Frequency conversion rectifier transformer with insulation structure
By dividing the variable frequency rectifier transformer coil into three sections and adjusting the height and phase shift angle, the coil distribution is optimized, solving the local temperature rise and noise problems caused by coil impedance imbalance, and achieving longer service life and operating efficiency.
Patent Information
- Application Number
- CN202422988110.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-04
AI Technical Summary
In existing variable frequency rectifier transformers, the unbalanced half-through impedance of the low-voltage coil leads to uneven coil load current, local temperature rise, local overheating, reduced service life, increased noise and vibration, uneven ampere-turn distribution, and poor short-circuit resistance.
The coil is divided into three sections axially: upper, middle and lower. Each section consists of a high-voltage coil and two low-voltage coils. The high-voltage coil is located between the low-voltage coils. The coil height and phase shift angle are adjusted, and the leads are led out through the insulating end rings to ensure that the turns ratio of the high-voltage coil and the low-voltage coil is similar, thereby optimizing the coil distribution.
The unbalance of the coil's semi-transmission impedance is reduced to ±5%, which prevents local overheating, prolongs service life, reduces additional losses, improves operating efficiency, reduces noise and vibration, and enhances short-circuit resistance.
Smart Images
Figure CN223462102U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to rectifier transformer field especially relates to an insulation structure frequency conversion rectifier transformer. BACKGROUND
[0002] The current frequency conversion rectifier transformer, transformer insulation structure such as Figure 1 The coil is divided into three sections in the axial direction, the first section is composed of a high-voltage upper coil, a low-voltage upper coil one and a low-voltage upper coil two, the second section is composed of a high-voltage middle coil, a low-voltage middle coil one and a low-voltage middle coil two, and the third section is composed of a high-voltage lower coil, a low-voltage lower coil one and a low-voltage lower coil two. The two low-voltage coils in each section are arranged in the axial direction. The low-voltage side is composed of a plurality of coils with different phase shift angles arranged in the axial direction of the transformer core. Since the positions of the low-voltage windings in the magnetic leakage field of the transformer are different, the impedances of the low-voltage coils are also different. The imbalance of the half-penetration impedance of the low-voltage coil is ± 10%. If the imbalance of the half-penetration impedance of the coil is too large, the load current of the coil during operation of the transformer will be uneven, which will cause the local temperature rise of the coil to be too high, the local overheating, the service life of the transformer to be reduced, the additional loss of the transformer to be increased, the operating efficiency of the transformer to be reduced, and noise and vibration to be generated. Since there is an insulation distance h3 between the two low-voltage coils in each section, the ampere-turns of the low-voltage coils and the high-voltage coils in each section cannot be evenly distributed, the ampere-turns balance deviation is large, and the short-circuit resistance of the coil is poor. SUMMARY
[0003] The utility model discloses an insulation structure frequency conversion rectifier transformer, reduces the local temperature rise of the coil, prolongs the service life of the transformer.
[0004] To achieve the above object, the utility model discloses the following technical scheme:
[0005] An insulation structure frequency conversion rectifier transformer, comprising a coil, the coil is divided into three sections in the axial direction, each section is composed of a high-voltage coil, a low-voltage coil one and a low-voltage coil two, the low-voltage coil one and the low-voltage coil two are arranged in the radial direction, and the high-voltage coil is located between the low-voltage coil one and the low-voltage coil two.
[0006] The height of the high-voltage coil satisfies:
[0007] The height of the high-voltage coil in the upper section is equal to the height of the high-voltage coil in the lower section, and the height of the high-voltage coil in the upper section is 1.1 times the height of the high-voltage coil in the middle section.
[0008] The height of the low-voltage coil one satisfies:
[0009] The height of the low-voltage coil one in the upper section is equal to the height of the low-voltage coil one in the lower section, and the height of the low-voltage coil one in the upper section is 1.1 times the height of the low-voltage coil one in the middle section.
[0010] The height of the low-voltage coil two satisfies:
[0011] The low-voltage coil two height of the upper section = the low-voltage coil two height of the lower section = 1.1 times the low-voltage coil two height of the middle section.
[0012] Further comprising an insulating end ring, an upper pressing plate and a lower supporting plate, the insulating end ring comprises an upper end ring, a middle end ring and a lower end ring, the upper end ring is arranged between the upper section and the upper pressing plate, the middle end ring is arranged between the upper section and the middle section and between the middle section and the lower section respectively, and the lower end ring is arranged between the lower section and the lower supporting plate.
[0013] The lead of the coil of the upper section, the middle section and the lower section is drawn out from the insulating end ring.
[0014] The phase-shifting angle of the low-voltage coil one of the upper section is +20°, and the phase-shifting angle of the low-voltage coil two of the upper section is -10°.
[0015] The basic angle of the low-voltage coil one of the middle section is 0°, and the basic angle of the low-voltage coil two of the middle section is 30°.
