Axial flux motor, low harmonic winding, and winding method of low harmonic winding

Abstract

The present invention discloses a low-harmonic winding. The number of poles of an axial flux motor is p = 5*k, and the number of slots is z = 9*k. The low-harmonic winding is a centralized winding, comprising a main winding and an auxiliary winding, each of which includes three phase windings. Each phase winding of the main winding includes 2k coils, and each phase winding of the auxiliary winding includes k coils, where k is an even number. The low-order harmonics generated by the main and auxiliary windings have the same order, frequency, and amplitude, and their initial phase angles differ by approximately 180°. Therefore, the low-order harmonics generated by the main and auxiliary windings can cancel each other out, thereby improving the performance of the axial flux motor. Furthermore, the low-harmonic winding of the present invention can produce a fundamental wave with a relatively large amplitude, which is a useful wave. The present invention also discloses an axial flux motor and a method for winding the low-harmonic winding.

Description

Technical Field

[0001] The present invention relates to the technical field of axial flux motors, and more particularly to an axial flux motor, a low harmonic winding, and a winding method for the low harmonic winding. Background Art

[0002] The concentrated winding of an axial flux motor is characterized by placing the two active sides of the coil in adjacent stator slots. While this type of winding facilitates mass production, it also produces high levels of harmonics in the armature field. Harmonics, especially low-order harmonics, increase the motor's eddy current and core losses, exacerbating vibration and noise.

[0003] However, existing technologies have not adequately addressed issues such as eddy current loss, core loss, and vibration noise in centralized windings. This is partly because most applications do not place high demands on these factors, and partly because distributed winding technology is often used to address these issues. Summary of the Invention

[0004] The present invention aims to provide a low-harmonic winding in which low-order harmonics can cancel each other, thereby improving the performance of an axial flux motor. The present invention also provides an axial flux motor and a method for winding the low-harmonic winding. To achieve the above objectives, the following technical solutions are provided:

[0005] A low-harmonic winding, an axial flux motor with a pole number p=5*k and a slot number z=9*k, is a concentrated winding including a main winding and an auxiliary winding. The main winding and the auxiliary winding each include three phase windings. Each phase winding of the main winding includes 2k coils, and each phase winding of the auxiliary winding includes k coils, where k is an even number. Low-order harmonics generated by the main winding and the auxiliary winding can offset each other.

[0006] Preferably, the turns ratio of the coil in the auxiliary winding to the coil in the main winding is 0.4-0.7.

[0007] Preferably, each coil in the phase winding of the auxiliary winding is located between two adjacent coils in the corresponding phase winding of the main winding, and the two coils form a coil pair. A phase winding of the auxiliary winding and the corresponding phase winding in the main winding form a phase mixed winding. Along the same rotation direction, the three phase mixed windings are sequentially spaced three stator teeth apart.

[0008] Preferably, the winding directions of the two coils in the coil pair are opposite, and the winding directions of the two adjacent coils in the phase winding of the auxiliary winding are opposite.

[0009] Preferably, the input terminals of the three phase windings of the main winding are A1, B1, and C1, and the output terminals are X1, Y1, and Z1, respectively; the input terminals of the three phase windings of the auxiliary winding are A2, B2, and C2, and the output terminals are X2, Y2, and Z2, respectively; the input and output terminals of the main winding adopt a delta connection method, and the input and output terminals of the auxiliary winding adopt a Y connection method;

[0010] Furthermore, A1 is connected to Y1, B1 is connected to Z1, C1 is connected to X1, X2 is connected to B1 or Z1, Y2 is connected to C1 or X1, and Z2 is connected to A1 or Y1.

[0011] Preferably, k=2, the number of poles of the axial flux motor p=10, the number of slots z=18, each phase winding of the main winding includes 4 coils, and each phase winding of the auxiliary winding includes 2 coils.

[0012] Preferably, among the four coils in the first phase winding of the main winding, the first coil enters from the first slot and exits from the second slot, the second coil enters from the fourth slot and exits from the third slot, the third coil enters from the eleventh slot and exits from the tenth slot, and the fourth coil enters from the twelfth slot and exits from the thirteenth slot;

[0013] Of the four coils in the second phase winding of the main winding, the first coil enters from the 5th slot and exits from the 4th slot, the second coil enters from the 6th slot and exits from the 7th slot, the third coil enters from the 13th slot and exits from the 14th slot, and the fourth coil enters from the 16th slot and exits from the 15th slot;

[0014] Among the four coils in the third phase winding of the main winding, the first coil enters from the 7th slot and exits from the 8th slot, the second coil enters from the 10th slot and exits from the 9th slot, the third coil enters from the 17th slot and exits from the 16th slot, and the fourth coil enters from the 18th slot and exits from the 1st slot.

