CN114825717A

CN114825717A - Stator module and motor using same

Info

Publication number: CN114825717A
Application number: CN202210622360.XA
Authority: CN
Inventors: 汤浩; 阮鸥; 朱殿烨; 孙新东; 张增杰; 李涛
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd; Zhejiang Zeekr Intelligent Technology Co Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-07-29

Abstract

The invention provides a stator assembly and a motor using the same. The stator assembly includes: the stator core is provided with a stator slot, and the stator slot comprises a plurality of slot layers; the stator winding is inserted into the stator slot and comprises a plurality of inner layer conductors, a plurality of middle layer conductors, a plurality of outer layer conductors and a plurality of lead-out conductors; under the other magnetic poles of the branch winding, one straight line section part of the outer conductor and one straight line section part of the inner conductor have a circumferential difference of one stator slot, and the other straight line section part of the outer conductor and the other straight line section part of the inner conductor have a circumferential difference of one stator slot. The coils which are not axially nested in the coil groups at the innermost layer and the outermost layer of the winding are simple in manufacturing process, high in efficiency, few in coil form and low in production cost.

Description

Stator module and motor using same

Technical Field

The invention relates to the field of motors, in particular to a stator assembly and a motor using the same.

Background

The driving motor adopting the flat wire winding for the new energy automobile has the advantages of light weight, high power density and high efficiency, and the flat wire winding gradually becomes the development direction of the driving motor. In the prior art, the main forms of flat wire windings are the Hairpin (Hairpin) structure, the I-pin (wire segment) structure, and the continuous wave winding structure, wherein the Hairpin is the most common and mature structure. The Hairpin usually adopts a wave winding mode and a lap winding mode, and compared with the wave winding mode, the lap winding mode has the advantages that the flat wire winding is arranged in the same stator slot, the voltage difference among different layers is low, interlayer breakdown is not easy to generate, and the requirements of high-voltage driving can be better met.

However, in the flat wire winding in the lap winding manner in the prior art, one or more coils axially nested in the same layer exist in the coils in the innermost layer or the outermost layer, so that the problems of complex manufacturing process, low manufacturing efficiency, multiple coil forms, high production cost and the like of the flat wire winding are caused.

Disclosure of Invention

The invention provides a stator assembly and a motor using the same, which solve the technical problem that one or more coils which are nested in the same layer axially exist in the innermost layer or the outermost layer of the coils in the prior art, and provide the following technical scheme.

The invention proposes a stator assembly comprising:

the stator core is provided with a stator slot, and the stator slot comprises a plurality of slot layers; and

the stator winding is inserted into the stator slot and comprises a plurality of inner-layer conductors, a plurality of middle-layer conductors, a plurality of outer-layer conductors and a plurality of lead-out conductors;

in each branch of each phase winding, the inner layer conductor is connected with the middle layer conductor, the middle layer conductor is connected with the outer layer conductor, or the middle layer conductor is connected with the lead-out conductor, wherein the number of the lead-out conductors is two, the lead-out conductor comprises a straight line section part, and the number of the outer layer conductors is one less than that of the inner layer conductors; under one magnetic pole of one branch, the two lead-out conductors and one inner conductor have a circumferential difference of one stator slot, under the other magnetic poles of one branch, one linear section of the outer conductor and one linear section of the inner conductor have a circumferential difference of one stator slot, and the other linear section of the outer conductor and the other linear section of the inner conductor have a circumferential difference of one stator slot;

in each branch of each phase winding, the pitches of the inner layer conductor and the outer layer conductor are y1 and y3 in sequence, the stator slot with the circumferential phase difference between two circumferentially adjacent lead-out conductors is y4, the polar distance of the stator winding is tau, the stator slot with the circumferential phase difference between two circumferentially adjacent inner layer conductors is L1, the stator slot with the circumferential phase difference between two circumferentially adjacent outer layer conductors is L3, and the stator slot with the circumferential phase difference between the straight line segment part of the circumferentially adjacent lead-out conductor and the straight line segment part of the outer layer conductor is L4, so that the following requirements are met: y1, y4, y3, τ -1, L1, L4, τ -1, L3, τ +1, y1, y4, τ -1, y3, τ +1, L1, L4, τ +1, and L3, τ -1.

In an embodiment of the present invention, in each branch of each phase winding, two linear segments of the middle conductor are radially different by one slot layer, under each magnetic pole of one branch, one linear segment of the middle conductor and one linear segment of the inner conductor are located in the same stator slot, the other linear segment of the middle conductor and the other linear segment of the inner conductor are circumferentially different by one stator slot, a pitch of the middle conductor is y2, and a stator slot circumferentially different between two circumferentially adjacent middle conductors of the same slot layer is L2, so that: y2 τ, L2 τ -1 or L2 τ + 1.

