CN117294037A - Stator assembly and manufacturing and winding method thereof - Google Patents

Abstract

A stator assembly includes a stator core, a first insulating frame, and a plurality of conductive terminals. The stator core is provided with a first end face and a second end face which are opposite to each other. The first insulating framework is formed on the first end face and provided with a plurality of first arc-shaped sheets and a plurality of second arc-shaped sheets which extend and protrude out of the first end face, and at least one of the first arc-shaped sheets is provided with a first reference positioning feature. The conductive terminals are arranged on the end parts of a plurality of the first arc-shaped sheets.

Description

Stator assembly and manufacturing and winding method thereof

Technical Field

The invention relates to a stator assembly and a manufacturing and winding method thereof.

Background

In the existing stator assembly manufacturing method, in the wire winding step of the wire harness with the wire wound, manual wire twisting and welding are needed, and the manufacturing process is tedious and time-consuming. The lead-out wire harness needs to be reserved for a certain length, and a terminal needs to be additionally welded to be electrically connected with the outside, so that unnecessary waste of the wire harness and the risk of abrasion and skin breakage of the wire harness are caused. In view of this, stator assembly manufacturers are actively looking for automated stator assembly manufacturing schemes, which more effectively reduce the labor cost and avoid the risk of wire harness wear and tear.

Disclosure of Invention

The invention provides a stator assembly and a manufacturing and winding method thereof, which solve the problems in the prior art.

According to an embodiment of the invention, a stator assembly includes a stator core, a first insulating frame, and a plurality of conductive terminals. The stator core is provided with a first end face and a second end face which are opposite to each other. The first insulating framework is formed on the first end face and provided with a plurality of first arc-shaped sheets and a plurality of second arc-shaped sheets which extend and protrude out of the first end face, and at least one of the first arc-shaped sheets is provided with a first reference positioning feature. The conductive terminals are arranged on the end parts of a plurality of the first arc-shaped sheets.

According to an embodiment of the present invention, a stator assembly manufacturing method includes: integrally encapsulating and molding a first insulating framework and a stator core, and forming a first reference positioning feature in the first insulating framework; embedding a plurality of positive conductive terminals and a plurality of negative conductive terminals into the first insulating skeleton according to the position of the first reference positioning feature; sequentially winding a plurality of coils and extending a plurality of connecting wires in the stator core according to the positions of the first reference positioning features; welding the wire heads of the connecting wires to the corresponding positive conductive terminals and negative conductive terminals; and penetrating the positive conductive terminals into a circuit board.

According to an embodiment of the present invention, a winding method for a stator assembly is provided for winding three U-phase coils, three V-phase coils and three W-phase coils on three U-phase, three V-phase and three W-phase winding slots of the stator core, wherein one of the three U, V, W-phase winding slots respectively forms a first group, a second group and a third group, the winding method includes: judging the position of the U-phase wire winding groove of the first group according to the position of the first reference positioning feature; sequentially (1) winding a U-phase coil in the U-phase winding grooves of the first group in a line-to-bottom mode; (2) Winding a V-phase coil on the winding groove of the V-phase of the first group; (3) Winding a V-phase coil on the winding groove of the V-phase of the second group; (4) A U-phase coil is wound on the winding groove of the U-phase of the second group; (5) A U-phase coil is wound on the winding groove of the U-phase of the third group; (6) Winding a W phase coil to the winding groove of the W phase of the second group; (7) Winding a W-phase coil on the winding groove of the W phase of the first group; (8) Winding a V-phase coil on the winding groove of the V-phase of the third group; and (9) winding the W-phase coil around the W-phase winding slots of the third group.

In summary, the stator assembly design, the manufacturing method and the winding method of the present invention provide a stator assembly design more suitable for the automated production, and plastic is encapsulated in the stator core by using the injection molding process to form the insulation framework. A plurality of arc-shaped pieces which are beneficial to automatic winding extend out of the insulating framework, and a wire arranging groove is reserved between the arc-shaped pieces, so that the winding direction can be switched. When the stator assembly is applied to a plurality of groups of coils connected in parallel, the winding between at least two coils in the same phase is performed in a continuous winding mode, so that the subsequent steps of wiring and welding are reduced, and the manufacturing time and cost can be effectively reduced.