[0015] Preferably, of the two coils in the first phase winding of the auxiliary winding, the first coil enters from the third slot and exits from the second slot, and the second coil enters from the 11th slot and exits from the 12th slot;

[0016] Of the two coils in the second phase winding of the auxiliary winding, the first coil enters from the 5th slot and exits from the 6th slot, and the second coil enters from the 15th slot and exits from the 14th slot;

[0017] Of the two coils in the third phase winding of the auxiliary winding, the first coil enters from the 9th slot and exits from the 8th slot, and the second coil enters from the 17th slot and exits from the 18th slot.

[0018] Preferably, k=4, the number of poles of the axial flux motor p=20, the number of slots z=36, each phase winding of the main winding includes 8 coils, and each phase winding of the auxiliary winding includes 4 coils.

[0019] Preferably, among the eight coils in the first phase winding of the main winding, the first coil enters from the 1st slot and exits from the 36th slot, the second coil enters from the 34th slot and exits from the 35th slot, the third coil enters from the 27th slot and exits from the 28th slot, the fourth coil enters from the 26th slot and exits from the 25th slot, the fifth coil enters from the 19th slot and exits from the 18th slot, the sixth coil enters from the 16th slot and exits from the 17th slot, the seventh coil enters from the 9th slot and exits from the 10th slot, and the eighth coil enters from the 8th slot and exits from the 7th slot;

[0020] Among the 8 coils in the second phase winding of the main winding, the first coil enters from the 3rd slot and exits from the 4th slot, the second coil enters from the 2nd slot and exits from the 1st slot, the third coil enters from the 31st slot and exits from the 30th slot, the fourth coil enters from the 28th slot and exits from the 29th slot, the fifth coil enters from the 21st slot and exits from the 22nd slot, the sixth coil enters from the 20th slot and exits from the 19th slot, the seventh coil enters from the 13th slot and exits from the 12th slot, and the eighth coil enters from the 10th slot and exits from the 11th slot;

[0021] Among the 8 coils in the third phase winding of the main winding, the first coil enters from the 7th slot and exits from the 6th slot, the second coil enters from the 4th slot and exits from the 5th slot, the third coil enters from the 33rd slot and exits from the 34th slot, the fourth coil enters from the 32nd slot and exits from the 31st slot, the fifth coil enters from the 25th slot and exits from the 24th slot, the sixth coil enters from the 22nd slot and exits from the 23rd slot, the seventh coil enters from the 15th slot and exits from the 16th slot, and the eighth coil enters from the 14th slot and exits from the 13th slot.

[0022] Preferably, among the four coils in the first phase winding of the auxiliary winding, the first coil enters from the 35th slot and exits from the 36th slot, the second coil enters from the 27th slot and exits from the 26th slot, the third coil enters from the 17th slot and exits from the 18th slot, and the fourth coil enters from the 9th slot and exits from the 8th slot;

[0023] Among the four coils in the second phase winding of the auxiliary winding, the first coil enters from the third slot and exits from the second slot, the second coil enters from the 11th slot and exits from the 12th slot, the third coil enters from the 21st slot and exits from the 20th slot, and the fourth coil enters from the 29th slot and exits from the 30th slot;

[0024] Among the four coils in the third phase winding of the auxiliary winding, the first coil enters from the 5th slot and exits from the 6th slot, the second coil enters from the 33rd slot and exits from the 32nd slot, the third coil enters from the 23rd slot and exits from the 24th slot, and the fourth coil enters from the 15th slot and exits from the 14th slot.

[0025] The present invention also discloses an axial flux motor, comprising a low-harmonic winding, wherein the low-harmonic winding is any one of the low-harmonic windings described above.