In an embodiment of the present invention, in each branch of each phase winding, the number of radial slot layers occupied by the middle layer conductor is at least two, and under each magnetic pole of one branch, the middle layer conductors of different slot layers are located in circumferentially identical stator slots, and the radial slot layers occupied by the middle layer conductors located in circumferentially identical stator slots are not intersected with each other.

In an embodiment of the invention, in each branch of each phase winding, located in the same stator slot, the straight line segment portions of the radially adjacent middle layer conductors are radially different by two slot layers.

In an embodiment of the present invention, the lead-out conductor and the outer conductor are located in the same circumferential groove layer.

In an embodiment of the present invention, each phase winding includes at least two branches, the winding directions of the two branches of the same phase winding are opposite, and the two branch windings are connected in series or in parallel.

In one embodiment of the present invention, the lead ends of two branch windings of the same phase winding are circumferentially separated by one stator slot, when y1 is y4 is τ +1, y3 is τ -1, L1 is L4 is τ -1, and L3 is τ +1, the lead ends of the two branch windings are circumferentially separated by 2 τ -1 stator slots,

or when y1 is y4 is τ -1, y3 is τ +1, L1 is L4 is τ +1, and L3 is τ -1, the outlet ends of the two branch windings are circumferentially different by 2 τ +1 stator slots.

In an embodiment of the invention, the inner conductor of one branch is circumferentially different from the inner conductor of the other branch by one stator slot under the same magnetic pole of the same phase winding.

In an embodiment of the invention, the outer conductor of one branch is circumferentially separated from the outer conductor of the other branch by one stator slot under the same pole of the same phase winding.

The invention also provides a motor comprising any one of the stator assemblies.

The stator assembly and the motor using the same are provided by the invention, coils which are not axially nested in coil groups at the innermost layer and the outermost layer of the winding are simple in manufacturing process, high in efficiency, few in coil form and low in production cost.

Drawings

Fig. 1 is a schematic structural diagram of a stator assembly according to the present invention.

Fig. 2 is a three-dimensional schematic view of a phase winding of a stator assembly of the present invention.

FIG. 3 is an enlarged view of the invention at A in FIG. 2.

Fig. 4 is a schematic view of a first coil assembly in a stator assembly according to the present invention.

Fig. 5 is a schematic diagram of an inner conductor of a first coil assembly in a stator assembly according to the present invention.

Fig. 6 is a schematic view of a second coil assembly in a stator assembly according to the present invention.

Fig. 7 is a schematic view of a middle-layer conductor of a second coil assembly in a stator assembly according to the present invention.

Fig. 8 is a schematic diagram of the middle layer two conductor of the second coil assembly in the stator assembly according to the present invention.

Figure 9 is a schematic view of a third coil assembly of a stator assembly of the present invention.

Figure 10 is a schematic view of the outer conductor of the third coil set of the stator assembly of the present invention.

Fig. 11 is a schematic view of a fourth coil assembly of a stator assembly of the present invention.

Fig. 12 is a schematic diagram of the outgoing conductors of a fourth coil assembly of the stator assembly of the present invention.

Fig. 13 is an expanded view of a leg of a phase winding of an embodiment of a stator assembly of the present invention.

Fig. 14 is an expanded view of another leg of a phase winding of an embodiment of a stator assembly of the present invention.

Fig. 15 is a branch wiring diagram of a phase winding in an embodiment of a stator assembly of the present invention.

Fig. 16 is another branch wiring diagram of a phase winding in one embodiment of a stator assembly of the present invention.

Fig. 17 is an expanded view of a leg of a phase winding of a further embodiment of a stator assembly of the present invention.

Fig. 18 is an expanded view of another branch of a phase winding of yet another embodiment of a stator assembly in accordance with the present invention.

Fig. 19 is a branch wiring diagram of a phase winding in yet another embodiment of a stator assembly in accordance with the present invention.

Fig. 20 is another leg wiring diagram of a phase winding in yet another embodiment of a stator assembly in accordance with the present invention.

Fig. 21 is a schematic view of a star connection of a parallel branch of stator windings in a stator assembly according to the present invention.

Fig. 22 is a schematic view of a star connection of two parallel branches of stator windings in a stator assembly according to the present invention.