The following description will make detailed description of the above description in terms of embodiments, and provide further explanation of the technical solution of the present invention.

Drawings

The foregoing and other objects, features, advantages and embodiments of the invention will be apparent from the following description taken in conjunction with the accompanying drawings in which:

FIG. 1 illustrates an exploded view of a stator assembly of an embodiment of the present invention;

fig. 2 shows a perspective view of a stator core of an embodiment of the present invention;

fig. 3 is a perspective view showing a stator core according to an embodiment of the present invention after an insulating frame is wrapped around the stator core;

fig. 4 shows a top view of the stator core of fig. 3 encasing an insulating framework;

fig. 5 illustrates a bottom view of the stator core encasing insulation framework of fig. 3;

FIG. 6 illustrates a perspective view of a stator assembly with a circuit board removed in accordance with an embodiment of the present invention;

fig. 7 shows a perspective view of a positive conductive terminal of an embodiment of the present invention;

fig. 8 shows a perspective view of a negative conductive terminal of an embodiment of the present invention;

FIG. 9 illustrates a perspective view of a stator assembly of an embodiment of the present invention in combination;

FIG. 10 illustrates a flow chart of a method of manufacturing a stator assembly in accordance with an embodiment of the present invention;

fig. 11 shows a schematic plan view of a stator core of an embodiment of the present invention; and

fig. 12 shows a schematic diagram of a stator core winding in accordance with an embodiment of the present invention.

Reference numerals illustrate:

100 stator assembly

102 second insulating skeleton

104 slotted hole

105 second reference locator feature

106 slotted hole

107 wire arranging ditch

110 stator core

110a end face

110b end face

111a tooth

111b tooth slot

112 first insulating skeleton

112a arc-shaped sheet

112b arc-shaped sheet

112c arc-shaped sheet

113 winding groove

114 coil

115 first reference positioning feature

116 connecting line

117 wire arranging ditch

118 conductive terminal

118a positive conductive terminal

118a1 lower half

118a2 upper half

118b negative conductive terminal

119a terminal hook

119b embedded foot

119c terminal hook

119d embedding feet

119e tip end

119f shoulder

120 circuit board

122 power distribution socket

150 rotor accommodation space

200 method

202-210 steps

AX axial direction

Height H

h height of

R is radial

T thickness of

t is thickness

U, V, W phase position

G1, G2, G3 group

Detailed Description

For a more complete and thorough description of the present invention, reference is made to the accompanying drawings and the various embodiments described below, wherein like reference numbers represent the same or similar elements. In other instances, well-known elements and steps have not been described in detail in order to not unnecessarily obscure the present invention. In the description and claims, unless the context clearly dictates otherwise, the terms "a" and "an" may refer to either a single or multiple.

Referring to fig. 1, an exploded view of a stator assembly according to an embodiment of the invention is shown. The stator assembly 100 includes a stator core 110, a first insulating frame 112, a second insulating frame 102, a plurality of coils 114, a plurality of connecting wires 116, a plurality of conductive terminals 118, and a circuit board 120. The coils 114 are wound in the stator core 110, and the connecting wires 116 extend out to wind on the first insulating frame 112. A plurality of conductive terminals 118 are embedded on the first insulating skeleton 112. The wire ends of the connecting wires 116 are soldered to the corresponding conductive terminals. The longer of the conductive terminals 118 is threaded through the circuit board 120 of the encoder.

