CN211606228U

CN211606228U - Non-circulation hairpin motor

Info

Publication number: CN211606228U
Application number: CN201922440296.XU
Authority: CN
Inventors: 廖肖峰
Original assignee: Klinweft Electric Drive System Jiaxing Co ltd
Current assignee: Klinweft Electric Drive System Jiaxing Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-09-29
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a loop-free hairpin motor, which is characterized in that different branches of a same-phase winding are circumferentially stacked in a staggered-layer splicing mode, so that the loop problem caused by inconsistent resistance and counter potential is effectively reduced; therefore, the heating, noise and vibration of the motor can be effectively reduced, the insulation aging of the winding is delayed, and the service life of the motor is prolonged.

Description

Non-circulation hairpin motor

Technical Field

The utility model relates to a motor field, especially a hairpin motor.

Background

The electric drive system is one of the core parts of the new energy automobile, and has an important influence on the performance of the new energy automobile.

The electric driving system of the electric automobile mainly comprises four parts: the system comprises a driving motor, a speed changer, a power converter and a controller. The driving motor is the core of the electric driving system, the performance and efficiency of the driving motor directly affect the performance of the electric automobile, and the size and weight of the driving motor and the transmission also affect the overall efficiency of the automobile.

Flat wire motors have become well known in the industry as drive motors for electric vehicles. The heat exchanger has the advantages of small volume, material saving, high efficiency, strong heat conduction, low temperature rise, low noise and the like. However, compared with the traditional round wire motor, the flat wire motor has the defects of difficult design, difficult process, complex manufacture of automatic equipment, high welding reliability requirement and large high-frequency loss. The flat wire Hairpin (Hairpin) is an important component part in a flat wire motor, is formed by bending and twisting a flat copper wire, is U-shaped and I-shaped in common shapes, and can realize other shapes according to requirements. After the hairpin is inserted into the stator core, the straight line edges can be twisted according to the requirement of a wiring diagram, so that the two sections of welded edges are aligned. Fig. 1 shows the change process of the flat wire hairpin twisting head.

The flat wire motor is complicated in preparation process, and generally comprises inserting slot paper, manufacturing a hairpin, threading the hairpin, welding end flaring, welding end welding, insulating coating of welding points, integral insulating treatment and the like.

In the process, the same coils of the same layer are generally connected in series to form a group of windings when the card is penetrated and issued, and by adopting the mode, the total length and the relative position of the coils of each layer are different, so that the resistance value and the counter potential of each branch circuit connected in parallel are different, circulation occurs among the coils, the heating of the motor is easily caused, the noise and the vibration are increased, the insulation aging of the windings is accelerated, and the service life of the motor is shortened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a no circulation hairpin motor for solve current flat wire motor because of having the motor that the circulation leads to generate heat, the noise is big, vibrate big, the short-lived technical problem.

To achieve the above objective, the present invention provides the following technical solutions:

the loop current hairpin motor, each way hairpin is around the circumference symmetry equipartition of unshakable in one's determination.

Furthermore, in the utility model, each path of hairpin comprises a plurality of groups, and each group of hairpins are connected in sequence and numbered;

for each group of hairpins, the adjacent straight line sides are interconnected in sequence;

in the radial direction, the odd-numbered groups of hairpins are distributed in a way of staggering one layer by one layer from the outermost layer to the innermost layer, and the even-numbered groups of hairpins are distributed in a way of staggering one layer by one layer from the innermost layer to the outermost layer;

in the circumferential direction, odd groups of hairpins are distributed in the first preset clock direction, and even groups of hairpins are distributed in the second preset clock direction; the first predetermined clock direction is opposite to the second predetermined clock direction.

Has the advantages that:

according to the technical scheme, the technical scheme of the utility model provides a no-circulation hairpin motor, through the mode of staggered floor grafting, the different branch road circumference of homophase winding distributes, has effectively reduced the circulation problem that resistance and back emf are inconsistent and bring; therefore, the heating, noise and vibration of the motor can be effectively reduced, the insulation aging of the winding is delayed, and the service life of the motor is prolonged.

