CN114785017A

CN114785017A - Flat copper wire wave winding armature winding for three-phase motor and winding method thereof

Info

Publication number: CN114785017A
Application number: CN202210412788.1A
Authority: CN
Inventors: 孟秀蓓; 金鑫
Original assignee: Jiangsu Huayong Composite Materials Co Ltd
Current assignee: Jiangsu Huayong Composite Materials Co Ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-07-22

Abstract

The utility model provides a flat type copper wire wave winding armature winding for three-phase motor, includes two parallel branch roads, and every utmost point every looks groove number is the even number, and the number of piles of every groove flat type copper wire is the even number, and the winding inlays in corresponding inslot with the wave winding mode, and the pitch of leading-out terminal and non-leading-out terminal pitch are equal and are first pitch. The structure adopts even layers of flat wire short-distance wave windings to improve the waveform of a motor magnetic field and weaken magnetic field harmonic waves, the pitches of a leading-out terminal and a non-leading-out terminal are equal, the coil manufacturing and embedding can be optimized, and simultaneously each branch circuit is adjusted to comprise conductors of different layers, so that the impedance and the temperature of different branch circuits of the motor are balanced.

Description

Flat copper wire wave winding armature winding for three-phase motor and winding method thereof

Technical Field

The invention relates to the field of new energy automobile driving motors, in particular to a flat copper wire wave-wound armature winding for a three-phase motor and a winding method thereof.

Background

For example, in the short-pitch winding connection method of the flat wave winding disclosed in patent No. CN2040030773U (the entire content of the patent is incorporated herein by reference), in order to weaken 5 and 7 harmonics, the short-pitch winding is used, in which the non-outgoing end windings are connected in a short pitch of 10 and the outgoing end windings are connected in a pitch of 14, so that the alternate connection is performed, the pitches at the two ends of the coil are different, and the coil is complicated to manufacture and embed. In addition, fig. 1 shows a wiring diagram of a six-layer flat short-pitch winding in the prior art.

In addition, in the prior art, when the multilayer conductor flat wire winding is connected, the impedance between different branches is unbalanced due to the position and the temperature of the layer, so that the performance difference is caused.

Therefore, there is a need to develop a flat copper wave-wound armature winding for a three-phase motor and a winding method thereof to solve one or more of the above-mentioned technical problems.

Disclosure of Invention

In order to solve at least one technical problem, according to an aspect of the present invention, there is provided a flat copper wire wave-wound armature winding for a three-phase motor, the winding including two parallel branches, the number of slots of each phase of each pole being an even number, the number of layers of the flat copper wire of each slot being an even number, the winding being embedded in the corresponding slot in a wave-wound manner, the pitch of a leading end and the pitch of a non-leading end being equal and both being a first pitch, a conductor coil at a position where the leading end is replaced having a second pitch different from the first pitch, the number of stator slots of the three-phase motor being equal to N, N being equal to or greater than 36, the number of pole pairs being equal to 4, the number of slots of each phase of each pole being 2, the number of layers of the flat copper wire of each slot being 6, and the pole pitch being 6;

wherein, a third five layer of the N-shaped groove, a first to a sixth layer of the 1-shaped groove and a second, a fourth and a sixth layer of the 2-shaped groove belong to the conductor of phase A, a first, a third and a fifth layer of the 2-shaped groove, a first to a sixth layer of the 3-shaped groove and a second, a fourth and a sixth layer of the 4-shaped groove belong to the phase C negative sequence, a first, a third and a fifth layer of the 4-shaped groove, a first to a sixth layer of the 5-shaped groove, a second, a fourth and a sixth layer of the 6-shaped groove belong to the phase B, a first, a third, a fifth layer of the 6-shaped groove, a first to a sixth layer of the 7-shaped groove, a second, a fourth and a sixth layer of the 8-shaped groove belong to the phase A negative sequence, a first, a third, a fifth and a sixth layer of the 8-shaped groove, a first to a sixth layer of the 9-shaped groove, a second, a fourth and a sixth layer of the 10-shaped groove belong to the phase C, a first, a third, a fifth layer of the 11-shaped groove, a first, a third and a fourth layer of the 12-shaped groove belong to the negative sequence B, and so on the sixth layer of the N-shaped groove belong to the fourth phase B;

