Rotor winding of wound brushless doubly-fed motor

Abstract

The invention relates to the technical field of motors, and particularly discloses a rotor winding of a winding type brushless doubly-fed motor, which comprises a first set of winding with the pole pair number of P1 and a second set of winding with the pole pair number of P2, and the first set of winding and the second set of winding are single-layer windings; wherein, P1lt; when P2 is greater than P2, the coil pitch of the first set of windings is greater than the coil pitch of the second set of windings. The two sets of windings are designed according to the tooth harmonic principle, then magnetomotive force harmonic analysis is conducted on the whole two sets of windings, and the rotor winding with the high conductor utilization rate and the low harmonic content of the whole winding can be obtained; the whole rotor winding adopts irregular single-turn coil double-layer arrangement, so that the winding structure is simplified, the utilization rate of a winding conductor is improved, the defects of an original winding type rotor are overcome, the harmonic content is smaller, the power density is improved, and the operation is reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly, to a rotor winding of a wound brushless doubly-fed motor. Background Art

[0002] The brushless doubly-fed motor is powered by the grid power supply and the variable-frequency power supply respectively, and has the characteristics of reliable operation, a relatively small capacity of the required variable-frequency power supply, and the ability to adopt different voltage levels. This motor can operate in the motor variable-frequency speed regulation mode and is also suitable as a generator, and is applied to fields such as wind or water variable-speed constant-frequency power generation.

[0003] The stator winding of the brushless doubly-fed motor has two pole pairs of P1 and P2 at the same time, and it is also required that the rotor winding can generate magnetomotive force waves with pole pairs of P1 and P2 and opposite rotation directions at the same time, and has as high a winding coefficient as possible for the two pole pairs of P1 and P2. The key to the good performance of the brushless doubly-fed motor lies in the rotor, and the rotor types include wound type and reluctance type.

[0004] The reluctance rotor core is made into a structure similar to salient poles, and there are no conductors on it.

[0005] The slots of the wound rotor are arranged with multi-phase windings. In principle, it can be composed of two sets of multi-phase windings with pole pairs of P1 and P2 in series. The ratio of the pole pairs of P1 and P2 can be selected according to the actual situation. However, in the wound rotors put into practical engineering applications, the ratio of the pole pairs of P1 and P2 is mostly 1:3. However, for the current wound rotor winding with a pole ratio of 1:3, since the coil conductors of the wound rotor winding need to be isolated from the iron core by insulating materials, the manufacturing process is complex, and there are also many problems such as low power density.

[0006] Therefore, it is necessary to propose a rotor winding of a wound brushless doubly-fed motor to at least partially solve the problems existing in the prior art. Summary of the Invention

[0007] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description section. The Summary of the Invention section of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0008] To at least partially solve the above problems, the present invention provides a rotor winding of a wound brushless doubly-fed motor, including: a first set of windings with a pole pair of P1 and a second set of windings with a pole pair of P2, and the first set of windings and the second set of windings are single-layer windings; wherein, when P1 < P2, the coil pitch of the first set of windings is greater than the coil pitch of the second set of windings.

[0009] Preferably, the first set of windings and the second set of windings each have m parallel branches;

[0010] The i-th branch of the first set of windings is connected in series with the i-th branch of the second set of windings;

[0011] Among them, m=P1+P2, i=1,2,…,m.

[0012] Preferably, each branch of the first set of windings has 8 coils A, and the coil pitch of the coils A is 40; each branch of the second set of windings has 8 coils B, and the coil pitch of the coils B is 16.

[0013] Preferably, a coil C is connected in series on the i-th branch of the first set of windings, and the coil pitch of the coil C is 34; a coil D is connected in series on the i-th branch of the second set of windings, and the coil pitch of the coil D is 17.

[0014] Preferably, the number of pole pairs P1=1, P2=3, the number of slots on the rotor is 96, and each slot has a corresponding slot number.