In the figure: 100. a stator winding; 1001. a card issuing end; 1002. welding the end;

110. a first coil group; 111. an inner layer conductor;

120. a second coil group; 121. a middle-layer first-type conductor; 122. a middle layer type II conductor;

130. a third coil group; 131. an outer conductor;

140. a fourth coil group; 141. a lead-out conductor;

101. a head portion; 102. a first straight line segment; 103. a second linear section; 104. a first bending portion; 105. a second bending portion;

200. a stator core is provided.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and functions of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Referring to fig. 1 to 22, the invention provides a stator assembly and a motor using the same, which can be applied to the fields of electric servo transmission, transportation and the like, for example, the stator assembly and the motor using the same can be applied to an electric vehicle. The invention of the application can avoid the circulation of the stator winding, reduce the loss, solve the nesting problem of a plurality of coils of the stator winding and improve the efficiency of the motor. The present invention is described in detail below with reference to specific examples.

Example one

Referring to fig. 1 to 16, a stator assembly according to the present invention includes a stator winding 100 and a stator core 200. The stator winding 100 may include a plurality of phase windings that are different in electrical phase from one another, for example, the stator winding 100 may include three phase windings. Each phase winding can comprise two branches, and the two branches can be connected in series or in parallel. The stator core 200 may be formed with a plurality of stator slots, and the stator slots may be formed on an inner wall of the stator core 200. The stator slots may be arranged in a circumferential direction of an inner wall of the stator core 200, and the stator slots may be spaced apart on the stator core 200 by a predetermined stator slot. The upper and lower end surfaces of the stator core 200 may be respectively defined as a hairpin end 1001 and a weld end 1002, the stator winding 100 may be inserted into the stator core 200 from the hairpin end 1001 side, and the stator winding 100 may be welded at the weld end 1002.

Referring to fig. 1, the plurality of stator slots may be respectively defined as a No. 1 stator slot, a No. 2 stator slot, a No. 3 stator slot, and a No. 4 stator slot … … in the circumferential direction of the stator core 200. For example, the stator core 200 may be arranged with 48 stator slots in the circumferential direction. Wherein each stator slot may be provided with a plurality of slot layers, each stator slot may be provided with an even number of slot layers, e.g. 6 slot layers. For example, the 6 slot layers may be respectively a1 st slot layer, a2 nd slot layer, a 3 rd slot layer, a 4 th slot layer, a 5 th slot layer and a 6 th slot layer in sequence along the radial direction from the inner side to the outer side of the stator core 200, that is, the 1 st slot layer may be located at a side close to the stator slot opening, and the 6 th slot layer may be located at a side close to the stator slot bottom. In addition, specific reference numbers of the slot layers of each stator slot are not limited, the slot layers are arranged from inside to outside according to the sequence of 1-6 in the embodiment of the invention, and in other embodiments, the slot layers can be arranged from outside to inside according to the sequence of 1-6.

Referring to fig. 2 to 12, the stator winding 100 may include a plurality of inner conductors 111, a plurality of middle conductors, a plurality of outer conductors 131, and a plurality of lead conductors 141. In the radial direction from the stator slot to the stator slot bottom, an inner conductor 111, a middle conductor, an outer conductor 131 may be arranged. The inner conductors 111 may form a first coil group 110, the first coil group 110 may be located in a stator slot of the stator core 200, and the first coil group 110 may be located at a side close to a stator slot opening. The plurality of middle conductors may constitute a second coil group 120, the second coil group 120 may be located in a stator slot of the stator core 200, and the second coil group 120 may be located between the first coil group 110 and the third coil group 130. The plurality of outer layer conductors 131 may constitute a third coil group 130, the third coil group 130 may be located in a stator slot of the stator core 200, and the third coil group 130 may be located at a side near a bottom of the stator slot. The plurality of lead-out conductors 141 may constitute the fourth coil group 140, the fourth coil group 140 may be located in the stator slot of the stator core 200, and the fourth coil group 140 may be located at a side near the bottom of the stator slot.

Referring to fig. 4 to 10, the inner conductor 111, the middle conductor and the outer conductor 131 may include a head portion, two straight line segments and two bending portions. Wherein, the two ends of one head part are respectively connected with a straight line section part. The two linear sections are twisted at the welding end 1002 after passing through the stator slots of the stator core 200, so as to form two bending portions. In the inner conductor 111, the middle conductor and the outer conductor 131, the bent parts of different conductors can be connected by welding, so that a complete branch can be formed. The two bent portions of the inner conductor 111, the middle conductor, and the outer conductor 131 extend along the welding end 1002 of the stator core 200 by the same distance, which may be equal to half of the pole pitch. For example, the inner conductor 111, the middle conductor, and the outer conductor 131 may include a head portion 101, a first straight section 102, a second straight section 103, a first bend 104, and a second bend 105. The first linear segment 102 and the second linear segment 103 can be used for being inserted into stator slots, and the first linear segment 102 and the second linear segment 103 can be inserted into different stator slots. A first bent portion 104 may be connected to one end of the first linear segment portion 102, and a second bent portion 105 may be connected to one end of the second linear segment portion 103. A head 101 may be connected between the other end of the first linear segment 102 and the other end of the second linear segment 103. In each branch of each phase winding, the two straight line segments of the middle conductor may be radially separated by one slot layer. In each branch of each phase winding, the two straight line segments of the inner conductor 111 may be located in circumferentially identical slot layers. In each branch of each phase winding, the two straight line segments of the outer conductor 131 may be located in circumferentially identical slot layers. Among them, the first and

third coil groups

110 and 130 may be wave windings.

