Balanced winding flat wire motor with reduced slot voltage drop and armature winding winding method

Abstract

The present invention discloses a balanced winding flat wire motor for reducing slot voltage drop, comprising an armature core and an armature winding wound on the armature core, wherein the armature winding is a three-phase winding, wherein each pole and each phase on the armature core respectively correspond to Q phase slots, each phase winding has a plurality of branches, each branch is composed of a plurality of branch units, each branch unit respectively corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, and the branch unit comprises at least a forward coil and a reverse coil; the forward coil is wound on the armature core portion between the phase slot R1 and the phase slot R2 in a forward spiral manner; the reverse coil is wound on the armature core portion between the phase slot R2 and the phase slot R3 in a reverse spiral manner, and the forward coil and the reverse coil are connected in series. The present invention realizes that the number of layers and the slot phase of the paths of the same-phase different branch windings are unified, and balance is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of flat wire motors, and in particular relates to a balanced winding flat wire motor capable of reducing slot voltage drop and a winding method for an armature winding. Background Art

[0002] In order to further improve the power density of motor products and reduce the material cost of products; however, after the motor winding adopts the flat wire design, the inductance of the wires in different layers and slots is different. Under the same rotor rotation excitation, the induced back electromotive force phase is different. If the isolation winding of the same phase has different layers and phase slots of the conductors that make up the branch windings of the same phase, it will cause the motor winding branches to be unbalanced. As the speed or working voltage of the motor increases, the current magnitude and phase in different branches will be different, and internal circulation will be generated, greatly increasing the internal loss of the motor. In addition, the motor conductor is mainly made of enameled wire material, and the enameled wire material generally has pinholes or insulation damage during production and use. As the voltage of the motor product increases, the withstand voltage between the enameled wires is difficult to meet the use requirements. Therefore, when designing the flat wire conductor winding, it is necessary to ensure the balance of the winding, and at the same time design a lower voltage drop between the conductors in the same slot to effectively reduce the risk of insulation breakdown in the slot. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for winding a balanced winding flat wire motor and an armature winding that reduces slot voltage drop in response to the deficiencies in the above-mentioned prior art. Through a special overlapping winding and wave winding combined connection method of the winding, the number of layers and slot phases of the paths of different branch windings of the same phase are unified to achieve balance.

[0004] The first aspect of the present invention discloses a balanced winding flat wire motor for reducing slot voltage drop, comprising an armature core and an armature winding wound on the armature core, wherein the armature winding is a three-phase winding, comprising a U-phase winding, a V-phase winding and a W-phase winding, the number of pole pairs is p, and each pole and each phase of the U-phase winding, the V-phase winding and the W-phase winding on the armature core respectively correspond to Q phase slots, p≥Q, each phase winding has a plurality of branches, each branch is composed of a plurality of branch units, each branch unit respectively corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, the phase slot R1 and the phase slot R2 belong to two phase slots under the same phase and adjacent poles; the phase slot R2 and the phase slot R3 belong to two phase slots under the same phase and adjacent poles;

[0005] The branch unit includes at least one forward coil and one reverse coil; the forward coil is wound on the armature core part between the phase slot R1 and the phase slot R2 in a forward spiral manner; the reverse coil is wound on the armature core part between the phase slot R2 and the phase slot R3 in a reverse spiral manner, and the forward coil and the reverse coil are connected in series.

[0006] The above-mentioned balanced winding flat wire motor with reduced slot voltage drop belongs to a plurality of branch units in the same branch connected in series.

[0007] In the above-mentioned balanced winding flat wire motor with reduced slot voltage drop, the phase slot is divided into L1-Lm layers from the slot bottom to the slot mouth, and the L1 layer is the layer closest to the slot mouth; the series connection of the forward coil and the reverse coil is located on the virtual cylindrical surface where the Lm layer or L1 layer of the phase slot is located.

