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

Abstract

A flat copper wire wave-wound armature winding for a three-phase motor is provided, which includes two parallel branches. The number of slots per pole per phase is even, the number of layers of flat copper wire in each slot is even, the winding is embedded in the corresponding slots in a wave-wound manner, and the pitch of the outgoing end and the non-outgoing end are equal and both are the first pitch. This structure uses an even-layer flat wire short-pitch wave winding to improve the magnetic field waveform of the motor, weaken the magnetic field harmonics, the pitch of the outgoing end and the non-outgoing end are equal, which can optimize the coil manufacturing and installation. At the same time, by adjusting each branch to include conductors of different layers, the impedance and temperature of different branches of the motor can be balanced.

Description

Technical Field

[0001] The present invention relates to the field of drive motors for new energy vehicles, and particularly to a flat copper wire wave-wound armature winding for a three-phase motor and a winding method thereof. Background Art

[0002] The known short-pitch winding connection method of the flat wire wave winding, such as the 72-slot 3-pole 4-layer conductor connection method in Patent No. CN2040030773 (the full text of this patent is incorporated herein by reference), is a short-pitch winding used to weaken the 5th and 7th harmonics. The non-outlet end winding is connected with a short pitch of 10, and the pitch of the outlet end is connected with a pitch of 14, and they are connected alternately. The pitches at both ends of the coil are different, and the coil manufacturing and embedding are relatively cumbersome. In addition, Figure 1 The wiring schematic diagram of the six-layer flat wire short-pitch winding in the prior art is shown.

[0003] In addition, in the prior art, when connecting multi-layer conductor flat wire windings, impedance imbalance between different branches is caused due to the position and temperature of the layer where they are located, resulting in performance differences.

[0004] Therefore, it is necessary to study a flat copper wire wave-wound armature winding for a three-phase motor and a winding method thereof to solve one or more of the above technical problems. Summary of the Invention

[0005] To solve the above at least one technical problem, according to one aspect of the present invention, there is provided a flat copper wire wave-wound armature winding for a three-phase motor, which is characterized in that it includes two parallel branches, the number of slots per pole per phase is even, the number of layers of flat copper wire per slot is even, the winding is embedded in the corresponding slot in a wave-wound manner, the pitch of the outlet end is equal to the pitch of the non-outlet end and both are the first pitch, the conductor coil at the layer-changing position of the 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, N is greater than or equal to 36, 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 wire per slot is 6, and the pole pitch is 6;

[0006] Among them, the first, third, and fifth layers of the Nth slot, the first to sixth layers of the 1st slot, and the second, fourth, and sixth layers of the 2nd slot belong to the A-phase conductor, the first, third, and fifth layers of the 2nd slot, the first to sixth layers of the 3rd slot, and the second, fourth, and sixth layers of the 4th slot belong to the negative sequence of the C-phase, the first, third, and fifth layers of the 4th slot, the first to sixth layers of the 5th slot, and the second, fourth, and sixth layers of the 6th slot belong to the B-phase, the first, third, and fifth layers of the 6th slot, the first to sixth layers of the 7th slot, and the second, fourth, and sixth layers of the 8th slot belong to the negative sequence of the A-phase, the first, third, and fifth layers of the 8th slot, the first to sixth layers of the 9th slot, and the second, fourth, and sixth layers of the 10th slot belong to the C-phase, the first, third, and fifth layers of the 10th slot, the first to sixth layers of the 11th slot, and the first, third, and fifth layers of the 12th slot belong to the negative sequence of the B-phase, and so on, until the second, fourth, and sixth layers of the Nth slot belong to the negative sequence of the B-phase;

[0007] Each phase has a first branch and a second branch connected in parallel. The first branch is connected in a cycle of six and five layers, four and three layers, and two and one layer. The second branch is connected in a cycle of one and two, three and four, and five and six layers.

[0008] According to another aspect of the present invention, the first pitch is equal to the pole pitch.

[0009] According to another aspect of the present invention, the second pitch is greater than the pole pitch.

[0010] According to another aspect of the present invention, the first pitch is 6 and the second pitch is 7.

[0011] According to another aspect of the present invention, the connection modes of the two parallel branches of phase A, phase B, and phase C are the same.