Referring to fig. 2 and 3, fig. 2 is a perspective view of a stator core 110 according to an embodiment of the invention, and fig. 3 is a perspective view of a stator core Bao She according to an embodiment of the invention after a first insulating frame 112 and a second insulating frame 102. The annular stator core 110 has opposite end surfaces 110a and 110b. The stator core 110 has teeth 111a arranged at intervals in a ring shape, and tooth grooves 111b are formed between adjacent teeth 111 a. The plurality of teeth 111a define a rotor housing 150. In some embodiments of the present invention, the stator core 110 may be formed by stacking a plurality of silicon steel sheets. The stator core 110, the first insulating frame 112, and the second insulating frame 102 are integrally injection-molded. In detail, the stator core 110 is disposed in a single mold through an integral injection process, and plastic is injected into the single mold to form the first insulating frame 112 and the second insulating frame 102. The stator core 110 is dug with a plurality of slots 104, which can increase the contact surface area between the injected plastic (i.e. the first insulating frame 112 and the second insulating frame 102) and the stator core 110, so as to improve the bonding strength of the heterogeneous materials. It is noted that the structures of the first insulating skeleton 112 and the second insulating skeleton 102 are different; the first insulating skeleton 112 is formed on the end face 110a, and the second insulating skeleton 102 is formed on the end face 110b. That is, the present invention forms the first insulating frame 112 and the second insulating frame 102 having two different structures on the two end surfaces 110a and 110b of the stator core 110 through an integral injection process. In this way, the present invention does not need to use two molds to manufacture the first insulating frame 112 and the second insulating frame 102 respectively, and does not need to combine the stator core 110, the first insulating frame 112 and the second insulating frame 102 by an additional method (such as adhesion, clamping, locking), so that the manufacturing time and the manufacturing cost can be effectively reduced.

The first insulating frame 112 is wrapped on the tooth 111a and the tooth slot 111b to form a plurality of winding slots 113. The first insulating frame 112 includes a plurality of arc-shaped pieces 112a and 112b protruding from the end face 110a of the stator core 110, and the second insulating frame 102 includes a plurality of arc-shaped pieces 112c protruding from the end face 110b of the stator core 110. The length of the arc piece 112b is longer and the length of the arc piece 112a is shorter in the axial direction AX of the stator core 110. In some embodiments of the present invention, the longer arcuate pieces 112b and the shorter arcuate pieces 112a alternate with each other, and the gaps between adjacent longer arcuate pieces 112b and shorter arcuate pieces 112a form wire-arranging grooves 117 when winding. In some embodiments of the present invention, the arc-shaped pieces 112c of the second insulating frame 102 formed on the end face 110b of the stator core 110 are of equal length; in the axial direction AX of the stator core 110, the length of the arc piece 112c is shortest as compared to the arc pieces 112a, 112 b; and the gap between the two arcuate pieces 112c forms the wire arranging groove 107. The longer arc-shaped pieces 112b and the shorter arc-shaped pieces 112a are alternately arranged with each other, and the wire arranging grooves 117 are matched, so that the connecting wire 116 can have a more elastic and convenient wire arranging mode, and the automatic wire winding and arranging execution is facilitated.

The arcuate piece (the shorter arcuate piece 112a is taken as an example of the present embodiment, but not limited thereto) of the first insulating frame 112 is formed with a first reference positioning feature 115, and the arcuate piece 112c of the second insulating frame 102 is formed with a second reference positioning feature 105. In some embodiments of the present invention, the first reference positioning feature 115 and the second reference positioning feature 105 are a groove, and the structure of the groove is different from that of the other arc-shaped pieces, so that the structure of the reference positioning feature can be detected by the automatic winding device through fixture clamping or image recognition, so as to realize automatic positioning and automatic winding.

Referring to fig. 4 and 5, fig. 4 is a top view of the stator core-encased insulating frame of fig. 3, and fig. 5 is a bottom view of the stator core-encased insulating frame of fig. 3. The rotor accommodating space 150 has a regular nine-sided shape, wherein the number of teeth 111a is nine. The arcuate tab 112b is formed at the vertex of the regular nonagon, which is an arc angle, and the arcuate tab 112a is formed at the midpoint of the edge of the regular nonagon. It should be noted that the rotor housing space 150 is of a regular nine-sided design to make the thickness of the winding slot 113 uniform in the radial direction R, so that the number of turns of the coil 114 wound on each layer is approximately equal. If the rotor receiving space 150 is circular and the winding groove 113 takes an arc shape, the number of turns wound by the coil 114 in the outer layer is smaller because of the smaller thickness in the radial direction R. On one side of the end face 110a, in the radial direction R of the stator core 110, the shorter arcuate piece 112a has a larger thickness T, and the longer arcuate piece 112b has a smaller thickness T. Shorter arcuate tabs 112a having a greater thickness T facilitate the addition of reference locating features or embedding conductive terminals thereon. On one side of the end face 110b, the arcuate pieces 112c have the same or substantially the same length, but still have a greater thickness T and a smaller thickness T. The arc-shaped sheets having a larger thickness T and the arc-shaped sheets having a smaller thickness T are alternately arranged with each other, and the gaps between the adjacent arc-shaped sheets form a wire arranging groove 107. Arcuate tabs 112c having a greater thickness T facilitate the addition of the second reference locating feature 105 or embedding of conductive terminals thereon. In some embodiments of the present invention, the first reference locating feature 115 is located on the outer side wall of the arcuate tab 112a having the greater thickness T and the second reference locating feature 105 is located on the outer side wall of the arcuate tab 112c having the greater thickness T (i.e., the side wall of the arcuate tab facing away from the rotor receiving space 150). In some embodiments of the present invention, the first reference locating feature 115 and the second reference locating feature 105 are not aligned with each other in the axial direction AX of the stator core 110. In one embodiment, the wire management grooves 117, 107 are not aligned with each other in the axial direction AX of the stator core 110.