each phase is provided with a first branch and a second branch which are connected in parallel, the first branch is circularly connected with the first layer according to six and five layers, the fourth and three layers and the second and one layer, and the second branch is circularly connected with the second layer, the third and four layers and the fifth and six layers.

According to a further aspect of the invention, said first pitch is equal to the pole pitch.

According to yet another aspect of the invention, the second pitch is greater than the pole pitch.

According to yet another aspect of the invention, the first pitch is 6 and the second pitch is 7.

According to another aspect of the invention, the two parallel branches of the a, B and C phases are connected in the same manner.

According to another aspect of the present invention, there is also provided a method of winding the aforementioned flat copper wire wave-wound armature winding for a three-phase motor, characterized by comprising the steps of:

the first branch of the phase A is circularly connected with the fifth branch, the fourth branch, the third branch and the fourth branch according to the sixth branch and the fifth branch; the connection of the sixth layer and the fifth layer is firstly carried out, the incoming line U1 enters from the sixth layer of the No. 1 groove, the non-outgoing line end direction directly crosses the fifth layer of the No. 7 groove through the integral pitch y which is 6, the outgoing line end direction also crosses the sixth layer conductor of the No. 13 groove through the integral pitch y which is 6, the fifth layer conductor of the No. 19 groove is crossed through the pitch 6, the sixth layer conductor of the No. 25 groove is crossed through the pitch 6, the fifth layer conductor of the No. 31 groove is crossed through the pitch 6, the circulation is carried out in sequence, the fifth layer conductor of the No. 6, 6 to 43 grooves is crossed through the pitch 6, the layers are required to be changed, the fourth layer conductor of the No. 1 groove is changed through the pitch 6, the circulation connection of the four and three layers of conductors is carried out, the third layer of the No. 6, 6 and 43 grooves is needed to be changed, the layers are changed to the second layer of the No. 1 groove through the pitch 6, the circulation connection of the second and third layer conductors is carried out, and the circulation connection of the second and third layer of the second layer conductors is carried out, and the second layer is carried out, the continuous according to the

pitch

6, 6. 6, 6 to 43 first layers, wherein the layer is required to be changed to the 6 th layer of the No. 2 groove, the circulation connection of six and five layers, four and three layers and two and one layer is continuously carried out according to the pitches of 6, 6 and 6, and finally the outlet end is marked with X1 at the first layer of the No. 44 groove; the phase A second branch is circularly connected with the first layer and the second layer, the third layer and the fourth layer, and the fifth layer and the sixth layer; firstly, connecting a first layer with a second layer, enabling an incoming line U2 to enter from the first layer of a No. 1 groove, completing the connection of conductors of the first layer and the second layer through

cyclic pitches

6, 6 and 6, starting layer changing, performing cyclic connection of conductors of three and four layers through the pitches 6 to the third layer of the No. 1 groove, and finally, leading out a line X2 from the sixth layer of the No. 6 groove; completing a second branch of the phase A; the winding modes of the phase B, the phase C and the phase A are the same.

According to yet another aspect of the present invention, N is equal to 48.

According to yet another aspect of the present invention, N is equal to 72.