[0026] The present invention also discloses a low harmonic winding winding method, based on the low harmonic winding described above, comprising the following steps:

[0027] Every two coils in the 2k coils in the first phase winding of the main winding form a coil pair, and the k coil pairs are arranged around the center;

[0028] Arranging K coils of a first phase winding in the auxiliary winding around a center;

[0029] Embedding the first phase winding of the auxiliary winding into the first phase winding of the main winding, and positioning one coil of the first phase winding of the auxiliary winding between two coils of the first phase winding of the main winding, the two coils forming the coil pair to form a first phase hybrid winding;

[0030] Winding a second phase hybrid winding and a third phase hybrid winding in sequence, wherein the second phase hybrid winding is rotated three stator teeth in one direction relative to the first phase hybrid winding, thereby obtaining a position of the second phase hybrid winding;

[0031] The third phase hybrid winding is rotated by three stator teeth in the same direction relative to the second phase hybrid winding to obtain a position of the third phase hybrid winding;

[0032] The three-phase hybrid winding is integrally placed into the stator core.

[0033] It can be seen from the above technical solution that the number of poles p=5*k and the number of slots z=9*k of the axial flux motor corresponding to the low harmonic winding in the present invention. The low harmonic winding is a centralized winding, including a main winding and an auxiliary winding, and the main winding and the auxiliary winding each include three phase windings. Each phase winding of the main winding includes 2k coils, and each phase winding of the auxiliary winding includes k coils, and k is an even number. The low-order harmonics generated by the main winding and the auxiliary winding have the same order, the same frequency, and a similar amplitude, and the initial phase angle difference is close to 180°. Therefore, the low-order harmonics generated by the main winding and the auxiliary winding can cancel each other, thereby improving the performance of the axial flux motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic structural diagram of a phase winding of a main winding when k=2 is provided in a specific embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the structure of the phase winding of the auxiliary winding when k=2 is provided in a specific embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of a first phase hybrid winding when k=2 is provided in a specific embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of a second phase hybrid winding when k=2 is provided in a specific embodiment of the present invention;

[0039] Figure 5 A schematic structural diagram of the assembled first phase hybrid winding and the second phase hybrid winding when k=2 provided in a specific embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the structure of a three-phase hybrid winding after assembly when k=2 is provided in a specific embodiment of the present invention;

[0041] Figure 7 A schematic structural diagram of a stator core when k=2 is provided in a specific embodiment of the present invention;

[0042] Figure 8 A schematic structural diagram of a phase winding of a main winding when k=4 is provided in a specific embodiment of the present invention;

[0043] Figure 9 A schematic diagram of the structure of the phase winding of the auxiliary winding when k=4 is provided in a specific embodiment of the present invention;

[0044] Figure 10 A schematic structural diagram of a first phase hybrid winding when k=4 is provided in a specific embodiment of the present invention;

[0045] Figure 11 A schematic structural diagram of a second phase hybrid winding when k=4 is provided in a specific embodiment of the present invention;

[0046] Figure 12 A schematic structural diagram of the assembled first phase hybrid winding and the second phase hybrid winding when k=4 provided in a specific embodiment of the present invention;

[0047] Figure 13 A schematic diagram of the structure of a three-phase hybrid winding after assembly when k=4 is provided in a specific embodiment of the present invention;

[0048] Figure 14 A schematic structural diagram of a stator core when k=4 is provided in a specific embodiment of the present invention;

[0049] Figure 15 A schematic diagram of the connection of an outlet terminal provided in a specific embodiment of the present invention;

[0050] Figure 16 This is a comparative analysis diagram of the magnetic field harmonics generated by the armature winding of the traditional winding scheme and the scheme proposed in this invention. DETAILED DESCRIPTION

[0051] The present invention discloses a low-harmonic winding in which low-order harmonics can cancel each other, thereby improving the performance of an axial flux motor. The present invention also discloses an axial flux motor and a winding method for the low-harmonic winding.

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] The axial flux motor with the low-harmonic winding corresponding to the present invention has a pole number p = 5*k and a slot number z = 9*k, meaning the pole-to-slot ratio of the axial flux motor is 5 / 9. The low-harmonic winding is a concentrated winding, meaning the two effective sides of each coil in the low-harmonic winding are distributed between two adjacent stator slots. The number of coils is equal to the number of stator slots. The low-harmonic winding of the present invention includes two sets of windings: a main winding and an auxiliary winding. Both the main winding and the auxiliary winding include three phase windings. Specifically, the main winding includes a first phase winding, a second phase winding, and a third phase winding. The auxiliary winding includes a first phase winding, a second phase winding, and a third phase winding. Each of the three phase windings of the main winding includes 2k coils. Each of the three phase windings of the auxiliary winding includes k coils. Furthermore, k is an even number. The main winding and the auxiliary winding can operate independently and can be equivalent to two axial flux motors with the same pole-to-slot ratio.

