN111756142 A CN 111756142A CN 202010547885 A CN202010547885 A CN 202010547885A CN 111756142 A CN111756142 A CN 111756142A
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- 238000004804 winding Methods 0.000 claims abstract description 107
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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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
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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Abstract
The invention provides a short-circuit current limiting structure of a single-phase generator; the winding comprises at least two groups of single-phase windings, wherein each group of windings is wound on a plurality of teeth, the number of teeth of at least one group of windings is integral multiple of more than two times of the number of teeth of the other group of windings, and a coil on at least one tooth in each group of windings is reversely wound relative to coils on other teeth. The invention can ensure that the short-circuit current is effectively limited when the short-circuit condition occurs in the working process of the generator, thereby improving the running reliability of the motor.
Description
Technical Field
The invention relates to a short-circuit current limiting structure of a single-phase generator.
Background
With the research and development of full-electric and multi-electric airplane technologies, airborne equipment increasingly uses electric energy provided by a generator as secondary energy, and has the characteristics of convenience and quickness in energy transmission, simplicity and convenience in control and simplicity in adjustment and transformation, and meanwhile, a power supply system adopting the generator has more excellent performance in performance, volume and capacity and has better maintainability and reliability.
A permanent magnet synchronous alternator is a device for converting kinetic energy into electrical energy, and generally comprises a stator and a rotor, wherein permanent magnets are arranged on the rotor, and a power supply winding is arranged on the stator. When the generator works, the external driving equipment drags the motor rotor to rotate, the stator winding generates induction voltage in a rotating magnetic field, and after the stator winding is connected with electric equipment, a loop is formed to provide electric energy for the electric equipment.
Because airborne equipment installation space is limited, for the maximize utilization space, adopt integrated technology more, integrate a plurality of functions on one set of equipment, show that for a plurality of equipment power supply simultaneously by a generator. In order to realize the multifunctional integration technology of the generator, the stator windings are divided into a plurality of sets and provide different electric energy respectively, and the biggest problem existing in the mode is that when one electric device has a short-circuit fault, the generated short-circuit current is large, so that the generator can generate heat sharply, the insulation of the generator is damaged, even the generator is on fire, and the use safety of the whole device is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a short-circuit current limiting structure of a single-phase generator, which can effectively reduce the short-circuit current of the generator and ensure that the generator has a standby winding to supply power normally under the condition of a fault.
The invention is realized by the following technical scheme.
The invention provides a short-circuit current limiting structure of a single-phase generator; the winding comprises at least two groups of single-phase windings, wherein each group of windings is wound on a plurality of teeth, the number of teeth of at least one group of windings is integral multiple of more than two times of the number of teeth of the other group of windings, and a coil on at least one tooth in each group of windings is reversely wound relative to coils on other teeth.
In the multiple groups of single-phase windings, the number of teeth wound by one group with the largest number of teeth is a multiple of four.
In the multiple groups of single-phase windings, the number of teeth wound by any one group is a multiple of two.
And at least two groups of single-phase windings are arranged in the multiple groups of single-phase windings, and teeth where the windings are arranged in one group are uniformly distributed relative to teeth where the windings are arranged in the other group.
In the multiple groups of single-phase windings, the number of turns of the coil in any one group of single-phase windings has at least two specifications of the number of turns.
The single-phase windings are three groups.
The number of the teeth is 18.
The number of teeth wound by the three groups of single-phase windings is respectively 12, 4 and 2.
The invention has the beneficial effects that: according to the invention, the generator under the same condition can reduce the short-circuit current of the generator and reduce the manufacturing cost of the motor by only changing the winding mode and the wire diameter of the enameled wire.
Drawings
FIG. 1 is a stator tooth distribution diagram for an electric machine according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of the winding arrangement of the first group of single-phase windings in the above embodiment;
FIG. 3 is a schematic diagram of the winding arrangement of the second group of single-phase windings in the above embodiment;
fig. 4 is a schematic diagram of the winding arrangement of the third group of single-phase windings in the above embodiment.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
The invention provides a short-circuit current limiting structure of a single-phase generator; the winding comprises at least two groups of single-phase windings, wherein each group of windings is wound on a plurality of teeth, the number of teeth of at least one group of windings is integral multiple of more than two times of the number of teeth of the other group of windings, and a coil on at least one tooth in each group of windings is reversely wound relative to coils on other teeth.