The invention can obtain one or more of the following technical effects:

1. the arrangement mode of even layers of flat wire short-pitch wave windings is adopted to improve the waveform of the magnetic field of the motor and weaken the harmonic wave of the magnetic field;

2. on the basis of a short-distance winding of a traditional flat-wire wave winding, the pitches of a wire outlet end and a non-wire outlet end are changed and are equal, the coil manufacturing and embedding can be optimized, and meanwhile, each branch circuit is adjusted to comprise conductors in different layers, so that the impedance and the temperature of different branch circuits of the motor are balanced;

3. the inherent defect of large waveform harmonic distortion of a motor magnetic field or counter electromotive force caused by the integral pitch winding of the conventional flat wire motor is overcome;

4. the manufacturing process of the coil is simplified, the trouble of complex manufacturing process caused by the diversity of pitches of the conventional flat wire coil is solved, and errors are avoided.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of a wiring diagram of a short-distance winding with six layers of flat wires in the prior art.

Fig. 2 is a schematic view of a flat copper wire wave wound armature winding for a three phase motor according to a preferred embodiment of the present invention.

Fig. 3 is a schematic diagram of a non-outlet end hairpin in accordance with a preferred embodiment of the invention.

Fig. 4 is a comparison graph of back electromotive force waveforms of the full-range and short-range three-phase lines.

FIG. 5 is a graph of fundamental and harmonic amplitude comparisons for full pitch and short pitch windings after Fourier decomposition.

FIG. 6 is a graph of harmonic amplitude comparison of full pitch windings and short pitch windings after Fourier decomposition.

Detailed Description

The best mode for carrying out the invention will now be described in detail by way of preferred embodiments with reference to the accompanying drawings, wherein the detailed description is intended to illustrate the invention in detail without limiting the invention thereto, and various changes and modifications can be made without departing from the spirit and scope of the invention as defined by the appended claims.

Example 1

For the convenience of understanding the present invention, first, a conventional rectangular wave winding short-distance winding is described with reference to fig. 1, for example, the number Z1 of slots of a motor is 48, the number P of pole pairs is 4, and six layers of rectangular conductors are provided, where the number of layers is not limited to six layers, and the number of layers may be 2N, where N is a positive integer greater than or equal to 1, and N is 1, 2, 3 …. According to the motor winding theory, the motor pole pitch y is Z1/2P 6, the pitch y1 is y 6 when the motor winding is at full pitch, and the pitch y1 < y and y1 is 5 when the motor winding is at short pitch, so that 5 and 7 harmonics of the magnetic field can be weakened. When the general flat wave winding adopts short-distance connection, the pitch of the non-outgoing line end is y1, y1 is smaller than y, and the pitch of the outgoing line end is 2y-y1, so the pitches at the two ends are different.