Referring to fig. 6, 7 and 8, fig. 6 is a perspective view of a stator assembly with a circuit board removed, fig. 7 is a perspective view of a positive conductive terminal, and fig. 8 is a perspective view of a negative conductive terminal. Fig. 6 removes the circuit board to clearly show a state in which the plurality of conductive terminals 118 are embedded in the arc-shaped pieces. The conductive terminals 118 include a plurality of positive conductive terminals 118a and a plurality of negative conductive terminals 118b. In the axial direction of the stator core 110, the positive conductive terminal 118a has a longer height H, and the negative conductive terminal 118b has a shorter height H. The positive conductive terminal 118a and the negative conductive terminal 118b are embedded in the shorter arc-shaped piece 112a with a larger thickness, thereby being more firmly positioned on the first insulating frame 112. Two adjacent conductive terminals (118 a or 118 b) each have a longer arcuate segment 112b therebetween for electrical isolation.

As shown in fig. 7, the positive conductive terminal 118a has a lower half 118a1 and an upper half 118a2, and the upper half 118a2 extends upward from the top edge of the lower half 118a1 and deflects toward the rotor accommodating space 150. The reason why the positive conductive terminal 118a deflects toward the rotor accommodating space 150 is to increase the distance between the positive conductive terminal 118a and the housing of the stator assembly 100 (in the radial R direction), so as to avoid the electromagnetic coupling effect caused by the excessive approach of the positive conductive terminal 118a and the housing, thereby ensuring that the stator assembly 100 meets the electromagnetic compatibility test formulated by the safety regulations. The upper half 118a2 of the positive conductive terminal 118a has a top end 119e and two shoulders 119f. The top 119e is inserted into a corresponding connection hole of the circuit board, and the two shoulders 119f are used for bearing the circuit board. The lower half 118a1 has a terminal hook 119a and two insert pins 119b; two slots 106 are formed in the arc-shaped piece 112a of the first insulating frame 112, into which the two insertion pins 119b can be inserted. In some embodiments of the present invention, each of the plurality of arcuate tabs 112a is formed with two slots 106 to accommodate a variety of stator assembly specifications. Alternatively, two slots 106 are formed on a specific one of the plurality of arcuate pieces 112a to avoid incorrect assembly; for example, six specific arc pieces 112a are formed with two slots, three of positive conductive terminals 118a electrically connected to the three-phase power supply, respectively, are embedded in the three specific arc pieces 112a, and three of negative conductive terminals 118b electrically connected to the neutral or ground, respectively, are embedded in the other three specific arc pieces 112a. The terminal hooks 119a are used for arranging wires and integrating the wire ends of the connecting wires 116 corresponding to the positive conductive terminals 118a, and then pressing and welding are performed to electrically connect the positive conductive terminals and the corresponding wire ends of the connecting wires 116. The terminal hook is used for being jointed with a welding mode to be matched with connecting wires with different wire diameters, so that the existing method for stripping or puncturing insulating covers of the connecting wires is avoided. In some embodiments of the present invention, positive conductive terminal 118a is an integrally formed piece of metal.