In the multiple groups of single-phase windings, the number of teeth wound by one group with the largest number of teeth is a multiple of four.
In the multiple groups of single-phase windings, the number of teeth wound by any one group is a multiple of two.
In the multiple groups of single-phase windings, at least two groups of single-phase windings are arranged, and teeth where the windings are arranged in one group are uniformly distributed relative to teeth where the windings are arranged in the other group.
In the multiple groups of single-phase windings, the number of turns of the coil in any one group of single-phase windings has at least two specifications of the number of turns.
Examples
By adopting the scheme, the single-phase windings are in three groups, and one specific implementation scheme is shown in figures 1 to 4.
As shown in fig. 1, 18 uniformly distributed slots are formed in the stator core, and the stator winding is embedded in the stator core and adopts a concentrated winding arrangement mode.
The winding teeth include a first tooth 1, a second tooth 2, a third tooth 3, a fourth tooth 4, a fifth tooth 5, a sixth tooth 6, a seventh tooth 7, an eighth tooth 8, a ninth tooth 9, a tenth tooth 10, an eleventh tooth 11, a twelfth tooth 12, a thirteenth tooth 13, a fourteenth tooth 14, a fifteenth tooth 15, a sixteenth tooth 16, a seventeenth tooth 17 and an eighteenth tooth 18.
The windings on the stator teeth are divided into three groups, which are respectively marked as A, B, C and are all single-phase windings, and the three groups of single-phase windings respectively provide single-phase alternating current power supplies to the outside.
And the three groups of single-phase windings are wound by adopting enameled wires, and one enameled wire is wound from the first tooth to the last tooth of each group of windings.
The winding process is carried out in a winding arrangement mode, so that the groove utilization rate and the output performance stability are improved.
The formula of the externally output no-load voltage of the generator is as follows:
E＝4.44fWK1Φ (1)
wherein: e is the output potential in units V, K1Is the winding coefficient, W is the winding turns, phi is the air gap flux, unit Wb; f is frequency in Hz;
the short-circuit current calculation formula of the generator is as follows:
wherein: i is short-circuit current, unit A; e1Is the potential, unit V; r isaIs resistance, unit Ω; xσIs inductive reactance in omega.
Three groups of single-phase windings:
as shown in fig. 2, the stator teeth wound by the a set of single-phase windings are: the 1 st tooth, the 2 nd tooth, the 4 th tooth, the 5 th tooth, the 7 th tooth, the 8 th tooth, the 10 th tooth, the 11 th tooth, the 13 th tooth, the 14 th tooth, the 16 th tooth, the 17 th tooth.
A set of single-phase windings: every two adjacent teeth can form a small group of teeth, wherein forward voltage is provided for forward winding on the 1 st tooth, the 2 nd tooth, the 4 th tooth, the 5 th tooth, the 7 th tooth, the 8 th tooth, the 10 th tooth, the 11 th tooth, the 13 th tooth and the 14 th tooth, and reverse voltage is provided for reverse winding on the 16 th tooth and the 17 th tooth.
The effective number of turns of the A set of windings for generating no-load voltage externally is (68+26) × 5- (60+28) ═ 382 turns.
Therefore, the A set of windings are reversely wound on the 16 th tooth and the 17 th tooth, and the resistance r of the A set of windings can be increasedaIncreasing the inductive reactance X on the windingσAnd simultaneously, the electric potential E generated by the rest teeth windings can be counteracted.
And the A set of windings are welded and led out at the 1 st tooth wire inlet position and the 17 th tooth wire outlet position by adopting lead-out wires.
As shown in fig. 3, the stator teeth wound by the B sets of single-phase windings are: the 3 rd tooth, the 6 th tooth, the 9 th tooth and the 12 th tooth; and the coil is wound on the 3 rd tooth, the 6 th tooth and the 9 th tooth in the forward direction, and the coil is wound on the 12 th tooth in the reverse direction.
The effective number of turns for generating no-load voltage outside the winding pair in the B set is 101+12+ 101-12-202 turns.