[0054] When current flows through the winding, a magnetic field is generated in the air gap. A series of harmonics can be obtained through Fourier transform. Each harmonic has four elements: amplitude, spatial order, frequency, and initial phase angle. Since magnetic flux density is a vector, each harmonic can be considered a vector, with amplitude representing its magnitude and initial phase angle determining its direction. When the spatial order and frequency of the harmonics are the same, the vectors can be synthesized. Because the main and auxiliary windings in the present invention have the same pole-to-slot ratio of 5 / 9, the harmonics generated by the main and auxiliary windings have the same spatial order and frequency. Furthermore, the special spatial structure, coil turns ratio, and terminal connection of the main and auxiliary windings in the present invention ensure that the amplitudes of the harmonics generated by the main and auxiliary windings are equal, with initial phase angles differing by nearly 180°. Therefore, the harmonics generated by the main and auxiliary windings in the present invention can cancel each other out. Furthermore, the low-harmonic windings of the present invention can also produce a relatively large amplitude fundamental wave, which is a useful wave.

[0055] In the present invention, the turns ratio of the auxiliary winding coil to the main winding coil is 0.4-0.7. With this turns ratio, the amplitudes of the harmonics generated by the main and auxiliary windings are similar. If the initial phase angles differ by 180°, the amplitude of the two harmonics combined is close to zero, achieving optimal harmonic reduction.

[0056] Next, let's look at the structure of the low-harmonic winding: Each coil in the auxiliary phase winding is located between two adjacent coils in the corresponding main phase winding. These two coils form a coil pair. Each phase winding of the main winding then includes k coil pairs.

[0057] One phase winding of the auxiliary winding and the corresponding phase winding of the main winding form a phase-combined winding. Since both the auxiliary winding and the main winding are three-phase windings, they comprise three phase-combined windings. These three phase-combined windings are arranged such that, along the same rotational direction, the three phase-combined windings are spaced three stator teeth apart. In other words, the second phase-combined winding is rotated three stator teeth in the same direction relative to the first phase-combined winding, and the third phase-combined winding is rotated three stator teeth in the same direction relative to the second phase-combined winding.

[0058] Furthermore, the two coils in a coil pair in the phase winding of the main winding are wound in opposite directions. The winding directions of two adjacent coils in the phase winding of the auxiliary winding are also wound in opposite directions. This arrangement maximizes the amplitude of the fundamental wave of the axial flux motor.

[0059] In the present invention, the three phase windings of the main winding have their inlet terminals A1, B1, and C1, and their outlet terminals X1, Y1, and Z1, respectively. The three phase windings of the auxiliary winding have their inlet terminals A2, B2, and C2, and their outlet terminals X2, Y2, and Z2, respectively. The main winding is connected in a delta configuration, while the auxiliary winding is connected in a star configuration. The star point of the auxiliary winding is divided into three points and connected to the three corner points of the main winding. The connection between the main winding and the auxiliary winding is as follows: A1 is connected to Y1, B1 is connected to Z1, C1 is connected to X1, X2 is connected to B1 or Z1, Y2 is connected to C1 or X1, and Z2 is connected to A1 or Y1. Please refer to the attached figure. Figure 15 , attached Figure 15 This is a connection diagram for the outlet terminal.

[0060] Next, we will introduce the structure of the low harmonic winding when k = 2. When k = 2, the number of poles p = 10 and the number of slots z = 18 of the axial flux motor. Each phase of the main winding includes 4 coils, and each phase of the auxiliary winding includes 2 coils. Please refer to the attached Figure 7 , Figure 7 Schematic diagram of the structure of the stator core when k=2.

[0061] Among the four coils in the first phase winding of the main winding, the first coil enters from the 1st slot and exits from the 2nd slot, the second coil enters from the 4th slot and exits from the 3rd slot, the third coil enters from the 11th slot and exits from the 10th slot, and the fourth coil enters from the 12th slot and exits from the 13th slot.

[0062] Of the four coils in the second phase winding of the main winding, the first coil enters from the 5th slot and exits from the 4th slot, the second coil enters from the 6th slot and exits from the 7th slot, the third coil enters from the 13th slot and exits from the 14th slot, and the fourth coil enters from the 16th slot and exits from the 15th slot.