[0015] Preferably, the m parallel branches of the first set of windings include:

[0016] The first branch A1 has 8 coils A on it, and the corresponding slot numbers are 8, 9, 10, 11, 12, 13, 14, and 15;

[0017] The second branch B1, the 8 coils A on it correspond to slot numbers 56, 57, 58, 59, 60, 61, 62, 63;

[0018] The slot numbers corresponding to the eight coils A on the third branch C1 are 32, 33, 34, 35, 36, 37, 38, and 39;

[0019] In the fourth branch D1, the eight coils A thereon correspond to slot numbers 80, 81, 82, 83, 84, 85, 86, and 87.

[0020] Preferably, the m parallel branches of the second set of windings include:

[0021] The first branch A2, the 8 coils B on it correspond to slot numbers 7, 8, 10, 11, 36, 37, 38, 41;

[0022] The second branch B2, the 8 coils B on it correspond to slot numbers 55, 56, 58, 59, 84, 85, 86, 89;

[0023] The slot numbers corresponding to the eight coils B on the third branch C2 are 31, 32, 34, 35, 60, 61, 62, and 65;

[0024] In the fourth branch D2, the eight coils B thereon correspond to slot numbers 79, 80, 82, 83, 12, 13, 14, and 17.

[0025] Preferably, the slot numbers corresponding to the coils C connected in series on the first branch A1, the second branch B1, the third branch C1 and the fourth branch D1 are 15, 63, 39 and 87;

[0026] The slot numbers corresponding to the coils D connected in series on the first branch A2, the second branch B2, the third branch C2 and the fourth branch D2 are 71, 23, 95 and 47 respectively.

[0027] Preferably, the coil arrangement of each branch of the first set of windings and each branch of the second set of windings satisfies the following condition: the number of conductors in each slot on the rotor where the coils are arranged is the same; wherein the conductors are effective sides of the coils.

[0028] Preferably, the coil pitches of the first set of windings and the second set of windings satisfy the following design conditions: the maximum value of the relative amplitude of the winding magnetomotive force harmonics is less than or equal to the set relative amplitude, the winding coefficient of the first set of windings is greater than or equal to the first set value, the winding coefficient of the second set of windings is greater than or equal to the second set value, and the utilization rate of the conductor is maximized.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The rotor winding of the wound-type brushless doubly-fed motor described in the present invention uses the tooth harmonic principle to design two sets of windings separately, and then performs magnetomotive force harmonic analysis on the two sets of windings as a whole, so as to obtain a rotor winding with high conductor utilization and low harmonic content of the overall winding; the rotor winding as a whole adopts an irregular single-turn coil double-layer arrangement, which simplifies the winding structure, improves the winding conductor utilization, overcomes the defects of the original winding rotor, has a smaller harmonic content, improves the power density, and is reliable in operation.

[0031] The rotor winding of the wound-rotor brushless double-fed motor described in the present invention, other advantages, objectives and features of the present invention will be partially reflected through the following description, and will also be partially understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of a first solution of the rotor winding of the wound-rotor brushless double-fed motor according to the present invention;

[0034] Figure 2 This is the second schematic diagram of the rotor winding of the wound brushless doubly-fed motor according to the present invention. Specific embodiments

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0036] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0037] As Figure 1-Figure 2 shown, the present invention provides a rotor winding of a wound brushless doubly-fed motor, including: a first set of windings with a pole pair number of P1 and a second set of windings with a pole pair number of P2, and the first set of windings and the second set of windings are single-layer windings; wherein, when P1 < P2, the coil pitch of the first set of windings is greater than the coil pitch of the second set of windings.