As shown in fig. 8, the negative conductive terminal 118b also has a terminal hook 119c and two embedded pins 119d, but does not have the upper half 118a2 of the positive conductive terminal 118 a. The terminal hooks 119c are used for arranging wires and integrating the wire ends of the connecting wires 116 corresponding to the negative conductive terminals 118b, and then pressing and welding are performed to electrically connect the negative conductive terminals 118b and the wire ends of the connecting wires 116. The two insertion pins 119d are used for being inserted into the two slots 106 of the arc-shaped piece 112a of the first insulating frame 112. In some embodiments of the present invention, negative conductive terminal 118b is an integrally formed piece of metal.

Referring to fig. 9, a perspective view of a stator assembly 100 of an embodiment of the present invention is shown in combination. The stator assembly 100 in this figure is the assembled state of the stator assembly components of fig. 1. As shown in fig. 7, the top 119e of each positive conductive terminal 118a is inserted into the corresponding connecting hole 120a of the circuit board 120 of the encoder, and then the positive conductive terminal 118a is soldered to the connecting hole 120a, so as to achieve the purpose of electrical connection and fixation. The two shoulders 119f of each positive conductive terminal 118a are abutted against the bottom surface of the circuit board 120, thereby carrying the circuit board 120. In some embodiments of the present invention, the circuit board 120 is also circular, and its diameter is similar to that of the end face 110a of the stator core 110, so that the whole stator assembly 100 can occupy less space. In one embodiment, an electrical outlet 122 is disposed on the circuit board 120 for three-phase power input to the motor.

Referring to fig. 10, a flow chart of a method 200 of manufacturing a stator assembly in accordance with an embodiment of the present invention is shown. In step 202 (please refer to fig. 2 and 3 simultaneously), the first insulating frame 112 and the second insulating frame 102 are integrally molded in the stator core 110, and the first reference positioning feature 115 is formed in the arc-shaped piece of the first insulating frame 112 and the second reference positioning feature 105 is formed in the arc-shaped piece of the second insulating frame 102. In some embodiments of the present invention, the first reference locating feature 115 is formed on the outer sidewall of the arcuate tab 112a having a greater thickness and the second reference locating feature 105 is formed on the outer sidewall of the arcuate tab 112 c. In some embodiments of the present invention, the first and second reference locating features 115, 105 are a recess that allows the automatic winding apparatus to physically or graphically detect the recess configuration of the reference locating features.

In step 204 (please refer to fig. 6-8 simultaneously), a plurality of positive conductive terminals 118a and a plurality of negative conductive terminals 118b are embedded into the top ends of the arc-shaped pieces 112a of the first insulating frame 112 using a robotic arm according to the position of at least one of the first reference positioning feature 115 and the second reference positioning feature 105. In some embodiments of the present invention, the positive conductive terminal 118a has a longer height and the negative conductive terminal 118b has a shorter height in the axial direction of the stator core 110. Both the positive conductive terminal 118a and the negative conductive terminal 118b are embedded in a shorter arc-shaped piece 112a having a larger thickness.

In step 206 (please refer to fig. 1, 11, 12), a plurality of coils 114 are sequentially wound in the stator core 110 and a plurality of connecting wires 116 are extended according to the position of at least one of the first reference positioning feature 115 and the second reference positioning feature 105. Taking the 9 slot 3 phase stator core of the present embodiment as an example, after the automatic winding device detects the position of the first reference positioning feature 115, a plurality of coils are sequentially wound on the 9 slots by using a mechanical arm according to the pre-loaded sequence. Referring to fig. 11 and 12, the coils include three first phase coils (e.g., U-phase coils), three second phase coils (e.g., V-phase coils), and three third phase coils (e.g., W-phase coils). The next U, V, W winding slots among the plurality of winding slots of the U, V, W phase on the stator core 110 respectively form G1 group, G2 group, and G3 group. For example, the automatic winding apparatus can wind a plurality of U, V, W phase coils from the In (positive) point to the Out (positive) point In order of the U, V, W phase winding slots 113 of the stator core In a line-to-line manner according to the order of 1-9 listed In fig. 12 to achieve 3Y line connection. For example, (1) a U-phase coil is wound around a U-phase winding slot of the G1 group, (2) a V-phase coil is wound around a V-phase winding slot of the G1 group, (3) a V-phase coil is wound around a V-phase winding slot of the G2 group, (4) a U-phase coil is wound around a U-phase winding slot of the G2 group, (5) a U-phase coil is wound around a U-phase winding slot of the G3 group, (6) a W-phase coil is wound around a W-phase winding slot of the G2 group, (7) a W-phase coil is wound around a W-phase winding slot of the G1 group, (8) a V-phase coil is wound around a V-phase winding slot of the G3 group, and (9) a W-phase coil is wound around a W-phase winding slot of the G3 group. The above-mentioned exemplary one-wire-to-one winding method includes several continuous winding steps crossing groups in the same phase, for example, the above-mentioned (2) to (3), the above-mentioned (4) to (5) and the above-mentioned (6) to (7), and these continuous winding steps crossing groups in the same phase are used for reducing the subsequent steps of wire connection and welding, so that the manufacturing man-hour and the manufacturing cost can be effectively reduced.