Referring to fig. 6 to 8, the number of radial slot layers of the stator core 200 occupied by the third coil group 130 is not limited, and the number of radial slot layers of the stator core 200 occupied by the third coil group 130 may be an even number. For example, the number of radial slot layers of the stator core 200 occupied by the third coil group 130 may be four, i.e., the third coil group 130 may be composed of two middle-layer conductors. Because the stator core 200 is a hollow circular cylinder, for the middle layer conductors with the same pitch, the size of the middle layer conductor near the center of the circle is smaller, and the size of the middle layer conductor far away from the center of the circle is larger. The middle conductor near the center of the circle can be defined as the middle type one conductor 121, and the middle conductor far from the center of the circle can be defined as the middle type two conductor 122. The pitch of the middle-layer-one-type conductor 121 and the middle-layer-two-type conductor 122 may be the same. In each branch of each phase winding, the circumferential stator slots occupied by the middle-layer first-type conductor 121 and the middle-layer second-type conductor 122 may be the same, i.e., the first linear segment portion 102 of the middle-layer first-type conductor 121 and the first linear segment portion 102 of the middle-layer second-type conductor 122 are located in the same circumferential stator slot, and the second linear segment portion 103 of the middle-layer first-type conductor 121 and the second linear segment portion 103 of the middle-layer second-type conductor 122 are located in the same circumferential stator slot. Wherein, the symmetry axes of the middle-layer one-type conductor 121 and the middle-layer two-type conductor 122 may be the same, i.e., the third coil set 130 may be a lap-wound coil set.

Referring to fig. 4 to 10, the first bent portion 104 and the second bent portion 105 of the inner conductor 111 may extend in the same direction, for example, the extending direction of the first bent portions 104 and the second bent portions 105 may be in a clockwise direction or a counterclockwise direction. The first and second

bent portions

104 and 105 of the middle conductor may be adjacent to each other, and the first and second

bent portions

104 and 105 of the middle conductor may extend in opposite directions, for example, the first bent portions 104 may extend in a clockwise direction or a counterclockwise direction, and the second bent portions 105 may extend in opposite directions. The first and second

bent portions

104 and 105 in the outer conductor 131 may extend in the same direction, for example, the extending direction of the first and second

bent portions

104 and 105 may be in a clockwise direction or a counterclockwise direction. The extending direction of the two bent portions of the inner conductor 111, the middle conductor, and the outer conductor 131 is not particularly limited, and it is necessary to satisfy the wiring diagram shown in fig. 12 to 16.

Referring to fig. 11 to 12, the lead conductor 141 may include a head portion, a straight section portion and a bending portion. For example, the lead-out conductor 141 may include a head portion 101, a first straight portion 102, and a first bent portion 104. Wherein the first linear section 102 is adapted for insertion into a stator slot. A first bent portion 104 may be connected to one end of the first straight portion 102, and a head portion 101 may be connected to the other end of the first straight portion 102. The first bent portions 104 of the plurality of lead conductors 141 may extend in the same direction, for example, in a clockwise direction or in a counterclockwise direction. Each phase winding may include two branches, and in each branch of each phase winding, the number of the extraction conductors 141 may be two, the stator slot where the circumferentially adjacent two extraction conductors 141 are different may be y4, y4 is τ +1, and the stator slot where the straight line segment portion of the circumferentially adjacent extraction conductor 141 and the outer layer conductor 131 are different may be L4, and L4 is τ -1, where τ is the pole pitch of the stator winding 100. The two lead conductors 141 can be used as a lead terminal and a lead terminal of each branch. The bent portion of the lead conductor 141 may be equal to half of the pole pitch of the stator slot extending along the welding end 1002 side of the stator core 200.

