CN221305596U - Motor winding, motor stator and motor - Google Patents

Abstract

The utility model provides a motor winding, a motor stator and a motor, wherein the motor winding comprises a three-phase winding, each phase winding comprises a plurality of parallel branches, each parallel branch comprises a plurality of hairpin conductors which are connected in sequence, each hairpin conductor comprises two insertion sections which are used for being inserted into slot positions and a closed section which is connected with one end of each insertion section, which is away from each closed section, forms a welding end, and the welding end and the insertion section form an included angle; in the same parallel branch, the pitch of part of the hairpin conductors is a first preset value, the first preset value is smaller than the pole pitch, and the pitch of the rest of the hairpin conductors is a second preset value, and the second preset value is larger than the pole pitch. The motor stator comprises a stator core and the motor winding. The motor comprises the motor stator. The utility model reduces the whole volume of the motor, reduces the cost and improves the efficiency.

Description

Motor winding, motor stator and motor

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to a motor winding, a motor stator and a motor.

Background

Flat wire machines are a common motor type consisting of a stator and a rotor, typically using flat copper wire as winding wire. Due to the advantages of simple structure, low manufacturing cost, high efficiency and the like, the flat wire motor is widely applied to the fields of household appliances, office equipment, automobiles and the like.

At present, in the manufacturing process of a stator in a motor, a winding is made into a specific shape, the winding with the specific shape penetrates into a slot of a stator core, then the end parts are welded, the stator winding comprises a plurality of hairpin wires, and the plurality of hairpin wires penetrate into the stator slot of the stator core according to a certain arrangement mode to form the required winding of the single-phase motor or the multi-phase motor.

In the existing motor, the hairpin wires are generally arranged in a short-distance and whole-distance mode, so that the heights of the end parts of the stator are higher, the overall size of the motor is larger, the cost is high, and the efficiency is lower.

Disclosure of utility model

The embodiment of the utility model provides a motor winding, a motor stator and a motor, and aims to solve the technical problems of large overall size, high cost and low efficiency of the motor caused by the arrangement form of hairpin conductors in the existing motor.

In a first aspect, an embodiment of the present utility model provides a motor winding, including a three-phase winding, where each phase winding includes a plurality of parallel branches, each parallel branch includes a plurality of hairpin conductors connected in sequence, each hairpin conductor includes two insertion sections for being inserted into slots, and a closed section connected to one end of each insertion section, where one end of each insertion section, facing away from each closed section, forms a welding end, and the welding end and the insertion section form an included angle;

In the same parallel branch, the pitch of part of the hairpin conductors is a first preset value, the first preset value is smaller than the pole pitch, and the pitch of the rest of the hairpin conductors is a second preset value, wherein the second preset value is larger than the pole pitch;

in each parallel branch, the insertion section near the start end is located at the adjacent layer of the outermost layer, and the insertion section near the end is located at the outermost layer.

With reference to the first aspect, in one possible implementation manner, the insertion sections in different hairpin conductors are overlapped in the same slot, and N layers are overlapped from inside to outside on the insertion sections in the same slot, wherein N is greater than or equal to 4;

the number of layers of the two inserting sections in the hairpin conductor with the pitch of the first preset value is the same or different;

The number of layers of the two insertion sections in the hairpin conductor with the pitch being the second preset value is the same.

With reference to the first aspect, in one possible implementation manner,

In the hairpin conductor (10) with the first preset pitch, two inserting sections (11) with the same layer number are positioned on the 1 st layer, and two inserting sections (11) with different layer numbers are positioned on two adjacent layers from the 2 nd layer to the (N-1) layer;

in the hairpin conductor (10) with the pitch of a second preset value, the two insertion sections (11) are both positioned on the Nth layer.

With reference to the first aspect, in a possible implementation manner, in the same parallel branch, the welding ends in two adjacent hairpin conductors are lap-welded or plug-welded;

When the welding ends are in lap welding, a first lap joint surface is arranged on the end face of the welding end;

when the welding end is in plug-in welding, a first slot or a first plug is arranged on the end face of the welding end.

With reference to the first aspect, in one possible implementation manner, the first overlap surface is a bevel or a stepped surface.

With reference to the first aspect, in a possible implementation manner, in the same hairpin conductor, the closing section includes a first closing end integrally formed with one of the insertion sections, and a second closing end integrally formed with the other insertion section, and the first closing end and the second closing end are detachably connected.