More specifically, the winding short pitch can attenuate the harmonics of the magnetic field, where the winding pitch y1 is 5, as shown in the schematic connection diagram of the short-pitch winding in fig. 1, unlike the full-pitch winding, where one three five layers, one to six layers of the No. 48 slot, and the second, four, six layers of the No. 2 slot belong to the phase a conductor, the first, three, five layers of the No. 2 slot, one to six layers of the No. 3 slot, and the second, four, six layers of the No. 4 slot belong to the phase C negative sequence, the first, three, five layers of the No. 4 slot, one to six layers of the No. 5 slot, the second, four, six layers of the No. 6 slot belong to the phase B, the first, three, five layers of the No. 6 slot, the first, three, six layers of the No. 7 slot, the second, four, six layers of the No. 8 slot belong to the phase a negative sequence, the first, three, five layers of the No. 9 slot, the first, the second, four, and six layers of the No. 8 slot belong to the phase C, the first, the third, the sixth slot, the first to the second, the third slot, the sixth slot, the second slot, the third slot, the sixth slot, the slot of, The first, third, fifth layer of the No. 12 cell belongs to the negative B-phase sequence, and so on (i.e., in this manner), up to the second, fourth, sixth layer of the No. 48 cell belongs to the negative B-phase sequence. Each phase has two parallel branches. The first branch of phase A is circularly connected with the first layer according to six and five, four and three, two. The connection between the sixth layer and the fifth layer is firstly carried out, an incoming line U1 enters from the sixth layer of the No. 1 slot, crosses to the fifth layer of the No. 6 slot through a short pitch y1 which is 5, enters into the sixth layer of the No. 13 slot through a synthesis pitch 2y-y1 which is 7, crosses to the fifth layer of the No. 18 slot through a pitch y1 which is 5, the synthesis pitch 7 crosses to the sixth layer of the No. 25 slot to circulate, the cycle pitch is 5, 7, 5 and 7, the connection between the six layers and the five layers of conductors is finished, the layers start to be changed when the fifth layer of the No. 42 slot is reached, and the fourth layer of the No. 1 slot is crossed through the synthesis pitch 7; circulating the fourth layer and the third layer from the fourth layer of the No. 1 groove, wherein the circulating pitch is 5, 7, 5, and starting layer change when the third layer of the No. 42 groove is reached, and the fourth layer and the third layer of the No. 1 groove are crossed through the pitch 7; the second layer and the first layer are cycled from the second layer of the No. 1 slot, the cycle pitch is 5, 7, 5, and the layer is changed when the first layer of the No. 42 slot conductor is reached, and the sixth layer of the No. 2 slot is crossed through the pitch 8; and entering another six, five, four, three, two and one layer of circulation, wherein the circulation pitch is also 5, 7, 5, 7 and 5, and finally leading out the line X1 from the first layer of No. 43 groove. The second branch of the phase A and the first branch of the phase A are circularly connected according to a first layer and a second layer, a third layer and a fourth layer, and a fifth layer and a sixth layer. The first layer and the second layer are connected firstly, incoming lines U2 enter from the first layer of the No. 1 groove, the connection of the first layer and the second layer of conductors is completed through

cyclic pitches

5, 7, 5, 7 and 5, layer changing is started, the cyclic connection of the three and four layers of conductors is performed through the pitches 7 to the third layer of the No. 1 groove, and finally, outgoing lines X2 are led out from the sixth layer of the No. 7 groove. And completing the second branch of the phase A. The other B phase and C phase are similar to the above.

According to a preferred embodiment of the present invention, referring to fig. 2 to 6, there is provided a flat copper wire wave-wound armature winding for a three-phase motor, characterized by comprising two parallel branches, the number of slots of each phase of each pole is an even number, the number of layers of the flat copper wire of each slot is an even number, the winding is embedded in the corresponding slot in a wave-wound manner, the pitch of the outgoing line end and the pitch of the non-outgoing line end are equal and are both a first pitch, the conductor coil at the position where the outgoing line end changes layers has a second pitch different from the first pitch, the number of stator slots of the three-phase motor is equal to N, N is equal to or greater than 36, the number of pole pairs is equal to 4, the number of slots of each phase of each pole is 2, the number of layers of the flat copper wires of each slot is 6, and the pole pitch is 6;

wherein, a third five layers of the N-shaped groove, a first to a sixth layers of the 1-shaped groove and a second, a fourth and a sixth layers of the 2-shaped groove belong to A-phase conductors, a first, a third and a fifth layers of the 2-shaped groove, a first to a sixth layers of the 3-shaped groove and a second, a fourth and a sixth layers of the 4-shaped groove belong to C-phase negative sequences, a first, a third and a fifth layers of the 4-shaped groove, a first to a sixth layers of the 5-shaped groove, a second, a fourth and a sixth layers of the 6-shaped groove, a first, a third, a fifth layer of the 6-shaped groove, a first to a sixth layers of the 7-shaped groove, a second, a fourth and a sixth layers of the 8-shaped groove belong to A-phase negative sequences, a first, a third and a fifth layers of the 8-shaped groove, a first to a sixth layers of the 9-shaped groove, a second, a fourth and a sixth layers of the 10-shaped groove belong to C-phase, a first, a third, a fourth and a sixth layers of the 10-shaped groove, a first to sixth layers of the 11-shaped groove, a first, a third and a fourth-phase negative sequences of the 12-shaped groove, and a fourth and a like negative sequences, and a fourth and a sixth layers of the N-shaped groove belong to a negative sequence, and a fourth and a sixth layer of the N-shaped groove belong to a negative sequence;

According to a further preferred embodiment of the present invention, said first pitch is equal to the pole pitch.