[0063] Among the four coils in the third phase winding of the main winding, the first coil enters from the 7th slot and exits from the 8th slot, the second coil enters from the 10th slot and exits from the 9th slot, the third coil enters from the 17th slot and exits from the 16th slot, and the fourth coil enters from the 18th slot and exits from the 1st slot.

[0064] Of the two coils in the first phase winding of the auxiliary winding, the first coil enters from the third slot and exits from the second slot, and the second coil enters from the eleventh slot and exits from the twelfth slot.

[0065] Of the two coils in the second phase winding of the auxiliary winding, the first coil enters from the 5th slot and exits from the 6th slot, and the second coil enters from the 15th slot and exits from the 14th slot.

[0066] Of the two coils in the third phase winding of the auxiliary winding, the first coil enters from the 9th slot and exits from the 8th slot, and the second coil enters from the 17th slot and exits from the 18th slot.

[0067] Next, we will introduce the structure of the low harmonic winding when k = 4. When k = 4, the number of poles p = 20 and the number of slots z = 36 of the axial flux motor. Each phase of the main winding includes 8 coils, and each phase of the auxiliary winding includes 4 coils. Please refer to the attached Figure 14 , Figure 14 Schematic diagram of the structure of the stator core when k=4.

[0068] Among the 8 coils in the first phase winding of the main winding, the first coil enters from the 1st slot and exits from the 36th slot, the second coil enters from the 34th slot and exits from the 35th slot, the third coil enters from the 27th slot and exits from the 28th slot, the fourth coil enters from the 26th slot and exits from the 25th slot, the fifth coil enters from the 19th slot and exits from the 18th slot, the sixth coil enters from the 16th slot and exits from the 17th slot, the seventh coil enters from the 9th slot and exits from the 10th slot, and the eighth coil enters from the 8th slot and exits from the 7th slot.

[0069] Among the 8 coils in the second phase winding of the main winding, the first coil enters from the 3rd slot and exits from the 4th slot, the second coil enters from the 2nd slot and exits from the 1st slot, the third coil enters from the 31st slot and exits from the 30th slot, the fourth coil enters from the 28th slot and exits from the 29th slot, the fifth coil enters from the 21st slot and exits from the 22nd slot, the sixth coil enters from the 20th slot and exits from the 19th slot, the seventh coil enters from the 13th slot and exits from the 12th slot, and the eighth coil enters from the 10th slot and exits from the 11th slot.

[0070] Among the 8 coils in the third phase winding of the main winding, the first coil enters from the 6th slot and exits from the 7th slot, the second coil enters from the 4th slot and exits from the 5th slot, the third coil enters from the 33rd slot and exits from the 24th slot, the fourth coil enters from the 32nd slot and exits from the 31st slot, the fifth coil enters from the 25th slot and exits from the 24th slot, the sixth coil enters from the 22nd slot and exits from the 23rd slot, the seventh coil enters from the 15th slot and exits from the 16th slot, and the eighth coil enters from the 14th slot and exits from the 13th slot.

[0071] Of the four coils in the first phase winding of the auxiliary winding, the first coil enters from the 35th slot and exits from the 36th slot, the second coil enters from the 27th slot and exits from the 26th slot, the third coil enters from the 17th slot and exits from the 18th slot, and the fourth coil enters from the 9th slot and exits from the 8th slot.

[0072] Of the four coils in the second phase winding of the auxiliary winding, the first coil enters from the 30th slot and exits from the 29th slot, the second coil enters from the 20th slot and exits from the 21st slot, the third coil enters from the 12th slot and exits from the 11th slot, and the fourth coil enters from the 2nd slot and exits from the 3rd slot.

[0073] Of the four coils in the third phase winding of the auxiliary winding, the first coil enters from the 32nd slot and exits from the 33rd slot, the second coil enters from the 23rd slot and exits from the 24th slot, the third coil enters from the 15th slot and exits from the 14th slot, and the fourth coil enters from the 6th slot and exits from the 5th slot.

