CN219436734U - Generator winding for improving no-load line voltage waveform of generator - Google Patents
Generator winding for improving no-load line voltage waveform of generator Download PDFInfo
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- CN219436734U CN219436734U CN202223367640.5U CN202223367640U CN219436734U CN 219436734 U CN219436734 U CN 219436734U CN 202223367640 U CN202223367640 U CN 202223367640U CN 219436734 U CN219436734 U CN 219436734U
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Abstract
The utility model discloses a generator winding for improving the no-load line voltage waveform of a generator, which is a 36-slot 3-phase two-pole low-harmonic generator winding, and a coil group is formed by a first stator coil, a second stator coil, a third stator coil, a fourth stator coil, a fifth stator coil and a sixth stator coil. The beneficial effects of the utility model are as follows: the line voltage waveform is good, and the empty line voltage waveform distortion rate is low; under the condition that the number of stator slots and phases are fixed and a stator iron core or a rotor iron core inclines by one slot, the voltage waveform is influenced mainly by winding arrangement, the utility model relates to a 3-phase two-pole low-harmonic winding of a stator 36 slot, and the harmonic winding adopts a concentric unequal-turn double-layer winding type and can have the characteristic of low distortion rate of a line voltage waveform.
Description
Technical Field
The utility model relates to a motor winding, in particular to a generator winding for improving the no-load line voltage waveform of a generator.
Background
The harmonics are extremely dangerous. The harmonics reduce the efficiency of production, transmission and utilization of electrical energy, overheat electrical equipment, produce vibrations and noise, and age insulation, shortening the service life, even failure or burnout. The harmonic wave can cause local parallel resonance or series resonance of the power system, so that the harmonic content is amplified, and equipment such as a capacitor and the like is burnt. The harmonic wave can also cause relay protection and misoperation of an automatic device, so that the electric energy metering is disordered. For outside the power system, harmonics can cause serious interference to communication devices and electronic devices.
In general, the odd harmonics cause more damage than the even harmonics, and in balanced three-phase windings, due to the symmetrical relationship, even harmonics have been eliminated and only the odd harmonics are present. Therefore, in order to improve the no-load line voltage waveform of the generator, the content of odd harmonics is reduced.
Disclosure of Invention
The utility model aims to provide a generator winding for improving the no-load line voltage waveform of a generator, which has the characteristic of low line voltage waveform distortion rate and can improve the no-load line voltage waveform of the generator and reduce the content of odd harmonics.
The technical scheme adopted by the utility model is as follows: a generator winding for improving the no-load line voltage waveform of a generator is a 36-slot 3-phase two-pole low-harmonic generator winding, which consists of 6 concentric coils with unequal turns and spans, 6 groups are formed, each concentric coil consists of a first stator coil, a second stator coil, a third stator coil, a fourth stator coil, a fifth stator coil and a sixth stator coil, the turns of the concentric coils are respectively 7, 6,4, 2 and 1, and the spans are respectively 1-18, 2-17, 3-16, 4-15, 5-14 and 6-13.
The first stator coil is wound by 8 enamelled wires with phi of 1.25 for 7 circles, and the span is 17.
The second stator coil is wound by 8 enamelled wires with phi of 1.25 for 6 circles, and the span is 15.
The third stator coil is wound by 8 enamelled wires with phi of 1.25 for 4 circles, and the span is 13.
The fourth stator coil is wound by 8 enamelled wires with phi of 1.25 for 4 circles, and the span is 11.
The fifth stator coil is wound by 8 enamelled wires with phi of 1.25 for 2 circles, and the span is 9.
The sixth stator coil is wound by 8 enamelled wires with phi of 1.25 for 1 circle, and the span is 7.
The beneficial effects of the utility model are as follows: the line voltage waveform is good, and the empty line voltage waveform distortion rate is low; the calculation formula adopted in the utility model can be adopted to conveniently calculate the contents of each subharmonic and the total harmonic. Under the condition that the number of stator slots and phases are fixed and a stator iron core or a rotor iron core inclines by one slot, the voltage waveform is influenced mainly by winding arrangement, the utility model relates to a 3-phase two-pole low-harmonic winding of a stator 36 slot, and the harmonic winding adopts a concentric unequal-turn double-layer winding type and can have the characteristic of low distortion rate of a line voltage waveform. The low-harmonic winding on the market generally adopts a concentric type unequal-turn single-layer and double-layer winding, and the harmonic content is higher than that of the winding. With the winding of the utility model, the harmonic distortion rate of the no-load line voltage is only 0.66%.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is an expanded view of the winding of the present utility model.
In fig. 1, 1 first stator coil, 2 second stator coil, 3 third stator coil, 4 fourth stator coil, 5 fifth stator coil, 6 sixth stator coil; fig. 2 shows the insertion and connection of each stator coil.