In the winding embodiment of fig. 12, the wire is cut twice after the wire is wound to the bottom (e.g., the position of the scissors is shown) to meet the predetermined line requirements. Specifically, the position of a pair of scissors is shown to cut the connection line connecting the W phase coil of the G1 group and the V phase coil of the G3 group, and to weld the wire end of the W phase coil of the G1 group to the connection line (here, the negative electrode or the ground portion) connecting the U, V phase coils of the G1 group. The position of the other scissors shows cutting the connection line connecting the W phase coil of the G2 group and the U phase coil of the G3 group, welding the wire ends of the W phase coil of the G2 group to the connection line (here, the negative electrode or the ground portion) connecting the U, V phase coil of the G2 group, and welding the wire ends of the U phase coil of the G3 group to the connection line (here, the positive electrode) connecting the V, W phase coil of the G3 group.

In addition, the two winding grooves connected by the same-phase cross-group continuous winding are opposite in winding direction, and if one winding groove is used for winding clockwise, the other winding groove is used for winding anticlockwise. For example, in the winding steps (2) to (3), the winding grooves of the V phase of the G1 group are wound with the coil counterclockwise, but when the winding grooves of the V phase of the G2 group are continuously wound across the group, the winding grooves are wound with the coil clockwise; in the winding steps (4) to (5), the U-phase winding slot of the G2 group is wound with the coil counterclockwise, but when the U-phase winding slot of the G3 group is continuously wound across the group, the U-phase winding slot of the G2 group is wound with the coil clockwise; in the winding steps (6) to (7), the winding grooves of the W phase of the G2 group are wound with the coil counterclockwise, but when the winding grooves of the W phase of the G1 group are continuously wound across the groups, the winding grooves are wound with the coil clockwise. Each winding slot 113 of U, V, W phase has aligned arcuate segments 112a, and arcuate segments 112b are located between adjacent winding slots 113 and have wire-arranging grooves 117 therebetween. Therefore, the clockwise or anticlockwise winding coil can easily switch the winding direction through the arc-shaped sheet and the wire arranging groove.

In step 208 (please refer to fig. 9, 11, and 12), the connecting wires 116 are soldered to the corresponding positive conductive terminals 118a and negative conductive terminals 118b to achieve a plurality of Y-lines connected in parallel around the coils of the stator core 110.

In step 210 (please refer to fig. 1 and fig. 9 simultaneously), the top ends 119e of the positive conductive terminals 118a are inserted into the corresponding connection holes 120a of the circuit board 120, so as to electrically connect the positive conductive terminals 118a with the circuit board 120.

The invention provides a stator assembly design, a manufacturing method and a winding method thereof, which are more suitable for leading-in automatic production, wherein plastic is wrapped in a stator core by using an injection molding process to form an insulating framework. A plurality of arc-shaped pieces which are beneficial to automatic winding extend out of the insulating framework, and a wire arranging groove is reserved between the arc-shaped pieces, so that the winding direction can be switched. When the stator assembly is applied to a plurality of groups of coils connected in parallel, the winding between at least two coils in the same phase is performed in a continuous winding mode, so that the subsequent steps of wiring and welding are reduced, and the manufacturing time and cost can be effectively reduced.