[0074] The present invention also discloses a low harmonic winding winding method, comprising the following steps:

[0075] Every two coils of the 2k coils in the first phase winding of the main winding form a coil pair, and the k coil pairs are arranged around the center;

[0076] Arrange k coils of the first phase winding in the auxiliary winding around the center;

[0077] Embedding the first phase winding in the auxiliary winding into the first phase winding in the main winding, and positioning one coil of the first phase winding in the auxiliary winding between two coils of the first phase winding in the main winding, the two coils forming a coil pair, thereby forming a first phase hybrid winding;

[0078] Winding a second phase hybrid winding and a third phase hybrid winding in sequence, the second phase hybrid winding is rotated three stator teeth in one direction relative to the first phase hybrid winding, thereby obtaining a position of the second phase hybrid winding;

[0079] The third phase hybrid winding is rotated by three stator teeth in the same direction relative to the second phase hybrid winding to obtain a position of the third phase hybrid winding;

[0080] The three-phase hybrid winding is integrally placed into the stator core.

[0081] Next, we'll describe the low-harmonic winding winding method with reference to a specific embodiment. When k = 2, the axial flux motor has 10 poles and 18 slots. Each phase of the main winding includes four coils, and each phase of the auxiliary winding includes two coils. The low-harmonic winding winding method is as follows:

[0082] Each two coils in the first phase winding of the main winding form a coil pair, and the two coil pairs are arranged around the center, as shown in the attached figure. Figure 1 As shown, attached Figure 1 Schematic diagram of the structure of the phase winding of the main winding when k=2;

[0083] Arrange the two coils of the first phase of the auxiliary winding around the center, as shown in the attached figure. Figure 2 As shown, attached Figure 2 Schematic diagram of the structure of the phase winding of the auxiliary winding when k=2;

[0084] The first phase winding in the auxiliary winding is embedded in the first phase winding in the main winding, and one coil of the first phase winding in the auxiliary winding is located between two coils of the first phase winding in the main winding. The two coils form a coil pair, thereby forming a first phase hybrid winding. Figure 3 As shown, attached Figure 3 is the structural diagram of the first phase hybrid winding when k=2;

[0085] Wind the second phase mixed winding and the third phase mixed winding in sequence, as shown in the attached figure. Figure 4 As shown, attached Figure 4 The second phase hybrid winding is rotated by three stator teeth relative to the first phase hybrid winding in one direction, so as to obtain the position of the second phase hybrid winding, as shown in the attached figure. Figure 5 As shown, attached Figure 5 The schematic diagram of the structure after the first phase hybrid winding and the second phase hybrid winding are assembled when k=2 is shown. The third phase hybrid winding is rotated three stator teeth in the same direction relative to the second phase hybrid winding to obtain the position of the third phase hybrid winding, as shown in the attached figure. Figure 6 As shown, Figure 6 Schematic diagram of the structure after three-phase hybrid winding assembly when k=2;

[0086] Put the three-phase mixed winding into the stator core as a whole, as shown in the attached figure. Figure 7 As shown, attached Figure 7 Schematic diagram of the structure of the stator core when k=2.

[0087] When k = 4, the number of poles p = 20 and the number of slots z = 36 of the axial flux motor. Each phase of the main winding includes 8 coils, and each phase of the auxiliary winding includes 4 coils. The winding method of the low harmonic winding is as follows:

[0088] Each two coils in the first phase winding of the main winding form a coil pair, and the four coil pairs are arranged around the center, as shown in the attached figure. Figure 8 As shown, attached Figure 8 Schematic diagram of the structure of the phase winding of the main winding when k=4;

[0089] Arrange the four coils of the first phase of the auxiliary winding around the center, as shown in the attached figure. Figure 9 As shown, attached Figure 9Schematic diagram of the structure of the phase winding of the auxiliary winding when k=4;

[0090] The first phase winding in the auxiliary winding is embedded in the first phase winding in the main winding, and one coil of the first phase winding in the auxiliary winding is located between two coils of the first phase winding in the main winding. The two coils form a coil pair, thereby forming a first phase hybrid winding. Figure 10 As shown, attached Figure 10 Schematic diagram of the structure of the first phase hybrid winding when k=4;

[0091] Wind the second phase mixed winding and the third phase mixed winding in sequence, as shown in the attached figure. Figure 11 As shown, attached Figure 11 The second phase hybrid winding is rotated by three stator teeth relative to the first phase hybrid winding in one direction, so as to obtain the position of the second phase hybrid winding, as shown in the attached figure. Figure 12 As shown, attached Figure 12 The schematic diagram of the structure after the first phase hybrid winding and the second phase hybrid winding are assembled when k=4 is shown. The third phase hybrid winding is rotated three stator teeth in the same direction relative to the second phase hybrid winding to obtain the position of the third phase hybrid winding, as shown in the attached figure. Figure 13 As shown, attached Figure 13 Schematic diagram of the structure after three-phase hybrid winding assembly when k=4;

[0092] Put the three-phase mixed winding into the stator core as a whole, as shown in the attached figure. Figure 14 As shown, attached Figure 14 Schematic diagram of the structure of the stator core when k=4.