The utility model discloses a method and the number of slots of stator, the number of piles in every groove, whether the whole distance and every extremely down slot number etc. all do not have relations, therefore adaptability is wide.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram of the two types of hair clips before and after bending according to the present invention;

fig. 2 is a schematic end view of an iron core according to an embodiment of the present invention;

fig. 3 is an enlarged schematic view of a part of an end surface of an iron core according to an embodiment of the present invention;

fig. 4 is an expanded and enlarged schematic view of a part of an end surface of an iron core according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an access line according to a first embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a flow direction of a phase a first branch current according to a first embodiment of the present invention;

fig. 7 is a schematic view illustrating a current flow direction of the phase a second branch according to a first embodiment of the present invention;

fig. 8 is a schematic view illustrating a current flow direction of the phase a third branch according to a first embodiment of the present invention;

fig. 9 is a schematic view illustrating a current flow direction of the phase a fourth branch according to a first embodiment of the present invention;

fig. 10 shows a connection manner of the phase a windings connected in parallel according to a first embodiment of the present invention;

fig. 11 shows a connection manner of the parallel connection of the phase B windings according to the first embodiment of the present invention;

fig. 12 shows a connection manner of the C-phase windings connected in parallel according to a first embodiment of the present invention;

fig. 13 is a schematic diagram of the position of an access line according to a third embodiment of the present invention;

fig. 14 is a schematic view of a flow direction of a phase a first branch current in a third embodiment of the present invention;

fig. 15 is a schematic view of a current flow direction of the phase a second branch according to a third embodiment of the present invention;

fig. 16 is a schematic current flow diagram of a third branch of the phase a according to a third embodiment of the present invention;

fig. 17 is a schematic layout diagram of an a-phase fourth branch hairpin according to a third embodiment of the present invention;

fig. 18 shows a connection manner of the phase a windings connected in parallel in the third embodiment of the present invention;

fig. 19 shows a connection manner of the parallel connection of the phase B windings in the third embodiment of the present invention;

fig. 20 shows a connection manner of parallel connection of C-phase windings in a third embodiment of the present invention;

fig. 21 is a schematic diagram of an access line according to a fourth embodiment of the present invention;

fig. 22 is a schematic diagram illustrating a flow direction of a phase a first branch current in a fourth embodiment of the present invention;

fig. 23 is a schematic view of a current flow direction of the a-phase second branch according to a fourth embodiment of the present invention;

fig. 24 is a schematic current flow diagram of a phase a third branch according to a fourth embodiment of the present invention;

fig. 25 is a schematic layout diagram of an a-phase fourth branch hairpin according to a fourth embodiment of the present invention;

fig. 26 shows a connection manner of the phase a windings connected in parallel according to the fourth embodiment of the present invention;

fig. 27 shows a connection manner of parallel connection of the B-phase windings in the fourth embodiment of the present invention;

fig. 28 shows a connection manner of the C-phase windings connected in parallel according to the fourth embodiment of the present invention;

FIG. 29 is a phase current versus time graph obtained from a simulation of a prior art motor under no-load conditions;

FIG. 30 is a phase current versus time plot obtained from a simulation of a motor employing a no-circulating winding design under no-load conditions;

FIG. 31 is a phase current versus time graph obtained from a simulation of a prior art motor under load conditions;

fig. 32 is a phase current versus time graph obtained from a simulation of a motor employing a no-circulating winding design under load conditions.

Detailed Description

For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

The physical quantities related to the embodiments of the present invention are defined as follows:

the number of poles of the stator core is N, the number of pole pairs is N/2, the number of slots is M, the number of layers in each slot is X, the number of parallel paths is a common divisor of the number of pole pairs, and the same number of slots under each pole is N; the number of hairpins per path C in each phase winding.

And for the full-pitch winding, the pitch is M/N, wherein M is more than or equal to 3 nN.

The number C of hairpins per path in each phase winding is more than or equal to MX/(6D).

In the design process of the flat wire motor, specific numerical values of the physical quantities are designed according to the design requirements of the whole machine, the design belongs to basic design, and the design is necessary skills of technicians in the field and is not described herein.

The specific embodiment of the utility model provides a concrete hairpin's arrangement mode, obtains good application effect from this on the basis of basic design, mainly can eliminate the circulation, brings the promotion of whole motor performance.

The basic starting point of the utility model is to symmetrically distribute the hair clips around the circumference of the iron core, so as to eliminate the phase difference existing between the hair clips, thereby avoiding the circulation.

Therefore, the problem to be solved is how to arrange the hair clip to satisfy the above-mentioned circumferential symmetric distribution.