According to a further preferred embodiment of the invention, the second pitch is greater than the pole pitch.

According to a further preferred embodiment of the present invention, said first pitch is 6 and said second pitch is 7.

According to a further preferred embodiment of the invention, the two parallel branches of the phases a, B and C are connected in the same way.

According to another preferred embodiment of the present invention, there is also provided a method of winding the aforementioned flat copper wire wave-wound armature winding for a three-phase motor, characterized by comprising the steps of:

the first branch of the phase A is circularly connected with the fifth branch according to the sixth branch, the fourth branch and the third branch, and the second branch and the first branch; the connection of the sixth layer and the fifth layer is firstly carried out, the incoming line U1 enters from the sixth layer of the No. 1 groove, the non-outgoing line end direction directly crosses the fifth layer of the No. 7 groove through the integral pitch y which is 6, the outgoing line end direction also crosses the sixth layer conductor of the No. 13 groove through the integral pitch y which is 6, the fifth layer conductor of the No. 19 groove is crossed through the pitch 6, the sixth layer conductor of the No. 25 groove is crossed through the pitch 6, the fifth layer conductor of the No. 31 groove is crossed through the pitch 6, the circulation is carried out in sequence, the fifth layer conductor of the No. 6, 6 to 43 grooves is crossed through the pitch 6, the layers are required to be changed, the fourth layer conductor of the No. 1 groove is changed through the pitch 6, the circulation connection of the four and three layers of conductors is carried out, the third layer of the No. 6, 6 and 43 grooves is needed to be changed, the layers are changed to the second layer of the No. 1 groove through the pitch 6, the circulation connection of the second and third layer conductors is carried out, and the circulation connection of the second and third layer of the second layer conductors is carried out, and the second layer is carried out, the continuous according to the

pitch

6, 6. 6, 6 to 43 first layers, wherein the layer is required to be changed to the 6 th layer of the No. 2 groove, the circulation connection of six and five layers, four and three layers and two and one layer is continuously carried out according to the pitches of 6, 6 and 6, and finally the outlet end is marked with X1 at the first layer of the No. 44 groove; the phase A second branch is circularly connected with the first layer and the second layer, the third layer and the fourth layer, and the fifth layer and the sixth layer; firstly, connecting a first layer with a second layer, enabling an incoming line U2 to enter from the first layer of a No. 1 groove, completing the connection of a first layer conductor and a second layer conductor through a cyclic pitch of 6, starting layer changing, performing cyclic connection of three and four layers of conductors through the pitch of 6 to the third layer of the No. 1 groove, and finally enabling an outgoing line X2 from the sixth layer of the No. 6 groove; completing a second branch of the phase A; the winding modes of the phase B, the phase C and the phase A are the same.

According to a further preferred embodiment of the present invention, N is equal to 48.

According to yet another preferred embodiment of the invention, N is equal to 72.

According to another preferred embodiment of the invention, there is also provided a flat copper wire wave-wound armature winding for a three-phase motor, which is characterized by comprising two parallel branches, wherein the number of slots of each phase of each pole is even, the number of layers of the flat copper wire of each slot is even, the winding is embedded in the corresponding slot in a wave-wound manner, and the pitch of the outgoing line end and the pitch of the non-outgoing line end are equal and are both the first pitch.

According to a further preferred embodiment of the invention, the conductor coil at the outlet end commutation layer has a second pitch different from the first pitch.

According to a further preferred embodiment of the invention, said first pitch is equal to the pole pitch.

According to another preferred embodiment of the invention, the number of slots of the stator of the three-phase motor is equal to 48, the number of pole pairs is equal to 4, the number of slots per pole per phase is 2, the number of layers of flat copper wires per slot is 6, and the pole pitch is 6.