[0038] The coil pitches and the coil distributions of the first set of windings and the second set of windings are designed based on the tooth harmonic principle, and the first set of windings and the second set of windings are designed separately, that is, different coil pitches are taken respectively according to the magnitudes of the pole pair numbers of the first set of windings and the second set of windings, and then the first set of windings and the second set of windings are connected in series, and the magnetomotive force harmonic content is analyzed. By changing the coil pitches and the coil distributions of the first set of windings and the second set of windings respectively, a rotor winding composition scheme with high conductor utilization rate and low harmonic content of the overall winding is selected.

[0039] Through the above design, the two sets of windings are designed separately using the tooth harmonic principle, and then the magnetomotive force harmonic analysis is carried out on the overall two sets of windings, and a rotor winding with high conductor utilization rate and low harmonic content of the overall winding can be obtained; the overall rotor winding adopts an irregular single-turn coil double-layer arrangement, which simplifies the winding structure, improves the conductor utilization rate of the winding, overcomes the defects of the original wound rotor, has smaller harmonic content, higher power density, and reliable operation.

[0040] In one embodiment, the first set of windings and the second set of windings each have m parallel branches;

[0041] The i-th branch of the first set of windings is connected in series with the i-th branch of the second set of windings;

[0042] wherein, m = P1 + P2, and i = 1, 2,..., m.

[0043] The number of branches of the first set of windings and the second set of windings is the sum of the numbers of the pole pairs P1 and P2. For example, if P1 = 1 and P2 = 3, then the equivalent pole pair number of the rotor is Pr =P1+P2=4, then the rotor winding has a total of 4 parallel branches, the i-th branch of the first set of windings and the i-th branch of the second set of windings are connected in series to form the i-th branch of the rotor winding.

[0044] In one embodiment, the coil arrangement of each branch of the first set of windings and each branch of the second set of windings meets the following conditions: the number of conductors in each slot on the rotor where the coils are arranged is the same; wherein the conductors are effective sides of the coils.

[0045] Among them, the number of conductors in each slot where the coil is arranged on the rotor is 2, the first set of windings and the second set of windings are both single-turn coils, and the two sets of windings are arranged on the rotor. It is necessary to ensure that there are two effective sides of the coil in each slot, that is, the rotor winding is a double-layer winding as a whole.

[0046] In one embodiment, in order to ensure the overall performance of the rotor winding, when designing the first set of windings and the second set of windings, the coil pitches of the first set of windings and the second set of windings satisfy the following design conditions: the maximum value of the relative amplitude of the harmonics of the winding magnetomotive force is less than or equal to the set relative amplitude, the winding coefficient of the first set of windings is greater than or equal to the first set value, the winding coefficient of the second set of windings is greater than or equal to the second set value, and the utilization rate of the conductor is maximized.

[0047] Furthermore, the value range of the set relative amplitude is 4.1% to 4.5%, the value range of the first set value is 0.5 to 0.55, and the value range of the second set value is 0.7 to 0.75.

[0048] By limiting the above design conditions, the utilization rate of the entire winding conductor can be improved, the magnetomotive force harmonic content can be reduced, the overall performance of the winding can be improved, the power density can be increased, and the winding structure can be simplified.

[0049] In one embodiment, each branch of the first winding has 8 coils A, and the coil pitch of the coils A is 40; each branch of the second winding has 8 coils B, and the coil pitch of the coils B is 16.

[0050] The arrangement of wound rotor windings must first select the number of rotor slots. The selection of the number of rotor slots is related to factors such as the motor capacity. Each slot of the rotor has a corresponding slot number.

[0051] The first set of windings and the second set of windings are designed respectively according to the winding tooth harmonic principle, and the slot numbers contained in the m parallel branches of the first set of windings and the second set of windings are determined respectively, and the slot number represents a coil.

[0052] Furthermore, the number of pole pairs P1=1, P2=3, the number of slots on the rotor is 96, and each slot has a corresponding slot number.