Detailed Description
As shown in fig. 1-2, the windings of the present utility model are implemented as follows: a generator winding for improving the no-load line voltage waveform of a generator is a 36-slot 3-phase low-harmonic generator winding, 6 groups of concentric coils with unequal turns and spans are formed, the concentric coils comprise a first stator coil (1), a second stator coil (2), a third stator coil (3), a fourth stator coil (4), a fifth stator coil (5) and a sixth stator coil (6), the turns of the generator winding are 7, 6,4, 2 and 1 respectively, and the spans of the generator winding are 1-18, 2-17, 3-16, 4-15, 5-14 and 6-13 respectively.
The first stator coil is wound by 8 enamelled wires with phi of 1.25 for 7 circles, and the span is 17.
The second stator coil is wound by 8 enamelled wires with phi of 1.25 for 6 circles, and the span is 15.
The third stator coil is wound by 8 enamelled wires with phi of 1.25 for 4 circles, and the span is 13.
The fourth stator coil is wound by 8 enamelled wires with phi of 1.25 for 4 circles, and the span is 11.
The fifth stator coil is wound by 8 enamelled wires with phi of 1.25 for 2 circles, and the span is 9.
The sixth stator coil is wound by 8 enamelled wires with phi of 1.25 for 1 circle, and the span is 7.
The above design is not exclusive, but the harmonic content of the above design is calculated to be 0.66% at the lowest, e.g., the harmonic content is calculated to be 0.96% for coils with a 6,6,4,4,2,2 span of 17,15,13,9,7 each.
The coil inserting and wiring of the winding of the utility model are shown in figure 2; the calculation of the distortion rate of the idle line voltage waveform is shown in table 1.
Table 1 calculation of the distortion rate of the idle line voltage waveform of the present utility model.
Since the generator winding is star-connected, the line voltage waveform does not contain 3 and 3 times of odd harmonics, and since the amplitude of the harmonics is 1/harmonic of the fundamental wave, the 23 times of the harmonics can be ignored. The above table shows that the 5 th harmonic is larger, but the winding coefficient is low, so the 5 th harmonic content is low.
The main function of the harmonic magnetic field is magnetomotive harmonic magnetic field with the amplitude of F ν ＝3*2 0.5 *N*Kdp ν * I/pi/v. It is known that stator magnetomotive force harmonic magnetic field is mainly related to harmonic winding coefficients, namely, stator winding types, winding distribution and pitch. Therefore, a winding with lower harmonic content can be designed by selecting a proper winding type and winding pitch. According to the theory, a 36-slot 3-phase bipolar low-harmonic generator winding is designed.
Claims (7)
1. A generator winding for improving the no-load line voltage waveform of a generator is a 36-slot 3-phase two-pole low-harmonic generator winding, which consists of 6 concentric coils with unequal turns and spans, 6 groups are formed, each concentric coil consists of a first stator coil, a second stator coil, a third stator coil, a fourth stator coil, a fifth stator coil and a sixth stator coil, the turns of the concentric coils are respectively 7, 6,4, 2 and 1, and the spans are respectively 1-18, 2-17, 3-16, 4-15, 5-14 and 6-13.
2. A generator winding for improving the no-load line voltage waveform of a generator according to claim 1, wherein said first stator coil is wound 7 turns of 8 enamel insulated wires of 1.25 in span 17.
3. A generator winding for improving the no-load line voltage waveform of a generator according to claim 1, wherein the second stator coil is wound 6 turns of 8 enamelled wires of 1.25 phi, with a span of 15.
4. A generator winding for improving the no-load line voltage waveform of a generator according to claim 1, wherein the third stator coil is wound 4 turns with 8 enamelled wires of 1.25 a span of 13.
5. A generator winding for improving the no-load line voltage waveform of a generator according to claim 1, wherein the fourth stator coil is wound 4 turns with 8 enamelled wires of 1.25 a span of 11.
6. A generator winding for improving the no-load line voltage waveform of a generator according to claim 1, wherein the fifth stator coil is wound 2 turns of 8 enamelled wires of 1.25 phi, with a span of 9.
7. A generator winding for improving the no-load line voltage waveform of a generator according to claim 1, wherein the sixth stator coil is wound 1 turn with 8 enamelled wires of 1.25 a span of 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223367640.5U CN219436734U (en) | 2022-12-15 | 2022-12-15 | Generator winding for improving no-load line voltage waveform of generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223367640.5U CN219436734U (en) | 2022-12-15 | 2022-12-15 | Generator winding for improving no-load line voltage waveform of generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219436734U true CN219436734U (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223367640.5U Active CN219436734U (en) | 2022-12-15 | 2022-12-15 | Generator winding for improving no-load line voltage waveform of generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219436734U (en) |
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2022
- 2022-12-15 CN CN202223367640.5U patent/CN219436734U/en active Active
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