Rotary transformer and rotary machine comprising such a rotary transformer
By dividing the coils into sub-coils and adjusting their arrangement in the slots in a three-phase rotary transformer, the magnetic coupling and leakage flux are optimized, solving the problems of large size and phase imbalance, and realizing a rotary transformer with smaller size and better current balance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SAFRAN AIRCRAFT ENGINES SAS
- Filing Date
- 2020-11-19
- Publication Date
- 2026-04-28
Smart Images
Figure CN114830271B_ABST
Abstract
Description
[0001] manual Technical Field
[0002] This invention relates to the field of rotary transformers and rotating machines including such transformers.
[0003] Therefore, more specifically, the present invention relates to an optimized compact rotary transformer and a rotating machine including such a rotary transformer. Background Technology
[0004] A rotary transformer 2 is a transformer capable of transmitting electrical energy between two components 4 and 5 that rotate relative to each other, for example, between the stator section 5 and the rotor section 4 of a rotating machine 1. In the context of a three-phase rotary transformer 2 and conventional constructions, this type of transformer includes:
[0005] -At least the first primary coil 11, the second primary coil 12 and the third primary coil 13;
[0006] - The first primary coil 21, the second primary coil 22, and the third primary coil 23 respectively correspond to the first primary coil 11, the second primary coil 12, and the third primary coil 13;
[0007] - Primary body 30, made of ferromagnetic material and formed as a solid rotating about axis 3; and
[0008] - Secondary body 40, made of ferromagnetic material and forming a rotating entity, is concentric with primary body 30 such that one of primary body 30 and secondary body 40 rotates about rotation axis 2, while the other of primary body 30 and secondary body 40 rotates about rotation axis 2.
[0009] The primary body 30 includes a first slot 31, a second slot 32, and a third slot 33, which are open to the secondary body 40. The first primary coil 11, the second primary coil 12, and the third primary coil 13 are respectively arranged in the first slot 31, the second slot 32, and the third slot 33.
[0010] The secondary body 40 includes a first primary slot 41, a second primary slot 42, and a third primary slot 43, which are open to the first primary coil 11, the second primary coil 12, and the third primary coil 13, respectively. The first primary coil 21, the second primary coil 22, and the third primary coil 23 are respectively arranged in the first primary slot 41, the second primary slot 42, and the third primary slot 43.
[0011] In this way, the current of each phase of the primary winding can be transferred individually from the primary winding to the corresponding secondary winding, thereby transferring power from section 5, equipped with primary windings 11, 12, and 13, to section 4 of the rotating machine, equipped with secondary windings 21, 22, and 23. However, this rotary transformer 2 has the disadvantage of generally including particularly high mass and size.
[0012] Therefore, in order to limit the size and weight of this transformer 102, reference WO 2013167827 has already... Figure 3 As shown, the following is proposed:
[0013] - Divide each of the first primary coil, second primary coil, third primary coil, first stage coil, second stage coil, and third stage coil into a first sub-coil and a second sub-coil;
[0014] - Associate one sub-coil of each of the second primary coil and the third primary coil with the first sub-coil and the second sub-coil of the first primary coil, respectively, in a common slot of the primary body, and the other sub-coil of each of the second primary coil and the third primary coil is housed in a slot specific to itself;
[0015] - Associate one sub-coil of each of the second-stage and third-stage coils with the first and second sub-coils of the first-stage coil, respectively, in a common slot of the primary body, with another sub-coil of each of the second-stage and third-stage coils housed in its own slot.
[0016] With this construction, optimized flux coupling can be achieved based on the appropriate winding direction of each sub-coil, thereby enabling a reduction in the size and mass of the transformer.
[0017] It is worth noting that the same method is disclosed in document WO 2013 / 167829 with a construction from three phases to two phases.
[0018] To optimize the construction disclosed in document WO 2013 / 167827, document WO 2013 / 167828, as follows: Figure 2 and Figure 3 As shown, it is proposed to optimize flux coupling by associating the second primary coil 112, which is in the form of the first primary sub-coil 112A and the second primary sub-coil 112B, with each of the first primary coil 111 and the third primary coil 113, and by applying a similar construction to the secondary coils 121, 122, and 123.
[0019] In this configuration, the first primary sub-coil 112A and the first primary coil 111 are housed in the first slot 131 of the primary body 130, and the second primary sub-coil 112B and the third primary coil 113 are housed in the second slot 132 of the primary body 130. The secondary body 140 has a similar configuration, therefore, the first primary sub-coil 122A and the first primary coil 121 are housed in the first slot 141 of the secondary body 140, and the second primary sub-coil 122B and the third primary coil 123 are housed in the second slot 142 of the secondary body 140.
[0020] It should be noted that in this configuration, in order to balance the transformation coefficients of each phase, each of the first sub-coil 112A and the second sub-coil 112B needs to have the same number of turns as the first primary coil 111 and the third primary coil 113. Therefore, in order to make each of the first primary coil 111, the second primary coil 112, and the third primary coil 113 have the same impedance, the first sub-coil 112A and the second sub-coil 112B have a thickness of 2h, which is twice the thickness h of the first primary coil 111 and the third primary coil 113. This is so that the axial dimension L between the first primary sub-coil 112A and the second primary sub-coil 112B and the first primary coil 111 and the third primary coil 113 is the same.