[0008] In the above-mentioned balanced winding flat wire motor with reduced slot voltage drop, the head ends of two adjacent branches belonging to the same phase are respectively located in the first phase slots belonging to the same phase under two adjacent pole pairs.

[0009] In the above-mentioned balanced winding flat wire motor with reduced slot voltage drop, each phase winding can be divided into an inner winding part close to the inner ring of the armature core and an outer winding part, and the cross-line distance of the inner winding part and the outer winding part is the same.

[0010] The second aspect of the present invention discloses a method for winding an armature winding of a flat wire motor, wherein the armature winding is a three-phase winding, including a U-phase winding, a V-phase winding and a W-phase winding, the number of pole pairs is p, and each pole and each phase of the U-phase winding, the V-phase winding and the W-phase winding on the armature core respectively correspond to Q phase slots, p≥Q, and the phase slots are divided into L1-Lm layers from the bottom of the slot to the slot mouth, and the L1 layer is the layer closest to the slot mouth; each phase winding has multiple branches, and each branch is formed by connecting multiple branch units in series, characterized in that each branch unit includes a forward coil and a reverse coil, and each branch unit corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, and the phase slot R1 and the phase slot R2 belong to the same phase and two phase slots under adjacent poles; the phase slot R2 and the phase slot R3 belong to the same phase and two phase slots under adjacent poles;

[0011] The forward coil is wound in a forward spiral manner on the armature core portion between the phase slot R1 and the phase slot R2, wherein the straight conductor of the forward coil in the phase slot R1 is located in all odd-numbered layers of the L1-Lm layer, and the straight conductor of the forward coil in the phase slot R2 is located in all even-numbered layers of the L1-Lm layer, and the threading end of the forward coil enters from the L1 layer of the phase slot R1 and finally passes through the Lm layer of the phase slot R2; the reverse coil is wound in a reverse spiral manner on the armature core portion between the phase slot R2 and the phase slot R3, wherein the straight conductor of the forward coil in the phase slot R2 is located in all odd-numbered layers of the L1-Lm layer, and the straight conductor of the forward coil in the phase slot R3 is located in all even-numbered layers of the L1-Lm layer, and the threading end of the reverse coil enters from the Lm layer of the phase slot R3 and finally passes through the L1 layer of the phase slot R2;

[0012] The head end of the forward coil passing through the Lm layer of the phase slot R2 and the end of the reverse coil outside the Lm layer of the phase slot R3 are connected in series.

[0013] In the above-mentioned method for winding the armature winding of the flat wire motor, in the same branch, two branch units connected in series, the threading end of the reverse coil of one branch unit passing through the L1 layer of the phase slot R2 is connected in series with the end of the forward coil of the next branch unit in the same branch in the L1 layer of another phase slot R1.

[0014] The above-mentioned method for winding the armature winding of the flat wire motor belongs to two adjacent branches of the same phase. When one branch is wound, the phase slot R1 of the first branch unit of the branch and the phase slot R1 of the first branch unit of another wound branch are respectively located under two adjacent pole pairs.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention realizes the unification of the number of layers and slot phases of the paths of the same-phase different branch windings through a special overlapping winding and wave winding combined connection method, thereby achieving balance; in addition, the winding head end of each branch and the winding end of other or self-generated branches are not in the same slot, and the voltage between different conductors in the same slot is reduced to a smaller order of magnitude.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a branch winding of the present invention.

[0018] Figure 2 This is an expanded view of the first branch winding and the second branch winding of the present invention.

[0019] Figure 3 This is an expanded view of the third branch winding and the fourth branch winding of the present invention.

[0020] Figure 4 This is an expanded view of a single phase winding of the present invention. DETAILED DESCRIPTION

[0021] A balanced winding flat wire motor for reducing slot voltage drop comprises an armature core and an armature winding wound on the armature core, wherein the armature winding is a three-phase winding, comprising a U-phase winding, a V-phase winding and a W-phase winding, the number of pole pairs is p, and each pole and each phase of the U-phase winding, the V-phase winding and the W-phase winding on the armature core respectively correspond to Q phase slots, p≥Q, and each phase winding has multiple branches; Figure 1 — Figure 4 As shown, in this embodiment, the number of pole pairs p=4, Q=3, and there are a total of 72 slots on the armature core.