[0012] According to another aspect of the present invention, there is also provided a method for winding the flat copper wire wave-wound armature winding for a three-phase motor described above, which is characterized by including the following steps:

[0013] For the first branch of phase A, it is connected in a cycle of six and five layers, four and three layers, and two and one layer; first, connect the sixth layer and the fifth layer. The incoming line U1 enters from the sixth layer of slot 1. The non-outgoing end direction directly crosses to the fifth layer of slot 7 through the full pitch y = 6. The outgoing end direction also crosses to the sixth layer conductor of slot 13 through the full pitch y = 6, then crosses to the fifth layer conductor of slot 19 through the pitch 6, crosses to the sixth layer conductor of slot 25 through the pitch 6, crosses to the fifth layer conductor of slot 31 through the pitch 6, and circulates in turn. Through the pitches 6 and 6, it reaches the fifth layer of slot 43. At this time, a layer change is required. Through the pitch 6, it changes to the fourth layer conductor of slot 1, and connects the fourth and third layer conductors in a cycle. According to the pitches 6, 6, 6, 6, 6, 6, 6, it reaches the third layer of slot 43. At this time, a layer change is required. Through the pitch 6, it changes to the second layer of slot 1, and connects the second and third layer conductors in a cycle. Continue according to the pitches 6, 6, 6, 6, 6, 6, 6 to the first layer of the 43rd layer. At this time, it needs to change to the sixth layer of slot 2. According to the above description, continue to connect in a cycle of six and five layers, four and three layers, and two and one layer according to the pitches 6, 6, 6, 6, 6, 6, 6. Finally, the outgoing end comes out from the first layer of slot 44 and is labeled as X1; for the second branch of phase A, it is connected in a cycle of one and two, three and four, and five and six layers; first, connect the first layer and the second layer. The incoming line U2 enters from the first layer of slot 1. Through the cycle pitches 6, 6, 6, 6, 6, 6, 6, the connection of the first layer and the second layer conductors is completed. Then start to change the layer. Through the pitch 6, it changes to the third layer of slot 1, and connects the third and fourth layer conductors in a cycle. Finally, it exits from the sixth layer of slot 6 as X2; the second branch of phase A is completed; the winding methods of phase B and phase C are the same as that of phase A.

[0014] According to another aspect of the present invention, N is equal to 48.

[0015] According to another aspect of the present invention, N is equal to 72.

[0016] One or more of the following technical effects can be achieved by the present invention:

[0017] 1. By adopting the arrangement of an even-layer flat wire short-pitch wave winding, the magnetic field waveform of the motor is improved and the magnetic field harmonics are weakened.

[0018] 2. On the basis of the traditional flat wire wave winding short-pitch winding, by changing the pitches of the outgoing end and the non-outgoing end and making them equal, the coil manufacturing and embedding can be optimized. At the same time, by adjusting that each branch includes conductors of different layers, the impedance and temperature of different branches of the motor are balanced.

[0019] 3. Solved the inherent defect of large harmonic distortion in the magnetic field or back electromotive force waveform of the motor caused by the full-pitch winding of the current flat wire motor.

[0020] 4. Simplify the coil manufacturing process, solve the trouble of cumbersome process manufacturing caused by the diversification of the pitches of the existing flat wire coils, and avoid mistakes. Description of the Drawings

[0021] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0022] Figure 1 It is a wiring schematic diagram of a six-layer flat wire short-pitch winding in the prior art.

[0023] Figure 2 It is a schematic diagram of a flat copper wire wave-wound armature winding for a three-phase motor according to a preferred embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of a non-outgoing end hairpin coil according to a preferred embodiment of the present invention.

[0025] Figure 4 It is a comparison diagram of the back electromotive force waveforms of full-pitch and short-pitch three-phase lines.

[0026] Figure 5 It is a comparison diagram of the fundamental wave and harmonic amplitudes of the full-pitch winding and the short-pitch winding after Fourier decomposition.

[0027] Figure 6 It is a comparison diagram of the harmonic amplitudes of the full-pitch winding and the short-pitch winding after Fourier decomposition. Specific Embodiments

[0028] The best mode of the present invention will be described below with reference to the drawings through preferred embodiments. The specific embodiments herein are for explaining the present invention in detail and should not be construed as limiting the present invention. Without departing from the spirit and scope of the present invention, various deformations and modifications can be made, and all of them should be included in the protection scope of the present invention.