[0021] Of course, since the secondary coils 121, 122, and 123 have similar constructions, the same dimensions of the primary coils 112A and 112 / primary coils 111 and 113 also apply to the secondary coils 121, 122, and 123.
[0022] Because this thickness difference also exists in the secondary coils 121, 122, and 123, which have similar structures, a high and unbalanced leakage flux is generated between the coils and sub-coils. This imbalance in the leakage flux between the coils and sub-coils leads to an electrical imbalance between the phases, typically greater than 5%, which reduces interest in the structure proposed in document WO2013 / 167828. Summary of the Invention
[0023] The purpose of this invention is to overcome the above-mentioned disadvantages, and therefore, to provide an optimized and electrically balanced three-phase rotary transformer while maintaining the reduced size offered by prior art three-phase rotary transformers.
[0024] Therefore, the present invention relates to a three-phase rotary transformer, the three-phase rotary transformer comprising:
[0025] -At least a first primary coil, a second primary coil, and a third primary coil;
[0026] - The first primary coil, the second primary coil, and the third primary coil correspond to the first primary coil, the second primary coil, and the third primary coil, respectively;
[0027] - The primary body, made of ferromagnetic material and formed into a solid that rotates around an axis of rotation; and
[0028] - A secondary body, made of ferromagnetic material and forming a rotating entity, is concentric with the primary body, such that one of the primary and secondary bodies rotates about the other of the primary and secondary bodies by rotating about an axis of rotation.
[0029] The second primary coil includes at least a first primary sub-coil and a second primary sub-coil, and the second-stage coil includes at least a first-stage sub-coil and a second-stage sub-coil.
[0030] The primary body includes a first primary slot and a second primary slot, each of which has an opening that faces the secondary body. The secondary body includes a first primary slot and a second primary slot, each of which has an opening that faces the first primary slot and the second primary slot, respectively.
[0031] Each of the first primary groove and the second primary groove includes a first annular shell and a second annular shell arranged radially continuously from the opening of the primary groove.
[0032] Each of the first-stage and second-stage grooves includes a first annular shell and a second annular shell arranged radially continuously from the opening of the second-stage groove.
[0033] The first primary slot accommodates the first primary sub-coil and the first primary coil. The first primary sub-coil is arranged within one of the first and second housings of the first primary slot, and the first primary coil is arranged within the other of the first and second housings of the first primary slot.
[0034] The second primary slot houses the second primary sub-coil and the third primary coil. The second primary sub-coil is arranged within one of the first and second housings of the second primary slot, and the third primary coil is arranged within the other of the first and second housings of the second primary slot.
[0035] The first-stage slot accommodates the first-stage sub-coil and the first-stage coil. The first-stage sub-coil is arranged within one of the first and second housings of the first-stage slot, and the first-stage coil is arranged within the other of the first and second housings of the first-stage slot.
[0036] The second-stage slot accommodates the second-stage sub-coil and the third-stage coil. The second-stage sub-coil is arranged within one of the first and second housings of the second-stage slot, and the third-stage coil is arranged within the other of the first and second housings of the second-stage slot.
[0037] Wherein, for the first primary slot and the second primary slot, the axial dimension of the housing accommodating the primary sub-coil in the first housing and the second housing is greater than the axial dimension of the other housing in the first housing and the second housing, and
[0038] Among them, for the first primary slot and the second primary slot, the axial dimension of the housing that accommodates the secondary coil in the first housing and the second housing is greater than the axial dimension of the other housing in the first housing and the second housing.
[0039] By adjusting the configuration of the first primary sub-coil, the second primary sub-coil, the first primary coil, and the third primary coil in this three-phase rotary transformer, leakage flux can be balanced, thereby optimizing the transformation ratio between different phases. Therefore, compared to existing three-phase rotary transformers, an optimized three-phase rotary transformer with a smaller size can be provided.
[0040] Of course, it should be noted that, according to the construction rules of a three-phase rotary transformer, the first primary coil, the second primary coil, and the third primary coil have the same impedance, and the first primary sub-coil, the second primary sub-coil, the first primary coil, and the third primary coil have the same number of turns.
[0041] Therefore, the axial dimension of the housing of each sub-coil, and thus the axial dimension of the primary sub-coil itself, is greater than the axial dimension of the housing of the second and third primary coils, and thus greater than the axial dimension of the second and third primary coils. The radial dimension of these identical housings of each sub-coil, and thus the radial dimension of each sub-coil, is less than twice the radial dimension of the housing of the first and third primary coils, and thus less than twice the radial dimension of those identical primary coils.
[0042] The descriptions above regarding the dimensions of the housing of the primary sub-coil, the first primary coil, and the third primary coil also apply to the dimensions of the housing of the secondary sub-coil, the first primary coil, and the third primary coil.
[0043] Each of the first primary sub-coil and the second primary sub-coil can be accommodated in a corresponding first housing in the first primary slot and the second primary slot.
[0044] Each of the first-stage sub-coil and the second-stage sub-coil is housed in a corresponding first housing in the first-stage slot and the second-stage slot, respectively.
[0045] This construction allows for the easy manufacture of the rotary transformer according to the present invention.
[0046] The first and second housings of each of the first primary groove, second primary groove, first stage groove, and second stage groove may also have axial dimensions.
[0047] In each of the first and second primary slots, the housing accommodating the sub-coil of the second primary coil has:
[0048] - Axial dimension, which is equal to r2 multiplied by the axial dimension of the other shell in the first and second shells; and
[0049] - Radial dimension, which is equal to 2 / r² multiplied by the radial dimension of the other shell in the first and second shells.
