CN212304935U - Winding and axial magnetic motor - Google Patents

Abstract

The utility model discloses a winding, the slot number z of the stator slot that the winding corresponds is 6 k, and the pole number p of the axial flux motor that the winding corresponds is 3 k 1, and k is positive odd. Therefore, the number of poles of the axial flux motor is close to that of stator slots, and therefore the cogging torque of the axial flux motor is effectively reduced. In addition, when the number p/2 of the pole pairs is even, the two sets of windings interact to eliminate odd-order harmonics. When the number of pole pairs p/2 is odd, the two sets of windings interact to eliminate even-order harmonics. When the number of pole pairs p/2 is even, the waves of odd orders are all harmonic waves, and when the number of pole pairs p/2 is odd, the waves of even orders are all harmonic waves. Therefore the utility model provides a winding can eliminate axial flux motor's odd order harmonic or even order harmonic under the condition of the tooth's socket torque of effective reduction axial flux motor to improve axial flux motor's performance. The utility model also discloses an axial magnetic flux motor.

Description

Winding and axial magnetic motor

Technical Field

The utility model relates to an axial flux motor technical field, more specifically say, relate to a winding and an axial flux motor.

Background

The fractional-slot concentrated winding axial flux motor has the characteristics of simple manufacturing process, high power density and torque density, small cogging torque and the like, and is widely applied. When the number of poles of the axial flux motor is close to the number of teeth of the stator core, particularly when the difference between the number of poles and the number of teeth of the stator core is 1, the cogging torque of the axial flux motor can be effectively reduced. However, when the number of teeth and the number of poles of the stator core of the axial flux motor are close, the armature magnetic field generates rich harmonic waves after the current is applied to the winding, and the harmonic waves, particularly the low-order harmonic waves, increase the eddy current loss and the core loss of the motor, deteriorate the vibration noise and seriously affect the performance of the motor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at eliminating the odd order or even order harmonic of axial flux motor under the condition of effectively reducing axial flux motor's tooth's socket torque to improve axial flux motor's performance.

In order to realize the purpose, the following technical scheme is provided:

a winding capable of eliminating harmonic waves is characterized in that the number z of slots of a stator slot corresponding to the winding is 6 x k, the number p of poles of an axial flux motor corresponding to the winding is 3 x k +/-1, and k is a positive odd number;

the winding comprises two sets of groups, wherein the two sets of windings are three-phase windings, the phase winding of each phase of the two sets of windings comprises k coils, three pairs of phase windings are formed in the two sets of windings, and the two phase windings of each pair of phase windings correspond to each other;

when the number of pole pairs p/2 is even, the two sets of windings interact to eliminate odd-order harmonics;

when the number of pole pairs p/2 is odd, the two sets of windings interact to eliminate even-order harmonics.

Preferably, in the three pairs of phase windings, the corresponding effective conductors in each pair of phase windings are symmetrical with respect to the center of the stator core.

Preferably, in the two sets of windings, the effective conductors corresponding to the three phase windings in each set of windings are sequentially different by z/3 stator slots.

Preferably, the winding pitches y of the two sets of windings are both y equal to 2, and the two sets of windings are wound around the odd numbered stator slots and the even numbered stator slots respectively.

Preferably, when the number of pole pairs p/2 is odd, if two phase windings in each of the three pairs of phase windings adopt a series connection mode, in each of the three pairs of phase windings, the head ends of the two phase windings are respectively used as an input end and an output end, and the tail ends of the two phase windings are connected together; if two phase windings in pairs of the three pairs of phase windings are connected in parallel, in each pair of the three pairs of phase windings, the head end of one phase winding and the tail end of the other phase winding are connected together to be used as an input end, and the head end of the other phase winding and the tail end of the one phase winding are connected together to be used as an output end.

Preferably, the serial connection mode is serial star connection or serial angle connection; the parallel connection mode is parallel star connection or parallel angle connection.

Preferably, when the number of pole pairs p/2 is even, if two phase windings in pairs of the three pairs of phase windings are connected in series, in each pair of the three pairs of phase windings, the head end of one phase winding serves as an input end, the tail end of the other phase winding serves as an output end, and the tail end of the one phase winding is connected with the head end of the other phase winding; if two paired phase windings in the three pairs of phase windings adopt a parallel connection mode, in each pair of phase windings of the three pairs of phase windings, the head ends of the two phase windings are connected together to be used as an input end, and the tail ends of the two phase windings are connected together to be used as an output end.