[0022] In this embodiment, each branch is composed of a plurality of branch units, each branch unit corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, the phase slot R1 and the phase slot R2 belong to the same phase and are two phase slots under adjacent poles; the phase slot R2 and the phase slot R3 belong to the same phase and are two phase slots under adjacent poles;

[0023] It should be noted that the branch unit refers to the branch part corresponding to a pole pair, such as Figure 1 As shown, a phase winding lower branch is composed of three branch units; the branch unit includes at least a forward coil and a reverse coil; the forward coil is wound on the armature core part between the phase slot R1 and the phase slot R2 in a forward spiral manner; the reverse coil is wound on the armature core part between the phase slot R2 and the phase slot R3 in a reverse spiral manner, and the forward coil and the reverse coil are connected in series.

[0024] It should be noted that Figure 2 Take the first branch unit in as an example, the phase slot R1 corresponding to this branch unit is the 1st slot, the phase slot R2 is the 10th slot, and the phase slot R3 is the 19th slot. The phase slot is divided into L1-Lm layers from the bottom of the slot to the slot mouth, and the L1 layer is the layer closest to the slot mouth. In this embodiment, Lm=L6; when the forward coil is wound, it enters one pole side of the armature from the L1 layer of the 1st slot, and then connects to the L2 layer of the 1st slot of the adjacent pole side, and then returns to the L3 layer of the 1st slot, and then enters the L4 layer in the same direction as the L1 layer. If this is like winding until it enters the Lm layer of the 10th slot, the arrangement of the forward coil is completed. The reverse coil is arranged in the opposite polarity direction to the forward coil, and enters from the Lm layer of the 19th slot, and then winds back to the L(m-1) layer of the 10th slot, and the winding is arranged in the opposite direction of the forward coil until it returns to the L1 layer of the 10th slot, completing the arrangement of the reverse coil. Coil 1 and coil 2 form a pole-to-pole arrangement of the branch winding 1. The lead wire of the forward coil led out from the Lm layer of the 10th slot is connected in series with the reverse coil of the Lm layer of the 19th slot.

[0025] In this embodiment, multiple branch units belonging to the same branch are connected in series. Here, one branch consists of three branch units. Figure 1 As shown in the figure, Y1, Y2, Y3, and Y4 are the starting ends of the four branches, and X1, X2, X3, and X4 are the ends of the four branches. Figure 2 Taking the series connection of the first branch unit and the second branch unit in the circuit as an example, the lead wire of the reverse coil led out from the L1 layer of the 10th slot is connected to the forward coil of another branch unit of the L1 layer of the 20th slot.

[0026] The series connection of the forward coil and the reverse coil is located on a virtual cylindrical surface where the Lm layer or the L1 layer of the phase slot is located.

[0027] From the above, it can be seen that the connection layer of adjacent coils is either in the L1 layer or in the Lm layer, and the entire branch passes through the arrangement of different slots under different poles.

[0028] In this embodiment, the head ends of two adjacent branches belonging to the same phase are respectively located in the first phase slots belonging to the same phase under two adjacent pole pairs. Figure 3 As shown in the figure, when the head end of the first branch is at the 1st slot, the head end of the second branch is at the 19th slot.

[0029] It should be noted that after the winding of each branch is completed, the layers and phase slots of each branch are exactly the same, which ensures that the branches of the same phase winding are completely balanced. Since the head ends of two adjacent branches are located under the same phase slots of an adjacent pair of poles, the maximum voltage drop in the slot at the input end of each branch can be calculated based on the schematic diagram to be only 1 / Q of the phase voltage.