[0029] Example 1

[0030] To facilitate the understanding of the present invention, first, in combination with Figure 1 the existing flat wire wave winding short-pitch winding will be described. For example, the number of stator slots of the motor Z1 = 48, the number of pole pairs P = 4, and six layers of flat wire conductors. The number of layers is not limited to six layers and can be 2N, where N is a positive integer greater than or equal to 1, N = 1, 2, 3,.... According to the motor winding theory, the pole pitch of the motor y = Z1 / 2P = 6. When the motor winding is a full pitch, the pitch y1 = y = 6. When the motor winding is a short pitch, the pitch y1 < y, and y1 = 5 can be taken. At this time, the 5th and 7th harmonics of the magnetic field can be weakened. Generally, when the flat wire wave winding adopts a short-pitch connection, the pitch of the non-outlet end is y1, y1 is less than y, and the pitch of the outlet end is 2y - y1, so the pitches at both ends are not equal.

[0031] More specifically, the winding short pitch can weaken the harmonics of the magnetic field. At this time, the winding pitch y1 = 5, as Figure 1Schematic diagram of the short-pitch winding connection. Different from the full-pitch winding, the first, third, and fifth layers of slot No. 48, the first to sixth layers of slot No. 1, and the second, fourth, and sixth layers of slot No. 2 belong to the A-phase conductors. The first, third, and fifth layers of slot No. 2, the first to sixth layers of slot No. 3, and the second, fourth, and sixth layers of slot No. 4 belong to the negative sequence of the C-phase. The first, third, and fifth layers of slot No. 4, the first to sixth layers of slot No. 5, and the second, fourth, and sixth layers of slot No. 6 belong to the B-phase. The first, third, and fifth layers of slot No. 6, the first to sixth layers of slot No. 7, and the second, fourth, and sixth layers of slot No. 8 belong to the negative sequence of the A-phase. The first, third, and fifth layers of slot No. 8, the first to sixth layers of slot No. 9, and the second, fourth, and sixth layers of slot No. 10 belong to the C-phase. The first, third, and fifth layers of slot No. 10, the first to sixth layers of slot No. 11, and the first, third, and fifth layers of slot No. 12 belong to the negative sequence of the B-phase, and so on (i.e., in this way), until the second, fourth, and sixth layers of slot No. 48 belong to the negative sequence of the B-phase. Each phase has two parallel branches. For the first branch of the A-phase, it is connected in a cycle of six and five, four and three, two and one layers. First, connect the sixth layer and the fifth layer. The incoming line U1 enters from the sixth layer of slot No. 1, crosses the short-pitch y1 = 5 to the fifth layer of slot No. 6, passes through the synthetic pitch 2y - y1 = 7 to the sixth layer of slot No. 13, crosses the pitch y1 = 5 to the fifth layer of slot No. 18, and the synthetic pitch 7 to the sixth layer of slot No. 25 for cycling. The cycling pitch is 5, 7, 5, 7, 5, 7. After connecting the sixth and fifth layer conductors, when reaching the fifth layer conductor of slot No. 42, start changing layers, and cross to the fourth layer of slot No. 1 through the synthetic pitch 7; start the cycle of the fourth and third layers from the fourth layer of slot No. 1, and the cycling pitch is 5, 7, 5, 7, 5, 7, 5 until starting to change layers when reaching the third layer conductor of slot No. 42, and cross to the second layer of slot No. 1 through the pitch 7; start the cycle of the second and first layers from the second layer of slot No. 1, and the cycling pitch is 5, 7, 5, 7, 5, 7, 5 until starting to change layers when reaching the first layer conductor of slot No. 42, and cross to the sixth layer of slot No. 2 through the pitch 8; enter another cycle of six, five, four, three, two, one layers, and the cycling pitch is also 5, 7, 5, 7, 5, 7, 5. Finally, the outgoing line X1 comes out from the first layer of slot No. 43. For the second branch of the A-phase, it is connected in a cycle of one and two, three and four, five and six layers. First, connect the first layer and the second layer. The incoming line U2 enters from the first layer of slot No. 1, and completes the connection of the first and second layer conductors through the cycling pitch 5, 7, 5, 7, 5, 7, 5. Then start changing layers, cross to the third layer of slot No. 1 through the pitch 7, and conduct the cycle connection of the third and fourth layer conductors. Finally, the outgoing line X2 comes out from the sixth layer of slot No. 7. The second branch of the A-phase is completed. The other B-phase and C-phase are similar to this.