[0050] r is called the balance factor of magnetic flux.
[0051] This construction ensures good current balance among the first, second, and third primary coils, as well as good current balance among the first, second, and third primary coils.
[0052] The flux balance factor can be determined to balance the current between the first primary coil, the second primary coil, and the third primary coil, as well as to balance the current between the first secondary coil, the second secondary coil, and the third secondary coil.
[0053] Therefore, it is necessary to optimize the balance between the phases.
[0054] In particular, this balancing can be performed to obtain a current difference between each phase of the primary and between each phase of the secondary that is less than 5%, or optionally less than 2%, and more preferably less than or equal to 1%.
[0055] The first and second housings of the first and second primary grooves can be accommodated in the cavity of the primary groove.
[0056] The cavity in each of the first and second primary slots has an axial dimension equal to the axial dimension of the housing that accommodates the primary sub-coil in the primary slot of the first and second housings, and the cavity includes walls made of a ferromagnetic material to axially define the other of the first and second housings.
[0057] The first and second housings of the first-stage and second-stage grooves are housed within the cavities of the grooves.
[0058] The cavity in each of the first and second stage slots has an axial dimension equal to the axial dimension of the housing that houses the secondary sub-coil in the first and second housings, and the cavity includes a wall made of ferromagnetic material to axially define the other housing in the first and second housings.
[0059] In a half-view of the axial cross-section, the primary body may have:
[0060] - A central portion, the axial dimensions of which are configured to fully accommodate the housings in the first primary slot and the second primary slot, but not to accommodate any primary sub-coils, wherein the housings in the first primary slot and the second primary slot that accommodate the primary sub-coils are partially accommodated in the central portion;
[0061] - A first axial shoulder and a second axial shoulder extend axially on opposite sides of the central portion, respectively, and the dimensions of the first axial shoulder and the second axial shoulder are configured to accommodate the portion of each housing that is not accommodated in the central portion.
[0062] In the half-view of the axial cross-section, the secondary body has:
[0063] - A central portion, the axial dimensions of which are configured to fully accommodate the housings in the first and second stage slots without accommodating any secondary sub-coils, the housings in the first and second stage slots that accommodate the secondary sub-coils being partially accommodated in the central portion;
[0064] - A first axial shoulder and a second axial shoulder extend axially on opposite sides of the central portion, respectively, and the dimensions of the first axial shoulder and the second axial shoulder are configured to accommodate the portion of each housing that is not accommodated in the central portion.
[0065] This design allows for optimization of the dimensions of both the primary and secondary transformers, thereby optimizing the transformer's dimensions.
[0066] The present invention also relates to a rotating machine comprising a stator, a rotor, and a transformer according to the invention, wherein a primary body is included in one of the stator and the rotor, and a secondary body is included in the other of the stator and the rotor.
[0067] This rotating machine benefits from the advantages associated with the transformer according to the invention that is equipped with this rotating machine.
[0068] Rotating machines can be turbines.
[0069] The primary body may be included in the stator, and the secondary body is included in the rotor.
[0070] The first-stage coil, second-stage coil, and third-stage coil provide blade de-icing circuitry to at least one of the turbine's inlet and outlet nozzles.
[0071] This type of turbine, particularly in this application of blade de-icing circuits, benefits especially from improvements in the balance of current in the secondary phase and the primary phase, while maintaining the dimensions contained in the prior art. Attached Figure Description
[0072] The invention will be better understood by referring to the description of exemplary embodiments given purely indicatively and in no way limiting, in the accompanying drawings, in which:
[0073] Figure 1 This is a schematic cross-sectional view illustrating a prior art three-phase rotary transformer.
[0074] Figure 2 This is a schematic cross-sectional view showing a three-phase rotary transformer according to the inventor's design, which is not included within the scope of this invention.
[0075] Figure 3 It shows that according to Figure 2 The common connection between the inventor's proposed structure and the structure according to the invention is the relationship between the primary and secondary coils of the three-phase rotary transformer.
[0076] Figure 4 This is a schematic cross-sectional view showing a three-phase rotary transformer according to a first embodiment of the present invention.
[0077] Figure 5 The following are shown respectively for... Figure 2 The magnetic flux distribution of the three-phase rotary transformer proposed by the inventor and the three-phase rotary transformer according to the first embodiment of the present invention is shown.
[0078] Figure 6 The diagram shows the variation in the current sent to each secondary coil, a variation that is a function of a term called the magnetic flux balance factor.
[0079] Figure 7 This is a schematic semi-axial cross-sectional view of a rotary transformer according to a second embodiment of the present invention.
[0080] Figure 8 This is a schematic half-axial cross-sectional view of a rotary transformer according to a third embodiment of the present invention.
[0081] Parts that are identical, similar, or equivalent to those in the various figures have the same reference numerals to facilitate switching from one figure to another. The parts shown in the figures are not necessarily at a uniform scale to make the figures easier to read.
[0082] Various possibilities (variations and embodiments) must be understood as not mutually exclusive, but rather as combinations thereof. Detailed Implementation
[0083] Figure 3 and Figure 4 A three-phase rotary transformer 202 according to a first embodiment is shown. Figure 3 The diagram illustrates the relationship between the windings of the first primary coil 211, the second primary coil 212, and the third primary coil 213 and the windings of the first primary coil 221, the second primary coil 222, and the third primary coil 223. Figure 4 The construction of this three-phase rotary transformer 202 is shown.