Preferably, the serial connection mode is serial star connection or serial angle connection; the parallel connection mode is parallel star connection or parallel angle connection.

Preferably, if two phase windings in pairs of the three pairs of phase windings are connected in series, each pair of phase windings is an integral phase winding.

Preferably, z is 18 and p is 8, and the phase winding of each phase of the two sets of windings comprises 3 coils;

the first coil of the first phase winding in the first set of windings in the two sets of windings enters from the slot 1 and penetrates out from the slot 3, the second coil enters from the slot 5 and penetrates out from the slot 3, and the third coil enters from the slot 5 and penetrates out from the slot 7;

the first coil of the second phase winding in the first set of windings enters from the 13 slots and penetrates out from the 15 slots, the second coil enters from the 17 slots and penetrates out from the 15 slots, and the third coil enters from the 17 slots and penetrates out from the 1 slot;

the first coil of the third phase winding in the first set of windings enters from the 7 slots and penetrates out from the 9 slots, the second coil enters from the 11 slots and penetrates out from the 9 slots, and the third coil enters from the 11 slots and penetrates out from the 13 slots.

Preferably, the first and second electrodes are formed of a metal,

the first coil of the first phase winding in the second set of windings of the two sets of windings enters from the 10 slots and penetrates out from the 12 slots, the second coil penetrates in from the 14 slots and penetrates out from the 12 slots, and the third coil penetrates in from the 14 slots and penetrates out from the 16 slots;

the first coil of the second phase winding in the second set of windings enters from the 4 slots, penetrates out of the 6 slots, enters from the 8 slots and penetrates out of the 10 slots;

the first coil of the third phase winding in the second set of windings enters from 16 slots and exits from 18 slots, the second coil enters from 2 slots and exits from 18 slots, and the third coil enters from 2 slots and exits from 4 slots.

The utility model also provides an axial flux motor, including the winding, the winding is above-mentioned arbitrary winding.

As can be seen from the above technical solutions, the number z of the stator slots corresponding to the winding is 6 × k, the number p of the poles of the axial flux motor corresponding to the winding is 3 × k ± 1, and k is a positive odd number. Therefore, the number of poles of the axial flux motor is close to that of stator slots, and therefore the cogging torque of the axial flux motor is effectively reduced. In addition, when the number p/2 of the pole pairs is even, the two sets of windings interact to eliminate odd-order harmonics. When the number of pole pairs p/2 is odd, the two sets of windings interact to eliminate even-order harmonics. When the number of pole pairs p/2 is even, the waves of odd orders are all harmonic waves, and when the number of pole pairs p/2 is odd, the waves of even orders are all harmonic waves. Therefore the utility model provides a winding can eliminate axial flux motor's odd order or even order harmonic under the condition of the tooth's socket torque that effectively reduces axial flux motor to improve axial flux motor's performance.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without inventive efforts.

Fig. 1 is a schematic diagram of a pair of phase windings of an 8-stage 18-slot motor according to an embodiment of the present invention;

FIG. 2 is a schematic view of the pair of phase windings of FIG. 1 after being placed on a stator core;

fig. 3 is a schematic structural diagram of an 8-pole 18-slot winding according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a set of windings wound around odd numbered stator slots according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another set of windings wound around even numbered stator slots according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an integral phase winding according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a series star connection of paired phase windings when the number of pole pairs p/2 is odd according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a series angular connection of paired phase windings when the number of pole pairs p/2 is odd according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a parallel star connection of paired phase windings when the number of pole pairs p/2 is odd according to an embodiment of the present invention;

fig. 10 is a schematic diagram of parallel angular connection of paired phase windings when the number of pole pairs p/2 is odd according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a series star connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a series angular connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a parallel star connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention;

fig. 14 is a schematic diagram of parallel angular connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention;

fig. 15 is a comparison diagram of harmonic waves generated by the 8-pole 18-slot motor provided by the present invention and the existing motor.

Detailed Description

The utility model discloses a can eliminate winding of odd number order or even number order harmonic, this winding can eliminate the odd number order or even number order harmonic of axial flux motor under the condition of effectively reducing axial flux motor's tooth's socket torque to improve axial flux motor's performance. The utility model also discloses an axial magnetic flux motor.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The applicant has found that when the pole pair number p/2 is even, the dominant wave appears only in waves of even order, while waves of odd order are all harmonics, and when the pole pair number p/2 is odd, the dominant wave appears only in waves of odd order, while waves of even order are all harmonics. Based on this, the applicant has creatively designed a winding capable of eliminating odd-order or even-order harmonics.