The utility model provides a solution as follows:

each card issuing path comprises a plurality of groups, and each group of cards are sequentially connected and numbered; for each group of hairpins, the adjacent straight line sides are interconnected in sequence; in the radial direction, the odd-numbered groups of hairpins are distributed in a way of staggering one layer by one layer from the outermost layer to the innermost layer, and the even-numbered groups of hairpins are distributed in a way of staggering one layer by one layer from the innermost layer to the outermost layer; in the circumferential direction, odd groups of hairpins are distributed in the first preset clock direction, and even groups of hairpins are distributed in the second preset clock direction; the first predetermined clock direction is opposite to the second predetermined clock direction.

Further, in order to improve the adaptability and the operation convenience of the motor, the current inlet end of each hairpin is arranged on the outermost layer, and the current outlet end of each hairpin is arranged on the outermost layer.

The hair clips belonging to the same path need to be connected into a line, so that the connection between the groups needs to be carried out. The utility model discloses in, mainly include two kinds of connected modes:

in the first mode, in two groups of hair clips with any adjacent numbers, two straight line edges positioned on the same layer are interconnected, the same layer is the innermost layer or the outermost layer, and the two straight line edges belong to different groups.

In the second mode, in two groups of hair clips with any adjacent numbers, two straight line edges respectively positioned on the innermost layer and the outermost layer are interconnected, and the two straight line edges belong to different groups.

Neither the first or second mode has a negative effect on reducing the circulating current. The only difference is in the form of the motor and the complexity of the machining process.

Furthermore, the present invention is not affected by the circular current generated by the integral pitch winding, so that the adjacent straight edges of each group of hairpin can have equal pitch or unequal pitch in the circumferential direction.

Further, the utility model discloses in, select U type hairpin or I type hairpin to and how many U types, how many I types of selection make up, need to consider factors such as cost, manufacturing process comprehensively. The utility model provides a comprehensive consideration scheme for selecting the type of the hair clip. The scheme is as follows:

defining the number of layers of each slot on the iron core as X, and P hairpin types; the P satisfies:

when X is an odd number, the P is less than or equal to (X + 3)/2;

when X is an even number, the P is less than or equal to (X + 4)/2.

As shown in fig. 1, the present invention relates to 2 kinds of hair clips, which are U-shaped hair clip and I-shaped hair clip, respectively, as shown in the left side of fig. 1. When the U-shaped hairpin and the I-shaped hairpin are inserted into the iron core respectively and need to be connected with other hairpins, as shown in the right side of fig. 1, the straight line sides are twisted according to the wiring requirement, so that the two welding sides are aligned and welded.

It should be noted that, the present invention, on the premise of satisfying the above requirements, is not related to the number of poles, the number of slots, the number of layers in each slot, the number of parallel circuits, the same number of slots under each pole, whether the pitch is the same, the type of the hairpin, etc. for solving the problem of the circulation.

The following description is given by way of exemplary embodiments.

The first embodiment,

In this embodiment, the number of layers X in each slot is 48 slots, the number of poles N is 8, the number of parallel paths D is 4, the same number of slots N under each pole N is 2, and a full-pitch winding, a three-phase motor, and a full-U hairpin are taken as examples.

As shown in fig. 2-4, the structure of the stator core of the present embodiment is schematically illustrated. 48 grooves are uniformly distributed in the range of 360 degrees, each groove is provided with 8 layers, and the number of the grooves is from 8 to 1 from outside to inside.

Since the stator core has 48 slots with 8 wires per slot, the number of hairpins is 48 × 8/2 — 192 pcs.

On the basis of the above-mentioned technical scheme,

the motor is a three-phase motor, so that the number of the hairpins of each phase winding is 192/3-64 pcs.

The motor is provided with 4 parallel circuits, so that the number of the hairpin of each winding is 64/4-16 pcs.

Since the motor employs a pitch winding, the pitch is 48/8-6. Therefore, the straight line edge of the U-shaped hairpin is generally 1^7, 2^8, 3^9, 4^10 and the like.

Further, the motor has 48 slots and 8 poles, each pole comprises 48/8-6 slots, each pole pair comprises 12 slots, and the windings are arranged in an AAzzBBxxCCyy mode. Wherein capital letters indicate current inflow, lowercase letters indicate current outflow, phase a is a → x, phase B is B → y, and phase C is C → z. See in particular fig. 5.