[0053] Then the first set of windings and the second set of windings each have 4 parallel branches;

[0054] like Figure 1 As shown, for the first set of windings with P1=1, the design is carried out according to the winding tooth harmonic principle to determine the slot numbers contained in each of the four parallel branches, namely:

[0055] The m parallel branches of the first set of windings include:

[0056] The first branch A1 has 8 coils A on it, and the corresponding slot numbers are 8, 9, 10, 11, 12, 13, 14, and 15;

[0057] The second branch B1, the 8 coils A on it correspond to slot numbers 56, 57, 58, 59, 60, 61, 62, 63;

[0058] The slot numbers corresponding to the eight coils A on the third branch C1 are 32, 33, 34, 35, 36, 37, 38, and 39;

[0059] The slot numbers corresponding to the eight coils A on the fourth branch D1 are 80, 81, 82, 83, 84, 85, 86, and 87;

[0060] The coil pitch y of the plurality of coils A is A =40, the number of slot numbers listed above is less than 96. This is because according to the harmonic analysis results, in order to improve the utilization rate of the winding conductor, the winding phase band width is restricted, so there will inevitably be some empty slots on the rotor.

[0061] like Figure 1 As shown, for the second set of windings with P2=3, the design is carried out according to the winding tooth harmonic principle to determine the slot numbers contained in each of the four parallel branches, namely:

[0062] The m parallel branches of the second set of windings include:

[0063] The first branch A2, the 8 coils B on it correspond to slot numbers 7, 8, 10, 11, 36, 37, 38, 41;

[0064] The second branch B2, the 8 coils B on it correspond to slot numbers 55, 56, 58, 59, 84, 85, 86, 89;

[0065] The slot numbers corresponding to the eight coils B on the third branch C2 are 31, 32, 34, 35, 60, 61, 62, and 65;

[0066] The slot numbers corresponding to the eight coils B on the fourth branch D2 are 79, 80, 82, 83, 12, 13, 14, and 17;

[0067] The coil pitch y of the plurality of coils B is B =16. Compared with the first set of windings with P1=1, in addition to the different coil pitches, the slot numbers of each branch of the second set of windings are not continuous, but show an irregular distribution. This is because according to harmonic analysis, in order to maximize the utilization rate of the winding conductors, the result is obtained while ensuring that the number of conductors in each slot is the same.

[0068] The first set of windings and the second set of windings are both single-layer windings. At this time, the rotor winding is a double-layer winding as a whole, but there are still some empty slots on the rotor.

[0069] In order to improve the utilization rate of empty slots and the overall performance of the rotor winding, on the premise of ensuring that the effective side of the coil in the slot is double-layered, coils in series are added to each branch of the first set of windings and each branch of the second set of windings. The following two solutions are provided:

[0070] like Figure 1 As shown, in the first type, a coil C is connected in series on the i-th branch of the first set of windings, and the coil pitch of the coil C is 34; a coil D is connected in series on the i-th branch of the second set of windings, and the coil pitch of the coil D is 17.

[0071] Furthermore, the slot numbers corresponding to the coils C connected in series on the first branch A1, the second branch B1, the third branch C1 and the fourth branch D1 are 15, 63, 39 and 87 respectively.

[0072] The coil pitch y corresponding to the above multiple coils C C =34.

[0073] Furthermore, the slot numbers corresponding to the coils D connected in series on the first branch A2, the second branch B2, the third branch C2 and the fourth branch D2 are 71, 23, 95 and 47 respectively.

[0074] The coil pitch y corresponding to the above multiple coils D D =17.

[0075] Coil C and coil D are connected in series on each branch according to the corresponding slot number to form a closed loop.

[0076] The overall wiring diagram of the rotor winding is as follows: Figure 1 As shown, the coil pitch y of the slot number in the dotted box in the figure B =16, the coil pitch y of the slot number in the dotted line frame A =40, the coil pitch y of the slot number in the double dashed box D =17, the coil pitch y of the slot number in the double-dotted frame C=34; analyzing the rotor winding, it can be seen that for P1=1, the winding coefficient is 0.5736, for P2=3, the winding coefficient is 0.7503, and the maximum value of the relative amplitude of the winding magnetomotive force harmonic does not exceed 4.02% (relative to P2=3).