[0032] According to a preferred embodiment of the present invention, refer to Figures 2 - 6, a flat copper wire wave-wound armature winding for a three-phase motor is provided, which is characterized in that it includes two parallel branches, the number of slots per pole per phase is even, the number of layers of flat copper wire in each slot is even, the winding is embedded in the corresponding slots in a wave-wound manner, the pitch of the outgoing end and the non-outgoing end pitch are equal and both are the first pitch, and the conductor coil at the layer-changing position of the outgoing end 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 greater than or equal to 36, 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 wire in each slot is 6, and the pole pitch is 6;

[0033] Among them, the first, third, and fifth layers of the Nth slot, the first to sixth layers of the 1st slot, and the second, fourth, and sixth layers of the 2nd slot belong to the A-phase conductor. The first, third, and fifth layers of the 2nd slot, the first to sixth layers of the 3rd slot, and the second, fourth, and sixth layers of the 4th slot belong to the negative sequence of the C-phase. The first, third, and fifth layers of the 4th slot, the first to sixth layers of the 5th slot, and the second, fourth, and sixth layers of the 6th slot belong to the B-phase. The first, third, and fifth layers of the 6th slot, the first to sixth layers of the 7th slot, and the second, fourth, and sixth layers of the 8th slot belong to the negative sequence of the A-phase. The first, third, and fifth layers of the 8th slot, the first to sixth layers of the 9th slot, and the second, fourth, and sixth layers of the 10th slot belong to the C-phase. The first, third, and fifth layers of the 10th slot, the first to sixth layers of the 11th slot, and the first, third, and fifth layers of the 12th slot belong to the negative sequence of the B-phase, and so on, until the second, fourth, and sixth layers of the Nth slot belong to the negative sequence of the B-phase;

[0034] Each phase has a first branch and a second branch connected in parallel. The first branch is connected in a cycle of six and five layers, four and three layers, two and one layer, and the second branch is connected in a cycle of one and two, three and four, five and six layers.

[0035] According to another preferred embodiment of the present invention, the first pitch is equal to the pole pitch.

[0036] According to another preferred embodiment of the present invention, the second pitch is greater than the pole pitch.

[0037] According to another preferred embodiment of the present invention, the first pitch is 6 and the second pitch is 7.

[0038] According to another preferred embodiment of the present invention, the connection methods of the two parallel branches of the A-phase, B-phase, and C-phase are the same.

[0039] According to another preferred embodiment of the present invention, a method for winding the aforementioned flat copper wire wave-wound armature winding for a three-phase motor is also provided, which is characterized by including the following steps:

[0040] The first branch of phase A is connected in a cycle of six and five layers, four and three layers, two and one layer; first, connect the sixth layer and the fifth layer. The incoming line U1 enters from the sixth layer of slot 1. The non-outlet end direction directly crosses to the fifth layer of slot 7 through the integral pitch y = 6. The outlet end direction also crosses to the sixth layer conductor of slot 13 through the integral pitch y = 6, then crosses to the fifth layer conductor of slot 19 through a pitch of 6, crosses to the sixth layer conductor of slot 25 through a pitch of 6, crosses to the fifth layer conductor of slot 31 through a pitch of 6, and so on in a cycle. Through pitches of 6 and 6, it reaches the fifth layer of slot 43. At this time, a layer change is required. It changes to the fourth layer conductor of slot 1 through a pitch of 6 and conducts the cyclic connection of the fourth and third layer conductors. According to pitches of 6, 6, 6, 6, 6, 6, 6, it reaches the third layer of slot 43. At this time, a layer change is required. It changes to the second layer of slot 1 through a pitch of 6 and conducts the cyclic connection of the second and third layer conductors. Continuing according to pitches of 6, 6, 6, 6, 6, 6, 6, it reaches the first layer of slot 43. At this time, it needs to change to the sixth layer of slot 2. According to the above description, continue to connect in a cycle of six and five layers, four and three layers, two and one layer according to pitches of 6, 6, 6, 6, 6, 6, 6. Finally, the outlet end comes out from the first layer of slot 44 and is labeled X1; The second branch of phase A is connected in a cycle of one and two, three and four, five and six layers; first, connect the first layer and the second layer. The incoming line U2 enters from the first layer of slot 1. Through cyclic pitches of 6, 6, 6, 6, 6, 6, 6, the connection of the first layer and the second layer conductors is completed. Then, a layer change starts. It reaches the third layer of slot 1 through a pitch of 6 and conducts the cyclic connection of the third and fourth layer conductors. Finally, it exits from the sixth layer of slot 6 as X2; The second branch of phase A is completed; The winding methods of phase B and phase C are the same as that of phase A.