Because each path is 16 hair clips, each U-shaped hair clip occupies two slots, the hair clips are divided into four types of hair clips, namely 1^2, 3^4, 5^6 and 7^8 according to the layer number of the straight line edge, and each type of hair clip is 4 pcs.

For convenience of description, the description is made specifically for phase a, and the remaining two phases are made with reference to phase a, arranged at 120 ° electrical angle intervals.

For convenience of illustration, the number of branches is named A1^ x1, A2^ x2, A3^ x3 and A4^ x4, wherein the 16 hairpins in each branch are divided into 4 groups with circumference symmetry, and then named A1.1^ x1.1, A1.2^ x1.2, A1.3^ x1.3, A1.4^ x1.4 and the like according to the direction of current flowing.

FIGS. 6-9 are schematic diagrams of the current flow in branches A1^ x1, A2^ x2, A3^ x3, and A4^ x4, respectively. The line connecting the two cells indicates that there is current flowing between the two cells.

Specifically, for branch A1^ x1, as shown in FIG. 6, the direction is clockwise from left to right. Arranging the hairpins as shown in the figure, and then connecting the A1.3 anticlockwise torsion head with the x1.1 clockwise torsion head, connecting the A1.2 clockwise torsion head with the x1.3 anticlockwise torsion head, and connecting the A1.4 anticlockwise torsion head with the x1.2 clockwise torsion head to finish the winding connection with the branch number of A1^ x1.

In the winding of A1^ x1, the current flow is shown as follows according to the position of the straight side of the hairpin, i.e., in a specific "slot-layer number" manner:

(1-8，7-7)、(13-6，19-5)、(25-4，31-3)、(37-2，43-1)、(1-1，43-2)、(37-3，31-4)、(25-5，19-6)、(13-7，7-8)、(2-8，8-7)、(14-6，20-5)、(26-4，32-3)、(38-2,44-1)、(2-1，44-2)、(38-3，32-4)、(26-5，20-6)(14-7，8-8)。

wherein, two positions in the same bracket () represent the positions of two straight edges belonging to the same U-shaped hairpin.

Similarly, as shown in fig. 7, the a2.3 counterclockwise twisted head is connected with the X2.1 clockwise twisted head, the a2.2 clockwise twisted head is connected with the X2.3 counterclockwise twisted head, and the a2.4 counterclockwise twisted head is connected with the X2.2 clockwise twisted head, so as to complete the winding connection with branch number A2^ X2.

Similarly, as shown in fig. 8, the a3.3 counterclockwise twisted head is connected with the X3.1 clockwise twisted head, the a3.2 clockwise twisted head is connected with the X3.3 counterclockwise twisted head, and the a3.4 counterclockwise twisted head is connected with the X3.2 clockwise twisted head, so as to complete the winding connection with branch number A3^ X3.

Similarly, as shown in fig. 9, the a4.3 counterclockwise twisted head is connected with the X4.1 clockwise twisted head, the a4.2 clockwise twisted head is connected with the X4.3 counterclockwise twisted head, and the a4.4 counterclockwise twisted head is connected with the X4.2 clockwise twisted head, so as to complete the winding connection with branch number A4^ X4.

Thus, the A-phase 4-way card issuing is completed.

Further, the current inlet end of each hairpin is arranged at the outermost layer. In the winding of A1^ x1, the straight line side at 1-8 is at the 8 th layer of the No. 1 slot as the current inlet end.

Similarly, the current outlet end of each hairpin is arranged at the outermost layer. In the winding of A1^ x1, the straight line side at 8-8 is at the 8 th layer of the No. 8 slot as the current outlet end.

Next, the 4-way hair cards are connected in parallel, as shown in fig. 10, a1, a2, A3 and a4 are outgoing lines and are connected to the outside, that is, to an a-phase busbar, and x1, x2, x3 and x4 are dotted lines and are connected to y1z1, y2z2, y3z3 and y4z4, respectively, to form independent 4 star points.

Similarly, a parallel diagram of the B-phase 4-way hair card is obtained as shown in fig. 11, where B1, B2, B3, and B4 are outgoing lines connected to the B-phase busbar, and y1, y2, y3, and y4 are dotted lines connected to x1z1, x2z2, x3z3, and x4z4, respectively, to form independent 4 star points.