Referring to fig. 13-16, the number of outer conductors 131 is one less than the number of inner conductors 111 in each leg of each phase winding. Under one magnetic pole of one branch, the first straight line segment part 102 of the inner layer conductor 111 is circumferentially different from one lead-out conductor 141 by one stator slot, and the second straight line segment part 103 of the inner layer conductor 111 is circumferentially different from the other lead-out conductor 141 by one stator slot. Under the remaining poles of one branch, the first linear segment 102 of the outer conductor 131 may be circumferentially offset from the first linear segment 102 of the inner conductor 111 by one stator slot, and the second linear segment 103 of the outer conductor 131 may be circumferentially offset from the second linear segment 103 of the inner conductor 111 by one stator slot. In each branch of each phase winding, the two straight line segments of the plurality of middle layer conductors may be located radially one layer apart from the slot layer. For example, the first linear segment 102 and the second linear segment 103 of the middle layer conductor may be radially offset by one slot layer. One straight section of the middle conductor and the first straight section 102 of the inner conductor 111 may be located in the same stator slot under each pole of one branch, and the other straight section of the middle conductor and the second straight section 103 of the inner conductor 111 may be circumferentially different by one stator slot.

Referring to fig. 13 to 16, in each branch of each phase, the pitch of the inner conductor 111 is y1, the pitch of the middle conductor is y2, the pitch of the outer conductor 131 is y3, the circumferential phase difference stator slot of two circumferentially adjacent inner conductors 111 is L1, the circumferential phase difference stator slot of two circumferentially adjacent middle conductors of the same slot layer is L2, and the circumferential phase difference stator slot of two circumferentially adjacent outer conductors 131 is L3, which satisfies the following conditions: y1 τ -1, y2 τ, y3 τ +1, L1 τ +1, L3 τ -1, L2 τ -1 or L2 τ + 1.

Referring to fig. 1 to 16, the head 101 of the inner conductor 111, the head 101 of the middle conductor, and the head 101 of the outer conductor 131 are located on the same side, and one end of the stator winding 100 located at the head 101 may be a hairpin end 1001. The end of the stator winding 100 located away from the head 101 may be a weld end 1002.

Referring to fig. 13 to 16, the pitch of the outer conductor 131 may be 7 stator slots, the pitch of the middle conductor may be 6 stator slots, the pitch of the inner conductor 111 may be 5 stator slots, the pole pitch τ of the stator winding 100 may be 6 stator slots, in one branch of each phase, two circumferentially adjacent outer conductors 131 differ by 5 stator slots, two circumferentially adjacent middle conductors of the same slot layer differ by 5 stator slots or by 7 stator slots, and two circumferentially adjacent inner conductors 111 differ by 7 stator slots. Two circumferentially adjacent extraction conductors 141 differ by 7 stator slots, and the circumferentially adjacent extraction conductor 141 differs by 5 stator slots from the outer conductor 131.

Referring to fig. 1 to 16, the winding structure of each phase winding of the stator winding 100 can be optimized by winding in such a winding manner that the incoming line end and the outgoing line end of each branch are arranged on the same side of the stator winding 100, and the height of the hairpin end 1001 can be fully utilized. The inlet ends of the two branches are located in the adjacent stator slots of the hairpin end 1001, so that the inlet ends of the two branches are convenient to weld. Similarly, the outgoing lines of the two branches are located at the hairpin end 1001, which facilitates welding, and at this time, the two branches are connected in parallel. In some embodiments, the two branches may be connected in series, for example, the outlet end of one branch may be connected to the inlet end of the other branch by a wire. The two branches are connected into a phase winding, the number of the branches can be adjusted, unbalanced current is not easy to generate, the circulation phenomenon can be prevented, and therefore the failure of the motor can be prevented.

Referring to fig. 1 to 16, in order to more clearly express the wiring structure of the present invention, the coil group of phase a is illustrated in the expanded winding diagram. The winding development diagram only shows the winding of the coil group of the phase A, and does not relate to the coil groups of the phase B and the phase C, the winding modes of the coil group of the phase B and the coil group of the phase C are the same as those of the coil group of the phase A, and the difference is only that the numbers of the stator slots where the wire inlet end and the wire outlet end are located are different. For example, the wire inlet ends of the phase a winding are 27 # stator slot and 28 # stator slot, the wire inlet ends of the phase B winding can be 31 # stator slot and 32 # stator slot, and the wire inlet ends of the phase C winding can be 35 # stator slot and 36 # stator slot.