With reference to the first aspect, in one possible implementation manner, the first closed end and the second closed end are lap-welded, and end surfaces of the first closed end and the second closed end are provided with second lap-joint surfaces;

or the first closed end and the second closed end are in plug-in welding, the end face of the first closed end is provided with a second slot, and the end face of the second closed end is provided with a second plug matched with the second slot.

With reference to the first aspect, in a possible implementation manner, the second overlapping surface is a bevel or a stepped surface.

Compared with the prior art, the scheme provided by the embodiment has the advantages that each parallel branch comprises two kinds of pitch hairpin conductors, one of the two pitches is shorter, the other pitch is longer, and the space for downwards pressing the hairpin is downwards pressed for the end part through the long-distance and short-distance lap winding arrangement mode, so that the height of the end part of the stator can be reduced, the overall size of the motor is reduced, the cost is reduced, and the efficiency is improved.

In a second aspect, an embodiment of the present utility model further provides a stator of an electric machine, including:

a stator core including a plurality of stator slots distributed in a circumferential direction;

the motor winding is wound on the stator core, and the insertion section is positioned in the stator groove.

In a third aspect, an embodiment of the present utility model further provides an electric machine, including the above-mentioned electric machine stator.

The motor stator and the motor provided by the embodiment adopt the motor winding, and after the motor winding is wound on the motor stator, the overall end part is lower in height, and then the shell with smaller volume can be selected, so that the volume of the motor is reduced, the cost is reduced, and the efficiency is improved.

Drawings

Fig. 1 is a schematic plan view of an arrangement structure of a motor winding according to an embodiment of the present utility model;

Fig. 2 is a schematic plan view showing an arrangement structure of parallel branches in a B-phase winding according to an embodiment of the present utility model;

Fig. 3 is a schematic diagram of a connection structure of hairpin conductors employed in a conventional motor;

FIG. 4 is a schematic view of various connection embodiments of a weld end employed in an embodiment of the present utility model;

FIG. 5 is a schematic representation of various connected embodiments of closure segments employed in embodiments of the present utility model.

Reference numerals illustrate:

10-hairpin conductors; 11-an insertion section; 12-closing the segment; 121-a first closed end; 122-a second closed end; 13-welding ends;

20-a first faying surface; 21-a second faying surface;

30-a first slot; 31-a first plug; 32-a second slot; 33-a second plug.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the present application, "inner" refers to a side closer to the motor stator axis, and "outer" refers to a side farther from the motor stator axis. I.e. "inside-out", i.e. from the inner ring to the outer ring in the radial direction of the motor stator.

Referring to fig. 1 to 5, a motor winding according to the present utility model will be described. The motor winding comprises a three-phase winding, each phase winding comprises a plurality of parallel branches, each parallel branch comprises a plurality of hairpin conductors 10 which are connected in sequence, each hairpin conductor 10 comprises two insertion sections 11 which are used for being inserted into slots, a closed section 12 which is connected with one end of each insertion section 11, which is away from each closed section 12, forms a welding end 13, and the welding end 13 and the insertion section 11 are arranged in an included angle; in the same parallel branch, the pitch of part of the hairpin conductors 10 is a first preset value, and the pitch of the rest of the hairpin conductors 10 is a second preset value, wherein the second preset value is larger than the first preset value.

The slot in this case is a stator slot in the motor stator. The pitch and pole pitch are conventional factors in the field of hairpin motors and are not described in detail herein.

As an example, the first preset value may be 5 and the second preset value may be 7.

Compared with the prior art, the motor winding provided by the embodiment has the advantages that each parallel branch comprises the hairpin conductors 10 with two pitches, one of the two pitches is shorter, the other pitch is longer, and the space for downwards pressing the hairpin is reserved for the end part through the arrangement mode of long-distance and short-distance lap winding, so that the height of the end part of the stator can be reduced, the whole size of the motor is reduced, the cost is reduced, and the efficiency is improved.

In some embodiments, a modified implementation of the motor winding described above may employ the structure shown in fig. 1-2. Referring to fig. 1 to 2, the insert sections 11 in different hairpin conductors 10 are overlapped in the same slot, and the insert sections 11 in the same slot are overlapped with multiple layers from inside to outside; the number of layers of the two insertion sections 11 in the hairpin conductor 10 with the pitch of the first preset value is the same or different; the number of layers of two insert sections 11 in the hairpin conductor 10 having the pitch of the second preset value is the same.