Similarly, a parallel diagram of the C-phase 4-way hair card is obtained as shown in fig. 12, where C1, C2, C3, and C4 are outgoing lines connected to the C-phase busbar, and z1, z2, z3, and z4 are star-point lines connected to x1y1, x2y2, x3y3, and x4y4, respectively, to form independent 4 star points.

Example II,

In this embodiment, the number of layers X in each slot is 8, the number of poles N is 8, the number of parallel paths D is 4, the same number of slots N in each pole is 2, and a full-pitch winding, a three-phase motor, and a hybrid hairpin are taken as examples.

As in the first embodiment, this embodiment also uses a full pitch winding, and the pitch is 48/8-6. The winding arrangement is AAzzBBxxCCyy, wherein capital letters indicate current inflow, lowercase letters indicate current outflow, phase A is A → x, phase B is B → y, and phase C is C → z. See in particular fig. 5.

Different from the first embodiment, the present embodiment adopts a hybrid hair clip, that is, the present embodiment includes both U-type hair clips and I-type hair clips, specifically, 6 types of hair clips are provided for the iron core, and the number of hair clips is 17. The method comprises the following specific steps:

numbering each issue card, wherein:

the first serial hairpin is an I-type hairpin and is positioned on the 8 th layer; for each hairpin, the first numbered hairpin comprises 2 hairpins and is respectively used as a current inlet end and a current outlet end of each hairpin.

The second numbered hair clip is a U-shaped hair clip, two straight line sides of the hair clip are 7-span-6 type, wherein the 7-span-6 type represents that one straight line side is on the 7 th layer, and the other straight line side is on the 6 th layer. The second numbered hair clip includes 4 for each hair clip.

The third numbered hair clip is a U-shaped hair clip, two straight line sides of the hair clip are 5-span-4 type, wherein 5-span-4 type means that one straight line side is on the 5 th layer, and the other straight line side is on the 4 th layer. The third numbered hair clip includes 4 for each hair clip.

The fourth numbered hair clip is a U-shaped hair clip, two straight line sides of the hair clip are 3-span 2-type hair clips, wherein 3-span 2-type hair clip means that one straight line side is on the 3 rd layer, and the other straight line side is on the 2 nd layer. The fourth numbered card issuance includes 4 for each card issuance.

The fifth numbered hairpin is a U-shaped hairpin, two straight line sides of the hairpin are 1 span 1 type, and the 1 span 1 indicates that the two straight line sides are on the 1 st layer. The fifth numbered hair clip includes 2 for each hair clip.

The sixth numbered hairpin is a U-shaped hairpin, two straight line sides of the hairpin are 8-span 8-shaped, and the 8-span 8-shaped represents that the two straight line sides are on the 8 th layer. The sixth numbered hair clip includes 1 for each hair clip.

For convenience of illustration, we name the number of branches A1^ x1, A2^ x2, A3^ x3, A4^ x4, wherein 17 hairpins in each branch are divided into 4 groups with circumference symmetry, and then named A1.1^ x1.1, A1.2^ x1.2, A1.3^ x1.3, A1.4^ x1.4 according to the direction of current flow, and so on.

The winding for a particular pin A1^ x1 shows the current flow as follows where the straight side of the hairpin is located, i.e., in a particular "slot-layer number" manner:

1-8、(7-7，13-6)、(19-5，25-4)、(31-3，37-2)、(43-1，1-1)、(43-2，37-3)、(31-4，25-5)、(19-6，13-7)、(7-8，2-8)、(8-7，14-6)、(20-5，26-4)、(32-3，38-2)、(44-1，2-1)、(44-2，38-3)、(32-4，26-5)、(20-6，14-7)、8-8。

wherein the content of the first and second substances,

positions 1-8 and 8-8 are first numbered hair clips, wherein 1-8 are current inlet ends, and 8-8 are current outlet ends.

The positions of (7-7, 13-6), (19-6, 13-7), (8-7, 14-6) and (20-6, 14-7) are all the second numbered hair clip.

The positions of (19-5, 25-4), (31-4, 25-5), (20-5, 26-4) and (32-4, 26-5) are all the third numbered hair clip.

The positions of (31-3, 37-2), (43-2, 37-3), (32-3, 38-2) and (44-2, 38-3) are all the fourth numbered hair clip.

The positions of (43-1, 1-1) and (44-1, 2-1) are the fifth numbered hair clip.

The position of (7-8, 2-8) is the sixth numbered hairpin.