Referring to fig. 1 to 16, the stator winding 100 may include three-phase windings, and each phase winding may include two branches. The following describes in detail a specific embodiment of the present invention with reference to fig. 13 to 16. For example, the number of stator slots of the stator core 200 may be, for example, 48, each branch may include 8 magnetic poles, the pole pitch of the stator winding 100 may be 6 stator slots, that is, τ is 6, the number of slots per pole and phase is 2, and the number of slot layers L of the stator winding 100 is 6. The development diagrams of the winding of the phase a, the first branch and the second branch are shown in fig. 15 and fig. 16, respectively. In fig. 15, A1X1 is a first branch of the a-phase winding, in fig. 16, A2X2 is a second branch of the a-phase winding, A1 and A2 are inlet terminals of the winding, and X1 and X2 are outlet terminals of the winding. In each stator slot of the winding development diagram, from left to right, 6 layers, 5 layers, 4 layers, 3 layers, 2 layers and 1 layer are arranged in sequence. The first branch A1X1 in fig. 15 uses reverse winding, and the second branch A2X2 in fig. 16 uses forward winding. Under the same magnetic pole of the same phase winding, the inner layer conductor 111 of one branch and the inner layer conductor 111 of the other branch are circumferentially different by one stator slot. The outer conductor 131 of one branch and the outer conductor 131 of the other branch are located in circumferentially adjacent stator slots under the same pole of the same phase winding.

Referring to fig. 13 and 15, the winding of the phase a winding first branch A1X1 is specifically performed as follows, for example, 27(6) denotes the layer 6 slot layer of the No. 27 stator slot.

A1->27(6)->33(5)->27(4)->33(3)->27(2)->33(1)->28(1)->22(2)->28(3)->22(4)->28(5)->22(6)->15(6)->21(5)->15(4)->21(3)->15(2)->21(1)->16(1)->10(2)->16(3)->10(4)->16(5)->10(6)->3(6)->9(5)->3(4)->9(3)->3(2)->9(1)->4(1)->46(2)->4(3)->46(4)->4(5)->46(6)->39(6)->45(5)->39(4)->45(3)->39(2)->45(1)->40(1)->34(2)->40(3)->34(4)->40(5)->34(6)->X1。

Referring to fig. 14 and 16, the second branch A2X2 of the phase a winding is specifically wound as follows, for example, 28(6) denotes the layer 6 slot layer of the No. 28 stator slot.

A2->28(6)->34(5)->28(4)->34(3)->28(2)->34(1)->39(1)->33(2)->39(3)->33(4)->39(5)->33(6)->40(6)->46(5)->40(4)->46(3)->40(2)->46(1)->3(1)->45(2)->3(3)->45(4)->3(5)->45(6)->4(6)->10(5)->4(4)->10(3)->4(2)->10(1)->15(1)->9(2)->15(3)->9(4)->15(5)->9(6)->16(6)->22(5)->16(4)->22(3)->16(2)->22(1)->27(1)->21(2)->27(3)->21(4)->27(5)->21(6)->X2。

Referring to fig. 12 to 16, it can be seen from the above winding manner that the lead terminals A1 and A2 of the first branch A1X1 and the second branch A2X2 have a difference of 1 stator slot in the circumferential direction. In one leg of each phase, when: y1 τ -1, y2 τ, y3 τ +1, L1 τ +1, L3 τ -1, L2 τ -1 or L2 τ +1, and when y4 τ +1 and L4 τ -1, the outlet ends of the two branch windings differ by 2 τ +1 stator slots in the circumferential direction. That is, when y1 is 5, y2 is 6, y3 is 7, L1 is 7, L3 is 5, L2 is 5 or L2 is 7, and when y4 is 7 and L4 is 5, the two windings are circumferentially separated by 13 stator slots. The lead end a1 and the outlet end X1 of the first branch are circumferentially offset by 7 stator slots. The lead end A2 and the outlet end X2 of the second branch are different by 7 stator slots in the circumferential direction; the lead terminals and the outlet terminals of the first branch and the second branch are located in the outermost coil layer. It should be noted that "phase difference" may refer to a difference between the numbers of the two stator slots, for example, a difference of 6 stator slots between the stator slot No. 3 and the stator slot No. 9. In addition, "phase difference" may also refer to the difference between two groove layers, for example, a 3 groove layer difference between a1 st groove layer and a 4 th groove layer.

Example two

Referring to fig. 1 to 12 and fig. 17 to 20, in another embodiment of the present invention, in each branch winding of each phase, the pitch of the inner conductor 131 is y1, the pitch of the middle conductor is y2, the pitch of the outer conductor 111 is y3, the pole pitch of the stator winding 100 is τ, the circumferential phase difference stator slot of two circumferentially adjacent inner conductors 111 is L1, the circumferential phase difference stator slot of two circumferentially adjacent middle conductors of the same slot layer is L2, and the circumferential phase difference stator slot of two circumferentially adjacent outer conductors 131 is L3, which satisfies the following conditions: y1 τ +1, y2 τ, y3 τ -1, L1 τ -1, L3 τ +1, L2 τ -1 or L2 τ + 1. The circumferentially-different stator slot of two circumferentially adjacent lead-out conductors 141 may be y4, where y4 is τ -1, and the circumferentially-different stator slot of the straight segment portion of the circumferentially adjacent lead-out conductor 141 and the outer conductor 131 may be L4, and L4 is τ + 1.