[0041] According to another preferred embodiment of the present invention, N is equal to 48.

[0042] According to another preferred embodiment of the present invention, N is equal to 72.

[0043] According to another preferred embodiment of the present invention, there is also provided a flat copper wire wave-wound armature winding for a three-phase motor, which is characterized in that it includes two parallel branches, the number of slots per pole per phase is an even number, the number of layers of flat copper wire per slot is an even number, the winding is embedded in the corresponding slots in a wave-wound manner, and the pitch of the outlet end and the pitch of the non-outlet end are equal and both are the first pitch.

[0044] According to another preferred embodiment of the present invention, the conductor coil at the layer change position of the outlet end has a second pitch different from the first pitch.

[0045] According to another preferred embodiment of the present invention, the first pitch is equal to the pole pitch.

[0046] According to another preferred embodiment of the present invention, the second pitch is greater than the pole pitch.

[0047] According to another preferred embodiment of the present invention, the number of stator slots 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.

[0048] According to another preferred embodiment of the present invention, the first, third, and fifth layers of slot No. 48, the first to sixth layers of slot No. 1, and the second, fourth, and sixth layers of slot No. 2 belong to the A-phase conductor. The first, third, and fifth layers of slot No. 2, the first to sixth layers of slot No. 3, and the second, fourth, and sixth layers of slot No. 4 belong to the negative sequence of the C phase. The first, third, and fifth layers of slot No. 4, the first to sixth layers of slot No. 5, and the second, fourth, and sixth layers of slot No. 6 belong to the B phase. The first, third, and fifth layers of slot No. 6, the first to sixth layers of slot No. 7, and the second, fourth, and sixth layers of slot No. 8 belong to the negative sequence of the A phase. The first, third, and fifth layers of slot No. 8, the first to sixth layers of slot No. 9, and the second, fourth, and sixth layers of slot No. 10 belong to the C phase. The first, third, and fifth layers of slot No. 10, the first to sixth layers of slot No. 11, and the first, third, and fifth layers of slot No. 12 belong to the negative sequence of the B phase, and so on, until the second, fourth, and sixth layers of slot No. 48 belong to the negative sequence of the B phase.

[0049] According to another preferred embodiment of the present invention, the first pitch is 6 and the second pitch is 7.

[0050] According to another preferred embodiment of the present invention, each phase has two parallel branches. The first branch of the A phase is connected in a cycle of six and five layers, four and three layers, and two and one layer.

[0051] According to another preferred embodiment of the present invention, the second branch of the A phase is connected in a cycle of one and two, three and four, and five and six layers.

[0052] According to another preferred embodiment of the present invention, the connection modes of the two parallel branches of the B phase and the C phase are the same as those of the two parallel branches of the A phase.

[0053] According to another preferred embodiment of the present invention, for example, the number of stator slots of the three-phase motor Z1 = 48, the number of pole pairs P = 4, the number of slots per pole per phase q = 2, the number of layers of flat wire conductors per slot 2N = 6, and the pole pitch of the motor y = Z1 / 2P = 6. Star connection, 2-way parallel connection.