Referring to the first embodiment, the twist head connection between the hairpins is performed as needed.

On the basis, the arrangement and parallel connection of 4-path hairpins are completed.

And further completes the 3-phase arrangement.

Example III,

In this embodiment, the number of layers X in each slot is equal to 9, the number of poles N is equal to 8, the number of parallel paths D is equal to 4, the same number of slots N in each pole is equal to 2, and a pitch winding, a three-phase motor, and a hybrid hairpin are taken as examples.

The difference from the second embodiment is the number of layers in each slot and the type of hairpin.

The motor adopts a full pitch winding, so that the pitch is 48/8-6.

The motor has 48 slots and 8 poles, each pole comprises 48/8-6 slots, each pair of poles comprises 12 slots, and the windings are arranged in an AAzzBBxxCCyy manner. Wherein capital letters indicate current inflow, lowercase letters indicate current outflow, phase a is a → x, phase B is B → y, and phase C is C → z.

For convenience of illustration, the number of branches is named A1^ x1, A2^ x2, A3^ x3 and A4^ x4, wherein the hairpins in each branch are divided into 4 groups with circumference symmetry, and then named A1.1^ x1.1, A1.2^ x1.2, A1.3^ x1.3, A1.4^ x1.4 and the like according to the direction of current flowing.

FIGS. 13-16 show the placement of the hairpins in branches A1^ x1, A2^ x2, A3^ x3, and A4^ x4, respectively.

Specifically, for branch A1^ x1, as shown in FIG. 13, the direction is clockwise from left to right. Arranging the hairpins as shown in the figure, and then connecting the A1.3 anticlockwise torsion head with the X1.1 clockwise torsion head, connecting the A1.2 clockwise torsion head with the X1.3 anticlockwise torsion head, and connecting the A1.4 anticlockwise torsion head with the X1.2 clockwise torsion head to finish the winding connection with the branch number of A1^ X1. And by parity of reasoning, the winding connection of the rest 3 branches is completed.

1-9、(2-8,13-7)、(19-6,25-5)、(31-4,37-3)、(43-2,1-1)、(7-1,1-2)、(43-3,37-4)、(31-5,25-6)、(19-7,13-8)、(7-9,2-9)、(8-8,14-7)、(20-6,26-5)、(32-4,38-3)、(44-2,2-1)、(8-1,2-2)、(44-3,38-4)、(32-5,26-6)、(20-7,14-8)、8-9。

Thus, each issue card is numbered, where:

the first numbered hairpin is an I-type hairpin and is positioned on the 9 th layer, and the specific positions are 1-9 and 8-9; for each hairpin, the first numbered hairpin comprises 2 hairpins and is respectively used as a current inlet end and a current outlet end of each hairpin.

The second numbered hair clip is a U-shaped hair clip, two straight line sides of the hair clip are 8-span 7-shaped, wherein 8-span 7 means that one straight line side is on the 8 th layer, and the other straight line side is on the 7 th layer. Aiming at each hairpin, the second numbered hairpins comprise 4 hairpins, and the specific positions are (2-8,13-7), (19-7,13-8), (8-8,14-7) and (20-7, 14-8).

The third numbered hair clip is a U-shaped hair clip, two straight line sides of the hair clip are 6-span 5-shaped, and the 6-span 45 represents that one straight line side is on the 6 th layer, and the other straight line side is on the 5 th layer. Aiming at each hairpin, the third numbered hairpin comprises 4 hairpins, and the specific positions are (19-6,25-5), (31-5,25-6), (20-6,26-5) and (32-5, 26-6).

The fourth numbered hairpin is a U-shaped hairpin, two straight line sides of the hairpin are 4-span 3-shaped, wherein the 4-span 3-shaped represents that one straight line side is on the 4 th layer, and the other straight line side is on the 3 rd layer. Aiming at each hairpin, the fourth numbered hairpin comprises 4 hairpins, and the specific positions are (31-4,37-3), (43-3,37-4), (32-4,38-3) and (44-3, 38-4).

The fifth numbered hairpin is a U-shaped hairpin, two straight line sides of the hairpin are 2-span 1-shaped, wherein 2-span 1 represents that one straight line side is on the 2 nd layer, and the other straight line side is on the 1 st layer. Aiming at each hairpin, the fifth numbered hairpin comprises 4 hairpins, and the specific positions are (43-2,1-1), (7-1,1-2), (44-2,2-1) and (8-1, 2-2).