The twelfth tooth upper coil for the B set of windings is reversely wound so as to increase the resistance r of the B set of windingsaAnd inductive reactance XσAnd the electric reactance on the lifting winding can offset the voltage E generated by the windings of the third tooth, the sixth tooth and the ninth tooth at the same time.
And the B set of windings are welded and led out at the 3 rd tooth wire inlet position and the 12 th tooth wire outlet position by adopting lead-out wires.
As shown in fig. 4, the stator teeth wound by the C-set single-phase winding are the 15 th tooth and the 18 th tooth.
The C set of single-phase winding is wound on the 15 th tooth in the forward direction, the coil is wound on the 18 th tooth in the reverse direction, and the reverse winding aims to increase the resistance r of the C set of windingaAnd inductive reactance XσLowering the potential E;
the effective number of turns of the C set of single-phase winding pairs for generating no-load voltage is 93-59-34 turns.
And the C set of single-phase windings are welded and led out at the 15 th tooth wire inlet position and the 18 th tooth wire outlet position by adopting lead-out wires.
From this, compare with conventional single-phase generator, because winding resistance and inductance increase, when the generator takes place the short circuit condition, generator short-circuit current obtains the restriction, 3 sets of single-phase winding of supporting in the motor, when the short circuit condition appears in a set of winding load, less short-circuit current can not lead to the generator serious that generates heat, and then guarantees the normal work of all the other windings of generator, guarantees the normal power supply of surplus winding, guarantees the reliable and stable of generator and power supply system.
Therefore, by adopting the scheme of the application, the short-circuit current of the motor can be reduced and the production cost of the motor can be reduced only by changing the winding mode of the motor under the condition of the same parameters.
Claims (8)
1. The utility model provides a single-phase generator short-circuit current limit structure which characterized in that: the winding comprises at least two groups of single-phase windings, wherein each group of windings is wound on a plurality of teeth, the number of teeth of at least one group of windings is integral multiple of more than two times of the number of teeth of the other group of windings, and a coil on at least one tooth in each group of windings is reversely wound relative to coils on other teeth.
2. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: in the single-phase winding, the number of teeth wound by a group with the largest number of teeth is a multiple of four.
3. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: in the single-phase winding, the number of teeth wound by any one group is a multiple of two.
4. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: in the single-phase windings, at least two groups of single-phase windings are arranged, and teeth where the windings are arranged in one group are uniformly distributed relative to teeth where the windings are arranged in the other group.
5. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: in the single-phase winding, the number of turns of the coil in any one group of single-phase winding has at least two specifications of the number of turns.
6. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: the single-phase windings are three groups.
7. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: the number of the teeth is 18.
8. The short-circuit current limiting structure of a single-phase generator as set forth in claim 1, wherein: the number of teeth wound by the three groups of single-phase windings is respectively 12, 4 and 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010547885.2A CN111756142A (en) | 2020-06-16 | 2020-06-16 | Single-phase generator short-circuit current limiting structure |
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| CN202010547885.2A CN111756142A (en) | 2020-06-16 | 2020-06-16 | Single-phase generator short-circuit current limiting structure |
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| CN111756142A true CN111756142A (en) | 2020-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4287467A1 (en) * | 2022-05-31 | 2023-12-06 | Ovalo GmbH | Electric motor system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001327134A (en) * | 2000-05-17 | 2001-11-22 | Fujitsu General Ltd | Capacitor induction motor |
| CN2655498Y (en) * | 2003-09-25 | 2004-11-10 | 岳群生 | Single-phase rare-earth permanent magnetic generator |
| US20070057592A1 (en) * | 2005-09-14 | 2007-03-15 | Bhargava Brij B | Redundant windings with current limiting means for electric machines |
-
2020
- 2020-06-16 CN CN202010547885.2A patent/CN111756142A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001327134A (en) * | 2000-05-17 | 2001-11-22 | Fujitsu General Ltd | Capacitor induction motor |
| CN2655498Y (en) * | 2003-09-25 | 2004-11-10 | 岳群生 | Single-phase rare-earth permanent magnetic generator |
| US20070057592A1 (en) * | 2005-09-14 | 2007-03-15 | Bhargava Brij B | Redundant windings with current limiting means for electric machines |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4287467A1 (en) * | 2022-05-31 | 2023-12-06 | Ovalo GmbH | Electric motor system |
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