According to still another preferred embodiment of the present invention, a thirty-five layers of the No. 48 slot, a 1 slot to a six layers and a second, a fourth, a six layers of the No. 2 slot belong to a-phase conductor, a first, a third, a fifth layer of the No. 2 slot, a first to a sixth layer of the No. 3 slot and a second, a fourth, a sixth layer of the No. 4 slot belong to a C-phase negative sequence, a first, a third, a fifth layer of the No. 4 slot, a first to a sixth layer of the No. 5 slot, a second, a fourth, a sixth layer of the No. 6 slot belong to a B-phase, a first, a third, a fifth layer of the No. 6 slot, the first to the sixth layers of the No. 7 groove, the second, the fourth and the sixth layers of the No. 8 groove belong to the A phase negative sequence, the first, the third and the fifth layers of the No. 8 groove, the first to the sixth layers of the No. 9 groove and the second, the fourth and the sixth layers of the No. 10 groove belong to the C phase, the first, the third and the fifth layers of the No. 10 groove, the first to the sixth layers of the No. 11 groove and the first, the third and the fifth layers of the No. 12 groove belong to the B phase negative sequence, and so on, the second, the fourth and the sixth layers of the No. 48 groove belong to the B phase negative sequence.

According to another preferred embodiment of the invention, each phase has two parallel branches, the first branch of phase a being cyclically connected according to six and five, four and three, two and one.

According to another preferred embodiment of the invention, the second branch of phase a is connected cyclically according to one and two, three and four, five and six levels.

According to a further preferred embodiment of the invention, the two parallel branches of phase B and phase C are connected in the same way as the two parallel branches of phase a.

According to another preferred embodiment of the present invention, for example, the number of stator slots Z1 of the three-phase motor is 48, the number of pole pairs P is 4, the number of slots q per pole per phase is 2, the number of layers of flat wire conductors 2N per slot is 6, and the motor pole pitch y is Z1/2P is 6. Star connection, 2 parallel connection.

More specifically, the conductor phase distribution per layer per slot is identical to that of known flat wire short pitch wave windings, but the conductor pitch is different at the outlet end and the non-outlet end. As shown in fig. 2, wherein a thirty-five layers of the No. 48 slot, a 1 slot one to six layers and a second, a fourth, and a sixth layers of the No. 2 slot belong to a phase a conductor, a first, a third, and a fifth layers of the No. 2 slot, a first to a sixth layers of the No. 3 slot and a second, a fourth, and a sixth layers of the No. 4 slot belong to a phase C negative sequence, a first, a third, and a fifth layers of the No. 4 slot, a first to a sixth layers of the No. 5 slot, a second, a fourth, and a sixth layers of the No. 6 slot belong to a phase B, a first, a third, and a fifth layers of the No. 6 slot, the first to the sixth layers of the No. 7 groove, the second, the fourth and the sixth layers of the No. 8 groove belong to the A phase negative sequence, the first, the third and the fifth layers of the No. 8 groove, the first to the sixth layers of the No. 9 groove and the second, the fourth and the sixth layers of the No. 10 groove belong to the C phase, the first, the third and the fifth layers of the No. 10 groove, the first to the sixth layers of the No. 11 groove and the first, the third and the fifth layers of the No. 12 groove belong to the B phase negative sequence, and so on, the second, the fourth and the sixth layers of the No. 48 groove belong to the B phase negative sequence. The connection principle between each layer of conductor layers is similar, each phase is provided with two parallel branches, but the pitch at the moment is a span 6, and the first branch of the A phase is circularly connected according to six and five layers, four and three layers and two and one layer. Firstly, the connection of the sixth layer and the fifth layer is carried out, the incoming line U1 enters from the sixth layer of the No. 1 groove, the non-outgoing line end direction directly crosses to the fifth layer of the No. 7 groove through the integer pitch y which is 6, the outgoing line end direction also crosses to the sixth layer conductor of the No. 13 groove through the integer pitch y which is 6, the fifth layer conductor of the No. 19 groove through the pitch 6, the sixth layer conductor of the No. 25 groove through the pitch 6 and the fifth layer conductor of the No. 31 groove through the pitch 6 circulate in turn, the fifth layer conductor passes through the