When the number of slots per pole per phase is z/2mp=2, each parallel branch comprises p long-distance (z/2p+1) same-layer card issuers, p short-distance (z/2 p-1) same-layer card issuers and a plurality of short-distance (z/2 p-1) cross-layer card issuers.

Wherein z is the number of stator slots, m is the number of phases, and p is the number of pole pairs; the long distance (z/2p+1), namely the second preset value is (z/2p+1); the short distance (z/2 p-1), i.e. the first preset value, is (z/2 p-1).

In some embodiments, a specific implementation of the parallel branch may adopt a structure as shown in fig. 1 to 2. Referring to fig. 1 to 2, in each parallel branch, the insertion section 11 near the start end is located at the adjacent layer of the outermost layer, and the insertion section 11 near the end is located at the outermost layer; similarly, the insertion section 11 near the start point in each winding cycle unit is also located in the adjacent layer of the outermost layer, and the insertion section 11 near the end point is located in the outermost layer. The insert sections 11 in each slot position have N layers, wherein N is more than or equal to 4, and the first layer is the outermost layer (namely, the layer far away from the motor rotor and also can be called the outermost layer relative to the motor axis), and the nth layer is the innermost layer (namely, the layer near the motor rotor and also can be called the innermost layer relative to the motor axis).

In the actual winding process, each parallel branch comprises p winding circulation units, the number of hairpin conductors 10 contained in each winding circulation unit is the same, each winding circulation unit takes a second layer as a first starting point, firstly (N-2)/2 cross-layer hairpin is wound from the second layer to the N-1 layer, then the N layer adopts a same-layer hairpin, then (N-2)/2 cross-layer hairpin is wound from the N-1 layer back to the 2 layer, and then the 1 layer adopts a same-layer hairpin. The P loops are wound in this order to form a branch.

And the starting point of the second branch is connected with P winding units along the circumferential direction to form the second branch according to the winding method of the first branch in the same-layer adjacent grooves of the first branch. The rest of the branches and so on.

According to the winding process, two insert sections 11 with the same layer number are positioned on the 1 st layer, and two insert sections 11 with different layer numbers are positioned on two adjacent layers in the 2 nd to (N-1) layers in the hairpin conductor 10 with the first preset pitch; in the hairpin conductor 10 with the pitch of the second preset value, both insert sections 11 are located in the nth layer. I.e. the insert sections 11 of the outermost layer are all in the hairpin conductor 10 of the short distance and the same layer, the insert sections 11 of the middle layer (i.e. other layers than the innermost layer and the outermost layer) are all in the hairpin conductor 10 of the short distance and the cross-layer, and the insert sections 11 of the innermost layer are all in the hairpin conductor 10 of the long distance and the same layer.

In some embodiments, a specific connection manner of the hairpin conductor 10 may be as shown in fig. 4 to 5. Referring to fig. 4 to 5, in the same parallel branch, the welding ends 13 in two adjacent hairpin conductors 10 are lap-welded or plug-welded; when the welding end 13 is lap welding, the end face of the welding end 13 is provided with a first lap face 20; when the welding end 13 is in plug welding, the end face of the welding end 13 is provided with a first slot 30 or a first plug 31.

The conventional overlap surface of the welding terminal 13 is shown in fig. 3, and the welding terminal 13 of this form has a welding portion parallel to the insertion section 11 so as to protrude after welding, thereby heightening the end height of the motor winding and making the copper wire use large.

The lap welding and the plug welding in the welding ends 13 in the embodiment can increase the contact area of two adjacent welding ends 13 and improve the structural stability after welding; and the lap welding and the plug welding do not need to be provided with welding parts as shown in fig. 3, so that the height of the end part of the motor winding is reduced, the consumption of copper wires is reduced, the resistance value is reduced, and the motor efficiency is improved.

Specifically, the first faying surface 20 is a beveled or stepped surface.

In some embodiments, a modified implementation of the closure segment 12 described above may employ a configuration as shown in FIG. 5. Referring to fig. 5, in the same hairpin conductor 10, the closed section 12 includes a first closed end 121 integrally formed with one of the insertion sections 11, and a second closed end 122 integrally formed with the other insertion section 11, the first closed end 121 and the second closed end 122 being detachably connected. The conventional hairpin conductor 10 generally adopts a wire, after the wire is penetrated from the penetrating slot, the wire is bent to penetrate from the penetrating slot, and the closing section 12 and the inserting section 11 are of an integrated structure, but the slot is a half-open slot, so that the operation is inconvenient in bending; in this embodiment, the closed section 12 is divided into the first closed end 121 and the second closed end 12, so that one hairpin conductor 10 can be divided into two wires, one wire penetrates from the penetrating slot, the other wire penetrates from the penetrating slot, and then the first closed end 121 and the second closed end 122 are connected, which is convenient for operation, reduces labor intensity, shortens threading time, and improves threading efficiency.