The sixth numbered hairpin is a U-shaped hairpin, two straight edges of the hairpin are 9-span 9-type, and the 9-span 9-type indicates that the two straight edges are on the 9 th layer. And for each hairpin, the sixth numbered hairpin comprises 1 hairpin, and the specific positions are (7-9 and 2-9).

So 6 models and 19 haircards are totally produced.

And further completes the 3-phase arrangement.

See in particular fig. 14-20.

Example four,

In this embodiment, the number of layers X in each slot is 72 slots, the number of poles N is 8, the number of parallel paths D is 4, the same number of slots N in each pole N is 3, and a full-pitch winding, a three-phase motor, and a full-U hairpin are taken as examples.

Since the stator core has 72 slots with 8 wires per slot, the number of hairpins is 72 × 8/2 — 288 pcs.

On the basis of the above-mentioned technical scheme,

the motor is a three-phase motor, so that the number of the hairpins of each phase winding is 288/3-96 pcs.

The motor is provided with 4 parallel circuits, so that the number of the hairpins of each circuit of winding is 96/4-24 pcs.

In the motor, the pitch of the motor is 72/8-9 because the motor uses a full pitch winding. Therefore, the straight line edge of the U-shaped hairpin is generally 1^10, 2^11, 3^12, 4^13 and the like.

Furthermore, the motor is 72 slots and 8 poles, each pole comprises 72/8-9 slots, each pair of poles comprises 18 slots, and the winding is arranged in an AAAzzBBBxxxCCyyy manner. Wherein capital letters indicate current inflow, lowercase letters indicate current outflow, phase a is a → x, phase B is B → y, and phase C is C → z. See in particular fig. 21.

Because each path is 24 hair clips, each U-shaped hair clip occupies two slots, the hair clips are divided into four types of hair clips, namely 1^2, 3^4, 5^6 and 7^8 according to the layer number of the straight line edge, and each type of hair clip is 6 pcs.

For convenience of illustration, we name the number of branches A1^ x1, A2^ x2, A3^ x3, A4^ x4, wherein the 16 hairpins in each branch are divided into 4 groups with circumferential symmetry, and then named A1.1^ x1.1, A1.2^ x1.2, A1.3^ x1.3, A1.4^ x1.4, A1.5^ x1.5, A1.6^ x1.6, and the like according to the direction of current flow.

FIGS. 22-25 show the current flow in branches A1^ x1, A2^ x2, A3^ x3, and A4^ x4, respectively. The line connecting the two cells indicates that there is current flowing between the two cells.

Specifically, for branch A1^ x1, as shown in FIG. 22, the direction is clockwise from left to right. Arranging the hair clips according to the diagram, and then connecting the A1.4 anticlockwise torsion head with the x1.1 clockwise torsion head, connecting the A1.2 clockwise torsion head with the x1.4 anticlockwise torsion head, connecting the A1.5 anticlockwise torsion head with the x1.2 clockwise torsion head, connecting the A1.3 clockwise torsion head with the x1.5 anticlockwise torsion head, connecting the A1.6 anticlockwise torsion head with the x1.3 clockwise torsion head, and completing the winding connection with the branch number A1^ x1. And by parity of reasoning, the winding connection of the rest 3 branches is completed.

(1-8，10-7)、(19-6,28-5)、(37-4,46-3)、(55-2,64-1)、(1-1,64-2)、(55-3,46-4)、(37-5,28-6)、(19-7,10-8)、(2-8、11-7)、(20-6,29-5)、(38-4,47-3)、(56-2,65-1)、(2-1,65-2)、(56-3,47-4)、(38-5,29-6)、(20-4,11-8)、(3-8,12-7)、(21-6,30-5)、(39-4,48-3)、(57-2,66-1)、(3-1,66-2)、(57-3,48-4)、(39-5,30-6)、(21-7,12-8)。

And further completes the 3-phase arrangement.

See in particular fig. 21-28.

Example V,

The full-pitch winding in the above embodiments is replaced by non-full-pitch winding, such as selecting a specific pitch of 5 or 7 as required for a winding with a pitch of 6, and selecting a specific pitch of 8 or 10 as required for a winding with a pitch of 9.

Electromagnetic simulation

The circulation condition in the motor can be obtained through electromagnetic simulation.