[0077] Designing coils C and D based on the arrangement of coils A and B can improve the utilization of rotor slots and enhance overall performance.

[0078] like Figure 2 As shown, in the second type, a coil D and a coil E are connected in series between the i-th branch of the first set of windings and the i-th branch of the second set of windings, the coil pitch of the coil D is 17, and the coil pitch of the coil E is 19; a coil C is connected in series on the i-th branch of the second set of windings, and the coil pitch of the coil C is 34.

[0079] Furthermore, the slot numbers corresponding to the coil D respectively connected in series between the first branch A1 and the second branch A2, between the second branch B1 and the second branch B2, between the third branch C1 and the third branch C2, and between the fourth branch D1 and the fourth branch D2 are 23, 71, 47, and 95, and the slot numbers corresponding to the coil E are 22, 70, 46, and 94;

[0080] The coil pitch y corresponding to the above multiple coils D D =17, the coil pitch y corresponding to the multiple coils E E =19.

[0081] Furthermore, the slot numbers corresponding to the coils C connected in series on the first branch A2, the second branch B2, the third branch C2 and the fourth branch D2 are 15, 63, 39 and 87 respectively;

[0082] The coil pitch y corresponding to the above multiple coils C C =34.

[0083] Coil C, coil D, and coil E are connected in series on each branch according to the corresponding slot numbers to form a closed loop.

[0084] The above design needs to keep the effective side of the coil in the slot as double layers. The above scheme further improves the utilization rate of the empty slots on the rotor. The overall connection diagram of the rotor winding is as follows: Figure 2As shown; at this time, for P1=1, the winding coefficient is 0.5127, which is lower than the winding coefficient corresponding to P1=1 in the first solution; for P2=3, the winding coefficient is 0.7611, which is higher than the winding coefficient corresponding to P2=3 in the first solution, and the maximum relative amplitude of the winding magnetomotive force harmonic is 4.45% (relative to P2=3); it can be seen that when the winding coefficient and the winding magnetomotive force harmonic meet the design conditions, more coils can be placed in the slots of the rotor to reduce empty slots.

[0085] In one embodiment, when designing the coil pitches of the first set of windings and the second set of windings, analysis and adjustment are performed based on the current coil pitch, including:

[0086] S1. Acquire the current coil pitch of the first set of windings and the second set of windings to obtain the current coil pitch of the first set of windings and the second set of windings;

[0087] S2, determining the number of pole pairs of the first set of windings and the second set of windings, and obtaining basic information about the number of slots of the first set of windings and the second set of windings, wherein the basic information about the number of slots includes: the number of branch slots, the total number of slots of the set, and the total number of slots of the whole;

[0088] S3, acquiring winding magnetomotive force harmonics based on basic information of current coil pitch, pole pair number and slot number of the first set of windings and the second set of windings;

[0089] S4, performing amplitude analysis on the winding magnetomotive force harmonics, calculating the relative amplitude of the winding magnetomotive force harmonics, and determining the maximum value of the relative amplitude of the winding magnetomotive force harmonics;

[0090] S5, calculating the winding coefficient according to the basic information of the current coil pitch, pole pair number and slot number of the first set of windings and the second set of windings, to obtain the winding coefficient of the first set of windings and the winding coefficient of the second set of windings;

[0091] S6. Analyze and judge the maximum value of the relative amplitude of the harmonics of the magnetomotive force of the winding, the winding coefficient of the first set of windings, and the winding coefficient of the second set of windings in combination with the set relative amplitude, the first set value, and the second set value, respectively, to determine whether the maximum value of the relative amplitude of the harmonics of the magnetomotive force of the winding is less than or equal to the set relative amplitude, whether the winding coefficient of the first set of windings is greater than or equal to the first set value, and whether the winding coefficient of the second set of windings is greater than or equal to the second set value, and obtain a first analysis and judgment result, a second analysis result, and a third analysis and judgment result;