[0093] Please refer to the attached Figure 16 , attached Figure 16 The following is a comparative analysis of the magnetic field harmonics generated by the armature winding of the traditional winding scheme and the scheme proposed by the present invention. Figure 16 The 5th order harmonic is the fundamental wave, which is a useful wave. The 1st and 7th order harmonics have a great influence on the eddy current loss and vibration noise of the motor, and are the main targets for elimination. Figure 16 It can be seen from the figure that compared with the traditional winding, the low harmonic winding of the present invention has greatly weakened the 1st and 7th order harmonics.

[0094] The present invention also discloses an axial flux motor, including a low-harmonic winding, which is any one of the low-harmonic windings mentioned above. The low-harmonic winding has the above-mentioned effects, and the axial flux motor having the above-mentioned low-harmonic winding also has the above-mentioned effects, so they will not be repeated.

[0095] Finally, it should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0096] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0097] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A low harmonic winding, characterized in that: The number of poles of the axial flux motor is p=5*k, the number of slots is z=9*k, the low-harmonic winding is a concentrated winding, including a main winding and an auxiliary winding, the main winding and the auxiliary winding each including three phase windings, each phase winding of the main winding including 2k coils, and each phase winding of the auxiliary winding including k coils, where k is an even number, and the low-order harmonics generated by the main winding and the auxiliary winding can cancel each other; The turns ratio of the coil in the auxiliary winding to the coil in the main winding is 0.4-0.7; Each coil in the phase winding of the auxiliary winding is located between two adjacent coils in the corresponding phase winding of the main winding, and the two coils form a coil pair. One phase winding of the auxiliary winding and the corresponding phase winding of the main winding form a phase-mixed winding. Along the same rotation direction, three phase-mixed windings are sequentially spaced apart by three stator teeth. The three phase windings of the main winding have input terminals A1, B1, and C1, and the output terminals X1, Y1, and Z1, respectively. The three phase windings of the auxiliary winding have input terminals A2, B2, and C2, and the output terminals X2, Y2, and Z2, respectively. The input and output terminals of the main winding adopt a delta connection method, and the input and output terminals of the auxiliary winding adopt a Y connection method. Furthermore, A1 is connected to Y1, B1 is connected to Z1, C1 is connected to X1, X2 is connected to B1 or Z1, Y2 is connected to C1 or X1, and Z2 is connected to A1 or Y1.

2. The low harmonic winding according to claim 1, characterized in that: The winding directions of the two coils in the coil pair are opposite, and the winding directions of the two adjacent coils in the phase winding of the auxiliary winding are opposite.

3. The low harmonic winding according to claim 1, characterized in that: The k=2, the number of poles of the axial flux motor p=10, the number of slots z=18, each phase winding of the main winding includes 4 coils, and each phase winding of the auxiliary winding includes 2 coils.

4. The low harmonic winding according to claim 3, characterized in that: Among the four coils in the first phase winding of the main winding, the first coil enters from the first slot and exits from the second slot, the second coil enters from the fourth slot and exits from the third slot, the third coil enters from the eleventh slot and exits from the tenth slot, and the fourth coil enters from the twelfth slot and exits from the thirteenth slot; Of the four coils in the second phase winding of the main winding, the first coil enters from the 5th slot and exits from the 4th slot, the second coil enters from the 6th slot and exits from the 7th slot, the third coil enters from the 13th slot and exits from the 14th slot, and the fourth coil enters from the 16th slot and exits from the 15th slot; Among the four coils in the third phase winding of the main winding, the first coil enters from the 7th slot and exits from the 8th slot, the second coil enters from the 10th slot and exits from the 9th slot, the third coil enters from the 17th slot and exits from the 16th slot, and the fourth coil enters from the 18th slot and exits from the 1st slot.

5. The low harmonic winding according to claim 3, characterized in that: Of the two coils in the first phase winding of the auxiliary winding, the first coil enters from the third slot and exits from the second slot, and the second coil enters from the 11th slot and exits from the 12th slot; Of the two coils in the second phase winding of the auxiliary winding, the first coil enters from the 5th slot and exits from the 6th slot, and the second coil enters from the 15th slot and exits from the 14th slot; Of the two coils in the third phase winding of the auxiliary winding, the first coil enters from the 9th slot and exits from the 8th slot, and the second coil enters from the 17th slot and exits from the 18th slot.