In the winding of the present invention, the number of slots z of the stator slot corresponding to the winding is 6 × k, the number of poles p of the axial flux motor corresponding to the winding is 3 × k ± 1, and k is a positive odd number. Because the number p of poles of the axial flux motor is closer to the number z of stator slots, the cogging torque of the axial flux motor is effectively reduced.

The utility model provides a winding includes two sets of stack, and these two sets of windings are three-phase winding, and every looks phase winding in these two sets of windings all includes k coils, in these two sets of windings, forms three pairs of phase windings, and every two phase windings to in the phase winding are corresponding.

For example, the following steps are carried out: for example, for an 8-pole 18-slot motor, the motor comprises two sets of windings, wherein one set of windings comprises an A1 phase winding, a B1 phase winding and a C1 phase winding. The A1 phase winding, the B1 phase winding and the C1 phase winding all comprise 3 coils. And the other set of windings comprises an A2 phase winding, a B2 phase winding and a C2 phase winding. The A2 phase winding, the B2 phase winding and the C2 phase winding all comprise 3 coils. The A1 phase winding and the A2 phase winding are a first pair of phase windings, the B1 phase winding and the B2 phase winding are a second pair of phase windings, and the C1 phase winding and the C2 phase winding are a third pair of phase windings.

When the number of pole pairs p/2 is an even number, the utility model provides a two sets of winding interactions can eliminate odd order harmonic. When the number of pole pairs p/2 is an odd number, the even order harmonic is eliminated by the interaction of the two sets of windings. When the number of pole pairs p/2 is even, the waves of odd orders are all harmonic waves, and when the number of pole pairs p/2 is odd, the waves of even orders are all harmonic waves. Therefore the utility model provides a winding can eliminate axial flux motor's harmonic under the condition of the tooth's socket torque that effectively reduces axial flux motor to improve axial flux motor's performance.

The characteristics of the two sets of windings are specifically described below: referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a pair of phase windings of an 8-stage 18-slot motor according to an embodiment of the present invention; fig. 2 is a schematic view of the pair of phase windings of fig. 1 after being placed on a stator core. In the three pairs of phase windings, the corresponding effective conductors in each pair of phase windings are symmetrical with respect to the center of the stator core. In other words, the corresponding active conductors in each pair of phase windings are spatially 180 ° apart. Or the corresponding active conductors in each pair of phase windings differ by z/2 stator slots. For example, an 8-pole, 18-slot motor: the corresponding active conductors in the a1 phase winding and the a2 phase winding are symmetrical about the center of the stator core, or the corresponding active conductors in the a1 phase winding and the a2 phase winding differ by 9 stator slots. The corresponding effective conductors in the B1 phase winding and the B2 phase winding are symmetrical about the center of the stator core, or the corresponding effective conductors in the B1 phase winding and the B2 phase winding differ by 9 stator slots. The corresponding effective conductors in the C1 phase winding and the C2 phase winding are symmetrical about the center of the stator core, or the corresponding effective conductors in the C1 phase winding and the C2 phase winding differ by 9 stator slots.

And the effective conductors corresponding to the three phase windings in each set of windings have a phase difference of z/3 stator slots in sequence. And the winding pitches y of the two sets of windings are both equal to 2, and the two sets of windings are wound around the stator slots with odd numbers and the stator slots with even numbers respectively.

Continuing with the example of an 8-pole 18-slot: in the first set of windings, the a1 phase winding is 6 stator slots different from the B1 phase winding and the B1 phase winding is 6 stator slots different from the C1 phase winding. In the second set of windings, the a2 phase winding is 6 stator slots different from the B2 phase winding and the B2 phase winding is 6 stator slots different from the C2 phase winding.

Supposing that odd numbered stator slots are selected, and even numbered stator slots are ignored, the A1 phase winding is wound in the 1 slot, the 3 slot, the 5 slot and the 7 slot in sequence according to the winding rule of the concentrated winding. The B1 phase winding is wound in 13 slots, 15 slots, 17 slots and 1 slot in sequence. The C1 phase winding is wound in 7 slots, 9 slots, 11 slots and 13 slots in sequence. As shown in fig. 4, fig. 4 is a schematic structural diagram of a set of windings wound around odd numbered stator slots according to an embodiment of the present invention.