[0092] S7. When the first analysis and judgment result is that the maximum value of the relative amplitude of the harmonics of the winding magnetomotive force is less than or equal to the set relative amplitude, and the second analysis result is that the winding coefficient of the first set of windings is greater than or equal to the first set value, the current coil pitch of the first set of windings is the target coil pitch of the first set of windings. Otherwise, the current coil pitch of the first set of windings is adjusted and updated, and S3-S6 are repeated based on the adjusted and updated coil pitch, until the first analysis and judgment result is that the maximum value of the relative amplitude of the harmonics of the winding magnetomotive force is less than or equal to the set relative amplitude, and the second analysis result is that the winding coefficient of the first set of windings is greater than or equal to the first set value, the latest adjusted and updated coil pitch is used as the target coil pitch of the first set of windings. ; When the first analysis and judgment result is that the maximum value of the relative amplitude of the winding magnetomotive force harmonics is less than or equal to the set relative amplitude, and the third analysis and judgment result is that the winding coefficient of the second set of windings is greater than or equal to the second set value, the current coil pitch of the second set of windings is the target coil pitch of the second set of windings, otherwise the current coil pitch of the second set of windings is adjusted and updated, and S3-S6 are repeated based on the adjusted and updated coil pitch, until the first analysis and judgment result is that the maximum value of the relative amplitude of the winding magnetomotive force harmonics is less than or equal to the set relative amplitude, and the third analysis result is that the winding coefficient of the second set of windings is greater than or equal to the second set value, the latest adjusted and updated coil pitch is used as the target coil pitch of the second set of windings.

[0093] Further, when the winding coefficient is calculated according to the basic information of the current coil pitch, pole pair number and slot number of the first set of windings and the second set of windings, the winding coefficients of the first set of windings and the second set of windings are obtained by the following formula:

[0094]

[0095] In the above formula, K i Indicates the winding coefficient. When i=1, it indicates the winding coefficient of the first set of windings. When i=2, it indicates the winding coefficient of the second set of windings. i Indicates the coil pitch. When i=1, it indicates the coil pitch of the first set of windings. When i=2, it indicates the coil pitch of the second set of windings. n i Indicates the number of slots in the set. When i=1, it indicates the total number of slots in the first set of windings. When i=2, it indicates the total number of slots in the second set of windings. i Indicates the number of slots in the branch. When i=1, it indicates the number of slots in the branch of the first set of windings. When i=2, it indicates the number of slots in the branch of the second set of windings. m i It represents the number of pole pairs. When i=1, it represents the number of pole pairs of the first set of windings. When i=2, it represents the number of pole pairs of the second set of windings. B represents the total number of slots.

[0096] The idealized design of the coil pitch is realized, so that the current coil pitch of the first set of windings and the second set of windings is intelligently analyzed and updated, and the target coil pitch of the first set of windings and the second set of windings is quickly determined, thereby reducing the waste of time and improving the efficiency of designing the coil pitch of the first set of windings and the second set of windings, thus providing performance guarantee for the wound-type brushless doubly-fed motor. In addition, by The relationship between the basic information of the current coil pitch, number of pole pairs and number of slots of the first set of windings and the second set of windings and the winding coefficient is fully considered to improve the accuracy of the winding coefficient, thereby reducing the error of the second analysis result and the third analysis and judgment result when analyzing and judging in combination with the first set value and the second set value, providing a guarantee for the adjustment and update of the current coil pitch, so that the target coil pitch of the first set of windings and the second set of windings can be obtained more accurately and quickly, and the coil pitch design of the first set of windings and the second set of windings can be realized.