[0084] Such a three-phase rotary transformer 202 is typically installed on a rotating machine 201 such as an engine or turbine, and is capable of transmitting electrical energy between a stator 205 and a rotor 204, which are mounted so as to be rotatable relative to each other about a rotation axis 203.
[0085] Therefore, as Figure 4 As shown, the three-phase rotary transformer 201 includes:
[0086] - The first primary coil 211, the second primary coil 212, and the third primary coil 213, for example, correspond to the first phase, the second phase, and the third phase of the power supply circuit, respectively;
[0087] - The first primary coil 221, the second primary coil 222, and the third primary coil 223 correspond to the first primary coil 211, the second primary coil 212, and the third primary coil 213, respectively. For example, the first primary coil 221, the second primary coil 222, and the third primary coil 223 correspond to the first phase, the second phase, and the third phase of the load circuit to be supplied with current, respectively.
[0088] - Primary body 230, made of ferromagnetic material and formed as a solid rotating about axis 230; and
[0089] - Secondary body 240, made of ferromagnetic material and forming a rotating entity, is concentric with primary body 230 such that one of primary body 230 and secondary body 240 rotates about the other of primary body 230 and secondary body 240 by rotating about rotation axis 203.
[0090] It can be noted that in this embodiment, the primary body 230 rotates around the secondary body 240, the primary body 230 is included in the stator 205, and the secondary body 240 is included in the rotor 204.
[0091] like Figure 3 and Figure 4 As shown, the second primary coil 212 includes a first primary sub-coil 212A and a second primary sub-coil 212B, and the second primary coil 222 includes a first primary sub-coil 222A and a second primary sub-coil 222B.
[0092] The primary body 230 includes a first primary groove 231 and a second primary groove 232, each of which has an opening that faces the secondary body 240. The secondary body 240 includes a first primary groove 241 and a second primary groove 242, each of which has an opening that faces the first primary groove 231 and the second primary groove 232, respectively.
[0093] like Figure 3 and Figure 4 As shown, the first primary slot 231 accommodates the first primary sub-coil 212A and the first primary coil 211, while the second primary slot accommodates the second primary sub-coil 212B and the third primary coil 213.
[0094] In a similar manner, the first stage slot 241 accommodates the first stage sub-coil 222A and the first stage coil 221, while the second stage slot accommodates the second stage sub-coil 222B and the third stage coil 223.
[0095] In this first embodiment, as Figure 4 As shown, each of the first primary groove 231 and the second primary groove 232, as well as each of the first stage groove 241 and the second stage groove 242, has an annular shape with a rectangular cross-section.
[0096] like Figure 4 As shown, each of the first primary groove 231 and the second primary groove 232 includes a first annular shell 231A, 232A and a second annular shell 231B, 232B arranged radially continuously from the openings of the primary grooves 231, 232.
[0097] In this first embodiment, the first housing 231A and the second housing 231B of the first primary slot 231 respectively accommodate the first primary sub-coil 212A and the first primary coil 211. The first housing 232A and the second housing 232B of the second primary slot 232 respectively accommodate the second primary sub-coil 212B and the third primary coil 213.
[0098] Each of the first-stage groove 241 and the second-stage groove 242 includes a first annular housing 241A, 242A and a second annular housing 241B, 242B arranged radially continuously from the openings of the second-stage grooves 241, 242.
[0099] Therefore, in the same manner as the first primary slot 231 and the second primary slot 232, in this first embodiment, the first housing 241A and the second housing 241B of the first primary slot 241 respectively accommodate the first stage sub-coil 222A and the first stage coil 221. The first housing 242A and the second housing 242B of the second primary slot 242 respectively accommodate the second stage sub-coil 222B and the third primary coil 223.
[0100] In this way, the first primary coil 211, the second primary coil 212, and the third primary coil 213 are presented with the first secondary coil 221, the second secondary coil 222, and the third secondary coil 223. Figure 3 The magnetic correlation shown is as follows:
[0101] - The first primary sub-coil 212A and the first primary coil 211 are magnetically coupled to the first primary sub-coil 222A and the first primary coil 221;
[0102] - The second primary coil 212B and the third primary coil 213 are magnetically coupled to the second secondary coil 222B and the third secondary coil 223.
[0103] With this configuration, the magnetic flux of the first primary sub-coil 212A is coupled with the magnetic flux of the first primary coil 211, and the magnetic flux of the second primary sub-coil 212B is coupled with the magnetic flux of the third primary coil 213. Therefore, the magnetic coupling is optimized, and the size and mass of the primary body 230 and the secondary body 240 can be reduced.
[0104] like Figure 3 As shown, the winding direction of the first primary sub-coil 212A is the same as that of the first primary coil 211, and opposite to the winding direction of the second primary sub-coil 212B and the third primary coil 213.
[0105] In the same way, such as Figure 3 As shown, the winding direction of the first stage sub-coil 222A is the same as that of the first stage coil 221, and opposite to the winding direction of the second stage sub-coil 222B and the third stage coil 223.