And selecting the rest stator slots with even serial numbers, and then winding the A2 phase winding in 10 slots, 12 slots, 14 slots and 16 slots in sequence according to the winding rule of the concentrated winding. The B2 phase winding is wound in 4 slots, 6 slots, 8 slots and 10 slots in sequence. The C2 phase winding is wound in 16 slots, 18 slots, 2 slots and 4 slots in sequence. As shown in fig. 5, fig. 5 is a schematic structural diagram of another set of windings wound around even numbered stator slots according to an embodiment of the present invention. And finishing the winding of the two sets of windings.

It should be noted that the winding rule of the concentrated winding is well known to those skilled in the art, and therefore, the description thereof is omitted here.

Wiring to describe the wiring of two phase windings in pairs of three phase windings: when the number p/2 of the pole pairs is odd, if the two phase windings in pairs in the three pairs of phase windings adopt a series connection mode, the head ends of the two phase windings in each pair of the three pairs of phase windings are respectively used as an input end and an output end, and the tail ends of the two phase windings are connected together. And if a serial connection mode is adopted, the serial star connection or the serial corner connection can be realized. The series connection can reduce the current, but high-voltage power supply equipment is required to be connected.

In this document, the head end of the phase winding refers to a1, B1, C1, a2, B2, and C2, and the tail end of the phase winding refers to X1, Y1, Z1, X2, Y2, and Z2.

Referring to fig. 7 and 8, fig. 7 is a schematic diagram of a series star connection of paired phase windings when the number of pole pairs p/2 is an odd number according to an embodiment of the present invention; fig. 8 is a schematic diagram of a series angular connection of paired phase windings when the number of pole pairs p/2 is odd according to an embodiment of the present invention. In fig. 7 and 8, a1 and a2 serve as input and output terminals, respectively, and X1 and X2 are connected together. B1 and B2 serve as input and output terminals, respectively, and Y1 and Y2 are connected together. C1 and C2 serve as input and output terminals, respectively, and Z1 and Z2 are connected together.

When the number of the pole pairs p/2 is odd, if two phase windings in pairs of the three pairs of phase windings adopt a parallel connection mode, in each pair of the three pairs of phase windings, the head end of one phase winding is connected with the tail end of the other phase winding to be used as an input end, and the head end of the other phase winding is connected with the tail end of the one phase winding to be used as an output end. The parallel connection mode can be connected into low-voltage power supply equipment but the current is larger.

Referring to fig. 9 and 10, fig. 9 is a schematic diagram of a parallel star connection of paired phase windings when the number of pole pairs p/2 is an odd number according to an embodiment of the present invention; fig. 10 is a schematic diagram of parallel angular connection of paired phase windings when the number of pole pairs p/2 is odd according to an embodiment of the present invention. In fig. 9 and 10, a1 is connected with X2 as an input terminal, and a2 is connected with X1 as an output terminal. B1 is connected together with Y2 as an input, B2 is connected together with Y1 as an output. C1 is connected together with Y2 as an input and C2 is connected together with Z1 as an output.

When the number of pole pairs p/2 is even, if two phase windings in pairs of the three phase windings are connected in series, in each phase winding in the three phase windings, the head end of one phase winding serves as an input end, the tail end of the other phase winding serves as an output end, and the tail end of the one phase winding is connected with the head end of the other phase winding. If the outlet ends of the two sets of windings adopt a series connection mode, the series connection mode is series star connection or series angular connection

Referring to fig. 11 and 12, fig. 11 is a schematic diagram of a series star connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention; fig. 12 is a schematic diagram of a series angular connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention. In fig. 11 and 12, X1 is connected to a2, a1 as an input, and X2 as an output. Y1 is connected to B2, with B1 as the input and Y2 as the output. Z1 is connected to C2, with C1 as the input and Z2 as the output.

When the number of pole pairs p/2 is even, if the two phase windings in pairs of the three phase windings adopt a parallel connection mode, in each phase winding in the three phase windings, the head ends of the two phase windings are connected together to be used as an input end, and the tail ends of the two phase windings are connected together to be used as an output end. If the two paired phase windings in the three pairs of phase windings adopt a parallel connection mode, the parallel connection mode is parallel star connection or parallel angular connection.

Referring to fig. 13 and 14, fig. 13 is a schematic diagram of parallel star connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention; fig. 14 is a schematic diagram of parallel angular connection of paired phase windings when the number of pole pairs p/2 is an even number according to an embodiment of the present invention. In fig. 13 and 14, a1 and a2 are connected together as an input terminal, and X1 and X2 are connected together as an output terminal. B1 is connected together with B2 as input and Y1 is connected together with Y2 as output. C1 is connected together with C2 as an input and Z1 is connected together with Z2 as an output.