While the present invention has been described with reference to the embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the following claims.

Claims (20)

1. A stator assembly, comprising:

a stator core having opposite first and second end faces;

the first insulation framework is formed on the first end face and provided with a plurality of first arc-shaped sheets and a plurality of second arc-shaped sheets which extend and protrude out of the first end face, and at least one of the first arc-shaped sheets is provided with a first reference positioning feature; and

and the plurality of conductive terminals are arranged on the end parts of a plurality of the first arc-shaped sheets.

2. The stator assembly of claim 1, further comprising:

the second insulation framework is formed on the second end face and provided with a plurality of third arc-shaped sheets which extend and protrude out of the second end face, and at least one of the third arc-shaped sheets is provided with a second reference positioning feature.

3. The stator assembly of claim 2, wherein the stator core, the first insulating skeleton, and the second insulating skeleton are integrally injection molded, and the stator core is hollowed with a plurality of slots to increase contact surface areas of the first insulating skeleton and the second insulating skeleton with the stator core.

4. The stator assembly of claim 2, wherein the first and second reference locating features are not aligned with each other in an axial direction of the stator core.

5. The stator assembly of claim 2, wherein the plurality of first arcuate pieces and the plurality of second arcuate pieces are alternately arranged with each other, a gap between adjacent ones of the first arcuate pieces and the second arcuate pieces forms a first wire-arranging groove, a gap between adjacent ones of the third arcuate pieces forms a second wire-arranging groove, and the first wire-arranging groove and the second wire-arranging groove are not aligned with each other in an axial direction of the stator core.

6. The stator assembly of claim 5, wherein the plurality of first arcuate pieces are shorter in length and the plurality of second arcuate pieces are longer in length in an axial direction of the stator core; and in the radial direction of the stator core, the plurality of first arc-shaped sheets have a larger thickness than the plurality of second arc-shaped sheets.

7. The stator assembly of claim 5, wherein the first reference locating feature is located on a sidewall of at least one of the plurality of first arcuate tabs and the first reference locating feature and the second reference locating feature are grooves.

8. The stator assembly of claim 1, wherein the plurality of conductive terminals comprises:

a plurality of positive conductive terminals having a lower half and an upper half, the upper half extending upwardly from a top edge of the lower half; the upper half part is provided with a top end and two shoulders; the lower half part is provided with a first terminal hook and two first embedded feet; and

a plurality of negative conductive terminals, which are provided with a second terminal hook and two second embedded pins;

wherein in the axial direction of the stator core, the lengths of the positive conductive terminals are longer, and the lengths of the negative conductive terminals are shorter.

9. The stator assembly of claim 8, further comprising a circuit board, the tips of the plurality of positive conductive terminals being configured to be inserted into corresponding connection holes of the circuit board, the two shoulders of the plurality of positive conductive terminals being configured to carry the circuit board.

10. The stator assembly of claim 8, wherein at least one of the plurality of first arcuate pieces has two slots formed therein, the two first embedded feet of the plurality of positive conductive terminals or the two second embedded feet of the plurality of negative conductive terminals being embedded in the two slots of the plurality of first arcuate pieces.

11. The stator assembly of claim 8, further comprising:

a plurality of coils wound in the stator core and extending out of a plurality of connecting wires wound on the first insulating framework;

the first terminal hooks are used for arranging wires and integrating wire heads of the plurality of connecting wires corresponding to the plurality of positive conductive terminals, so that the plurality of positive conductive terminals and the wire heads of the plurality of connecting wires corresponding to the plurality of positive conductive terminals are electrically connected with each other;

the second terminal hooks are used for arranging wires and integrally welding wire ends of the plurality of connecting wires corresponding to the plurality of negative conductive terminals, so that the plurality of negative conductive terminals and the wire ends of the plurality of connecting wires corresponding to the plurality of negative conductive terminals are electrically connected with each other.