pitch

6, 6 to 43 groove, the layers need to be changed at the moment, the fourth layer conductor and the third layer conductor are changed through the

pitch

6, 6 to 43 grooves, the layers need to be changed at the moment, the second layer and the third layer conductor are changed to the second layer and the third layer conductor through the pitch 6, the second layer and the third layer conductor are circularly connected, and the second layer conductor and third layer conductors are continuously connected according to the

pitch

6, 6. 6, 6 to 43 first layers, at this time, the layer is required to be changed to the 6 th layer of the No. 2 groove, the circulation connection of six and five layers, four and three layers and two and one layer is continuously carried out according to the

pitches

6, 6 and 6, and finally, the outlet end is marked with X1 at the first layer of the No. 44 groove. And the phase A second branch is circularly connected according to a first layer and a second layer, a third layer and a fourth layer, and a fifth layer and a sixth layer. The first layer and the second layer are connected, incoming lines U2 enter from the first layer of the No. 1 groove, the first layer and the second layer of conductors are connected through the

cyclic pitches

6, 6 and 6, layer changing is started, the third layer and the fourth layer of conductors are connected in a cyclic mode through the pitches 6 to the third layer of the No. 1 groove, and finally, outgoing lines X2 are led out from the sixth layer of the No. 6 groove. And completing the second branch of the phase A. The other B phase and C phase are similar to the above.

Preferably, when the coil is manufactured, the conductor is made into a hairpin shape according to the pitch 6 of the non-outgoing line ends, and is directly inserted into the slot, such as the hairpin coil shape in fig. 3, the straight line ends of the hairpin coil are respectively bent at the outgoing line ends according to the pitch 6, each coil is welded at the outgoing line ends as shown in fig. 2, each phase only has two conductor coils, the pitch of the three-phase only conductor coils at the outgoing line end during layer changing is 7, and the pitches of all other coils are 6.

Advantageously, compared with a full-pitch winding motor, the invention can weaken magnetic field harmonic waves in principle, so that the counter potential waveform of the motor is more sinusoidal, and the waveform distortion rate is reduced. When the three-phase winding is connected in a star shape, harmonic waves of multiples of 3 and 3 do not exist in the back electromotive force of the wire, and only harmonic frequencies of 5, 7, 11, 13 … … and the like exist, wherein the harmonic waves of 5 and 7 are main harmonic waves, and when the short distance is 5, the harmonic waves of 5 and 7 can be weakened, so that the performance of the motor is improved. Comparison of full-range versus short-range time-line back emf waveforms and waveform distortion rates, as shown in fig. 3-5. Wherein the distortion rate of the whole-range waveform is 3.22%, and the distortion rate of the short-range waveform is 1.8%, which is reduced by 44%.

Furthermore, the pitches of the non-outgoing line end and the outgoing line end of the invention are equal, only six special-shaped conductors are arranged in all the conductors, and the rest conductors are homomorphic conductors, thereby greatly simplifying the coil manufacturing and coil inserting process.