[0106] Since the first primary coil 211, the second primary coil 212, and the third primary coil 213 need to have substantially the same impedance, and the first sub-coil 212A, the second sub-coil 212B, the first coil 211, and the third coil 213 have the same number of turns, they provide the same transformation ratio to each phase. The dimensions of the first primary sub-coil 212A and the second primary sub-coil 212B are configured such that the cross-sectional area of the conductor forming the number of turns of the first primary sub-coil 212A and the second primary sub-coil 212B is twice the cross-sectional area of the conductor forming the number of turns of the first primary coil 211 and the third primary coil 213.
[0107] In a similar manner, the dimensions of the first-stage sub-coil 222A and the second-stage sub-coil 222B are configured such that the cross-sectional area of the conductor forming the number of turns of the first-stage sub-coil 222A and the second-stage sub-coil 222A, 222B is twice the area of the cross-sectional area of the conductor forming the number of turns of the first primary coil 221 and the third primary coil 223.
[0108] like Figure 4 As shown, each of the first housings 231A, 232A, 241A, 242A and the second housings 231B, 232B, 241B, 242B of the first primary groove 231, the second primary groove 232, the first primary groove 241 and the second primary groove 242 has a rectangular semi-axial cross-section and an axial length L forming the axial dimension of the housing. A L B and has a radial height h that forms the radial dimension of the housing. A h B .
[0109] According to the principles of the present invention and in the context of this first embodiment, for the first primary groove 231 and the second primary groove 232, the first housings 231A and 232A have an axial dimension L. A The axial dimension, i.e. the axial length, is greater than the axial dimension, i.e. the axial length, of the second housings 231B and 232B of the first primary groove 231 and the second primary groove 232.
[0110] Similarly, in the context of this first embodiment, for the first stage groove 241 and the second stage groove 242, the first housings 241A, 242A have an axial dimension L. A The axial dimension, i.e. the axial length, is greater than the axial dimension, i.e. the axial length, of the second housings 241B and 242B of the first stage groove 241 and the second stage groove 242.
[0111] Because of this difference in axial dimensions between the first housings 231A, 232A, 241A, 242A and the second housings 231B, 232B, 241B, 242B, and therefore between the sub-coils 212A, 212B, 222A, 222B and coils 211, 213, 221, 223 housed in the first and second housings, the leakage flux of the sub-coils 212A, 212B, 222A, 222B can be reduced relative to the sub-coils 112A, 112B, 122A, 122B disclosed in document WO2013 / 167828, wherein the sub-coils 112A, 112B, 122A, 122B disclosed in document WO 2013 / 167828 are housed in a housing having the same axial dimensions as the corresponding first coil 111 or third coil 113. Therefore, according to the present invention, the leakage flux between the first primary sub-coil 212A and the second primary sub-coil 212B and the first primary coil 211 and the third primary coil 213 can be balanced, and the leakage flux between the first primary sub-coil 222A and the second primary sub-coil 222B and the first primary coil 221 and the third primary coil 223 can be balanced.
[0112] exist Figure 5 This advantage is demonstrated in the text. Figure 5 It is shown in the form of two axial half-sections: respectively for reference to document WO 2013 / 197828. Figure 2 The three-phase rotary transformer 102 shown in the figure, and the first embodiment of the present invention, in Figure 4 The three-phase rotary transformer 202 shown in the figure has magnetic flux lines 301, 302, 303, and 304 calculated by the inventor based on finite element analysis. Figure 5 The top shows the magnetic flux of the three-phase rotary transformer 102, with the main magnetic flux marked as 301, the leakage magnetic flux marked as 302, and in Figure 5 The bottom shows the magnetic flux of the three-phase rotary transformer 202, with the main magnetic flux marked as 303 and the leakage magnetic flux marked as 304.
[0113] therefore, Figure 5 The variation in leakage flux between the prior art construction shown at the top (corresponding to the construction in document WO2013 / 197828) and the construction of the present invention shown at the bottom can be illustrated.
[0114] It can be noted that, in the context of existing technology, the leakage flux lines 302 from coils 111A and 121A are primarily related to the leakage flux lines 301 from coils 112 and 122, respectively. In the construction of this invention, it should be noted that the leakage flux lines 303 from coils 211A and 221A are reduced relative to coils 212 and 222. For Figure 4 The dimensions of the first and second shells in the structure shown, and the axial dimension L of the first shells 231A and 241A. A and radial dimension h A And the axial dimension L of the second housing 231B, 241B B and radial dimension h B It conforms to the following equation:
[0115] (1)L A ×h A =2L B ×h B
[0116] (2)L A >L B
[0117] Where L A and h A The axial and radial dimensions, L, of the first housings 231A, 232A, 241A, and 242A of slots 231, 232, 241, and 242. B and h B These are the axial and radial dimensions of the second housings 231B, 232B, 241B, and 242B in the same slots 231, 232, 241, and 242.
[0118] It should be noted that, according to one possibility of the invention, the above equations can be satisfied by defining a term called the magnetic flux balance factor r, where r is strictly greater than 1, and the first housings 231A, 232A, 241A, 242A of each slot 231, 232, 241, 242 satisfy the following conditions:
[0119] -Axial dimension L A The value equals r2 multiplied by the axial dimension L of the second housings 231B, 232B, 241B, 242 of the grooves 231, 232, 241, 242. B ,as well as
[0120] -Radial dimension h A The value equals 2 / r² multiplied by the radial dimension h of the second housings 231B, 232B, 241B, 242B of the slots 231, 232, 241, 242. B .