[0030] In this embodiment, each phase winding can be divided into an inner winding part and an outer winding part close to the inner ring of the armature core, and the cross-line distance of the inner winding part and the outer winding part is the same. In this way, the number of types of single-layer coil elements (U-shaped wires) of the entire winding is equal to the number of layers m / 2+1, the number of types is the least, and it is most conducive to the winding arrangement.

[0031] In another embodiment of the present invention, a method for winding an armature winding of a flat wire motor is provided, wherein the armature winding is a three-phase winding, including a U-phase winding, a V-phase winding and a W-phase winding, the number of pole pairs is p, and each pole and each phase of the U-phase winding, the V-phase winding and the W-phase winding on the armature core respectively correspond to Q phase slots, p≥Q, and the phase slots are divided into L1-Lm layers from the bottom of the slot to the slot mouth, and the L1 layer is the layer closest to the slot mouth; each phase winding has multiple branches, and each branch is formed by a plurality of branch units connected in series, each branch unit includes a forward coil and a reverse coil, and each branch unit corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, and the phase slot R1 and the phase slot R2 belong to the same phase and two phase slots under adjacent poles; the phase slot R2 and the phase slot R3 belong to the same phase and two phase slots under adjacent poles;

[0032] by Figure 2 Taking the first branch unit in as an example, the phase slot R1 corresponding to this branch unit is the 1st slot, the phase slot R2 is the 10th slot, and the phase slot R3 is the 19th slot.

[0033] The forward coil is wound in a forward spiral manner on the armature core portion between the phase slot R1 and the phase slot R2, wherein the straight conductor of the forward coil in the phase slot R1 is located in all odd layers of the L1-Lm layer, and the straight conductor of the forward coil in the phase slot R2 is located in all even layers of the L1-Lm layer, and the threading end of the forward coil enters from the L1 layer of the phase slot R1 and finally passes out from the Lm layer of the phase slot R2; the reverse coil is wound in a reverse spiral manner on the armature core portion between the phase slot R2 and the phase slot R3, wherein the straight conductor of the forward coil in the phase slot R2 is located in all odd layers of the L1-Lm layer, and the straight conductor of the forward coil in the phase slot R3 is located in all even layers of the L1-Lm layer, and the threading end of the reverse coil enters from the Lm layer of the phase slot R3 and finally passes out from the L1 layer of the phase slot R2; in this embodiment, Lm=L6.

[0034] The head end of the forward coil passing through the Lm layer of the phase slot R2 and the end of the reverse coil outside the Lm layer of the phase slot R3 are connected in series.

[0035] In this embodiment, in the same branch, two branch units connected in series, the threading end of the reverse coil of one branch unit passing through the L1 layer of the phase slot R2 is connected in series with the end of the forward coil of the next branch unit in the same branch at the L1 layer of another phase slot R1.

[0036] In this embodiment, for two adjacent branches belonging to the same phase, when one branch is wound, the phase slot R1 of the first branch unit of the branch and the phase slot R1 of the first branch unit of the other wound branch are respectively located under two adjacent pole pairs.

[0037] like Figure 2 , Figure 3 and Figure 4 As shown, the starting end of the first branch is at the 1st slot, the starting end of the second branch is at the 19th slot, the starting end of the third branch is at the 37th slot, and the starting end of the fourth branch is at the 55th slot.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A balanced winding flat wire motor for reducing slot voltage drop, comprising an armature core and an armature winding wound on the armature core, wherein the armature winding is a three-phase winding, including a U-phase winding, a V-phase winding and a W-phase winding, the number of pole pairs is p, and each pole and each phase of the U-phase winding, the V-phase winding and the W-phase winding on the armature core respectively correspond to Q phase slots, p ≥ Q, and each phase winding has multiple branches, characterized in that: Each branch consists of a plurality of branch units, each of which corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, wherein the phase slot R1 and the phase slot R2 belong to the same phase and are two phase slots under adjacent poles; the phase slot R2 and the phase slot R3 belong to the same phase and are two phase slots under adjacent poles; The branch unit comprises at least one forward coil and one reverse coil; the forward coil is wound on the armature core portion between the phase slot R1 and the phase slot R2 in a forward spiral manner; the reverse coil is wound on the armature core portion between the phase slot R2 and the phase slot R3 in a reverse spiral manner, and the forward coil and the reverse coil are connected in series; The head ends of two adjacent branches belonging to the same phase are respectively located in the first phase slots belonging to the same phase under two adjacent pole pairs; Each phase winding can be divided into an inner winding part close to the inner ring of the armature core and an outer winding part, and the cross-line distances of the inner winding part and the outer winding part are the same.