[0097] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A rotor winding of a wound-type brushless double-fed motor, characterized in that: Including: A first set of windings with a pole pair number of P1 and a second set of windings with a pole pair number of P2, where the first set of windings and the second set of windings are single-layer windings; wherein, when P1 < P2, the coil pitch of the first set of windings is greater than the coil pitch of the second set of windings.

2. The rotor winding of the wound-rotor brushless double-fed motor according to claim 1, characterized in that: The first set of windings and the second set of windings each have m parallel branches; The i-th branch of the first set of windings is connected in series with the i-th branch of the second set of windings; wherein, m = P1 + P2, and i = 1, 2, …, m.

3. The rotor winding of the wound-rotor brushless double-fed motor according to claim 2, characterized in that: Each branch of the first set of windings has 8 coils A, and the coil pitch of the coil A is 40; each branch of the second set of windings has 8 coils B, and the coil pitch of the coil B is 16.

4. The rotor winding of the wound-rotor brushless double-fed motor according to claim 3, characterized in that: One coil C with a coil pitch of 34 is connected in series on the i-th branch of the first set of windings; one coil D with a coil pitch of 17 is connected in series on the i-th branch of the second set of windings.

5. The rotor winding of the wound-rotor brushless double-fed motor according to claim 4, characterized in that: The pole pair number P1 = 1, P2 = 3, the number of slots on the rotor is 96, and each slot corresponds to a slot number.

6. The rotor winding of the wound-rotor brushless double-fed motor according to claim 5, characterized in that: The m parallel branches of the first set of windings include: The first branch A1, and the slot numbers corresponding to the 8 coils A thereon are 8, 9, 10, 11, 12, 13, 14, 15; The second branch B1, and the slot numbers corresponding to the 8 coils A thereon are 56, 57, 58, 59, 60, 61, 62, 63; The third branch C1, and the slot numbers corresponding to the 8 coils A thereon are 32, 33, 34, 35, 36, 37, 38, 39; The fourth branch D1, and the slot numbers corresponding to the 8 coils A thereon are 80, 81, 82, 83, 84, 85, 86, 87.

7. The rotor winding of the wound-rotor brushless double-fed motor according to claim 6, characterized in that: The m parallel branches of the second set of windings include: The first branch A2, and the slot numbers corresponding to the 8 coils B thereon are 7, 8, 10, 11, 36, 37, 38, 41; The second branch B2, and the slot numbers corresponding to the 8 coils B thereon are 55, 56, 58, 59, 84, 85, 86, 89; The third branch C2, and the slot numbers corresponding to the 8 coils B thereon are 31, 32, 34, 35, 60, 61, 62, 65; The fourth branch D2, and the slot numbers corresponding to the 8 coils B thereon are 79, 80, 82, 83, 12, 13, 14, 17.

8. The rotor winding of the wound-rotor brushless double-fed motor according to claim 7, characterized in that: The slot numbers corresponding to the coils C respectively connected in series on the first branch A1, the second branch B1, the third branch C1, and the fourth branch D1 are 15, 63, 39, 87; The slot numbers corresponding to the coils D respectively connected in series on the first branch A2, the second branch B2, the third branch C2, and the fourth branch D2 are 71, 23, 95, 47.

9. The rotor winding of the wound-rotor brushless double-fed motor according to claim 2, characterized in that: The condition satisfied by the coil arrangement of each branch of the first set of windings and each branch of the second set of windings is that the number of conductors in each slot on the rotor where coils are arranged is the same; wherein, the conductor is the effective side of the coil.

10. The rotor winding of the wound-rotor brushless double-fed motor according to claim 9, characterized in that: The design conditions satisfied by the coil pitches of the first set of windings and the second set of windings are that the maximum value of the relative amplitude of the winding magnetomotive force harmonics is less than or equal to the set relative amplitude, the winding factor of the first set of windings is greater than or equal to the first set value, and the winding factor of the second set of windings is greater than or equal to the second set value.

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