[0121] To illustrate the advantages of this dimensional design of the housings 231A, 231B, 232A, 232B, 241A, 241B, 242A, 242B, and thus the advantages of this dimensional design of the sub-coils 212A, 212B, 222A, 222B and coils 211, 213, 221, 223 housed within the housings, the inventors simulated the variation of the current values 311, 312, 313 passing through each primary phase of the transformer according to the invention based on the flux balance factor. Therefore, curve 311 corresponds to the primary phase associated with the first primary coil 211, and curves 312 and 313 correspond to the primary phases associated with the second primary coil 212 and the third primary coil 213, respectively.
[0122] exist Figure 6 In the graph shown, the flux balance factor value starts from 5 to achieve a good balance between phases at 7.5. It can be seen that for the minimum value of the flux balance factor r, i.e., the minimum value of r equals 5, the current of the primary phase associated with the first primary coil 211 is 25.6A, while the currents of the primary phases associated with the second primary coil 212 and the third primary coil 213 are 25.2A and 25.15A, respectively. It should be noted that for the flux balance coefficient, the current of each primary phase is essentially the same, equal to 24.58A.
[0123] Therefore, in this example, with a flux balance factor of 7.5, a good balance of currents can be achieved between the primary phases of the three-phase rotary transformer 202 according to the invention, and thus a good balance of currents between the secondary phases of the three-phase rotary transformer 202 according to the invention. Of course, according to the principles of the invention, this balance factor can vary depending on the desired balance conditions and the construction of the transformer and its coils 211, 212, 213, 221, 222, 223. Figure 7 A three-phase rotary transformer 202 according to a second embodiment is shown, wherein each of the primary slots 231, 232 and the secondary slots 241, 242 has a constant axial length over the entire radial height, and the housings 231B, 232B, 241B, 242B of these slots 231, 232, 241, 242 corresponding to the first primary coil 211, the third primary coil 213, the first secondary coil 221 and the third secondary coil 223 are defined by walls 233 made of ferromagnetic material.
[0124] Therefore, the difference between the three-phase rotary transformer 202 according to the second embodiment and the three-phase rotary transformer 202 according to the first embodiment lies in the shape of the primary slots 231, 232 and the secondary slots 241, 242. This is due to the fact that the primary and secondary slots of the three-phase rotary transformer according to the second embodiment include walls 233 that define their second housings 231B, 232B, 241B, 242B, respectively.
[0125] The first housings 231A, 232A, 241A, 242A and the second housings 231B, 232B, 241B, 242B of the first primary groove 231, the second primary groove 232, the first secondary groove 241 and the second secondary groove 242 are housed in the cavities of the corresponding primary grooves 231, 232 or secondary grooves 241, 242.
[0126] The cavity of each of the first primary groove 231, the second primary groove 232, the first stage groove 241, and the second stage groove 242 has an axial dimension L. A This axial dimension, or axial length, is equal to the axial dimension L of the first housings 231A, 232A, 241A, 242A of the primary grooves 231, 232 or the secondary grooves 241, 242. A That is, the axial length. Therefore, each of the primary grooves 231, 232 and the secondary grooves 241, 242 also includes a wall 233 made of ferromagnetic material to axially define the second housing 231B, 232B, 241B, 242B.
[0127] Figure 8 A three-phase rotary transformer 202 according to a third embodiment is shown, wherein the primary body 230 and the secondary body 240 each include a central portion 234, 244, the central portions 234, 244 being sized to fully accommodate the second housings 231B, 232B, 241B, 242B of the corresponding first slots 231, 232 and second slots 241, 242, and partially accommodate the first housings 231A, 232A, 241A, 242A of the slots 231, 232, 241, 242, respectively. Two axial shoulders 235, 245 extend radially on opposite sides of the central bodies 234, 244, the two axial shoulders being sized to accommodate the remaining housing portions of the first housings 231A, 232A, 241A, 242A that are not accommodated in the central portions 234, 244.
[0128] The difference between the three-phase rotary transformer 202 according to the third embodiment and the three-phase rotary transformer 202 according to the first embodiment is that the primary body 230 and the secondary body 240 each have a central portion 234, 244 and two axial shoulders 235, 245.
[0129] Therefore, according to this third embodiment, the primary body 230 has:
[0130] - A central portion 234, the axial dimensions of which are configured to fully accommodate the second housings 231B, 232B of the first primary groove 231 and the second primary groove 232, the first housings 231A, 232A of the first primary groove 231 and the second primary groove 232 being partially accommodated in the central portion 234;
[0131] - A first axial shoulder and a second axial shoulder 235 extend axially on opposite sides of the central portion 234, respectively. The dimensions of the first axial shoulder and the second axial shoulder are configured to accommodate the corresponding portions of the first housings 231A and 232A that are not accommodated in the central portion 234.
[0132] In the same manner, the secondary body 240 has:
[0133] - A central portion 244, the axial dimensions of which are configured to fully accommodate the second housings 241B, 242B of the first stage groove 241 and the second stage groove 242, the first housings 241A, 242A of the first stage groove 241 and the second stage groove 242 being partially accommodated in the central portion 244;
[0134] - A first axial shoulder and a second axial shoulder 245 extend axially on opposite sides of the central portion 244, respectively. The dimensions of the first axial shoulder and the second axial shoulder are configured to accommodate the corresponding portions of the first housings 241A and 242A that are not accommodated in the central portion 244.