6. The low harmonic winding according to claim 1, characterized in that: The k=4, the number of poles of the axial flux motor p=20, the number of slots z=36, each phase winding of the main winding includes 8 coils, and each phase winding of the auxiliary winding includes 4 coils.

7. The low harmonic winding according to claim 6, characterized in that: Among the eight coils in the first phase winding of the main winding, the first coil enters from the 1st slot and exits from the 36th slot, the second coil enters from the 34th slot and exits from the 35th slot, the third coil enters from the 27th slot and exits from the 28th slot, the fourth coil enters from the 26th slot and exits from the 25th slot, the fifth coil enters from the 19th slot and exits from the 18th slot, the sixth coil enters from the 16th slot and exits from the 17th slot, the seventh coil enters from the 9th slot and exits from the 10th slot, and the eighth coil enters from the 8th slot and exits from the 7th slot; Among the 8 coils in the second phase winding of the main winding, the first coil enters from the 3rd slot and exits from the 4th slot, the second coil enters from the 2nd slot and exits from the 1st slot, the third coil enters from the 31st slot and exits from the 30th slot, the fourth coil enters from the 28th slot and exits from the 29th slot, the fifth coil enters from the 21st slot and exits from the 22nd slot, the sixth coil enters from the 20th slot and exits from the 19th slot, the seventh coil enters from the 13th slot and exits from the 12th slot, and the eighth coil enters from the 10th slot and exits from the 11th slot; Among the 8 coils in the third phase winding of the main winding, the first coil enters from the 7th slot and exits from the 6th slot, the second coil enters from the 4th slot and exits from the 5th slot, the third coil enters from the 33rd slot and exits from the 34th slot, the fourth coil enters from the 32nd slot and exits from the 31st slot, the fifth coil enters from the 25th slot and exits from the 24th slot, the sixth coil enters from the 22nd slot and exits from the 23rd slot, the seventh coil enters from the 15th slot and exits from the 16th slot, and the eighth coil enters from the 14th slot and exits from the 13th slot.

8. The low harmonic winding according to claim 6, characterized in that: Among the four coils in the first phase winding of the auxiliary winding, the first coil enters from the 35th slot and exits from the 36th slot, the second coil enters from the 27th slot and exits from the 26th slot, the third coil enters from the 17th slot and exits from the 18th slot, and the fourth coil enters from the 9th slot and exits from the 8th slot; Among the four coils in the second phase winding of the auxiliary winding, the first coil enters from the third slot and exits from the second slot, the second coil enters from the 11th slot and exits from the 12th slot, the third coil enters from the 21st slot and exits from the 20th slot, and the fourth coil enters from the 29th slot and exits from the 30th slot; Among the four coils in the third phase winding of the auxiliary winding, the first coil enters from the 5th slot and exits from the 6th slot, the second coil enters from the 33rd slot and exits from the 32nd slot, the third coil enters from the 23rd slot and exits from the 24th slot, and the fourth coil enters from the 15th slot and exits from the 14th slot.

9. An axial flux motor comprising a low harmonic winding, characterized in that: The low harmonic winding is the low harmonic winding according to any one of claims 1 to 8.

10. A low harmonic winding winding method, characterized in that: The low harmonic winding according to any one of claims 1 to 8 comprises the following steps: Every two coils in the 2k coils in the first phase winding of the main winding form a coil pair, and the k coil pairs are arranged around the center; Arranging K coils of a first phase winding in the auxiliary winding around a center; Embedding the first phase winding of the auxiliary winding into the first phase winding of the main winding, and positioning one coil of the first phase winding of the auxiliary winding between two coils of the first phase winding of the main winding, the two coils forming the coil pair to form a first phase hybrid winding; Winding a second phase hybrid winding and a third phase hybrid winding in sequence, wherein the second phase hybrid winding is rotated three stator teeth in one direction relative to the first phase hybrid winding, thereby obtaining a position of the second phase hybrid winding; The third phase hybrid winding is rotated by three stator teeth in the same direction relative to the second phase hybrid winding to obtain a position of the third phase hybrid winding; The three-phase hybrid winding is integrally placed into the stator core.

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