[0054] More specifically, the phase distribution of each conductor layer per slot is consistent with that of the known flat wire short-pitch wave winding, but the conductor pitches at the outgoing end and the non-outgoing end are different. As Figure 2As shown, the first, third, and fifth layers of slot No. 48, the first to sixth layers of slot No. 1, and the second, fourth, and sixth layers of slot No. 2 belong to the A-phase conductor. The first, third, and fifth layers of slot No. 2, the first to sixth layers of slot No. 3, and the second, fourth, and sixth layers of slot No. 4 belong to the negative sequence of the C-phase. The first, third, and fifth layers of slot No. 4, the first to sixth layers of slot No. 5, and the second, fourth, and sixth layers of slot No. 6 belong to the B-phase. The first, third, and fifth layers of slot No. 6, the first to sixth layers of slot No. 7, and the second, fourth, and sixth layers of slot No. 8 belong to the negative sequence of the A-phase. The first, third, and fifth layers of slot No. 8, the first to sixth layers of slot No. 9, and the second, fourth, and sixth layers of slot No. 10 belong to the C-phase. The first, third, and fifth layers of slot No. 10, the first to sixth layers of slot No. 11, and the first, third, and fifth layers of slot No. 12 belong to the negative sequence of the B-phase, and so on, until the second, fourth, and sixth layers of slot No. 48 belong to the negative sequence of the B-phase. The connection principle between each layer of the conductor is similar. Each phase has two parallel branches, but the pitch at this time is the integral pitch span of 6. For the first branch of the A-phase, it is connected in a cycle of six and five layers, four and three layers, and two and one layer. First, connect the sixth layer and the fifth layer. The incoming line U1 enters from the sixth layer of slot No. 1. The non-outgoing end direction directly crosses to the fifth layer of slot No. 7 through the integral pitch y = 6. The outgoing end direction also crosses to the sixth layer conductor of slot No. 13 through the integral pitch y = 6, crosses to the fifth layer conductor of slot No. 19 through the pitch of 6, crosses to the sixth layer conductor of slot No. 25 through the pitch of 6, crosses to the fifth layer conductor of slot No. 31 through the pitch of 6, and circulates in turn. After passing through the pitches of 6 and 6 to the fifth layer of slot No. 43, at this time, a layer change is required. Cross to the fourth layer conductor of slot No. 1 through the pitch of 6, and perform the cyclic connection of the fourth and third layer conductors. According to the pitches of 6, 6, 6, 6, 6, 6, 6 to the third layer of slot No. 43. At this time, a layer change is required. Cross to the second layer of slot No. 1 through the pitch of 6, and perform the cyclic connection of the second and third layer conductors. Continue according to the pitches of 6, 6, 6, 6, 6, 6, 6 to the first layer of the 43rd layer. At this time, a layer change is required to the sixth layer of slot No. 2. According to the above description, continue to perform the cyclic connection of six and five layers, four and three layers, and two and one layer according to the pitch of 6, 6, 6, 6, 6, 6, 6. Finally, the outgoing end comes out from the first layer of slot No. 44 and is labeled X1. For the second branch of the A-phase, it is connected in a cycle of one and two, three and four, and five and six layers. First, connect the first layer and the second layer. The incoming line U2 enters from the first layer of slot No. 1. After completing the connection of the first and second layer conductors through the cyclic pitches of 6, 6, 6, 6, 6, 6, 6, start to change layers. Cross to the third layer of slot No. 1 through the pitch of 6, and perform the cyclic connection of the third and fourth layer conductors. Finally, the outgoing line comes out from the sixth layer of slot No. 6 as X2. The second branch of the A-phase is completed. The other B-phase and C-phase are similar to this.

[0055] Preferably, when making the coil, first make the conductor into a hairpin shape with a non-outgoing end pitch of 6 and directly insert it into the slot, such as Figure 3 the hairpin coil shape. At the outgoing end, bend the straight ends of the hairpin coils according to the pitch of 6 respectively, and weld each coil at the outgoing end as Figure 2As shown, there are only two conductor coils per phase, and the pitch of the conductor coils in the three phases is 7 when changing layers at the outgoing end, and the pitch of all other coils is 6.

[0056] Advantageously, compared with the full-pitch winding motor, the present invention can weaken the magnetic field harmonics in principle, make the back electromotive force waveform of the motor more sinusoidal, and reduce the waveform distortion rate. When the three-phase winding is connected in star, there are no 3 and multiples of 3 harmonics in the line back electromotive force, only harmonic orders such as 5, 7, 11, 13... Among them, the 5th and 7th harmonics are the main harmonics. When the short pitch is taken as 5, the 5th and 7th harmonics can be weakened, thereby improving the performance of the motor. As Figures 3 - 5 shown, the comparison of the line back electromotive force waveforms and waveform distortion rates at full pitch and short pitch. Among them, the waveform distortion rate at full pitch is 3.22%, and the waveform distortion rate at short pitch is 1.8%, a reduction of 44%.

[0057] Furthermore, the pitch of the non-outgoing end and the outgoing end of the present invention is equal, and there are only six special-shaped conductors among all the conductors, and the rest are of the same shape, greatly simplifying the coil manufacturing and winding process.