Adopt the utility model provides a mode of connection can optimize the effect of cutting the harmonic, and the effect of this cutting the harmonic is for cutting odd order harmonic when the number of pole pairs p/2 is the even number, cuts the effect of even order harmonic when the number of pole pairs p/2 is the odd number.

Whether the number of pole pairs p/2 is even or odd, if two phase windings in pairs of three phase windings are connected in series, each phase winding pair is an integral phase winding. Two outlet ends to be connected together are omitted and directly bypassed at one time. Therefore, the number of the connector lugs is reduced, and the space of the junction box is reduced.

Referring to fig. 6, fig. 6 is a schematic diagram of an integral phase winding according to an embodiment of the present invention. In fig. 6, the outlet terminals a2 and X1 are omitted and the coil is once bypassed to form a single integral phase winding with a head end a1 and a tail end X2.

The utility model also discloses a specific structure of winding when z 18, p 8: referring to fig. 3, fig. 3 is a schematic structural diagram of an 8-pole 18-slot winding according to an embodiment of the present invention, in which a first coil of a first phase winding in a first set of windings of two sets of windings enters from slot 1 and penetrates out from slot 3, a second coil enters from slot 5 and penetrates out from slot 3, and a third coil enters from slot 5 and penetrates out from slot 7;

the first coil of the second phase winding in the first set of windings enters from the 13 slots and penetrates out from the 15 slots, the second coil enters from the 17 slots and penetrates out from the 15 slots, and the third coil enters from the 17 slots and penetrates out from the 1 slot;

the first coil of the third phase winding in the first set of windings enters from the 7 slots and passes out from the 9 slots, the second coil enters from the 11 slots and passes out from the 9 slots, and the third coil enters from the 11 slots and passes out from the 13 slots.

The first coil of the first phase winding in the second set of windings of the two sets of windings enters from the 10 slots and penetrates out from the 12 slots, the second coil penetrates in from the 14 slots and penetrates out from the 12 slots, and the third coil penetrates in from the 14 slots and penetrates out from the 16 slots;

the first coil of the second phase winding in the second set of windings enters from the 4 slots, penetrates out of the 6 slots, enters from the 8 slots and penetrates out of the 10 slots;

the first coil of the third phase winding in the second set of windings enters from 16 slots and exits from 18 slots, the second coil enters from 2 slots and exits from 18 slots, and the third coil enters from 2 slots and exits from 4 slots.

It should be noted that the stator slots are numbered for convenience of description only, and that a certain coil must enter and exit from a stator slot with a specific number is not necessarily the case, and only the relative position relationship between the coils is protected.

Referring to fig. 15, fig. 15 is a comparison diagram of harmonics generated by an 8-pole 18-slot motor and a conventional motor according to the present invention, and can be seen from fig. 15: the utility model discloses the 8 utmost point 18 groove motor space orders of well are the ripples of 4 for the dominant wave, and the ripples of all the other orders are the harmonic, and harmonic amplitude is the better more. As can be seen from fig. 15, compared with the conventional motor, the harmonic content of the armature magnetic field of the present invention is significantly reduced. And because the number of the pole pairs of the utility model is an even number, the harmonic of odd order is completely eliminated.

The utility model also discloses a winding method of winding, this winding is above-mentioned arbitrary winding, and this method includes: sequentially winding a first set of winding in the two sets of windings in odd-numbered or even-numbered stator slots according to the z/2 slot and the winding rule of the concentrated winding;

and sequentially winding a second set of winding in the two sets of windings in the rest stator slots according to the z/2 slot and the winding rule of the concentrated winding, and simultaneously enabling the corresponding effective conductors in each pair of phase windings to be symmetrical about the center of the stator core.

Further, if two phase windings in pairs of the three pairs of phase windings adopt a series connection mode, each pair of phase windings is integrated into an integral phase winding, please refer to fig. 6, and fig. 6 is a schematic diagram of an integral phase winding according to an embodiment of the present invention.

The winding method of the 8-pole 18-slot winding has been described in detail above, and therefore will not be described in detail here.