For example, the hairpin conductor 10 shown in fig. 1-2 at 7 (2) -2 (3), one insert section 11 is positioned at the second layer of the 7 slot, the other insert section 11 is positioned at the third layer of the 2 slot, one wire is threaded from the 7 slot, the other wire is threaded from the 2 slot, then one ends of the wires in the 7 slot and the 2 slot are welded together, and the free end of each wire is used for welding with the welding end 13 of the adjacent hairpin conductor 10.

In some embodiments, a specific connection manner of the first closed end 121 and the second closed end 122 may be as shown in fig. 5. Referring to fig. 5, the first closed end 121 and the second closed end 122 are lap welded, and the end surfaces of the first closed end 121 and the second closed end 122 are respectively provided with a second lap surface 21; or the first closed end 121 and the second closed end 122 are in plug-in welding, the end surface of the first closed end 121 is provided with a second slot 32, and the end surface of the second closed end 122 is provided with a second plug 33 matched with the second slot 32.

Overlap welding and plug welding in the first closed end 121 and the second closed end 122 in the embodiment can increase the contact area of the first closed end 121 and the second closed end 122, and improve the structural stability after welding; and the lap welding and the plug welding can reduce the height of the end part of the motor winding, reduce the consumption of copper wires, reduce the resistance value and improve the motor efficiency.

Specifically, the second overlap surface 21 is a bevel or a stepped surface.

Based on the same inventive concept, the embodiment of the application also provides a motor stator, which comprises a stator core and the motor winding, wherein the stator core comprises a plurality of stator slots distributed along the circumferential direction; the motor winding is wound on the stator core, and the insertion section 11 is positioned in the stator slot.

The stator slot comprises a plurality of even slots and a plurality of odd slots, wherein in the odd slots, the odd layer and the even layer of the hairpin legs respectively carry the same phase current, but the odd layer and the even layer are different phase currents; all the even and odd layer legs in the even slot carry the same phase current.

Compared with the prior art, the motor stator provided by the embodiment has the advantages that the motor winding is adopted, after the motor winding is wound on the motor stator, the overall end part is lower in height, and then the shell with smaller size can be selected, so that the size of the motor is reduced, the cost is reduced, and the efficiency is improved.

Based on the same inventive concept, the embodiment of the application also provides a motor, which comprises the motor stator.

Compared with the prior art, the motor provided by the embodiment has the advantages that the motor stator is small in size, so that the shell with small size can be selected, the size of the motor is reduced, the cost is reduced, and the efficiency is improved.

Here, 2 parallel branches are taken as an example for illustration:

ABC is the input end of each phase winding, XYZ is the output end of each phase winding, each phase winding comprises 2 parallel branches, namely, the A phase winding comprises A1-X1 and A2-X2; the phase B winding comprises B1-Y1 and B2-Y2; the C phase winding comprises C1-Z1 and C2-Z2;

The number of the stator slots is 48, the number of poles is 8, the number of layers of the insertion section 11 in each stator slot is 6, and two parallel branches of the B-phase winding are used for illustration;

The winding mode of the second parallel branch is the same as that of the first parallel branch, the two parallel branches have the same positions relative to the magnetic steel, each position has the same number of slot layers, and circulation between the two parallel branches is avoided.

The specific arrangement is as follows (see fig. 2):

(1) Branch B1:

A first winding circulation unit:

7(2)-2(3)-7(4)-2(5)-7(6)-12(6)-7(5)-12(4)-7(3)-12(2)-7(1)-14(1)

A second winding circulation unit:

19(2)-14(3)-19(4)-14(5)-19(6)-24(6)-19(5)-24(4)-19(3)-24(2)-19(21)-26(1)

third winding circulation unit:

31(2)-26(3)-31(4)-26(5)-31(6)-26(6)-21(5)-26(4)-21(3)-26(2)-21(1)-14(1)

Fourth winding circulation unit:

43(2)-38(3)-43(4)-38(5)-43(6)-48(6)-43(5)-48(4)-43(3)-48(2)-43

(1)-2(1)