Referring to fig. 1 to 12 and 17 to 20, for example, the number of stator slots of the stator core 200 may be, for example, 48, each branch may include 8 magnetic poles, the pole pitch of the stator winding 100 may be 6 stator slots, and the number of slots per phase of each pole is 2. At this time, in one branch of each phase, the pitch of the outer conductor 131 is 5 stator slots, the pitch of the middle conductor is 6 stator slots, the pitch of the inner conductor 111 is 7 stator slots, two circumferentially adjacent outer conductors 131 differ by 7 stator slots, two circumferentially adjacent middle conductors of the same slot layer differ by 5 stator slots or by 7 stator slots, and two circumferentially adjacent inner conductors 111 differ by 5 stator slots. Two circumferentially adjacent extraction conductors 141 have a circumferential difference of 5 stator slots, and the circumferentially adjacent extraction conductors 141 and the outer conductor 131 have a circumferential difference of 7 stator slots.

Referring now to FIGS. 17-20, in some embodiments, embodiments of the present invention are described in detail. The motor winding method of three-phase 8-pole 48 stator slots with 6 wires per stator slot is taken as an example for explanation. The development of the first and second branches of the winding of phase a are shown in fig. 19 and 20, respectively. In fig. 19, A1X1 is a first branch of the a-phase winding, in fig. 20, A2X2 is a second branch of the a-phase winding, A1 and A2 are inlet terminals of the winding, and X1 and X2 are outlet terminals of the winding. In each stator slot of the winding development diagram, from left to right, 6 layers, 5 layers, 4 layers, 3 layers, 2 layers and 1 layer are arranged in sequence. The first branch A1X1 in fig. 19 uses the forward winding and the second branch A2X2 in fig. 20 uses the reverse winding.

Referring to fig. 17 and 19, in some embodiments, the winding of the first branch A1X1 of the phase a winding is as follows:

A1->27(6)->33(5)->27(4)->33(3)->27(2)->33(1)->40(1)->34(2)->40(3)->34(4)->40(5)->34(6)->39(6)->45(5)->39(4)->45(3)->39(2)->45(1)->4(1)->46(2)->4(3)->46(4)->4(5)->46(6)->3(6)->9(5)->3(4)->9(3)->3(2)->9(1)->16(1)->10(2)->16(3)->10(4)->16(5)->10(6)->15(6)->21(5)->15(4)->21(3)->15(2)->21(1)->28(1)->22(2)->28(3)->22(4)->28(5)->22(6)->X1。

referring to fig. 18 and 20, in some embodiments, the winding of the second branch A2X2 of the phase a winding is as follows:

A2->28(6)->34(5)->28(4)->34(3)->28(2)->34(1)->27(1)->21(2)->27(3)->21(4)->27(5)->21(6)->16(6)->22(5)->16(4)->22(3)->16(2)->22(1)->15(1)->9(2)->15(3)->9(4)->15(5)->9(6)->4(6)->10(5)->4(4)->10(3)->4(2)->10(1)->3(1)->45(2)->3(3)->45(4)->3(5)->45(6)->40(6)->46(5)->40(4)->46(3)->40(2)->46(1)->39(1)->33(2)->39(3)->33(4)->33(5)->33(6)->X2。

from the above winding manner, the lead terminals A1 and A2 of the first branch A1X1 and the second branch A2X2 are different by 1 stator slot in the circumferential direction. When y1 is τ +1, y2 is τ, y3 is τ -1, L1 is τ -1, L3 is τ +1, L2 is τ -1 or L2 is τ +1, and when y4 is τ -1 and L4 is τ +1, the outlet ends of the two branch windings differ by 2 τ -1 stator slots in the circumferential direction. That is, when y1 is 7, y2 is 6, y3 is 5, L1 is 5, L3 is 7, L2 is 5, or L2 is 7, and when y4 is 5 and L4 is 7, the outlet ends of the two branch windings are circumferentially separated by 11 stator slots. The difference between the circumferential direction of the lead end A1 and the circumferential direction of the outlet end X1 of the first branch is 5 stator slots, and the difference between the circumferential direction of the lead end A2 and the circumferential direction of the outlet end X2 of the second branch is 5 stator slots; the lead terminals and the outlet terminals of the first branch and the second branch are located in the outermost coil layer.