The utility model also discloses an axial magnetic flux motor, including the winding, this winding is above-mentioned arbitrary winding, and above-mentioned winding has above-mentioned effect, and the axial flux motor that has above-mentioned winding has above-mentioned effect equally, so this paper is no longer repeated.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A winding, wherein the number z of slots of a stator slot corresponding to the winding is 6 × k, the number p of poles of an axial flux motor corresponding to the winding is 3 × k ± 1, and k is a positive odd number;

the winding comprises two sets of groups, wherein the two sets of windings are three-phase windings, the phase winding of each phase of the two sets of windings comprises k coils, three pairs of phase windings are formed in the two sets of windings, and the two phase windings of each pair of phase windings correspond to each other;

when the number of pole pairs p/2 is even, the two sets of windings interact to eliminate odd-order harmonics;

when the number of pole pairs p/2 is odd, the two sets of windings interact to eliminate even-order harmonics.

2. A winding according to claim 1, wherein, in the three pairs of phase windings, the corresponding effective conductors in each pair of phase windings are symmetrical with respect to the center of the stator core.

3. A winding according to claim 1, wherein in the two sets of windings, the effective conductors corresponding to the three phase windings in each set of windings are sequentially different by z/3 stator slots.

4. A winding according to claim 1, wherein the winding pitch y of both sets of windings is 2, and the two sets of windings are wound around odd numbered stator slots and even numbered stator slots, respectively.

5. A winding according to claim 1, wherein when the number of pole pairs p/2 is odd, if two of the three pairs of phase windings are connected in series, the head ends of the two phase windings in each of the three pairs of phase windings are respectively used as the input end and the output end, and the tail ends of the two phase windings are connected together;

if two phase windings in pairs of the three pairs of phase windings are connected in parallel, in each pair of the three pairs of phase windings, the head end of one phase winding and the tail end of the other phase winding are connected together to be used as an input end, and the head end of the other phase winding and the tail end of the one phase winding are connected together to be used as an output end.

6. A winding according to claim 5, wherein the serial connection is a serial star connection or a serial angular connection; the parallel connection mode is parallel star connection or parallel angle connection.

7. A winding according to claim 1, wherein when the number of pole pairs p/2 is even, if two phase windings in pairs of the three phase windings are connected in series, then in each of the three phase windings, the head end of one phase winding serves as an input end, the tail end of the other phase winding serves as an output end, and the tail end of the one phase winding is connected with the head end of the other phase winding;

if two paired phase windings in the three pairs of phase windings adopt a parallel connection mode, in each pair of phase windings of the three pairs of phase windings, the head ends of the two phase windings are connected together to be used as an input end, and the tail ends of the two phase windings are connected together to be used as an output end.

8. A winding according to claim 7, wherein the serial connection is a serial star connection or a serial angular connection; the parallel connection mode is parallel star connection or parallel angle connection.

9. A winding according to claim 1, wherein each pair of phase windings is a single integral phase winding if the two phase windings of the three pairs of phase windings are connected in series.

10. A winding according to claim 1, wherein z is 18 and p is 8, and the phase winding of each phase of said two sets of windings comprises 3 coils;

the first coil of the first phase winding in the first set of windings in the two sets of windings enters from the slot 1 and penetrates out from the slot 3, the second coil enters from the slot 5 and penetrates out from the slot 3, and the third coil enters from the slot 5 and penetrates out from the slot 7;

the first coil of the second phase winding in the first set of windings enters from the 13 slots and penetrates out from the 15 slots, the second coil enters from the 17 slots and penetrates out from the 15 slots, and the third coil enters from the 17 slots and penetrates out from the 1 slot;

the first coil of the third phase winding in the first set of windings enters from the 7 slots and penetrates out from the 9 slots, the second coil enters from the 11 slots and penetrates out from the 9 slots, and the third coil enters from the 11 slots and penetrates out from the 13 slots.

11. A winding according to claim 10,

the first coil of the first phase winding in the second set of windings of the two sets of windings enters from the 10 slots and penetrates out from the 12 slots, the second coil penetrates in from the 14 slots and penetrates out from the 12 slots, and the third coil penetrates in from the 14 slots and penetrates out from the 16 slots;

the first coil of the second phase winding in the second set of windings enters from the 4 slots, penetrates out of the 6 slots, enters from the 8 slots and penetrates out of the 10 slots;

the first coil of the third phase winding in the second set of windings enters from 16 slots and exits from 18 slots, the second coil enters from 2 slots and exits from 18 slots, and the third coil enters from 2 slots and exits from 4 slots.

12. An axial flux machine comprising a winding, wherein the winding is as claimed in any one of claims 1 to 11.

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