[0058] The present invention can obtain one or more of the following technical effects:

[0059] 1. Adopting the arrangement of even-layer flat wire short pitch wave windings to improve the motor magnetic field waveform and weaken the magnetic field harmonics;

[0060] 2. On the basis of the traditional flat wire wave winding short pitch winding, changing the pitch of the outgoing end and the non-outgoing end and making them equal can optimize the coil manufacturing and installation, and at the same time adjust each branch to include conductors of different layers, so that the impedance and temperature of different branches of the motor are balanced;

[0061] 3. Solving the inherent defect of large harmonic distortion of the motor magnetic field or back electromotive force waveform caused by the full pitch winding of the current flat wire motor;

[0062] 4. Simplifying the coil manufacturing process, solving the trouble of cumbersome process manufacturing caused by the diversification of the pitch of the existing flat wire coils, and avoiding mistakes.

[0063] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A flat copper wire wave-wound armature winding for a three-phase motor, characterized in that It includes two parallel branches. The number of slots per pole per phase is even, the number of layers of flat copper wires in each slot is even, the winding is embedded in the corresponding slots in a wave winding manner, the pitch of the outgoing end and the non-outgoing end are equal and both are the first pitch, and the conductor coil at the layer-changing position of the outgoing end 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 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 in each slot is 6, and the pole pitch is 6; Among them, the first, third, and fifth layers of slot N, the first to sixth layers of slot 1, and the second, fourth, and sixth layers of slot 2 belong to the A-phase conductor. The first, third, and fifth layers of slot 2, the first to sixth layers of slot 3, and the second, fourth, and sixth layers of slot 4 belong to the negative sequence of the C phase. The first, third, and fifth layers of slot 4, the first to sixth layers of slot 5, and the second, fourth, and sixth layers of slot 6 belong to the B phase. The first, third, and fifth layers of slot 6, the first to sixth layers of slot 7, and the second, fourth, and sixth layers of slot 8 belong to the negative sequence of the A phase. The first, third, and fifth layers of slot 8, the first to sixth layers of slot 9, and the second, fourth, and sixth layers of slot 10 belong to the C phase. The first, third, and fifth layers of slot 10, the first to sixth layers of slot 11, and the first, third, and fifth layers of slot 12 belong to the negative sequence of the B phase, and so on, until the second, fourth, and sixth layers of slot N belong to the negative sequence of the B phase; Each phase has a first branch and a second branch connected in parallel. The first branch is connected in a cycle of six and five layers, four and three layers, two and one layer, and the second branch is connected in a cycle of one and two, three and four, five and six layers.

2. A method for winding the flat copper wire wave-wound armature winding for a three-phase motor described in claim 1, characterized in that It includes the following steps: The first branch of phase A is connected in a cycle of six and five layers, four and three layers, and two and one layer; first, connect the sixth layer and the fifth layer. The incoming line U1 enters from the sixth layer of slot 1. The non-outgoing end directly crosses to the fifth layer of slot 7 through the full pitch y = 6. The outgoing end also crosses to the sixth layer conductor of slot 13 through the full pitch y = 6, then crosses to the fifth layer conductor of slot 19 through a pitch of 6, crosses to the sixth layer conductor of slot 25 through a pitch of 6, crosses to the fifth layer conductor of slot 31 through a pitch of 6, and cycles in turn. After pitches of 6 and 6, it reaches the fifth layer of slot 43. At this time, a layer change is required. It changes to the fourth layer conductor of slot 1 through a pitch of 6 and connects the conductors of the fourth and third layers in a cycle. According to pitches of 6, 6, 6, 6, 6, 6, and 6, it reaches the third layer of slot 43. At this time, a layer change is required. It changes to the second layer of slot 1 through a pitch of 6 and connects the conductors of the second and third layers in a cycle. It continues to connect according to pitches of 6, 6, 6, 6, 6, 6, and 6 to the first layer of slot 43. At this time, it needs to change to the sixth layer of slot 2. According to the above description, it continues to connect in a cycle of six and five layers, four and three layers, and two and one layer according to pitches of 6, 6, 6, 6, 6, 6, and 6. Finally, the outgoing end comes out from the first layer of slot 44 and is labeled X1; the second branch of phase A is connected in a cycle of one and two, three and four, and five and six layers; first, connect the first layer and the second layer. The incoming line U2 enters from the first layer of slot 1. After completing the connection of the conductors of the first and second layers through cycle pitches of 6, 6, 6, 6, 6, 6, and 6, a layer change starts. It changes to the third layer of slot 1 through a pitch of 6 and connects the conductors of the third and fourth layers in a cycle. Finally, it exits from the sixth layer of slot 6 as X2; the second branch of phase A is completed; the winding methods of phase B and phase C are the same as that of phase A.

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