The invention can obtain one or more of the following technical effects:

1. the arrangement mode of even-number layers of flat wire short-distance wave windings is adopted to improve the waveform of the magnetic field of the motor and weaken the harmonic wave of the magnetic field;

2. on the basis of a short-distance winding of a traditional flat wave winding, the pitches of a wire outlet end and a non-wire outlet end are changed and are equal, the coil manufacturing and embedding can be optimized, and meanwhile, each branch circuit is adjusted to comprise conductors in different layers, so that the impedance and the temperature of different branch circuits of the motor are balanced;

4. the coil manufacturing process is simplified, the trouble of complex process manufacturing caused by the diversity of the pitches of the conventional flat wire coil is solved, and errors are avoided.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The flat copper wire wave winding armature winding for the three-phase motor is characterized by comprising two parallel branches, the number of slots of each phase of each pole is even, the number of layers of the flat copper wire of each slot is even, the winding is embedded in the corresponding slot in a wave winding mode, the pitch of a wire outlet end and the pitch of a non-wire outlet end are equal and are both first pitches, a conductor coil at the position of changing layers of the wire outlet end has a second pitch different from the first pitch, the number of stator slots of the three-phase motor is equal to N, the number of N is more than or equal to 36, the number of pole pairs is equal to 4, the number of slots of each phase of each pole is 2, the number of layers of the flat copper wire of each slot is 6, and the pole distance is 6;

2. The flat copper wire wave wound armature winding for a three phase electrical machine of claim 1, wherein the first pitch is equal to a pole pitch.

3. The flat copper wire wave wound armature winding for a three phase electrical machine of claim 2, wherein the second pitch is greater than a pole pitch.

4. The flat copper wire wave wound armature winding for a three phase electric machine of claim 2 or 3, wherein the first pitch is 6 and the second pitch is 7.

5. The flat copper wire wave wound armature winding for a three phase electric machine according to claim 4 wherein the two parallel branches of the A, B and C phases are connected in the same manner.

6. A method of winding the flat copper wire wave wound armature winding for a three phase electric machine of any one of claims 1 to 5, characterized by comprising the steps of:

the first branch of the phase A is circularly connected with the fifth branch according to the sixth branch, the fourth branch and the third branch, and the second branch and the first branch; the connection of the sixth layer and the fifth layer is firstly carried out, the incoming line U1 enters from the sixth layer of the No. 1 groove, the non-outgoing line end direction directly crosses the fifth layer of the No. 7 groove through the integral pitch y which is 6, the outgoing line end direction also crosses the sixth layer conductor of the No. 13 groove through the integral pitch y which is 6, the fifth layer conductor of the No. 19 groove is crossed through the pitch 6, the sixth layer conductor of the No. 25 groove is crossed through the pitch 6, the fifth layer conductor of the No. 31 groove is crossed through the pitch 6, the circulation is carried out in sequence, the fifth layer conductor of the No. 6, 6 to 43 grooves is crossed through the pitch 6, the layers are required to be changed, the fourth layer conductor of the No. 1 groove is changed through the pitch 6, the circulation connection of the four and three layers of conductors is carried out, the third layer of the No. 6, 6 and 43 grooves is needed to be changed, the layers are changed to the second layer of the No. 1 groove through the pitch 6, the circulation connection of the second and third layer conductors is carried out, and the circulation connection of the second and third layer of the second layer conductors is carried out, and the second layer is carried out, the continuous according to the pitch 6, 6. 6, 6 to 43 first layers, wherein the layer is required to be changed to the 6 th layer of the No. 2 groove, the circulation connection of six and five layers, four and three layers and two and one layer is continuously carried out according to the pitches of 6, 6 and 6, and finally the outlet end is marked with X1 at the first layer of the No. 44 groove; the phase A second branch is circularly connected with the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer; firstly, connecting a first layer with a second layer, enabling an incoming line U2 to enter from the first layer of a No. 1 groove, completing the connection of a first layer conductor and a second layer conductor through a cyclic pitch of 6, starting layer changing, performing cyclic connection of three and four layers of conductors through the pitch of 6 to the third layer of the No. 1 groove, and finally enabling an outgoing line X2 from the sixth layer of the No. 6 groove; completing a second branch of the phase A; the winding modes of the phase B, the phase C and the phase A are the same.

7. The method of claim 6, wherein N is equal to 48.

8. The method of claim 6, wherein N is equal to 72.