[0135] Of course, if in each of the above embodiments, the first housings 231A, 232A, 241A, 242A of each slot 231, 232, 241, 242 are housings that accommodate the sub-coils 212A, 212B, 222A, 222B of the corresponding second coils 212, 222, and the second housings 231B, 232B, 241B, 242B are housings that accommodate the corresponding coils 211, 213, 221, 223, then in the context of the present invention, it is also conceivable to interchange the roles of the first housings 231A, 232A, 241A, 242A and the second housings 231B, 232B, 241B, 242B. Therefore, based on this possibility, for each slot 231, 232, 241, 242, the first housings 231A, 232A, 241A, 242A accommodate the coils of the corresponding first coils 211, 221 and the third coils 213, 223, and the second housings 231B, 232B, 241B, 242B accommodate the sub-coils 212A, 212B, 222A, 222B of the corresponding second coils 212, 222.
[0136] According to a possible application of the invention, the rotating machine 201 may be a turbine, with a first primary coil, a second primary coil, and a third primary coil respectively connected to the first, second, and third phases of a three-phase circuit for powering the turbine, the three-phase circuit including an alternator of the turbine, and the first, second, and third primary coils respectively connected to the first, second, and third phases of a load circuit of the turbine, such as a de-icing circuit for the blades, the blades being, for example, blades at the turbine's air inlet.
Claims
1. A three-phase rotary transformer (202), comprising: -At least the first primary coil, the second primary coil, and the third primary coil (211, 212, 213); - The first primary coil, the second primary coil, and the third primary coil (221, 222, 223) correspond to the first primary coil, the second primary coil, and the third primary coil (211, 212, 213), respectively. - A primary body (230), made of ferromagnetic material and formed as a solid rotating about a rotation axis (203); and - A secondary body (240), made of ferromagnetic material and forming a rotating entity, the secondary body (240) being concentric with the primary body (230) such that one of the primary body (230) and the secondary body (240) rotates about the other of the primary body (230) and the secondary body (240) by rotating about the rotation axis (203). The second primary coil (212) includes at least a first primary sub-coil and a second primary sub-coil (212A, 212B), and the second primary coil (222) includes at least a first primary sub-coil and a second primary sub-coil (222A, 222B). The primary body (230) includes a first primary groove (231) and a second primary groove (232), each of the first and second primary grooves having an opening facing the secondary body (240), and the secondary body (240) includes a first primary groove (241) and a second primary groove (242), each of the first and second primary grooves having an opening facing the first primary groove (231) and the second primary groove (232), respectively. Each of the first primary groove and the second primary groove (231, 232) includes annular first primary housings (231A, 232A) and second primary housings (231B, 232B) arranged radially continuously from the openings of the first primary groove and the second primary groove (231, 232). Each of the first-stage groove and the second-stage groove (241, 242) includes annular first-stage housings (241A, 242A) and second-stage housings (241B, 242B) arranged radially continuously from the openings of the first-stage groove and the second-stage groove (241, 242). The first primary slot (231) accommodates the first primary sub-coil (212A) and the first primary coil (211). The first primary sub-coil (212A) is arranged within one of the first primary housing and the second primary housing (231A, 231B) of the first primary slot (231), and the first primary coil (211) is arranged within the other of the first primary housing and the second primary housing (231A, 231B) of the first primary slot (231). The second primary slot (232) accommodates the second primary sub-coil (212B) and the third primary coil (213). The second primary sub-coil (212B) is arranged within one of the first primary housing and the second primary housing (232A, 232B) of the second primary slot (232), and the third primary coil (213) is arranged within the other of the first primary housing and the second primary housing (232A, 232B) of the second primary slot (232). The first-stage slot (241) accommodates the first-stage sub-coil (222A) and the first-stage coil (221). The first-stage sub-coil (222A) is arranged within one of the first-stage housing and the second-stage housing (241A, 241B) of the first-stage slot (241), and the first-stage coil (221) is arranged within the other of the first-stage housing and the second-stage housing (241A, 241B) of the first-stage slot (241). The second-stage slot (242) accommodates the second-stage sub-coil (222B) and the third-stage coil (223). The second-stage sub-coil (222B) is arranged within one of the first-stage housing and the second-stage housing (242A, 242B) of the second-stage slot (242), and the third-stage coil (223) is arranged within the other of the first-stage housing and the second-stage housing (242A, 242B) of the second-stage slot (242). Wherein, for the first primary slot (231) and the second primary slot (232), the axial dimension (L) of one of the first primary housing and the second primary housing (231A, 231B, 232A, 232B) accommodating the first primary sub-coil and the second primary sub-coil (212A, 212B) is... A The axial dimension (L) is greater than that of the other of the first primary housing and the second primary housing (231A, 231B, 232A, 232B). B ),as well as Wherein, for the first stage slot (241) and the second stage slot (242), the axial dimension (L) of one of the first stage housing and the second stage housing (241A, 241B, 242A, 242B) accommodating the first stage sub-coil and the second stage sub-coil (222A, 222B) is... A The axial dimension (L) is greater than that of the other of the first-stage housing and the second-stage housing (241A, 241B, 242A, 242B). B ).
2. The three-phase rotary transformer (202) according to claim 1, wherein, Each of the first primary sub-coil and the second primary sub-coil (212A, 212B) is housed in a corresponding first primary housing (231A, 232A) of the first primary slot and the second primary slot (231, 232). Each of the first-stage sub-coil and the second-stage sub-coil (222A, 222B) is housed in a corresponding first-stage housing (241A, 242A) of the first-stage slot and the second-stage slot (241, 242).