[0016] The phase-shifting angle of the low-voltage coil one of the lower section is +10°, and the phase-shifting angle of the low-voltage coil two of the lower section is -20°.
[0017] On the same height: the ratio of the coil turns of the high-voltage coil to the total coil turns of the high-voltage coil ≈ the ratio of the coil turns of the low-voltage coil one to the total coil turns of the low-voltage coil one ≈ the ratio of the coil turns of the low-voltage coil two to the total coil turns of the low-voltage coil two.
[0018] Compared with the prior art, the utility model has the advantages of:
[0019] 1. The insulation structure variable frequency rectifier transformer further optimizes the performance of the transformer, reduces the partial temperature rise of the coil to ± 5%, prevents local overheating, prolongs the service life of the transformer, reduces the additional loss of the transformer, improves the operation efficiency of the transformer, and reduces the noise and vibration generated by the transformer.
[0020] 2. The high-voltage coil and the two low-voltage coils of each section form two magnetic leakage groups, the end magnetic leakage is less, the current distribution in the coil is more uniform, there is no local loss, the partial temperature rise of the coil is reduced, the local overheating is prevented, the service life of the transformer is prolonged, the additional loss of the transformer is reduced, the operation efficiency of the transformer is improved, the noise and vibration generated by the transformer are reduced, and the energy saving and environmental protection are realized.
[0021] 3. The high-voltage coil height of the middle section in the utility model is slightly lower than the high-voltage coil height of the upper and lower sections, the low-voltage semi-penetration impedance of the three sections is closer, the semi-penetration impedance is reduced, the performance of the transformer is improved, and the operation reliability of the transformer is increased. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a structural schematic diagram of a conventional variable frequency rectifier transformer.
[0023] Figure 1 In the figure, 1-high voltage upper section coil 2-high voltage middle section coil 3-high voltage lower section coil 4-low voltage upper section coil one 5-low voltage upper section coil two 6-low voltage middle section coil one 7-low voltage middle section coil two 8-low voltage lower section coil one 9-low voltage lower section coil two.
[0024] Figure 2 is a structural schematic diagram of an insulation structure variable frequency rectifier transformer.
[0025] Figure 2 In the figure, 11-upper section high voltage coil 12-middle section high voltage coil 13-lower section high voltage coil 14-upper section low voltage coil one 15-upper section low voltage coil two 16-middle section low voltage coil one 17-middle section low voltage coil two 18-lower section low voltage coil one 19-lower section low voltage coil two 20-upper end coil 21-middle end coil 22-lower end coil 23-upper pressing plate 24-lower supporting plate 25-upper iron yoke 26-lower iron yoke. DETAILED DESCRIPTION
[0026] The utility model will be described in detail below in combination with the drawings of the specification, but it should be pointed out that the implementation of the utility model is not limited to the following implementation manners.
[0027] See Figure 2 An insulation structure variable frequency rectifier transformer, comprising a coil, the coil is axially divided into three sections of an upper section, a middle section and a lower section, the upper section is composed of an upper section high voltage coil 11, an upper section low voltage coil one 14 and an upper section low voltage coil two 15; the middle section is composed of a middle section high voltage coil 12, a middle section low voltage coil one 16 and a middle section low voltage coil two 17; and the lower section is composed of a lower section high voltage coil 13, a lower section low voltage coil one 18 and a lower section low voltage coil two 19. The two low voltage coils of each section are arranged radially, and the high voltage coil is located between the two low voltage coils.
[0028] The upper section and the lower section coil near the upper iron yoke 25 and the lower iron yoke 26 are basically the same in the influence of the transformer leakage magnetic field, and the middle section coil is less affected than the upper section and the lower section coil, so the low voltage coil half-penetration impedance of the upper section and the lower section is larger than that of the middle section. In order to make the half-penetration impedance of the three section coils closer and the imbalance degree of the half-penetration impedance of the three section coils smaller, the axial reactance of the upper section and the lower section coil near the iron yoke is designed to be 10% higher than that of the middle section coil,
[0029] The height of the high voltage coil satisfies:
[0030] The height H1 of the upper section high voltage coil 11 is equal to the height H3 of the lower section high voltage coil 13, and is equal to 1.1 times the height H2 of the middle section high voltage coil 12.
[0031] The height of the low-voltage coil satisfies: H4=H6=1.1*H5; that is:
[0032] The height of the upper low-voltage coil 14 equals the height of the lower low-voltage coil 18, which equals 1.1 times the height of the middle low-voltage coil 16.
[0033] The height of the upper low-voltage coil 15 equals the height of the lower low-voltage coil 19, which equals 1.1 times the height of the middle low-voltage coil 17.
[0034] The low-voltage semi-penetration impedance of the three groups of coils is closer, and the imbalance of the semi-penetration impedance is ±5%.