2. A balanced winding flat wire motor with reduced slot voltage drop according to claim 1, characterized in that: Multiple branch units belonging to the same branch are connected in series.

3. A balanced winding flat wire motor with reduced slot voltage drop according to claim 1 or 2, characterized in that: The phase slot is divided into L1-Lm layers from the slot bottom to the slot mouth, and the L1 layer is the layer closest to the slot mouth; the series connection of the forward coil and the reverse coil is located on the virtual cylindrical surface where the Lm layer or L1 layer of the phase slot is located.

4. A method for winding an armature winding of a flat wire motor, wherein the armature winding is a three-phase winding, including a U-phase winding, a V-phase winding and a W-phase winding, the number of pole pairs is p, and each pole and each phase of the U-phase winding, the V-phase winding and the W-phase winding on the armature core correspond to Q phase slots, p≥Q, and the phase slots are divided into L1-Lm layers from the bottom of the slot to the slot opening, and the L1 layer is the layer closest to the slot opening; each phase winding has multiple branches, and each branch is composed of multiple branch units connected in series, characterized in that: Each branch unit includes a forward coil and a reverse coil, and each branch unit corresponds to a phase slot R1, a phase slot R2 and a phase slot R3, wherein the phase slot R1 and the phase slot R2 belong to the same phase and are two phase slots under adjacent poles; The phase slot R2 and the phase slot R3 belong to the same phase and are two phase slots under adjacent poles; The forward coil is wound in a forward spiral manner on the armature core portion between the phase slot R1 and the phase slot R2, wherein the straight conductor of the forward coil in the phase slot R1 is located in all odd-numbered layers of the L1-Lm layer, and the straight conductor of the forward coil in the phase slot R2 is located in all even-numbered layers of the L1-Lm layer, and the threading end of the forward coil enters from the L1 layer of the phase slot R1 and finally passes through the Lm layer of the phase slot R2; the reverse coil is wound in a reverse spiral manner on the armature core portion between the phase slot R2 and the phase slot R3, wherein the straight conductor of the forward coil in the phase slot R2 is located in all odd-numbered layers of the L1-Lm layer, and the straight conductor of the forward coil in the phase slot R3 is located in all even-numbered layers of the L1-Lm layer, and the threading end of the reverse coil enters from the Lm layer of the phase slot R3 and finally passes through the L1 layer of the phase slot R2; The head end of the forward coil passing through the Lm layer of phase slot R2 and the end of the reverse coil outside the Lm layer of phase slot R3 are connected in series; The head ends of two adjacent branches belonging to the same phase are respectively located in the first phase slots belonging to the same phase under two adjacent pole pairs; Each phase winding can be divided into an inner winding part close to the inner ring of the armature core and an outer winding part, and the cross-line distances of the inner winding part and the outer winding part are the same.

5. A method for winding an armature winding of a flat wire motor according to claim 4, characterized in that: In the same branch, for two branch units connected in series, the threading end of the reverse coil of one branch unit passing through the L1 layer of the phase slot R2 is connected in series with the end of the forward coil of the next branch unit in the same branch in the L1 layer of another phase slot R1.

6. A method for winding an armature winding of a flat wire motor according to claim 4, characterized in that: For two adjacent branches belonging to the same phase, when one branch is wound, the phase slot R1 of the first branch unit of the branch and the phase slot R1 of the first branch unit of another branch that has been wound are respectively located under two adjacent pole pairs.

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