12. A method of manufacturing a stator assembly, comprising:

integrally encapsulating and molding a first insulating framework and a stator core, and forming a first reference positioning feature in the first insulating framework;

embedding a plurality of positive conductive terminals and a plurality of negative conductive terminals into the first insulating skeleton according to the position of the first reference positioning feature;

sequentially winding a plurality of coils in the stator core and extending a plurality of connecting wires according to the positions of the first reference positioning features;

welding wire ends of the plurality of connecting wires to the corresponding plurality of positive conductive terminals and the plurality of negative conductive terminals; and

and penetrating the positive conductive terminals into the circuit board.

13. The manufacturing method according to claim 12, further comprising:

integrally encapsulating the first insulating skeleton, the second insulating skeleton and the stator core, and forming a second reference positioning feature in the second insulating skeleton;

embedding the plurality of positive conductive terminals and the plurality of negative conductive terminals into the first insulating skeleton according to the positions of the first reference positioning feature and the second reference positioning feature; and

and sequentially winding the coils in the stator core and extending the connecting wires according to the positions of the first reference positioning feature and the second reference positioning feature.

14. The manufacturing method according to claim 12, wherein the plurality of coils includes three U-phase coils, three V-phase coils, and three W-phase coils, and at least one of the following structures is satisfied:

the windings between at least two of the plurality of U-phase coils are continuous windings;

the windings between at least two of the plurality of V-phase coils are continuous windings; and

the windings between at least two of the plurality of W-phase coils are continuous windings.

15. The manufacturing method according to claim 13, further comprising:

the stator core is dug to form a plurality of slots so as to increase the contact surface areas of the first insulating framework and the second insulating framework with the stator core.

16. The method of manufacturing of claim 13, wherein the first insulating skeleton has a plurality of first arcuate sheets and a plurality of second arcuate sheets, the second insulating skeleton has a plurality of third arcuate sheets, the first reference locating feature is a groove of the plurality of first arcuate sheets, and the second reference locating feature is a groove of the plurality of third arcuate sheets.

17. The manufacturing method according to claim 13, wherein at least one of the plurality of first arc pieces has two slots formed therein, the step of embedding the plurality of positive conductive terminals and the plurality of negative conductive terminals into the first insulating skeleton comprising:

and embedding two first embedded pins of the positive conductive terminals and two second embedded pins of the negative conductive terminals into the two slots of the second arc-shaped pieces.

18. The method of manufacturing of claim 12, wherein the plurality of positive conductive terminals have a top end and two shoulders, the step of threading the plurality of positive conductive terminals through the circuit board comprising:

and inserting the top ends of the positive conductive terminals into corresponding connecting holes of the circuit board, so that the two shoulders of the positive conductive terminals bear the circuit board.

19. A winding method for the stator assembly of claim 1, for winding three U-phase coils, three V-phase coils, and three W-phase coils on three U-phase, three V-phase, and three W-phase winding slots of the stator core, one of the three U, V, W-phase winding slots respectively constituting a first group, a second group, and a third group, the winding method comprising:

judging the position of the U-phase wire winding groove of the first group according to the position of the first reference positioning feature;

in a line-to-bottom manner, in sequence

(1) A U-phase coil is wound in the U-phase winding groove of the first group;

(2) Winding a V-phase coil on the winding grooves of the V-phase of the first group;

(3) Winding a V-phase coil on the winding groove of the V-phase of the second group;

(4) A U-phase coil is wound on the winding groove of the U-phase of the second group;

(5) A U-phase coil is wound on the winding groove of the U-phase of the third group;

(6) A W phase coil is wound on the winding groove of the W phase of the second group;

(7) A W phase coil is wound on the winding grooves of the W phase of the first group;

(8) A V-phase coil is wound in the winding groove of the V-phase to the third group; and

(9) And winding the W phase coil to the winding groove of the W phase of the third group.

20. The winding method of claim 19, further comprising:

cutting a connecting wire connecting the W-phase coils of the first group and the V-phase coils of the third group, and welding the wire ends of the W-phase coils of the first group to the connecting wire connecting the U, V-phase coils of the first group; and

cutting the connecting wire connecting the W phase coils of the second group and the U phase coils of the third group, welding the wire ends of the W phase coils of the second group to the connecting wire connecting the U, V phase coils of the second group, and welding the wire ends of the U phase coils of the third group to the connecting wire connecting the V, W phase coils of the third group.