Referring to fig. 21-22, in some embodiments, the bent portions of the coil sets are welded to each other at the welding ends 1002 to form the a-phase winding. As shown in fig. 21, two branches of the a-phase winding may form one parallel branch by being connected in series. As shown in fig. 22, two branches of the a-phase winding may be connected in parallel to form two parallel branches, which illustrates the star connection between the three-phase windings. When the first branch and the second branch are arranged in parallel, the incoming line end A1 is connected with the incoming line end A2, and the outgoing line end X1 is connected with the outgoing line end X2, so that the first branch and the second branch are connected in parallel with each other.

The invention solves the problem of nesting of a plurality of coils of the stator winding 100, and through the arrangement of the windings, the coils which are axially nested are not arranged in the innermost and outermost coil groups of the winding, the manufacturing process is simple, the efficiency is high, the coil forms are few, and the production cost is low. In addition, the two parallel branches are completely symmetrical on the magnetic circuit, the electrical parameters such as resistance, inductance and the like are completely equal, and no circulating current exists between the branches after the two branches are connected in parallel, so that the efficiency of the motor is improved, and the vibration and the noise of the motor are reduced. And the conductor of each stator slot belongs to the conductor of a certain phase, so that interlayer insulating paper is eliminated, the slot filling rate of the winding stator slot is increased, and the motor efficiency is further improved.

Referring to fig. 1 to 22, in an embodiment, the present invention further provides a motor, which may include the stator assembly described above.

In summary, the present invention provides a stator assembly and a motor using the same. The invention solves the problem of nesting of a plurality of coils of the stator winding, and through the arrangement of the windings, the coils which are not nested axially in the innermost and outermost coil groups of the winding have simple manufacturing process, high efficiency, few coil forms and low production cost.

The systems and methods have been described herein in general terms as the details aid in understanding the invention. Furthermore, various specific details have been given to provide a general understanding of the embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Thus, although the present invention has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of the invention will be employed without a corresponding use of other features without departing from the scope and spirit of the invention as set forth. Thus, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present invention. It is intended that the invention not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention is to be determined solely by the appended claims.

Claims

1. A stator assembly, comprising:

in each branch of each phase winding, the inner layer conductor is connected with the middle layer conductor, the middle layer conductor is connected with the outer layer conductor, or the middle layer conductor is connected with the lead-out conductors, the number of the lead-out conductors is two, each lead-out conductor comprises a straight line section, and the number of the outer layer conductors is one less than that of the inner layer conductors;

under one magnetic pole of one branch, the two lead-out conductors and one inner conductor have a circumferential difference of one stator slot, under the other magnetic poles of one branch, one linear section of the outer conductor and one linear section of the inner conductor have a circumferential difference of one stator slot, and the other linear section of the outer conductor and the other linear section of the inner conductor have a circumferential difference of one stator slot;

2. The stator assembly of claim 1, wherein in each leg of each phase winding, two linear segments of the middle conductor are radially offset by one slot layer, one linear segment of the middle conductor is located in the same stator slot as one linear segment of the inner conductor, the other linear segment of the middle conductor is circumferentially offset by one stator slot from the other linear segment of the inner conductor for each pole of one leg, the pitch of the middle conductor is y2, and two circumferentially adjacent stator slots of the same slot layer are circumferentially offset by L2, such that: y2 τ, L2 τ -1 or L2 τ + 1.

3. The stator assembly of claim 2 wherein the radial slot layers occupied by the middle layer conductors are at least two in each leg of each phase winding, the middle layer conductors of different slot layers being located in circumferentially identical stator slots at each pole of one leg, the radial slot layers occupied by the middle layer conductors located in circumferentially identical stator slots being non-intersecting.

4. The stator assembly of claim 3 wherein in each leg of each phase winding, within the same stator slot, the straight segments of radially adjacent middle layer conductors are radially separated by two slot layers.

5. The stator assembly of claim 1 wherein the exit conductor is located in the same circumferential slot layer as the outer conductor.

6. The stator assembly of claim 1, wherein each phase winding comprises at least two branches, the two branches of the same phase winding are wound in opposite directions, and the two branch windings are connected in series or in parallel.

7. The stator assembly of claim 6, wherein the lead ends of the two branch windings of the same phase winding are circumferentially separated by one stator slot, and when y1 is y4 is τ +1, y3 is τ -1, L1 is L4 is τ -1, and L3 is τ +1, the lead ends of the two branch windings are circumferentially separated by 2 τ -1 stator slots,

8. The stator assembly of claim 6 wherein the inner conductor of one leg is circumferentially offset from the inner conductor of another leg by one stator slot at the same pole of the same phase winding.

9. The stator assembly of claim 6 wherein the outer conductor of one leg is circumferentially offset from the outer conductor of another leg by one stator slot at the same pole of the same phase winding.

10. An electrical machine comprising a stator assembly according to any of claims 1 to 9.