The current of 4 parallel branches of the phase A is collected, wherein coil1 represents A1^ x1, coil1 copy represents A2^ x2, coil1 copy1 represents A3^ x3, coil1 copy2 represents A4^ x4, the ordinate circut current represents the phase current value, and the abscissa Time represents the simulation Time.

As shown in fig. 29, a phase current-time diagram obtained by simulation of a conventional motor is shown. The phase currents of A1 x1 and A3 x3 overlap, and the phase currents of A2 x2 and A4 x4 overlap. In the no-load condition, a circulating current with a peak value of about 5A appears between different branches in the same phase.

As shown in fig. 30, a phase current versus time plot obtained from a simulation of a motor using a no-circulating winding design. Under no-load working condition, only harmonic current with the peak value of about 0.0015A appears between different branches in the same phase, and no circulating current is seen.

As shown in fig. 31, a phase current-time diagram obtained by simulation of a conventional motor is shown. The phase currents of A1 x1 and A3 x3 overlap, and the phase currents of A2 x2 and A4 x4 overlap. Under load conditions, phase currents in different phases appear between different branches in the same phase, and circulating currents are formed.

As shown in fig. 32, a phase current versus time plot obtained from a simulation of a motor using a no-circulating winding design. Under the load working condition, the phase currents of different branches in the same phase are completely overlapped, the phase currents of different phases are not generated, and circulating currents are not seen.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims

1. The loop-free hairpin motor is characterized in that: all the hair clips are symmetrically and uniformly distributed around the circumference of the iron core;

each card issuing path comprises a plurality of groups, and each group of cards are sequentially connected and numbered;

2. The loop-free hairpin machine of claim 1 wherein: the current inlet end of each hairpin is arranged at the outermost layer.

3. The loop-free hairpin machine of claim 1 wherein: the current outlet end of each hairpin is arranged at the outermost layer.

4. The loop-free hairpin machine according to any one of claims 1 to 3, characterized in that: in two groups of hair clips with any adjacent numbers, two straight line edges positioned on the same layer are interconnected, the same layer is the innermost layer or the outermost layer, and the two straight line edges belong to different groups.

5. The loop-free hairpin machine according to any one of claims 1 to 3, characterized in that: in two groups of hair clips with any adjacent numbers, two straight line edges respectively positioned on the innermost layer and the outermost layer are interconnected, and the two straight line edges belong to different groups.

6. The loop-free hairpin machine according to any one of claims 1 to 3, characterized in that: in the circumferential direction, adjacent straight edges in each group of hairpins are at equal pitch or unequal pitch.

7. The loop-free hairpin machine of claim 4 wherein: defining the number of layers of each slot on the iron core as X, and P hairpin types; the P satisfies:

when X is an odd number, the P is less than or equal to (X + 3)/2;

when X is an even number, the P is less than or equal to (X + 4)/2.

8. The loop-free hairpin machine of claim 4 wherein:

the number of layers of each slot on the iron core is 8; the number of the notch layers is reduced from outside to inside according to the sequence of 8 to 1; the hairpin includes 6 types, wherein:

the first serial hairpin is an I-type hairpin and is positioned on the 8 th layer;

the second numbered hair clip is a U-shaped hair clip, two straight line sides of the hair clip are 7-span 6-shaped, the 7-span 6 represents that one straight line side is on the 7 th layer, and the other straight line side is on the 6 th layer;

the hair clip with the third number is a U-shaped hair clip, two straight line sides of the hair clip are 5-span-4 type, wherein 5-span-4 type means that one straight line side is on the 5 th layer, and the other straight line side is on the 4 th layer;

the hair clip with the fourth number is a U-shaped hair clip, two straight line sides of the hair clip are 3-span 2-type, wherein 3-span 2 means that one straight line side is on the 3 rd layer, and the other straight line side is on the 2 nd layer;

the fifth numbered hairpin is a U-shaped hairpin, two straight line sides of the hairpin are 1 span 1 type, and the 1 span 1 indicates that the two straight line sides are on the 1 st layer;

the sixth numbered hairpin is a U-shaped hairpin, two straight line sides of the hairpin are 8-span 8-shaped, and the 8-span 8-shaped represents that the two straight line sides are on the 8 th layer.

9. The loop-free hairpin machine of claim 8 wherein: and the first numbered hair clip of each hair clip comprises 2 hair clips which are respectively used as a current inlet end and a current outlet end of each hair clip.