[0035] In addition, at the same height, the ratio of the number of turns of the high-voltage coil to the total number of turns of the high-voltage coil is approximately equal to the ratio of the number of turns of the low-voltage coil 1 to the total number of turns of the low-voltage coil 1, which is approximately equal to the ratio of the number of turns of the low-voltage coil 2 to the total number of turns of the low-voltage coil 2. Of course, since the coils are wound layer by layer, the above formula cannot be an equation (which is an ideal state) due to structural limitations during actual winding. The closer to the equation, the more uniform the ampere-turn distribution of the low-voltage coil 1, the low-voltage coil 2, and the high-voltage coil, the better the short-circuit resistance of the coil, the smaller the overall height of the transformer, and the easier the transportation.
[0036] The insulation structure of the frequency conversion rectifier transformer further comprises an insulation end ring, an upper pressing plate 23, and a lower supporting plate 24. The insulation end ring comprises an upper end ring 20, a middle end ring 21, and a lower end ring 22. The upper end ring 20 is arranged between the upper segment and the upper pressing plate 23. The middle end ring 21 is arranged between the upper segment and the middle segment and between the middle segment and the lower segment, respectively. The lower end ring 22 is arranged between the lower segment and the lower supporting plate 24. The leads of the coils of the upper segment, the middle segment, and the lower segment are led out from the insulation end ring.
[0037] The phase-shifting angle of the upper low-voltage coil 1 14 is +20°, and the phase-shifting angle of the upper low-voltage coil 2 15 is -10°.
[0038] The basic angle of the middle low-voltage coil 1 16 is 0°, and the basic angle of the middle low-voltage coil 2 17 is 30°.
[0039] The phase-shifting angle of the lower low-voltage coil 1 18 is +10°, and the phase-shifting angle of the lower low-voltage coil 2 19 is -20°.
[0040] The performance of the transformer is further optimized, the imbalance of the semi-penetration impedance of the coils is reduced to ±5%, the local temperature rise of the coils is reduced, local overheating is prevented, the service life of the transformer is prolonged, additional losses of the transformer are reduced, the operating efficiency of the transformer is improved, and the noise and vibration generated by the transformer are reduced.
Claims
1. An insulation structure of a variable frequency rectifier transformer, comprising a coil, which is divided into three sections of upper, middle and lower sections in an axial direction, each of which is composed of a high-voltage coil, a low-voltage coil I and a low-voltage coil II; characterized in that, The low-voltage coil one and the low-voltage coil two are arranged radially, and the high-voltage coil is located between the low-voltage coil one and the low-voltage coil two.
2. An isolation structure frequency conversion rectifier transformer according to claim 1, characterized in that, The height of the high-voltage coil satisfies: The high-voltage coil height of the upper section = the high-voltage coil height of the lower section = 1.1 x the high-voltage coil height of the middle section.
3. An isolation structure frequency conversion rectifier transformer as defined in claim 1, wherein, The height of the low-voltage coil one satisfies: The low-voltage coil one height of the upper section = the low-voltage coil one height of the lower section = 1.1 x the low-voltage coil one height of the middle section. The height of the low-voltage coil two satisfies: The low-voltage coil two height of the upper section = the low-voltage coil two height of the lower section = 1.1 x the low-voltage coil two height of the middle section.
4. An isolation structure frequency-transforming rectifier transformer according to claim 1, characterized in that The upper section, the middle section and the lower section further comprise an insulation end ring, an upper pressing plate and a lower supporting plate, the insulation end ring comprises an upper end ring, a middle end ring and a lower end ring, the upper end ring is arranged between the upper section and the upper pressing plate, the middle end ring is arranged between the upper section and the middle section and between the middle section and the lower section, and the lower end ring is arranged between the lower section and the lower supporting plate.
5. An isolation structure frequency transformer rectifier transformer as defined in claim 3, wherein, The lead wires of the coils of the upper section, the middle section and the lower section are led out from the insulation end ring.
6. An isolation structure frequency-transforming rectifier transformer according to claim 5, characterized in that The phase shift angle of the low-voltage coil one of the upper section is +20°, and the phase shift angle of the low-voltage coil two of the upper section is -10°. The basic angle of the low-voltage coil one of the middle section is 0°, and the basic angle of the low-voltage coil two of the middle section is 30°. The phase shift angle of the low-voltage coil one of the lower section is +10°, and the phase shift angle of the low-voltage coil two of the lower section is -20°.
7. An isolation structure frequency transformer rectifier transformer as defined in claim 1, wherein, At the same height: the ratio of the number of turns of the high-voltage coil to the total number of turns of the high-voltage coil ≈ the ratio of the number of turns of the low-voltage coil one to the total number of turns of the low-voltage coil one ≈ the ratio of the number of turns of the low-voltage coil two to the total number of turns of the low-voltage coil two.