3. The three-phase rotary transformer (202) according to claim 2, wherein, Each of the first primary groove (231), the second primary groove (232), the first stage groove (241), and the second stage groove (242) has an axial dimension (L). A L B ), Wherein, in each of the first primary slot and the second primary slot (231, 232), one of the first primary housing and the second primary housing (231A, 231B, 232A, 232B) accommodating the first primary sub-coil and the second primary sub-coil (212A, 212B) of the second primary coil has: -Axial dimension (L) A The axial dimension is equal to r. 2 Multiply by the axial dimension (L) of the other of the first primary housing and the second primary housing (231A, 231B, 232A, 232B). B );and -Radial dimension (h) A The radial dimension is equal to 2 / r. 2 Multiplied by the radial dimension (h) of the other of the first primary housing and the second primary housing (231A, 231B, 232A, 232B). B ), r is called the balance factor of magnetic flux.
4. The three-phase rotary transformer according to claim 3, wherein, Determine the balance factor of the magnetic flux to balance the current between the first primary coil, the second primary coil, and the third primary coil (211, 212, 213) and to balance the current between the first primary coil, the second primary coil, and the third primary coil (221, 222, 223).
5. The three-phase rotary transformer (202) according to any one of claims 1 to 4, wherein, The first primary housing and the second primary housing (231A, 231B, 232A, 232B) of the first primary groove and the second primary groove (231, 232) are accommodated in the cavities of the first primary groove and the second primary groove (231, 232). The cavity in each of the first and second primary grooves (231, 232) has an axial dimension (L). A The axial dimension of the cavity of the first primary slot and the second primary slot is equal to the axial dimension (L) of one of the first primary housing and the second primary housing (231A, 231B, 232A, 232B) that accommodates the first primary sub-coil and the second primary sub-coil (212A, 212B). A The cavities of the first and second primary grooves include walls (233) made of ferromagnetic material to axially define another of the first and second primary housings (231A, 231B, 232A, 232B). The first-stage housing (241A, 241B, 242A, 242B) of the first-stage groove and the second-stage groove (241, 242) are accommodated in the cavities of the first-stage groove and the second-stage groove (241, 242). The cavity of each of the first-stage slots and the second-stage slots (241, 242) has an axial dimension equal to the axial dimension of one of the first-stage housings and the second-stage housings (241A, 241B, 242A, 242B) that accommodate the first-stage sub-coils and the second-stage sub-coils (222A, 222B), and the cavity of the first-stage slots and the second-stage slots includes a wall made of ferromagnetic material to axially define the other of the first-stage housings and the second-stage housings (241A, 241B, 242A, 242B).
6. The three-phase rotary transformer (202) according to any one of claims 1 to 4, wherein, In a half-view of the axial cross-section, the primary body (230) has: - Central portion (234), the axial dimension of the central portion of the primary body is configured to fully accommodate the first primary slot and the second primary slot (231, 232) and not accommodate the first primary sub-coil and the second primary sub-coil (212A, 212B), the first primary housing (231A, 232A) accommodating the first primary slot and the second primary slot (231, 232) and accommodating the first primary sub-coil and the second primary sub-coil (212A, 212B) is partially accommodated in the central portion (234) of the primary body; - A first axial shoulder and a second axial shoulder (235) extend axially on opposite sides of the central portion (234) of the primary body, respectively. The dimensions of the first axial shoulder and the second axial shoulder of the primary body are configured to accommodate the portion of each first primary housing (231A, 232A) of the first primary groove and the second primary groove (231, 232) that is not accommodated in the central portion (234) of the primary body. Furthermore, in a half-view of the axial cross-section, the secondary body (240) has: - Central portion (244), the axial dimension of the central portion of the secondary body is configured to fully accommodate the first stage slots and the second stage slots (241, 242) and not accommodate the first stage sub-coils and the second stage sub-coils (222A, 222B), the first stage housing (241B, 234B) of the first stage slots and the second stage slots (241, 242) and the first stage housing (241A, 242A) of the first stage slots and the second stage slots (241, 242) that accommodate the first stage sub-coils and the second stage sub-coils (222A, 222B) are partially accommodated in the central portion (244) of the secondary body; - A first axial shoulder and a second axial shoulder (245) extend axially on opposite sides of the central portion (244) of the secondary body, respectively, the first axial shoulder and the second axial shoulder of the secondary body being sized to accommodate the portion of each first stage housing (241A, 242A) of the first stage groove and the second stage groove (241, 242) that is not accommodated in the central portion (244) of the secondary body.
7. A rotating machine (201), comprising a three-phase rotary transformer according to any one of claims 1 to 6, wherein, The three-phase rotary transformer includes a stator and a rotor, the primary body (230) is included in one of the stator and the rotor, and the secondary body is included in the other of the stator and the rotor.
8. The rotating machine (201) according to claim 7, wherein the rotating machine is a turbine.
9. The rotating machine (201) according to claim 8, wherein, The primary body (230) is included in the stator, and the secondary body (240) is included in the rotor. Furthermore, the first-stage coil, the second-stage coil, and the third-stage coil (221, 222, 223) provide de-icing circuits for the turbine blades.
Citation Information
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