(2) Branch B2:

A first winding circulation unit:

8(1)-1(1)-6(2)-1(3)-6(4)-1(5)-6(6)-1(6)-44(5)-1(4)-44(3)-1

(2)

A second winding circulation unit:

44(1)-37(1)-42(2)-37(3)-42(4)-37(5)-42(6)-37(6)-32(5)-37(4)-32

(3)-37(2)

third winding circulation unit:

32(1)-25(1)-30(2)-25(3)-30(4)-25(5)-30(6)-25(6)-20(5)-25(4)-20(3)-25(2)

Fourth winding circulation unit:

20(1)-13(1)-28(2)-13(3)-28(4)-13(5)-18(6)-13(6)-18(5)-13(4)-18(3)-13(2)

wherein 7 (2) is the second layer in the groove number 7, and 2 (3) is the third layer in the groove number 2; 7 (2) -2 (3) is a hairpin conductor 10, and the welding end 13 corresponding to the insertion section 11 of the third layer in the slot number 2 needs to be connected with the welding end 13 corresponding to the insertion section 11 of the fourth layer in the slot number 7.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The motor winding comprises three-phase windings, each phase winding comprises a plurality of parallel branches, and is characterized in that each parallel branch comprises a plurality of hairpin conductors (10) which are connected in sequence, each hairpin conductor (10) comprises two insertion sections (11) which are inserted into slots, a closed section (12) which is connected to one end of each insertion section (11), one end of each insertion section (11) deviating from each closed section (12) forms a welding end (13), and each welding end (13) and each insertion section (11) are arranged in an included angle;

In the same parallel branch, the pitch of part of the hairpin conductors (10) is a first preset value, the first preset value is smaller than the pole pitch, and the pitch of the rest of the hairpin conductors (10) is a second preset value, wherein the second preset value is larger than the pole pitch;

In each parallel branch, the insertion section (11) near the start end is located at the adjacent layer of the outermost layer, and the insertion section (11) near the end is located at the outermost layer.

2. A motor winding according to claim 1, characterized in that the insert sections (11) in different hairpin conductors (10) are overlapped in the same slot, the insert sections (11) in the same slot are overlapped with N layers from inside to outside, N being equal to or greater than 4;

The number of layers of the two inserting sections (11) in the hairpin conductor (10) with the pitch being a first preset value is the same or different;

The number of layers of the two insertion sections (11) in the hairpin conductor (10) with the pitch being a second preset value is the same.

3. A motor winding according to claim 2, characterized in that, in the hairpin conductor (10) with a pitch of a first preset value, two insert sections (11) with the same number of layers are located in layer 1, two insert sections (11) with different numbers of layers being located in two adjacent layers from layer 2 to layer (N-1);

in the hairpin conductor (10) with the pitch of a second preset value, the two insertion sections (11) are both positioned on the Nth layer.

4. A motor winding according to claim 1, characterized in that in the same parallel branch, the welding ends (13) in two adjacent hairpin conductors (10) are lap-welded or plug-welded;

When the welding end (13) is in lap welding, a first lap joint surface (20) is arranged on the end face of the welding end (13);

when the welding end (13) is in plug-in welding, a first slot (30) or a first plug (31) is arranged on the end face of the welding end (13).

5. A motor winding according to claim 4, characterized in that the first landing surface (20) is a bevel or a stepped surface.

6. A motor winding according to claim 1, characterized in that in the same hairpin conductor (10), the closing segment (12) comprises a first closing end (121) integrally formed with one of the insertion segments (11) and a second closing end (122) integrally formed with the other insertion segment (11), the first closing end (121) and the second closing end (122) being detachably connected.

7. The motor winding according to claim 6, wherein the first closed end (121) and the second closed end (122) are lap welded, and end surfaces of the first closed end (121) and the second closed end (122) are provided with a second lap surface (21);

Or the first closed end (121) and the second closed end (122) are in plug-in welding, a second slot (32) is arranged on the end face of the first closed end (121), and a second plug (33) matched with the second slot (32) is arranged on the end face of the second closed end (122).

8. A motor winding according to claim 7, characterized in that the second overlap surface (21) is a bevel or a stepped surface.

9. A motor stator, comprising:

a stator core including a plurality of stator slots distributed in a circumferential direction;

A motor winding according to any one of claims 1-8, wound around said stator core, said insert segments (11) being located in said stator slots.

10. An electric machine comprising the electric machine stator of claim 9.